diff --git a/bundles/bundle-all.js b/bundles/bundle-all.js
index 7d50e50..ec39aa8 100644
--- a/bundles/bundle-all.js
+++ b/bundles/bundle-all.js
@@ -21,7 +21,7 @@ import '../node_modules/webcomponents-platform/webcomponents-platform.js'
 //------ template ------
 import '../node_modules/@webcomponents/template/template.js'
 //------ es6-promise ------
-import '../node_modules/es6-promise/dist/es6-promise.auto.min.js'
+import '../node_modules/es6-promise/lib/es6-promise.auto.js'
 //------ pre-polyfill ------
 import '../node_modules/webcomponents.js/src/pre-polyfill.js'
 //------ shadydom ------
diff --git a/dist/web-component-polyfills.js b/dist/web-component-polyfills.js
index 0448a4b..468f7a3 100644
--- a/dist/web-component-polyfills.js
+++ b/dist/web-component-polyfills.js
@@ -130,28 +130,108 @@
 
 // minimal template polyfill
 (function () {
+  'use strict';
 
   var needsTemplate = typeof HTMLTemplateElement === 'undefined';
+  var brokenDocFragment = !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment);
+  var needsDocFrag = false;
 
-  // NOTE: Patch document.importNode to work around IE11 bug that
-  // casues children of a document fragment imported while
-  // there is a mutation observer to not have a parentNode (!?!)
-  // It's important that this is the first patch to `importNode` so that
-  // dom produced for later patches is correct.
+  // NOTE: Replace DocumentFragment to work around IE11 bug that
+  // casues children of a document fragment modified while
+  // there is a mutation observer to not have a parentNode, or
+  // have a broken parentNode (!?!)
   if (/Trident/.test(navigator.userAgent)) {
     (function () {
-      var Native_importNode = Document.prototype.importNode;
-      Document.prototype.importNode = function () {
-        var n = Native_importNode.apply(this, arguments);
-        // Copy all children to a new document fragment since
-        // this one may be broken
-        if (n.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
-          var f = this.createDocumentFragment();
-          f.appendChild(n);
-          return f;
+
+      needsDocFrag = true;
+
+      var origCloneNode = Node.prototype.cloneNode;
+      Node.prototype.cloneNode = function cloneNode(deep) {
+        var newDom = origCloneNode.call(this, deep);
+        if (this instanceof DocumentFragment) {
+          newDom.__proto__ = DocumentFragment.prototype;
+        }
+        return newDom;
+      };
+
+      // IE's DocumentFragment querySelector code doesn't work when
+      // called on an element instance
+      DocumentFragment.prototype.querySelectorAll = HTMLElement.prototype.querySelectorAll;
+      DocumentFragment.prototype.querySelector = HTMLElement.prototype.querySelector;
+
+      Object.defineProperties(DocumentFragment.prototype, {
+        'nodeType': {
+          get: function get() {
+            return Node.DOCUMENT_FRAGMENT_NODE;
+          },
+          configurable: true
+        },
+
+        'localName': {
+          get: function get() {
+            return undefined;
+          },
+          configurable: true
+        },
+
+        'nodeName': {
+          get: function get() {
+            return '#document-fragment';
+          },
+          configurable: true
+        }
+      });
+
+      var origInsertBefore = Node.prototype.insertBefore;
+      function insertBefore(newNode, refNode) {
+        if (newNode instanceof DocumentFragment) {
+          var child;
+          while (child = newNode.firstChild) {
+            origInsertBefore.call(this, child, refNode);
+          }
+        } else {
+          origInsertBefore.call(this, newNode, refNode);
+        }
+        return newNode;
+      }
+      Node.prototype.insertBefore = insertBefore;
+
+      var origAppendChild = Node.prototype.appendChild;
+      Node.prototype.appendChild = function appendChild(child) {
+        if (child instanceof DocumentFragment) {
+          insertBefore.call(this, child, null);
+        } else {
+          origAppendChild.call(this, child);
+        }
+        return child;
+      };
+
+      var origRemoveChild = Node.prototype.removeChild;
+      var origReplaceChild = Node.prototype.replaceChild;
+      Node.prototype.replaceChild = function replaceChild(newChild, oldChild) {
+        if (newChild instanceof DocumentFragment) {
+          insertBefore.call(this, newChild, oldChild);
+          origRemoveChild.call(this, oldChild);
         } else {
-          return n;
+          origReplaceChild.call(this, newChild, oldChild);
+        }
+        return oldChild;
+      };
+
+      Document.prototype.createDocumentFragment = function createDocumentFragment() {
+        var frag = this.createElement('df');
+        frag.__proto__ = DocumentFragment.prototype;
+        return frag;
+      };
+
+      var origImportNode = Document.prototype.importNode;
+      Document.prototype.importNode = function importNode(impNode, deep) {
+        deep = deep || false;
+        var newNode = origImportNode.call(this, impNode, deep);
+        if (impNode instanceof DocumentFragment) {
+          newNode.__proto__ = DocumentFragment.prototype;
         }
+        return newNode;
       };
     })();
   }
@@ -160,9 +240,33 @@
   // This means this polyfill must load before the CE polyfill and
   // this would need to be re-worked if a browser supports native CE
   // but not <template>.
-  var Native_cloneNode = Node.prototype.cloneNode;
-  var Native_createElement = Document.prototype.createElement;
-  var Native_importNode = Document.prototype.importNode;
+  var capturedCloneNode = Node.prototype.cloneNode;
+  var capturedCreateElement = Document.prototype.createElement;
+  var capturedImportNode = Document.prototype.importNode;
+  var capturedRemoveChild = Node.prototype.removeChild;
+  var capturedAppendChild = Node.prototype.appendChild;
+  var capturedReplaceChild = Node.prototype.replaceChild;
+
+  var elementQuerySelectorAll = Element.prototype.querySelectorAll;
+  var docQuerySelectorAll = Document.prototype.querySelectorAll;
+  var fragQuerySelectorAll = DocumentFragment.prototype.querySelectorAll;
+
+  var scriptSelector = 'script:not([type]),script[type="application/javascript"],script[type="text/javascript"]';
+
+  function QSA(node, selector) {
+    // IE 11 throws a SyntaxError with `scriptSelector` if the node has no children due to the `:not([type])` syntax
+    if (!node.childNodes.length) {
+      return [];
+    }
+    switch (node.nodeType) {
+      case Node.DOCUMENT_NODE:
+        return docQuerySelectorAll.call(node, selector);
+      case Node.DOCUMENT_FRAGMENT_NODE:
+        return fragQuerySelectorAll.call(node, selector);
+      default:
+        return elementQuerySelectorAll.call(node, selector);
+    }
+  }
 
   // returns true if nested templates cannot be cloned (they cannot be on
   // some impl's like Safari 8 and Edge)
@@ -174,7 +278,7 @@
       t2.content.appendChild(document.createElement('div'));
       t.content.appendChild(t2);
       var clone = t.cloneNode(true);
-      return clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0 || !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment);
+      return clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0 || brokenDocFragment;
     }
   }();
 
@@ -182,45 +286,6 @@
   var PolyfilledHTMLTemplateElement = function PolyfilledHTMLTemplateElement() {};
 
   if (needsTemplate) {
-    var defineInnerHTML = function defineInnerHTML(obj) {
-      Object.defineProperty(obj, 'innerHTML', {
-        get: function get() {
-          var o = '';
-          for (var e = this.content.firstChild; e; e = e.nextSibling) {
-            o += e.outerHTML || escapeData(e.data);
-          }
-          return o;
-        },
-        set: function set(text) {
-          contentDoc.body.innerHTML = text;
-          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);
-          while (this.content.firstChild) {
-            this.content.removeChild(this.content.firstChild);
-          }
-          while (contentDoc.body.firstChild) {
-            this.content.appendChild(contentDoc.body.firstChild);
-          }
-        },
-        configurable: true
-      });
-    };
-
-    var escapeReplace = function escapeReplace(c) {
-      switch (c) {
-        case '&':
-          return '&amp;';
-        case '<':
-          return '&lt;';
-        case '>':
-          return '&gt;';
-        case '\xA0':
-          return '&nbsp;';
-      }
-    };
-
-    var escapeData = function escapeData(s) {
-      return s.replace(escapeDataRegExp, escapeReplace);
-    };
 
     var contentDoc = document.implementation.createHTMLDocument('template');
     var canDecorate = true;
@@ -252,7 +317,7 @@
       template.content = contentDoc.createDocumentFragment();
       var child;
       while (child = template.firstChild) {
-        template.content.appendChild(child);
+        capturedAppendChild.call(template.content, child);
       }
       // NOTE: prefer prototype patching for performance and
       // because on some browsers (IE11), re-defining `innerHTML`
@@ -268,6 +333,7 @@
         if (canDecorate) {
           try {
             defineInnerHTML(template);
+            defineOuterHTML(template);
           } catch (err) {
             canDecorate = false;
           }
@@ -277,14 +343,59 @@
       PolyfilledHTMLTemplateElement.bootstrap(template.content);
     };
 
+    var defineInnerHTML = function defineInnerHTML(obj) {
+      Object.defineProperty(obj, 'innerHTML', {
+        get: function get() {
+          var o = '';
+          for (var e = this.content.firstChild; e; e = e.nextSibling) {
+            o += e.outerHTML || escapeData(e.data);
+          }
+          return o;
+        },
+        set: function set(text) {
+          contentDoc.body.innerHTML = text;
+          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);
+          while (this.content.firstChild) {
+            capturedRemoveChild.call(this.content, this.content.firstChild);
+          }
+          while (contentDoc.body.firstChild) {
+            capturedAppendChild.call(this.content, contentDoc.body.firstChild);
+          }
+        },
+        configurable: true
+      });
+    };
+
+    var defineOuterHTML = function defineOuterHTML(obj) {
+      Object.defineProperty(obj, 'outerHTML', {
+        get: function get() {
+          return '<' + TEMPLATE_TAG + '>' + this.innerHTML + '</' + TEMPLATE_TAG + '>';
+        },
+        set: function set(innerHTML) {
+          if (this.parentNode) {
+            contentDoc.body.innerHTML = innerHTML;
+            var docFrag = this.ownerDocument.createDocumentFragment();
+            while (contentDoc.body.firstChild) {
+              capturedAppendChild.call(docFrag, contentDoc.body.firstChild);
+            }
+            capturedReplaceChild.call(this.parentNode, docFrag, this);
+          } else {
+            throw new Error("Failed to set the 'outerHTML' property on 'Element': This element has no parent node.");
+          }
+        },
+        configurable: true
+      });
+    };
+
     defineInnerHTML(PolyfilledHTMLTemplateElement.prototype);
+    defineOuterHTML(PolyfilledHTMLTemplateElement.prototype);
 
     /**
       The `bootstrap` method is called automatically and "fixes" all
       <template> elements in the document referenced by the `doc` argument.
     */
-    PolyfilledHTMLTemplateElement.bootstrap = function (doc) {
-      var templates = doc.querySelectorAll(TEMPLATE_TAG);
+    PolyfilledHTMLTemplateElement.bootstrap = function bootstrap(doc) {
+      var templates = QSA(doc, TEMPLATE_TAG);
       for (var i = 0, l = templates.length, t; i < l && (t = templates[i]); i++) {
         PolyfilledHTMLTemplateElement.decorate(t);
       }
@@ -296,10 +407,8 @@
     });
 
     // Patch document.createElement to ensure newly created templates have content
-    Document.prototype.createElement = function () {
-      'use strict';
-
-      var el = Native_createElement.apply(this, arguments);
+    Document.prototype.createElement = function createElement() {
+      var el = capturedCreateElement.apply(this, arguments);
       if (el.localName === 'template') {
         PolyfilledHTMLTemplateElement.decorate(el);
       }
@@ -307,13 +416,30 @@
     };
 
     var escapeDataRegExp = /[&\u00A0<>]/g;
+
+    var escapeReplace = function escapeReplace(c) {
+      switch (c) {
+        case '&':
+          return '&amp;';
+        case '<':
+          return '&lt;';
+        case '>':
+          return '&gt;';
+        case '\xA0':
+          return '&nbsp;';
+      }
+    };
+
+    var escapeData = function escapeData(s) {
+      return s.replace(escapeDataRegExp, escapeReplace);
+    };
   }
 
   // make cloning/importing work!
   if (needsTemplate || needsCloning) {
 
-    PolyfilledHTMLTemplateElement._cloneNode = function (template, deep) {
-      var clone = Native_cloneNode.call(template, false);
+    PolyfilledHTMLTemplateElement._cloneNode = function _cloneNode(template, deep) {
+      var clone = capturedCloneNode.call(template, false);
       // NOTE: decorate doesn't auto-fix children because they are already
       // decorated so they need special clone fixup.
       if (this.decorate) {
@@ -322,54 +448,71 @@
       if (deep) {
         // NOTE: use native clone node to make sure CE's wrapped
         // cloneNode does not cause elements to upgrade.
-        clone.content.appendChild(Native_cloneNode.call(template.content, true));
+        capturedAppendChild.call(clone.content, capturedCloneNode.call(template.content, true));
         // now ensure nested templates are cloned correctly.
-        this.fixClonedDom(clone.content, template.content);
+        fixClonedDom(clone.content, template.content);
       }
       return clone;
     };
 
-    PolyfilledHTMLTemplateElement.prototype.cloneNode = function (deep) {
-      return PolyfilledHTMLTemplateElement._cloneNode(this, deep);
-    };
-
     // Given a source and cloned subtree, find <template>'s in the cloned
     // subtree and replace them with cloned <template>'s from source.
     // We must do this because only the source templates have proper .content.
-    PolyfilledHTMLTemplateElement.fixClonedDom = function (clone, source) {
+    var fixClonedDom = function fixClonedDom(clone, source) {
       // do nothing if cloned node is not an element
       if (!source.querySelectorAll) return;
       // these two lists should be coincident
-      var s$ = source.querySelectorAll(TEMPLATE_TAG);
-      var t$ = clone.querySelectorAll(TEMPLATE_TAG);
+      var s$ = QSA(source, TEMPLATE_TAG);
+      if (s$.length === 0) {
+        return;
+      }
+      var t$ = QSA(clone, TEMPLATE_TAG);
       for (var i = 0, l = t$.length, t, s; i < l; i++) {
         s = s$[i];
         t = t$[i];
-        if (this.decorate) {
-          this.decorate(s);
+        if (PolyfilledHTMLTemplateElement && PolyfilledHTMLTemplateElement.decorate) {
+          PolyfilledHTMLTemplateElement.decorate(s);
+        }
+        capturedReplaceChild.call(t.parentNode, cloneNode.call(s, true), t);
+      }
+    };
+
+    // make sure scripts inside of a cloned template are executable
+    var fixClonedScripts = function fixClonedScripts(fragment) {
+      var scripts = QSA(fragment, scriptSelector);
+      for (var ns, s, i = 0; i < scripts.length; i++) {
+        s = scripts[i];
+        ns = capturedCreateElement.call(document, 'script');
+        ns.textContent = s.textContent;
+        var attrs = s.attributes;
+        for (var ai = 0, a; ai < attrs.length; ai++) {
+          a = attrs[ai];
+          ns.setAttribute(a.name, a.value);
         }
-        t.parentNode.replaceChild(s.cloneNode(true), t);
+        capturedReplaceChild.call(s.parentNode, ns, s);
       }
     };
 
     // override all cloning to fix the cloned subtree to contain properly
     // cloned templates.
-    Node.prototype.cloneNode = function (deep) {
+    var cloneNode = Node.prototype.cloneNode = function cloneNode(deep) {
       var dom;
       // workaround for Edge bug cloning documentFragments
       // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8619646/
-      if (this instanceof DocumentFragment) {
+      if (!needsDocFrag && brokenDocFragment && this instanceof DocumentFragment) {
         if (!deep) {
           return this.ownerDocument.createDocumentFragment();
         } else {
-          dom = this.ownerDocument.importNode(this, true);
+          dom = importNode.call(this.ownerDocument, this, true);
         }
+      } else if (this.nodeType === Node.ELEMENT_NODE && this.localName === TEMPLATE_TAG) {
+        dom = PolyfilledHTMLTemplateElement._cloneNode(this, deep);
       } else {
-        dom = Native_cloneNode.call(this, deep);
+        dom = capturedCloneNode.call(this, deep);
       }
       // template.content is cloned iff `deep`.
       if (deep) {
-        PolyfilledHTMLTemplateElement.fixClonedDom(dom, this);
+        fixClonedDom(dom, this);
       }
       return dom;
     };
@@ -379,23 +522,19 @@
     // This is because the native import node creates the right document owned
     // subtree and `fixClonedDom` inserts cloned templates into this subtree,
     // thus updating the owner doc.
-    Document.prototype.importNode = function (element, deep) {
+    var importNode = Document.prototype.importNode = function importNode(element, deep) {
+      deep = deep || false;
       if (element.localName === TEMPLATE_TAG) {
         return PolyfilledHTMLTemplateElement._cloneNode(element, deep);
       } else {
-        var dom = Native_importNode.call(this, element, deep);
+        var dom = capturedImportNode.call(this, element, deep);
         if (deep) {
-          PolyfilledHTMLTemplateElement.fixClonedDom(dom, element);
+          fixClonedDom(dom, element);
+          fixClonedScripts(dom);
         }
         return dom;
       }
     };
-
-    if (needsCloning) {
-      window.HTMLTemplateElement.prototype.cloneNode = function (deep) {
-        return PolyfilledHTMLTemplateElement._cloneNode(this, deep);
-      };
-    }
   }
 
   if (needsTemplate) {
@@ -443,222 +582,1227 @@ var createClass = function () {
   };
 }();
 
-!function (t, e) {
-  "object" == (typeof exports === "undefined" ? "undefined" : _typeof(exports)) && "undefined" != typeof module ? module.exports = e() : "function" == typeof define && define.amd ? define(e) : t.ES6Promise = e();
-}(window, function () {
-  "use strict";
-  function t(t) {
-    var e = typeof t === "undefined" ? "undefined" : _typeof(t);return null !== t && ("object" === e || "function" === e);
-  }function e(t) {
-    return "function" == typeof t;
-  }function n(t) {
-    I = t;
-  }function r(t) {
-    J = t;
-  }function o() {
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+var toConsumableArray = function (arr) {
+  if (Array.isArray(arr)) {
+    for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];
+
+    return arr2;
+  } else {
+    return Array.from(arr);
+  }
+};
+
+function objectOrFunction(x) {
+  var type = typeof x === 'undefined' ? 'undefined' : _typeof(x);
+  return x !== null && (type === 'object' || type === 'function');
+}
+
+function isFunction(x) {
+  return typeof x === 'function';
+}
+
+
+
+var _isArray = void 0;
+if (Array.isArray) {
+  _isArray = Array.isArray;
+} else {
+  _isArray = function _isArray(x) {
+    return Object.prototype.toString.call(x) === '[object Array]';
+  };
+}
+
+var isArray = _isArray;
+
+var len = 0;
+var vertxNext = void 0;
+var customSchedulerFn = void 0;
+
+var asap = function asap(callback, arg) {
+  queue[len] = callback;
+  queue[len + 1] = arg;
+  len += 2;
+  if (len === 2) {
+    // If len is 2, that means that we need to schedule an async flush.
+    // If additional callbacks are queued before the queue is flushed, they
+    // will be processed by this flush that we are scheduling.
+    if (customSchedulerFn) {
+      customSchedulerFn(flush);
+    } else {
+      scheduleFlush();
+    }
+  }
+};
+
+function setScheduler(scheduleFn) {
+  customSchedulerFn = scheduleFn;
+}
+
+function setAsap(asapFn) {
+  asap = asapFn;
+}
+
+var browserWindow = typeof window !== 'undefined' ? window : undefined;
+var browserGlobal = browserWindow || {};
+var BrowserMutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver;
+var isNode = typeof self === 'undefined' && typeof process !== 'undefined' && {}.toString.call(process) === '[object process]';
+
+// test for web worker but not in IE10
+var isWorker = typeof Uint8ClampedArray !== 'undefined' && typeof importScripts !== 'undefined' && typeof MessageChannel !== 'undefined';
+
+// node
+function useNextTick() {
+  // node version 0.10.x displays a deprecation warning when nextTick is used recursively
+  // see https://github.com/cujojs/when/issues/410 for details
+  return function () {
+    return process.nextTick(flush);
+  };
+}
+
+// vertx
+function useVertxTimer() {
+  if (typeof vertxNext !== 'undefined') {
     return function () {
-      return process.nextTick(a);
-    };
-  }function i() {
-    return "undefined" != typeof H ? function () {
-      H(a);
-    } : c();
-  }function s() {
-    var t = 0,
-        e = new V(a),
-        n = document.createTextNode("");return e.observe(n, { characterData: !0 }), function () {
-      n.data = t = ++t % 2;
+      vertxNext(flush);
     };
-  }function u() {
-    var t = new MessageChannel();return t.port1.onmessage = a, function () {
-      return t.port2.postMessage(0);
-    };
-  }function c() {
-    var t = setTimeout;return function () {
-      return t(a, 1);
-    };
-  }function a() {
-    for (var t = 0; t < G; t += 2) {
-      var e = $[t],
-          n = $[t + 1];e(n), $[t] = void 0, $[t + 1] = void 0;
-    }G = 0;
-  }function f() {
-    try {
-      var t = require,
-          e = t("vertx");return H = e.runOnLoop || e.runOnContext, i();
-    } catch (n) {
-      return c();
-    }
-  }function l(t, e) {
-    var n = arguments,
-        r = this,
-        o = new this.constructor(p);void 0 === o[et] && k(o);var i = r._state;return i ? !function () {
-      var t = n[i - 1];J(function () {
-        return x(i, o, t, r._result);
-      });
-    }() : E(r, o, t, e), o;
-  }function h(t) {
-    var e = this;if (t && "object" == (typeof t === "undefined" ? "undefined" : _typeof(t)) && t.constructor === e) return t;var n = new e(p);return g(n, t), n;
-  }function p() {}function v() {
-    return new TypeError("You cannot resolve a promise with itself");
-  }function d() {
-    return new TypeError("A promises callback cannot return that same promise.");
-  }function _(t) {
-    try {
-      return t.then;
-    } catch (e) {
-      return it.error = e, it;
-    }
-  }function y(t, e, n, r) {
-    try {
-      t.call(e, n, r);
-    } catch (o) {
-      return o;
-    }
-  }function m(t, e, n) {
-    J(function (t) {
-      var r = !1,
-          o = y(n, e, function (n) {
-        r || (r = !0, e !== n ? g(t, n) : S(t, n));
-      }, function (e) {
-        r || (r = !0, j(t, e));
-      }, "Settle: " + (t._label || " unknown promise"));!r && o && (r = !0, j(t, o));
-    }, t);
-  }function b(t, e) {
-    e._state === rt ? S(t, e._result) : e._state === ot ? j(t, e._result) : E(e, void 0, function (e) {
-      return g(t, e);
-    }, function (e) {
-      return j(t, e);
-    });
-  }function w(t, n, r) {
-    n.constructor === t.constructor && r === l && n.constructor.resolve === h ? b(t, n) : r === it ? (j(t, it.error), it.error = null) : void 0 === r ? S(t, n) : e(r) ? m(t, n, r) : S(t, n);
-  }function g(e, n) {
-    e === n ? j(e, v()) : t(n) ? w(e, n, _(n)) : S(e, n);
-  }function A(t) {
-    t._onerror && t._onerror(t._result), T(t);
-  }function S(t, e) {
-    t._state === nt && (t._result = e, t._state = rt, 0 !== t._subscribers.length && J(T, t));
-  }function j(t, e) {
-    t._state === nt && (t._state = ot, t._result = e, J(A, t));
-  }function E(t, e, n, r) {
-    var o = t._subscribers,
-        i = o.length;t._onerror = null, o[i] = e, o[i + rt] = n, o[i + ot] = r, 0 === i && t._state && J(T, t);
-  }function T(t) {
-    var e = t._subscribers,
-        n = t._state;if (0 !== e.length) {
-      for (var r = void 0, o = void 0, i = t._result, s = 0; s < e.length; s += 3) {
-        r = e[s], o = e[s + n], r ? x(n, r, o, i) : o(i);
-      }t._subscribers.length = 0;
-    }
-  }function M() {
-    this.error = null;
-  }function P(t, e) {
-    try {
-      return t(e);
-    } catch (n) {
-      return st.error = n, st;
-    }
-  }function x(t, n, r, o) {
-    var i = e(r),
-        s = void 0,
-        u = void 0,
-        c = void 0,
-        a = void 0;if (i) {
-      if (s = P(r, o), s === st ? (a = !0, u = s.error, s.error = null) : c = !0, n === s) return void j(n, d());
-    } else s = o, c = !0;n._state !== nt || (i && c ? g(n, s) : a ? j(n, u) : t === rt ? S(n, s) : t === ot && j(n, s));
-  }function C(t, e) {
-    try {
-      e(function (e) {
-        g(t, e);
-      }, function (e) {
-        j(t, e);
-      });
-    } catch (n) {
-      j(t, n);
-    }
-  }function O() {
-    return ut++;
-  }function k(t) {
-    t[et] = ut++, t._state = void 0, t._result = void 0, t._subscribers = [];
-  }function Y(t, e) {
-    this._instanceConstructor = t, this.promise = new t(p), this.promise[et] || k(this.promise), B(e) ? (this.length = e.length, this._remaining = e.length, this._result = new Array(this.length), 0 === this.length ? S(this.promise, this._result) : (this.length = this.length || 0, this._enumerate(e), 0 === this._remaining && S(this.promise, this._result))) : j(this.promise, q());
-  }function q() {
-    return new Error("Array Methods must be provided an Array");
-  }function F(t) {
-    return new Y(this, t).promise;
-  }function D(t) {
-    var e = this;return new e(B(t) ? function (n, r) {
-      for (var o = t.length, i = 0; i < o; i++) {
-        e.resolve(t[i]).then(n, r);
-      }
-    } : function (t, e) {
-      return e(new TypeError("You must pass an array to race."));
-    });
-  }function K(t) {
-    var e = this,
-        n = new e(p);return j(n, t), n;
-  }function L() {
-    throw new TypeError("You must pass a resolver function as the first argument to the promise constructor");
-  }function N() {
-    throw new TypeError("Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function.");
-  }function U(t) {
-    this[et] = O(), this._result = this._state = void 0, this._subscribers = [], p !== t && ("function" != typeof t && L(), this instanceof U ? C(this, t) : N());
-  }function W() {
-    var t = void 0;if ("undefined" != typeof global) t = global;else if ("undefined" != typeof self) t = self;else try {
-      t = Function("return this")();
-    } catch (e) {
-      throw new Error("polyfill failed because global object is unavailable in this environment");
-    }var n = t.Promise;if (n) {
-      var r = null;try {
-        r = Object.prototype.toString.call(n.resolve());
-      } catch (e) {}if ("[object Promise]" === r && !n.cast) return;
-    }t.Promise = U;
-  }var z = void 0;z = Array.isArray ? Array.isArray : function (t) {
-    return "[object Array]" === Object.prototype.toString.call(t);
-  };var B = z,
-      G = 0,
-      H = void 0,
-      I = void 0,
-      J = function J(t, e) {
-    $[G] = t, $[G + 1] = e, G += 2, 2 === G && (I ? I(a) : tt());
-  },
-      Q = "undefined" != typeof window ? window : void 0,
-      R = Q || {},
-      V = R.MutationObserver || R.WebKitMutationObserver,
-      X = "undefined" == typeof self && "undefined" != typeof process && "[object process]" === {}.toString.call(process),
-      Z = "undefined" != typeof Uint8ClampedArray && "undefined" != typeof importScripts && "undefined" != typeof MessageChannel,
-      $ = new Array(1e3),
-      tt = void 0;tt = X ? o() : V ? s() : Z ? u() : void 0 === Q && "function" == typeof require ? f() : c();var et = Math.random().toString(36).substring(16),
-      nt = void 0,
-      rt = 1,
-      ot = 2,
-      it = new M(),
-      st = new M(),
-      ut = 0;return Y.prototype._enumerate = function (t) {
-    for (var e = 0; this._state === nt && e < t.length; e++) {
-      this._eachEntry(t[e], e);
-    }
-  }, Y.prototype._eachEntry = function (t, e) {
-    var n = this._instanceConstructor,
-        r = n.resolve;if (r === h) {
-      var o = _(t);if (o === l && t._state !== nt) this._settledAt(t._state, e, t._result);else if ("function" != typeof o) this._remaining--, this._result[e] = t;else if (n === U) {
-        var i = new n(p);w(i, t, o), this._willSettleAt(i, e);
-      } else this._willSettleAt(new n(function (e) {
-        return e(t);
-      }), e);
-    } else this._willSettleAt(r(t), e);
-  }, Y.prototype._settledAt = function (t, e, n) {
-    var r = this.promise;r._state === nt && (this._remaining--, t === ot ? j(r, n) : this._result[e] = n), 0 === this._remaining && S(r, this._result);
-  }, Y.prototype._willSettleAt = function (t, e) {
-    var n = this;E(t, void 0, function (t) {
-      return n._settledAt(rt, e, t);
-    }, function (t) {
-      return n._settledAt(ot, e, t);
+  }
+
+  return useSetTimeout();
+}
+
+function useMutationObserver() {
+  var iterations = 0;
+  var observer = new BrowserMutationObserver(flush);
+  var node = document.createTextNode('');
+  observer.observe(node, { characterData: true });
+
+  return function () {
+    node.data = iterations = ++iterations % 2;
+  };
+}
+
+// web worker
+function useMessageChannel() {
+  var channel = new MessageChannel();
+  channel.port1.onmessage = flush;
+  return function () {
+    return channel.port2.postMessage(0);
+  };
+}
+
+function useSetTimeout() {
+  // Store setTimeout reference so es6-promise will be unaffected by
+  // other code modifying setTimeout (like sinon.useFakeTimers())
+  var globalSetTimeout = setTimeout;
+  return function () {
+    return globalSetTimeout(flush, 1);
+  };
+}
+
+var queue = new Array(1000);
+function flush() {
+  for (var i = 0; i < len; i += 2) {
+    var callback = queue[i];
+    var arg = queue[i + 1];
+
+    callback(arg);
+
+    queue[i] = undefined;
+    queue[i + 1] = undefined;
+  }
+
+  len = 0;
+}
+
+function attemptVertx() {
+  try {
+    var vertx = Function('return this')().require('vertx');
+    vertxNext = vertx.runOnLoop || vertx.runOnContext;
+    return useVertxTimer();
+  } catch (e) {
+    return useSetTimeout();
+  }
+}
+
+var scheduleFlush = void 0;
+// Decide what async method to use to triggering processing of queued callbacks:
+if (isNode) {
+  scheduleFlush = useNextTick();
+} else if (BrowserMutationObserver) {
+  scheduleFlush = useMutationObserver();
+} else if (isWorker) {
+  scheduleFlush = useMessageChannel();
+} else if (browserWindow === undefined && typeof require === 'function') {
+  scheduleFlush = attemptVertx();
+} else {
+  scheduleFlush = useSetTimeout();
+}
+
+function then(onFulfillment, onRejection) {
+  var parent = this;
+
+  var child = new this.constructor(noop);
+
+  if (child[PROMISE_ID] === undefined) {
+    makePromise(child);
+  }
+
+  var _state = parent._state;
+
+
+  if (_state) {
+    var callback = arguments[_state - 1];
+    asap(function () {
+      return invokeCallback(_state, child, callback, parent._result);
     });
-  }, U.all = F, U.race = D, U.resolve = h, U.reject = K, U._setScheduler = n, U._setAsap = r, U._asap = J, U.prototype = { constructor: U, then: l, "catch": function _catch(t) {
-      return this.then(null, t);
-    } }, U.polyfill = W, U.Promise = U, U.polyfill(), U;
-});
+  } else {
+    subscribe(parent, child, onFulfillment, onRejection);
+  }
+
+  return child;
+}
+
+/**
+  `Promise.resolve` returns a promise that will become resolved with the
+  passed `value`. It is shorthand for the following:
+
+  ```javascript
+  let promise = new Promise(function(resolve, reject){
+    resolve(1);
+  });
+
+  promise.then(function(value){
+    // value === 1
+  });
+  ```
+
+  Instead of writing the above, your code now simply becomes the following:
+
+  ```javascript
+  let promise = Promise.resolve(1);
+
+  promise.then(function(value){
+    // value === 1
+  });
+  ```
+
+  @method resolve
+  @static
+  @param {Any} value value that the returned promise will be resolved with
+  Useful for tooling.
+  @return {Promise} a promise that will become fulfilled with the given
+  `value`
+*/
+function resolve$1(object) {
+  /*jshint validthis:true */
+  var Constructor = this;
+
+  if (object && (typeof object === 'undefined' ? 'undefined' : _typeof(object)) === 'object' && object.constructor === Constructor) {
+    return object;
+  }
+
+  var promise = new Constructor(noop);
+  resolve(promise, object);
+  return promise;
+}
+
+var PROMISE_ID = Math.random().toString(36).substring(2);
+
+function noop() {}
+
+var PENDING = void 0;
+var FULFILLED = 1;
+var REJECTED = 2;
+
+var TRY_CATCH_ERROR = { error: null };
+
+function selfFulfillment() {
+  return new TypeError("You cannot resolve a promise with itself");
+}
+
+function cannotReturnOwn() {
+  return new TypeError('A promises callback cannot return that same promise.');
+}
+
+function getThen(promise) {
+  try {
+    return promise.then;
+  } catch (error) {
+    TRY_CATCH_ERROR.error = error;
+    return TRY_CATCH_ERROR;
+  }
+}
+
+function tryThen(then$$1, value, fulfillmentHandler, rejectionHandler) {
+  try {
+    then$$1.call(value, fulfillmentHandler, rejectionHandler);
+  } catch (e) {
+    return e;
+  }
+}
+
+function handleForeignThenable(promise, thenable, then$$1) {
+  asap(function (promise) {
+    var sealed = false;
+    var error = tryThen(then$$1, thenable, function (value) {
+      if (sealed) {
+        return;
+      }
+      sealed = true;
+      if (thenable !== value) {
+        resolve(promise, value);
+      } else {
+        fulfill(promise, value);
+      }
+    }, function (reason) {
+      if (sealed) {
+        return;
+      }
+      sealed = true;
+
+      reject(promise, reason);
+    }, 'Settle: ' + (promise._label || ' unknown promise'));
+
+    if (!sealed && error) {
+      sealed = true;
+      reject(promise, error);
+    }
+  }, promise);
+}
+
+function handleOwnThenable(promise, thenable) {
+  if (thenable._state === FULFILLED) {
+    fulfill(promise, thenable._result);
+  } else if (thenable._state === REJECTED) {
+    reject(promise, thenable._result);
+  } else {
+    subscribe(thenable, undefined, function (value) {
+      return resolve(promise, value);
+    }, function (reason) {
+      return reject(promise, reason);
+    });
+  }
+}
+
+function handleMaybeThenable(promise, maybeThenable, then$$1) {
+  if (maybeThenable.constructor === promise.constructor && then$$1 === then && maybeThenable.constructor.resolve === resolve$1) {
+    handleOwnThenable(promise, maybeThenable);
+  } else {
+    if (then$$1 === TRY_CATCH_ERROR) {
+      reject(promise, TRY_CATCH_ERROR.error);
+      TRY_CATCH_ERROR.error = null;
+    } else if (then$$1 === undefined) {
+      fulfill(promise, maybeThenable);
+    } else if (isFunction(then$$1)) {
+      handleForeignThenable(promise, maybeThenable, then$$1);
+    } else {
+      fulfill(promise, maybeThenable);
+    }
+  }
+}
+
+function resolve(promise, value) {
+  if (promise === value) {
+    reject(promise, selfFulfillment());
+  } else if (objectOrFunction(value)) {
+    handleMaybeThenable(promise, value, getThen(value));
+  } else {
+    fulfill(promise, value);
+  }
+}
+
+function publishRejection(promise) {
+  if (promise._onerror) {
+    promise._onerror(promise._result);
+  }
+
+  publish(promise);
+}
+
+function fulfill(promise, value) {
+  if (promise._state !== PENDING) {
+    return;
+  }
+
+  promise._result = value;
+  promise._state = FULFILLED;
+
+  if (promise._subscribers.length !== 0) {
+    asap(publish, promise);
+  }
+}
+
+function reject(promise, reason) {
+  if (promise._state !== PENDING) {
+    return;
+  }
+  promise._state = REJECTED;
+  promise._result = reason;
+
+  asap(publishRejection, promise);
+}
+
+function subscribe(parent, child, onFulfillment, onRejection) {
+  var _subscribers = parent._subscribers;
+  var length = _subscribers.length;
+
+
+  parent._onerror = null;
+
+  _subscribers[length] = child;
+  _subscribers[length + FULFILLED] = onFulfillment;
+  _subscribers[length + REJECTED] = onRejection;
+
+  if (length === 0 && parent._state) {
+    asap(publish, parent);
+  }
+}
+
+function publish(promise) {
+  var subscribers = promise._subscribers;
+  var settled = promise._state;
+
+  if (subscribers.length === 0) {
+    return;
+  }
+
+  var child = void 0,
+      callback = void 0,
+      detail = promise._result;
+
+  for (var i = 0; i < subscribers.length; i += 3) {
+    child = subscribers[i];
+    callback = subscribers[i + settled];
+
+    if (child) {
+      invokeCallback(settled, child, callback, detail);
+    } else {
+      callback(detail);
+    }
+  }
+
+  promise._subscribers.length = 0;
+}
+
+function tryCatch(callback, detail) {
+  try {
+    return callback(detail);
+  } catch (e) {
+    TRY_CATCH_ERROR.error = e;
+    return TRY_CATCH_ERROR;
+  }
+}
+
+function invokeCallback(settled, promise, callback, detail) {
+  var hasCallback = isFunction(callback),
+      value = void 0,
+      error = void 0,
+      succeeded = void 0,
+      failed = void 0;
+
+  if (hasCallback) {
+    value = tryCatch(callback, detail);
+
+    if (value === TRY_CATCH_ERROR) {
+      failed = true;
+      error = value.error;
+      value.error = null;
+    } else {
+      succeeded = true;
+    }
+
+    if (promise === value) {
+      reject(promise, cannotReturnOwn());
+      return;
+    }
+  } else {
+    value = detail;
+    succeeded = true;
+  }
+
+  if (promise._state !== PENDING) {
+    // noop
+  } else if (hasCallback && succeeded) {
+    resolve(promise, value);
+  } else if (failed) {
+    reject(promise, error);
+  } else if (settled === FULFILLED) {
+    fulfill(promise, value);
+  } else if (settled === REJECTED) {
+    reject(promise, value);
+  }
+}
+
+function initializePromise(promise, resolver) {
+  try {
+    resolver(function resolvePromise(value) {
+      resolve(promise, value);
+    }, function rejectPromise(reason) {
+      reject(promise, reason);
+    });
+  } catch (e) {
+    reject(promise, e);
+  }
+}
+
+var id = 0;
+function nextId() {
+  return id++;
+}
+
+function makePromise(promise) {
+  promise[PROMISE_ID] = id++;
+  promise._state = undefined;
+  promise._result = undefined;
+  promise._subscribers = [];
+}
+
+function validationError() {
+  return new Error('Array Methods must be provided an Array');
+}
+
+var Enumerator = function () {
+  function Enumerator(Constructor, input) {
+    classCallCheck(this, Enumerator);
+
+    this._instanceConstructor = Constructor;
+    this.promise = new Constructor(noop);
+
+    if (!this.promise[PROMISE_ID]) {
+      makePromise(this.promise);
+    }
+
+    if (isArray(input)) {
+      this.length = input.length;
+      this._remaining = input.length;
+
+      this._result = new Array(this.length);
+
+      if (this.length === 0) {
+        fulfill(this.promise, this._result);
+      } else {
+        this.length = this.length || 0;
+        this._enumerate(input);
+        if (this._remaining === 0) {
+          fulfill(this.promise, this._result);
+        }
+      }
+    } else {
+      reject(this.promise, validationError());
+    }
+  }
+
+  createClass(Enumerator, [{
+    key: '_enumerate',
+    value: function _enumerate(input) {
+      for (var i = 0; this._state === PENDING && i < input.length; i++) {
+        this._eachEntry(input[i], i);
+      }
+    }
+  }, {
+    key: '_eachEntry',
+    value: function _eachEntry(entry, i) {
+      var c = this._instanceConstructor;
+      var resolve$$1 = c.resolve;
+
+
+      if (resolve$$1 === resolve$1) {
+        var _then = getThen(entry);
+
+        if (_then === then && entry._state !== PENDING) {
+          this._settledAt(entry._state, i, entry._result);
+        } else if (typeof _then !== 'function') {
+          this._remaining--;
+          this._result[i] = entry;
+        } else if (c === Promise$3) {
+          var promise = new c(noop);
+          handleMaybeThenable(promise, entry, _then);
+          this._willSettleAt(promise, i);
+        } else {
+          this._willSettleAt(new c(function (resolve$$1) {
+            return resolve$$1(entry);
+          }), i);
+        }
+      } else {
+        this._willSettleAt(resolve$$1(entry), i);
+      }
+    }
+  }, {
+    key: '_settledAt',
+    value: function _settledAt(state, i, value) {
+      var promise = this.promise;
+
+
+      if (promise._state === PENDING) {
+        this._remaining--;
+
+        if (state === REJECTED) {
+          reject(promise, value);
+        } else {
+          this._result[i] = value;
+        }
+      }
+
+      if (this._remaining === 0) {
+        fulfill(promise, this._result);
+      }
+    }
+  }, {
+    key: '_willSettleAt',
+    value: function _willSettleAt(promise, i) {
+      var enumerator = this;
+
+      subscribe(promise, undefined, function (value) {
+        return enumerator._settledAt(FULFILLED, i, value);
+      }, function (reason) {
+        return enumerator._settledAt(REJECTED, i, reason);
+      });
+    }
+  }]);
+  return Enumerator;
+}();
+
+/**
+  `Promise.all` accepts an array of promises, and returns a new promise which
+  is fulfilled with an array of fulfillment values for the passed promises, or
+  rejected with the reason of the first passed promise to be rejected. It casts all
+  elements of the passed iterable to promises as it runs this algorithm.
+
+  Example:
+
+  ```javascript
+  let promise1 = resolve(1);
+  let promise2 = resolve(2);
+  let promise3 = resolve(3);
+  let promises = [ promise1, promise2, promise3 ];
+
+  Promise.all(promises).then(function(array){
+    // The array here would be [ 1, 2, 3 ];
+  });
+  ```
+
+  If any of the `promises` given to `all` are rejected, the first promise
+  that is rejected will be given as an argument to the returned promises's
+  rejection handler. For example:
+
+  Example:
+
+  ```javascript
+  let promise1 = resolve(1);
+  let promise2 = reject(new Error("2"));
+  let promise3 = reject(new Error("3"));
+  let promises = [ promise1, promise2, promise3 ];
+
+  Promise.all(promises).then(function(array){
+    // Code here never runs because there are rejected promises!
+  }, function(error) {
+    // error.message === "2"
+  });
+  ```
+
+  @method all
+  @static
+  @param {Array} entries array of promises
+  @param {String} label optional string for labeling the promise.
+  Useful for tooling.
+  @return {Promise} promise that is fulfilled when all `promises` have been
+  fulfilled, or rejected if any of them become rejected.
+  @static
+*/
+function all(entries) {
+  return new Enumerator(this, entries).promise;
+}
+
+/**
+  `Promise.race` returns a new promise which is settled in the same way as the
+  first passed promise to settle.
+
+  Example:
+
+  ```javascript
+  let promise1 = new Promise(function(resolve, reject){
+    setTimeout(function(){
+      resolve('promise 1');
+    }, 200);
+  });
+
+  let promise2 = new Promise(function(resolve, reject){
+    setTimeout(function(){
+      resolve('promise 2');
+    }, 100);
+  });
+
+  Promise.race([promise1, promise2]).then(function(result){
+    // result === 'promise 2' because it was resolved before promise1
+    // was resolved.
+  });
+  ```
+
+  `Promise.race` is deterministic in that only the state of the first
+  settled promise matters. For example, even if other promises given to the
+  `promises` array argument are resolved, but the first settled promise has
+  become rejected before the other promises became fulfilled, the returned
+  promise will become rejected:
+
+  ```javascript
+  let promise1 = new Promise(function(resolve, reject){
+    setTimeout(function(){
+      resolve('promise 1');
+    }, 200);
+  });
+
+  let promise2 = new Promise(function(resolve, reject){
+    setTimeout(function(){
+      reject(new Error('promise 2'));
+    }, 100);
+  });
+
+  Promise.race([promise1, promise2]).then(function(result){
+    // Code here never runs
+  }, function(reason){
+    // reason.message === 'promise 2' because promise 2 became rejected before
+    // promise 1 became fulfilled
+  });
+  ```
+
+  An example real-world use case is implementing timeouts:
+
+  ```javascript
+  Promise.race([ajax('foo.json'), timeout(5000)])
+  ```
+
+  @method race
+  @static
+  @param {Array} promises array of promises to observe
+  Useful for tooling.
+  @return {Promise} a promise which settles in the same way as the first passed
+  promise to settle.
+*/
+function race(entries) {
+  /*jshint validthis:true */
+  var Constructor = this;
+
+  if (!isArray(entries)) {
+    return new Constructor(function (_, reject) {
+      return reject(new TypeError('You must pass an array to race.'));
+    });
+  } else {
+    return new Constructor(function (resolve, reject) {
+      var length = entries.length;
+      for (var i = 0; i < length; i++) {
+        Constructor.resolve(entries[i]).then(resolve, reject);
+      }
+    });
+  }
+}
+
+/**
+  `Promise.reject` returns a promise rejected with the passed `reason`.
+  It is shorthand for the following:
+
+  ```javascript
+  let promise = new Promise(function(resolve, reject){
+    reject(new Error('WHOOPS'));
+  });
+
+  promise.then(function(value){
+    // Code here doesn't run because the promise is rejected!
+  }, function(reason){
+    // reason.message === 'WHOOPS'
+  });
+  ```
+
+  Instead of writing the above, your code now simply becomes the following:
+
+  ```javascript
+  let promise = Promise.reject(new Error('WHOOPS'));
+
+  promise.then(function(value){
+    // Code here doesn't run because the promise is rejected!
+  }, function(reason){
+    // reason.message === 'WHOOPS'
+  });
+  ```
+
+  @method reject
+  @static
+  @param {Any} reason value that the returned promise will be rejected with.
+  Useful for tooling.
+  @return {Promise} a promise rejected with the given `reason`.
+*/
+function reject$1(reason) {
+  /*jshint validthis:true */
+  var Constructor = this;
+  var promise = new Constructor(noop);
+  reject(promise, reason);
+  return promise;
+}
+
+function needsResolver() {
+  throw new TypeError('You must pass a resolver function as the first argument to the promise constructor');
+}
+
+function needsNew() {
+  throw new TypeError("Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function.");
+}
+
+/**
+  Promise objects represent the eventual result of an asynchronous operation. The
+  primary way of interacting with a promise is through its `then` method, which
+  registers callbacks to receive either a promise's eventual value or the reason
+  why the promise cannot be fulfilled.
+
+  Terminology
+  -----------
+
+  - `promise` is an object or function with a `then` method whose behavior conforms to this specification.
+  - `thenable` is an object or function that defines a `then` method.
+  - `value` is any legal JavaScript value (including undefined, a thenable, or a promise).
+  - `exception` is a value that is thrown using the throw statement.
+  - `reason` is a value that indicates why a promise was rejected.
+  - `settled` the final resting state of a promise, fulfilled or rejected.
+
+  A promise can be in one of three states: pending, fulfilled, or rejected.
+
+  Promises that are fulfilled have a fulfillment value and are in the fulfilled
+  state.  Promises that are rejected have a rejection reason and are in the
+  rejected state.  A fulfillment value is never a thenable.
+
+  Promises can also be said to *resolve* a value.  If this value is also a
+  promise, then the original promise's settled state will match the value's
+  settled state.  So a promise that *resolves* a promise that rejects will
+  itself reject, and a promise that *resolves* a promise that fulfills will
+  itself fulfill.
+
+
+  Basic Usage:
+  ------------
+
+  ```js
+  let promise = new Promise(function(resolve, reject) {
+    // on success
+    resolve(value);
+
+    // on failure
+    reject(reason);
+  });
+
+  promise.then(function(value) {
+    // on fulfillment
+  }, function(reason) {
+    // on rejection
+  });
+  ```
+
+  Advanced Usage:
+  ---------------
+
+  Promises shine when abstracting away asynchronous interactions such as
+  `XMLHttpRequest`s.
+
+  ```js
+  function getJSON(url) {
+    return new Promise(function(resolve, reject){
+      let xhr = new XMLHttpRequest();
+
+      xhr.open('GET', url);
+      xhr.onreadystatechange = handler;
+      xhr.responseType = 'json';
+      xhr.setRequestHeader('Accept', 'application/json');
+      xhr.send();
+
+      function handler() {
+        if (this.readyState === this.DONE) {
+          if (this.status === 200) {
+            resolve(this.response);
+          } else {
+            reject(new Error('getJSON: `' + url + '` failed with status: [' + this.status + ']'));
+          }
+        }
+      };
+    });
+  }
+
+  getJSON('/posts.json').then(function(json) {
+    // on fulfillment
+  }, function(reason) {
+    // on rejection
+  });
+  ```
+
+  Unlike callbacks, promises are great composable primitives.
+
+  ```js
+  Promise.all([
+    getJSON('/posts'),
+    getJSON('/comments')
+  ]).then(function(values){
+    values[0] // => postsJSON
+    values[1] // => commentsJSON
+
+    return values;
+  });
+  ```
+
+  @class Promise
+  @param {Function} resolver
+  Useful for tooling.
+  @constructor
+*/
+
+var Promise$3 = function () {
+  function Promise(resolver) {
+    classCallCheck(this, Promise);
+
+    this[PROMISE_ID] = nextId();
+    this._result = this._state = undefined;
+    this._subscribers = [];
+
+    if (noop !== resolver) {
+      typeof resolver !== 'function' && needsResolver();
+      this instanceof Promise ? initializePromise(this, resolver) : needsNew();
+    }
+  }
+
+  /**
+  The primary way of interacting with a promise is through its `then` method,
+  which registers callbacks to receive either a promise's eventual value or the
+  reason why the promise cannot be fulfilled.
+   ```js
+  findUser().then(function(user){
+    // user is available
+  }, function(reason){
+    // user is unavailable, and you are given the reason why
+  });
+  ```
+   Chaining
+  --------
+   The return value of `then` is itself a promise.  This second, 'downstream'
+  promise is resolved with the return value of the first promise's fulfillment
+  or rejection handler, or rejected if the handler throws an exception.
+   ```js
+  findUser().then(function (user) {
+    return user.name;
+  }, function (reason) {
+    return 'default name';
+  }).then(function (userName) {
+    // If `findUser` fulfilled, `userName` will be the user's name, otherwise it
+    // will be `'default name'`
+  });
+   findUser().then(function (user) {
+    throw new Error('Found user, but still unhappy');
+  }, function (reason) {
+    throw new Error('`findUser` rejected and we're unhappy');
+  }).then(function (value) {
+    // never reached
+  }, function (reason) {
+    // if `findUser` fulfilled, `reason` will be 'Found user, but still unhappy'.
+    // If `findUser` rejected, `reason` will be '`findUser` rejected and we're unhappy'.
+  });
+  ```
+  If the downstream promise does not specify a rejection handler, rejection reasons will be propagated further downstream.
+   ```js
+  findUser().then(function (user) {
+    throw new PedagogicalException('Upstream error');
+  }).then(function (value) {
+    // never reached
+  }).then(function (value) {
+    // never reached
+  }, function (reason) {
+    // The `PedgagocialException` is propagated all the way down to here
+  });
+  ```
+   Assimilation
+  ------------
+   Sometimes the value you want to propagate to a downstream promise can only be
+  retrieved asynchronously. This can be achieved by returning a promise in the
+  fulfillment or rejection handler. The downstream promise will then be pending
+  until the returned promise is settled. This is called *assimilation*.
+   ```js
+  findUser().then(function (user) {
+    return findCommentsByAuthor(user);
+  }).then(function (comments) {
+    // The user's comments are now available
+  });
+  ```
+   If the assimliated promise rejects, then the downstream promise will also reject.
+   ```js
+  findUser().then(function (user) {
+    return findCommentsByAuthor(user);
+  }).then(function (comments) {
+    // If `findCommentsByAuthor` fulfills, we'll have the value here
+  }, function (reason) {
+    // If `findCommentsByAuthor` rejects, we'll have the reason here
+  });
+  ```
+   Simple Example
+  --------------
+   Synchronous Example
+   ```javascript
+  let result;
+   try {
+    result = findResult();
+    // success
+  } catch(reason) {
+    // failure
+  }
+  ```
+   Errback Example
+   ```js
+  findResult(function(result, err){
+    if (err) {
+      // failure
+    } else {
+      // success
+    }
+  });
+  ```
+   Promise Example;
+   ```javascript
+  findResult().then(function(result){
+    // success
+  }, function(reason){
+    // failure
+  });
+  ```
+   Advanced Example
+  --------------
+   Synchronous Example
+   ```javascript
+  let author, books;
+   try {
+    author = findAuthor();
+    books  = findBooksByAuthor(author);
+    // success
+  } catch(reason) {
+    // failure
+  }
+  ```
+   Errback Example
+   ```js
+   function foundBooks(books) {
+   }
+   function failure(reason) {
+   }
+   findAuthor(function(author, err){
+    if (err) {
+      failure(err);
+      // failure
+    } else {
+      try {
+        findBoooksByAuthor(author, function(books, err) {
+          if (err) {
+            failure(err);
+          } else {
+            try {
+              foundBooks(books);
+            } catch(reason) {
+              failure(reason);
+            }
+          }
+        });
+      } catch(error) {
+        failure(err);
+      }
+      // success
+    }
+  });
+  ```
+   Promise Example;
+   ```javascript
+  findAuthor().
+    then(findBooksByAuthor).
+    then(function(books){
+      // found books
+  }).catch(function(reason){
+    // something went wrong
+  });
+  ```
+   @method then
+  @param {Function} onFulfilled
+  @param {Function} onRejected
+  Useful for tooling.
+  @return {Promise}
+  */
+
+  /**
+  `catch` is simply sugar for `then(undefined, onRejection)` which makes it the same
+  as the catch block of a try/catch statement.
+  ```js
+  function findAuthor(){
+  throw new Error('couldn't find that author');
+  }
+  // synchronous
+  try {
+  findAuthor();
+  } catch(reason) {
+  // something went wrong
+  }
+  // async with promises
+  findAuthor().catch(function(reason){
+  // something went wrong
+  });
+  ```
+  @method catch
+  @param {Function} onRejection
+  Useful for tooling.
+  @return {Promise}
+  */
+
+
+  createClass(Promise, [{
+    key: 'catch',
+    value: function _catch(onRejection) {
+      return this.then(null, onRejection);
+    }
+
+    /**
+      `finally` will be invoked regardless of the promise's fate just as native
+      try/catch/finally behaves
+    
+      Synchronous example:
+    
+      ```js
+      findAuthor() {
+        if (Math.random() > 0.5) {
+          throw new Error();
+        }
+        return new Author();
+      }
+    
+      try {
+        return findAuthor(); // succeed or fail
+      } catch(error) {
+        return findOtherAuther();
+      } finally {
+        // always runs
+        // doesn't affect the return value
+      }
+      ```
+    
+      Asynchronous example:
+    
+      ```js
+      findAuthor().catch(function(reason){
+        return findOtherAuther();
+      }).finally(function(){
+        // author was either found, or not
+      });
+      ```
+    
+      @method finally
+      @param {Function} callback
+      @return {Promise}
+    */
+
+  }, {
+    key: 'finally',
+    value: function _finally(callback) {
+      var promise = this;
+      var constructor = promise.constructor;
+
+      return promise.then(function (value) {
+        return constructor.resolve(callback()).then(function () {
+          return value;
+        });
+      }, function (reason) {
+        return constructor.resolve(callback()).then(function () {
+          throw reason;
+        });
+      });
+    }
+  }]);
+  return Promise;
+}();
+
+Promise$3.prototype.then = then;
+Promise$3.all = all;
+Promise$3.race = race;
+Promise$3.resolve = resolve$1;
+Promise$3.reject = reject$1;
+Promise$3._setScheduler = setScheduler;
+Promise$3._setAsap = setAsap;
+Promise$3._asap = asap;
+
+/*global self*/
+function polyfill() {
+  var local = void 0;
+
+  if (typeof global !== 'undefined') {
+    local = global;
+  } else if (typeof self !== 'undefined') {
+    local = self;
+  } else {
+    try {
+      local = Function('return this')();
+    } catch (e) {
+      throw new Error('polyfill failed because global object is unavailable in this environment');
+    }
+  }
+
+  var P = local.Promise;
+
+  if (P) {
+    var promiseToString = null;
+    try {
+      promiseToString = Object.prototype.toString.call(P.resolve());
+    } catch (e) {
+      // silently ignored
+    }
+
+    if (promiseToString === '[object Promise]' && !P.cast) {
+      return;
+    }
+  }
+
+  local.Promise = Promise$3;
+}
+
+// Strange compat..
+Promise$3.polyfill = polyfill;
+Promise$3.Promise = Promise$3;
+
+Promise$3.polyfill();
 
 /**
  * @license
@@ -670,63 +1814,58 @@ var createClass = function () {
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
 
-(function () {
-
-  'use strict';
-
-  // Establish scope.
+// Establish scope.
 
-  window['WebComponents'] = window['WebComponents'] || { 'flags': {} };
+window['WebComponents'] = window['WebComponents'] || { 'flags': {} };
 
-  // loading script
-  var file = 'webcomponents-lite.js';
-  var script = document.querySelector('script[src*="' + file + '"]');
-  var flagMatcher = /wc-(.+)/;
+// loading script
+var file = 'webcomponents-lite.js';
+var script = document.querySelector('script[src*="' + file + '"]');
+var flagMatcher = /wc-(.+)/;
 
-  // Flags. Convert url arguments to flags
-  var flags = {};
-  if (!flags['noOpts']) {
-    // from url
-    location.search.slice(1).split('&').forEach(function (option) {
-      var parts = option.split('=');
-      var match;
-      if (parts[0] && (match = parts[0].match(flagMatcher))) {
-        flags[match[1]] = parts[1] || true;
-      }
-    });
-    // from script
-    if (script) {
-      for (var i = 0, a; a = script.attributes[i]; i++) {
-        if (a.name !== 'src') {
-          flags[a.name] = a.value || true;
-        }
-      }
+// Flags. Convert url arguments to flags
+var flags = {};
+if (!flags['noOpts']) {
+  // from url
+  location.search.slice(1).split('&').forEach(function (option) {
+    var parts = option.split('=');
+    var match = void 0;
+    if (parts[0] && (match = parts[0].match(flagMatcher))) {
+      flags[match[1]] = parts[1] || true;
     }
-    // log flags
-    if (flags['log'] && flags['log']['split']) {
-      var parts = flags['log'].split(',');
-      flags['log'] = {};
-      parts.forEach(function (f) {
-        flags['log'][f] = true;
-      });
-    } else {
-      flags['log'] = {};
+  });
+  // from script
+  if (script) {
+    for (var i = 0, a; a = script.attributes[i]; i++) {
+      if (a.name !== 'src') {
+        flags[a.name] = a.value || true;
+      }
     }
   }
-
-  // exports
-  window['WebComponents']['flags'] = flags;
-  var forceShady = flags['shadydom'];
-  if (forceShady) {
-    window['ShadyDOM'] = window['ShadyDOM'] || {};
-    window['ShadyDOM']['force'] = forceShady;
+  // log flags
+  if (flags['log'] && flags['log']['split']) {
+    var parts = flags['log'].split(',');
+    flags['log'] = {};
+    parts.forEach(function (f) {
+      flags['log'][f] = true;
+    });
+  } else {
+    flags['log'] = {};
   }
+}
 
-  var forceCE = flags['register'] || flags['ce'];
-  if (forceCE && window['customElements']) {
-    window['customElements']['forcePolyfill'] = forceCE;
-  }
-})();
+// exports
+window['WebComponents']['flags'] = flags;
+var forceShady = flags['shadydom'];
+if (forceShady) {
+  window['ShadyDOM'] = window['ShadyDOM'] || {};
+  window['ShadyDOM']['force'] = forceShady;
+}
+
+var forceCE = flags['register'] || flags['ce'];
+if (forceCE && window['customElements']) {
+  window['customElements']['forcePolyfill'] = forceCE;
+}
 
 /**
 @license
@@ -818,12 +1957,12 @@ function patchPrototype(obj, mixin) {
 
 var twiddle = document.createTextNode('');
 var content = 0;
-var queue = [];
+var queue$1 = [];
 new MutationObserver(function () {
-  while (queue.length) {
+  while (queue$1.length) {
     // catch errors in user code...
     try {
-      queue.shift()();
+      queue$1.shift()();
     } catch (e) {
       // enqueue another record and throw
       twiddle.textContent = content++;
@@ -834,10 +1973,22 @@ new MutationObserver(function () {
 
 // use MutationObserver to get microtask async timing.
 function microtask(callback) {
-  queue.push(callback);
+  queue$1.push(callback);
   twiddle.textContent = content++;
 }
 
+var hasDocumentContains = Boolean(document.contains);
+
+function contains(container, node) {
+  while (node) {
+    if (node == container) {
+      return true;
+    }
+    node = node.parentNode;
+  }
+  return false;
+}
+
 /**
 @license
 Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
@@ -854,12 +2005,12 @@ var scheduled = void 0;
 function enqueue(callback) {
   if (!scheduled) {
     scheduled = true;
-    microtask(flush);
+    microtask(flush$1);
   }
   flushList.push(callback);
 }
 
-function flush() {
+function flush$1() {
   scheduled = false;
   var didFlush = Boolean(flushList.length);
   while (flushList.length) {
@@ -868,7 +2019,7 @@ function flush() {
   return didFlush;
 }
 
-flush['list'] = flushList;
+flush$1['list'] = flushList;
 
 /**
 @license
@@ -1017,6 +2168,7 @@ var windowRemoveEventListener = Window.prototype.removeEventListener;
 var dispatchEvent = Element.prototype.dispatchEvent;
 var querySelector = Element.prototype.querySelector;
 var querySelectorAll = Element.prototype.querySelectorAll;
+var contains$1 = Node.prototype.contains || HTMLElement.prototype.contains;
 
 var nativeMethods = Object.freeze({
 	appendChild: appendChild,
@@ -1032,7 +2184,8 @@ var nativeMethods = Object.freeze({
 	windowRemoveEventListener: windowRemoveEventListener,
 	dispatchEvent: dispatchEvent,
 	querySelector: querySelector,
-	querySelectorAll: querySelectorAll
+	querySelectorAll: querySelectorAll,
+	contains: contains$1
 });
 
 /**
@@ -1293,7 +2446,6 @@ function clearNode(node) {
 var nativeInnerHTMLDesc = /** @type {ObjectPropertyDescriptor} */Object.getOwnPropertyDescriptor(Element.prototype, 'innerHTML') || Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerHTML');
 
 var inertDoc = document.implementation.createHTMLDocument('inert');
-var htmlContainer = inertDoc.createElement('div');
 
 var nativeActiveElementDescriptor =
 /** @type {ObjectPropertyDescriptor} */Object.getOwnPropertyDescriptor(Document.prototype, 'activeElement');
@@ -1323,7 +2475,7 @@ function activeElementForNode(node) {
     // If this shady root's host is the active element or the active
     // element is not a descendant of the host (in the composed tree),
     // then it doesn't have an active element.
-    if (node.host === active || !node.host.contains(active)) {
+    if (node.host === active || !contains$1.call(node.host, active)) {
       return null;
     }
   }
@@ -1529,11 +2681,17 @@ var InsideAccessors = {
      * @param {string} text
      */
     set: function set(text) {
+      if (typeof text === 'undefined' || text === null) {
+        text = '';
+      }
       switch (this.nodeType) {
         case Node.ELEMENT_NODE:
         case Node.DOCUMENT_FRAGMENT_NODE:
           clearNode(this);
-          this.appendChild(document.createTextNode(text));
+          // Document fragments must have no childnodes if setting a blank string
+          if (text.length > 0 || this.nodeType === Node.ELEMENT_NODE) {
+            this.appendChild(document.createTextNode(text));
+          }
           break;
         default:
           // TODO(sorvell): can't do this if patch nodeValue.
@@ -1628,6 +2786,11 @@ var InsideAccessors = {
       var content = this.localName === 'template' ?
       /** @type {HTMLTemplateElement} */this.content : this;
       clearNode(content);
+      var containerName = this.localName;
+      if (!containerName || containerName === 'template') {
+        containerName = 'div';
+      }
+      var htmlContainer = inertDoc.createElement(containerName);
       if (nativeInnerHTMLDesc && nativeInnerHTMLDesc.set) {
         nativeInnerHTMLDesc.set.call(htmlContainer, text);
       } else {
@@ -1890,6 +3053,9 @@ function insertBefore$1(parent, node, ref_node) {
   var ownerRoot = ownerShadyRootForNode(parent);
   // if a slot is added, must render containing root.
   var slotsAdded = ownerRoot && findContainedSlots(node);
+  if (slotsAdded) {
+    ownerRoot._addSlots(slotsAdded);
+  }
   if (ownerRoot && (parent.localName === 'slot' || slotsAdded)) {
     ownerRoot._asyncRender();
   }
@@ -1919,10 +3085,6 @@ function insertBefore$1(parent, node, ref_node) {
     }
   }
   scheduleObserver(parent, node);
-  // with insertion complete, can safely update insertion points.
-  if (slotsAdded) {
-    ownerRoot._addSlots(slotsAdded);
-  }
   return node;
 }
 
@@ -2090,7 +3252,7 @@ function getRootNode(node, options) {
     // can be cached while an element is inside a fragment.
     // If this happens and we cache the result, the value can become stale
     // because for perf we avoid processing the subtree of added fragments.
-    if (document.documentElement.contains(node)) {
+    if (contains$1.call(document.documentElement, node)) {
       node.__shady.ownerShadyRoot = root;
     }
   }
@@ -2202,6 +3364,12 @@ Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
+/*
+Make this name unique so it is unlikely to conflict with properties on objects passed to `addEventListener`
+https://github.com/webcomponents/shadydom/issues/173
+*/
+var eventWrappersName = '__eventWrappers' + Date.now();
+
 // https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937
 var alwaysComposed = {
   'blur': true,
@@ -2376,11 +3544,26 @@ var nonBubblingEventsToRetarget = {
   'blur': true
 };
 
+/**
+ * Check if the event has been retargeted by comparing original `target`, and calculated `target`
+ * @param {Event} event
+ * @return {boolean} True if the original target and calculated target are the same
+ */
+function hasRetargeted(event) {
+  return event['__target'] !== event.target || event.__relatedTarget !== event.relatedTarget;
+}
+
+/**
+ *
+ * @param {Event} event
+ * @param {Node} node
+ * @param {string} phase
+ */
 function fireHandlers(event, node, phase) {
   var hs = node.__handlers && node.__handlers[event.type] && node.__handlers[event.type][phase];
   if (hs) {
     for (var i = 0, fn; fn = hs[i]; i++) {
-      if (event.target === event.relatedTarget) {
+      if (hasRetargeted(event) && event.target === event.relatedTarget) {
         return;
       }
       fn.call(node, event);
@@ -2456,14 +3639,14 @@ function findListener(wrappers, node, type, capture, once, passive) {
 }
 
 /**
- * Firefox can throw on accessing __eventWrappers inside of `removeEventListener` during a selenium run
- * Try/Catch accessing __eventWrappers to work around
+ * Firefox can throw on accessing eventWrappers inside of `removeEventListener` during a selenium run
+ * Try/Catch accessing eventWrappers to work around
  * https://bugzilla.mozilla.org/show_bug.cgi?id=1353074
  */
 function getEventWrappers(eventLike) {
   var wrappers = null;
   try {
-    wrappers = eventLike.__eventWrappers;
+    wrappers = eventLike[eventWrappersName];
   } catch (e) {} // eslint-disable-line no-empty
   return wrappers;
 }
@@ -2476,6 +3659,18 @@ function addEventListener$1(type, fnOrObj, optionsOrCapture) {
     return;
   }
 
+  var handlerType = typeof fnOrObj === 'undefined' ? 'undefined' : _typeof(fnOrObj);
+
+  // bail if `fnOrObj` is not a function, not an object
+  if (handlerType !== 'function' && handlerType !== 'object') {
+    return;
+  }
+
+  // bail if `fnOrObj` is an object without a `handleEvent` method
+  if (handlerType === 'object' && (!fnOrObj.handleEvent || typeof fnOrObj.handleEvent !== 'function')) {
+    return;
+  }
+
   // The callback `fn` might be used for multiple nodes/events. Since we generate
   // a wrapper function, we need to keep track of it when we remove the listener.
   // It's more efficient to store the node/type/options information as Array in
@@ -2485,7 +3680,7 @@ function addEventListener$1(type, fnOrObj, optionsOrCapture) {
   var capture = void 0,
       once = void 0,
       passive = void 0;
-  if ((typeof optionsOrCapture === 'undefined' ? 'undefined' : _typeof(optionsOrCapture)) === 'object') {
+  if (optionsOrCapture && (typeof optionsOrCapture === 'undefined' ? 'undefined' : _typeof(optionsOrCapture)) === 'object') {
     capture = Boolean(optionsOrCapture.capture);
     once = Boolean(optionsOrCapture.once);
     passive = Boolean(optionsOrCapture.passive);
@@ -2499,18 +3694,19 @@ function addEventListener$1(type, fnOrObj, optionsOrCapture) {
   // will be set to shadyroot for event listener
   var target = optionsOrCapture && optionsOrCapture.__shadyTarget || this;
 
-  var wrappers = fnOrObj.__eventWrappers;
+  var wrappers = fnOrObj[eventWrappersName];
   if (wrappers) {
     // Stop if the wrapper function has already been created.
     if (findListener(wrappers, target, type, capture, once, passive) > -1) {
       return;
     }
   } else {
-    fnOrObj.__eventWrappers = [];
+    fnOrObj[eventWrappersName] = [];
   }
 
   /**
    * @this {HTMLElement}
+   * @param {Event} e
    */
   var wrapperFn = function wrapperFn(e) {
     // Support `once` option.
@@ -2534,17 +3730,17 @@ function addEventListener$1(type, fnOrObj, optionsOrCapture) {
     // 1. the event is not composed and the current node is not in the same root as the target
     // 2. when bubbling, if after retargeting, relatedTarget and target point to the same node
     if (e.composed || e.composedPath().indexOf(target) > -1) {
-      if (e.target === e.relatedTarget) {
+      if (hasRetargeted(e) && e.target === e.relatedTarget) {
         if (e.eventPhase === Event.BUBBLING_PHASE) {
           e.stopImmediatePropagation();
         }
         return;
       }
       // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase
-      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target) {
+      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target && !(target instanceof Window)) {
         return;
       }
-      var ret = (typeof fnOrObj === 'undefined' ? 'undefined' : _typeof(fnOrObj)) === 'object' && fnOrObj.handleEvent ? fnOrObj.handleEvent(e) : fnOrObj.call(target, e);
+      var ret = handlerType === 'function' ? fnOrObj.call(target, e) : fnOrObj.handleEvent && fnOrObj.handleEvent(e);
       if (target !== this) {
         // replace the "correct" `currentTarget`
         if (lastCurrentTargetDesc) {
@@ -2558,7 +3754,7 @@ function addEventListener$1(type, fnOrObj, optionsOrCapture) {
     }
   };
   // Store the wrapper information.
-  fnOrObj.__eventWrappers.push({
+  fnOrObj[eventWrappersName].push({
     node: this,
     type: type,
     capture: capture,
@@ -2589,7 +3785,7 @@ function removeEventListener$1(type, fnOrObj, optionsOrCapture) {
   var capture = void 0,
       once = void 0,
       passive = void 0;
-  if ((typeof optionsOrCapture === 'undefined' ? 'undefined' : _typeof(optionsOrCapture)) === 'object') {
+  if (optionsOrCapture && (typeof optionsOrCapture === 'undefined' ? 'undefined' : _typeof(optionsOrCapture)) === 'object') {
     capture = Boolean(optionsOrCapture.capture);
     once = Boolean(optionsOrCapture.once);
     passive = Boolean(optionsOrCapture.passive);
@@ -2608,7 +3804,7 @@ function removeEventListener$1(type, fnOrObj, optionsOrCapture) {
       wrapperFn = wrappers.splice(idx, 1)[0].wrapperFn;
       // Cleanup.
       if (!wrappers.length) {
-        fnOrObj.__eventWrappers = undefined;
+        fnOrObj[eventWrappersName] = undefined;
       }
     }
   }
@@ -2941,7 +4137,8 @@ ShadyRoot.prototype._init = function (host, options) {
   this._renderPending = false;
   this._hasRendered = false;
   this._slotList = [];
-  this._slotMap = null;
+  this._slotMap = {};
+  this.__pendingSlots = [];
   // fast path initial render: remove existing physical dom.
   var c$ = childNodes(host);
   for (var i = 0, l = c$.length; i < l; i++) {
@@ -2963,7 +4160,7 @@ ShadyRoot.prototype._asyncRender = function () {
 
 // returns the oldest renderPending ancestor root.
 ShadyRoot.prototype._getRenderRoot = function () {
-  var renderRoot = this;
+  var renderRoot = void 0;
   var root = this;
   while (root) {
     if (root._renderPending) {
@@ -2990,8 +4187,9 @@ ShadyRoot.prototype._rendererForHost = function () {
 };
 
 ShadyRoot.prototype._render = function () {
-  if (this._renderPending) {
-    this._getRenderRoot()['_renderRoot']();
+  var root = this._getRenderRoot();
+  if (root) {
+    root['_renderRoot']();
   }
 };
 
@@ -3004,6 +4202,7 @@ ShadyRoot.prototype['_renderRoot'] = function () {
 };
 
 ShadyRoot.prototype._distribute = function () {
+  this._validateSlots();
   // capture # of previously assigned nodes to help determine if dirty.
   for (var i = 0, slot; i < this._slotList.length; i++) {
     slot = this._slotList[i];
@@ -3111,12 +4310,15 @@ ShadyRoot.prototype._clearSlotAssignedNodes = function (slot) {
   }
 };
 
-ShadyRoot.prototype._addAssignedToFlattenedNodes = function (flattened, asssigned) {
-  for (var i = 0, n; i < asssigned.length && (n = asssigned[i]); i++) {
+ShadyRoot.prototype._addAssignedToFlattenedNodes = function (flattened, assigned) {
+  for (var i = 0, n; i < assigned.length && (n = assigned[i]); i++) {
     if (n.localName == 'slot') {
-      this._addAssignedToFlattenedNodes(flattened, n.__shady.assignedNodes);
+      var nestedAssigned = n.__shady.assignedNodes;
+      if (nestedAssigned && nestedAssigned.length) {
+        this._addAssignedToFlattenedNodes(flattened, nestedAssigned);
+      }
     } else {
-      flattened.push(asssigned[i]);
+      flattened.push(assigned[i]);
     }
   }
 };
@@ -3214,14 +4416,25 @@ ShadyRoot.prototype._updateChildNodes = function (container, children$$1) {
   }
 };
 
+ShadyRoot.prototype._addSlots = function (slots) {
+  var _pendingSlots;
+
+  (_pendingSlots = this.__pendingSlots).push.apply(_pendingSlots, toConsumableArray(slots));
+};
+
+ShadyRoot.prototype._validateSlots = function () {
+  if (this.__pendingSlots.length) {
+    this._mapSlots(this.__pendingSlots);
+    this.__pendingSlots = [];
+  }
+};
+
 /**
  * Adds the given slots. Slots are maintained in an dom-ordered list.
  * In addition a map of name to slot is updated.
  */
-ShadyRoot.prototype._addSlots = function (slots) {
+ShadyRoot.prototype._mapSlots = function (slots) {
   var slotNamesToSort = void 0;
-  this._slotMap = this._slotMap || {};
-  this._slotList = this._slotList || [];
   for (var i = 0; i < slots.length; i++) {
     var slot = slots[i];
     // ensure insertionPoints's and their parents have logical dom info.
@@ -3285,25 +4498,14 @@ function ancestorList(node) {
   return ancestors;
 }
 
-// NOTE: could be used to help polyfill `document.contains`.
-function contains(container, node) {
-  while (node) {
-    if (node == container) {
-      return true;
-    }
-    node = node.parentNode;
-  }
-}
-
 /**
  * Removes from tracked slot data any slots contained within `container` and
  * then updates the tracked data (_slotList and _slotMap).
  * Any removed slots also have their `assignedNodes` removed from comopsed dom.
  */
 ShadyRoot.prototype._removeContainedSlots = function (container) {
+  this._validateSlots();
   var didRemove = void 0;
-  this._slotMap = this._slotMap || {};
-  this._slotList = this._slotList || [];
   var map = this._slotMap;
   for (var n in map) {
     var slots = map[n];
@@ -3358,6 +4560,7 @@ ShadyRoot.prototype._removeFlattenedNodes = function (slot) {
 };
 
 ShadyRoot.prototype._hasInsertionPoint = function () {
+  this._validateSlots();
   return Boolean(this._slotList.length);
 };
 
@@ -3473,6 +4676,9 @@ var nodeMixin = {
   getRootNode: function getRootNode$$1(options) {
     return getRootNode(this, options);
   },
+  contains: function contains$$1(node) {
+    return contains(this, node);
+  },
 
 
   /**
@@ -3481,10 +4687,12 @@ var nodeMixin = {
   get isConnected() {
     // Fast path for distributed nodes.
     var ownerDocument = this.ownerDocument;
-    if (ownerDocument && ownerDocument.contains && ownerDocument.contains(this)) return true;
-    var ownerDocumentElement = ownerDocument.documentElement;
-    if (ownerDocumentElement && ownerDocumentElement.contains && ownerDocumentElement.contains(this)) return true;
-
+    if (hasDocumentContains && contains$1.call(ownerDocument, this)) {
+      return true;
+    }
+    if (ownerDocument.documentElement && contains$1.call(ownerDocument.documentElement, this)) {
+      return true;
+    }
     var node = this;
     while (node && !(node instanceof Document)) {
       node = node.parentNode || (node instanceof ShadyRoot ? /** @type {ShadowRoot} */node.host : undefined);
@@ -3496,7 +4704,7 @@ var nodeMixin = {
    * @this {Node}
    */
   dispatchEvent: function dispatchEvent$$1(event) {
-    flush();
+    flush$1();
     return dispatchEvent.call(this, event);
   }
 };
@@ -3729,7 +4937,7 @@ if (settings.inUse) {
     },
     'isShadyRoot': isShadyRoot,
     'enqueue': enqueue,
-    'flush': flush,
+    'flush': flush$1,
     'settings': settings,
     'filterMutations': filterMutations,
     'observeChildren': observeChildren,
@@ -4106,11 +5314,14 @@ var CustomElementInternals = function () {
           // the `import` property, specifically this is *not* a Document.
           var importNode = /** @type {?Node} */element.import;
 
-          if (importNode instanceof Node && importNode.readyState === 'complete') {
+          if (importNode instanceof Node) {
             importNode.__CE_isImportDocument = true;
-
             // Connected links are associated with the registry.
             importNode.__CE_hasRegistry = true;
+          }
+
+          if (importNode && importNode.readyState === 'complete') {
+            importNode.__CE_documentLoadHandled = true;
           } else {
             // If this link's import root is not available, its contents can't be
             // walked. Wait for 'load' and walk it when it's ready.
@@ -4120,20 +5331,15 @@ var CustomElementInternals = function () {
               if (importNode.__CE_documentLoadHandled) return;
               importNode.__CE_documentLoadHandled = true;
 
-              importNode.__CE_isImportDocument = true;
-
-              // Connected links are associated with the registry.
-              importNode.__CE_hasRegistry = true;
-
               // Clone the `visitedImports` set that was populated sync during
               // the `patchAndUpgradeTree` call that caused this 'load' handler to
               // be added. Then, remove *this* link's import node so that we can
               // walk that import again, even if it was partially walked later
               // during the same `patchAndUpgradeTree` call.
               var clonedVisitedImports = new Set(visitedImports);
-              visitedImports.delete(importNode);
+              clonedVisitedImports.delete(importNode);
 
-              _this2.patchAndUpgradeTree(importNode, { visitedImports: visitedImports, upgrade: upgrade });
+              _this2.patchAndUpgradeTree(importNode, { visitedImports: clonedVisitedImports, upgrade: upgrade });
             });
           }
         } else {
@@ -4166,6 +5372,19 @@ var CustomElementInternals = function () {
       var currentState = element.__CE_state;
       if (currentState !== undefined) return;
 
+      // Prevent elements created in documents without a browsing context from
+      // upgrading.
+      //
+      // https://html.spec.whatwg.org/multipage/custom-elements.html#look-up-a-custom-element-definition
+      //   "If document does not have a browsing context, return null."
+      //
+      // https://html.spec.whatwg.org/multipage/window-object.html#dom-document-defaultview
+      //   "The defaultView IDL attribute of the Document interface, on getting,
+      //   must return this Document's browsing context's WindowProxy object, if
+      //   this Document has an associated browsing context, or null otherwise."
+      var ownerDocument = element.ownerDocument;
+      if (!ownerDocument.defaultView && !(ownerDocument.__CE_isImportDocument && ownerDocument.__CE_hasRegistry)) return;
+
       var definition = this.localNameToDefinition(element.localName);
       if (!definition) return;
 
@@ -4517,6 +5736,7 @@ var CustomElementRegistry = function () {
         constructionStack: []
       };
 
+      this._internals.setDefinition(localName, definition);
       this._pendingDefinitions.push(definition);
 
       // If we've already called the flush callback and it hasn't called back yet,
@@ -4540,39 +5760,58 @@ var CustomElementRegistry = function () {
       this._flushPending = false;
 
       var pendingDefinitions = this._pendingDefinitions;
-      /** @type {!Map<string, !Array<!Element>>} */
-      var localNameToUpgradableElements = new Map();
+
+      /**
+       * Unupgraded elements with definitions that were defined *before* the last
+       * flush, in document order.
+       * @type {!Array<!Element>}
+       */
+      var elementsWithStableDefinitions = [];
+
+      /**
+       * A map from `localName`s of definitions that were defined *after* the last
+       * flush to unupgraded elements matching that definition, in document order.
+       * @type {!Map<string, !Array<!Element>>}
+       */
+      var elementsWithPendingDefinitions = new Map();
       for (var i = 0; i < pendingDefinitions.length; i++) {
-        localNameToUpgradableElements.set(pendingDefinitions[i].localName, []);
+        elementsWithPendingDefinitions.set(pendingDefinitions[i].localName, []);
       }
 
       this._internals.patchAndUpgradeTree(document, {
         upgrade: function upgrade(element) {
-          // Attempt to upgrade using *non-pending* definitions.
-          _this2._internals.upgradeElement(element);
-
-          // If the element was upgraded, then no pending definition applies to it.
+          // Ignore the element if it has already upgraded or failed to upgrade.
           if (element.__CE_state !== undefined) return;
 
+          var localName = element.localName;
+
           // If there is an applicable pending definition for the element, add the
-          // element to the set of upgradable elements for that definition.
-          var upgradableElements = localNameToUpgradableElements.get(element.localName);
-          if (upgradableElements) {
-            upgradableElements.push(element);
+          // element to the list of elements to be upgraded with that definition.
+          var pendingElements = elementsWithPendingDefinitions.get(localName);
+          if (pendingElements) {
+            pendingElements.push(element);
+            // If there is *any other* applicable definition for the element, add it
+            // to the list of elements with stable definitions that need to be upgraded.
+          } else if (_this2._internals.localNameToDefinition(localName)) {
+            elementsWithStableDefinitions.push(element);
           }
         }
       });
 
+      // Upgrade elements with 'stable' definitions first.
+      for (var _i = 0; _i < elementsWithStableDefinitions.length; _i++) {
+        this._internals.upgradeElement(elementsWithStableDefinitions[_i]);
+      }
+
+      // Upgrade elements with 'pending' definitions in the order they were defined.
       while (pendingDefinitions.length > 0) {
         var definition = pendingDefinitions.shift();
         var localName = definition.localName;
 
-        this._internals.setDefinition(localName, definition);
-
         // Attempt to upgrade all applicable elements.
-        var upgradableElements = localNameToUpgradableElements.get(definition.localName);
-        for (var _i = 0; _i < upgradableElements.length; _i++) {
-          this._internals.upgradeElement(upgradableElements[_i]);
+        var pendingUpgradableElements = elementsWithPendingDefinitions.get(definition.localName);
+        for (var _i2 = 0; _i2 < pendingUpgradableElements.length; _i2++) {
+          this._internals.upgradeElement(pendingUpgradableElements[_i2]);
         }
 
         // Resolve any promises created by `whenDefined` for the definition.
@@ -4658,6 +5897,8 @@ var Native = {
   Document_importNode: window.Document.prototype.importNode,
   Document_prepend: window.Document.prototype['prepend'],
   Document_append: window.Document.prototype['append'],
+  DocumentFragment_prepend: window.DocumentFragment.prototype['prepend'],
+  DocumentFragment_append: window.DocumentFragment.prototype['append'],
   Node_cloneNode: window.Node.prototype.cloneNode,
   Node_appendChild: window.Node.prototype.appendChild,
   Node_insertBefore: window.Node.prototype.insertBefore,
@@ -4754,64 +5995,67 @@ var PatchHTMLElement = function (internals) {
  */
 var PatchParentNode = function (internals, destination, builtIn) {
   /**
-   * @param {...(!Node|string)} nodes
+   * @param {!function(...(!Node|string))} builtInMethod
+   * @return {!function(...(!Node|string))}
    */
-  destination['prepend'] = function () {
-    for (var _len = arguments.length, nodes = Array(_len), _key = 0; _key < _len; _key++) {
-      nodes[_key] = arguments[_key];
-    }
+  function appendPrependPatch(builtInMethod) {
+    return function () {
+      /**
+       * A copy of `nodes`, with any DocumentFragment replaced by its children.
+       * @type {!Array<!Node>}
+       */
+      var flattenedNodes = [];
 
-    // TODO: Fix this for when one of `nodes` is a DocumentFragment!
-    var connectedBefore = /** @type {!Array<!Node>} */nodes.filter(function (node) {
-      // DocumentFragments are not connected and will not be added to the list.
-      return node instanceof Node && isConnected(node);
-    });
+      /**
+       * Elements in `nodes` that were connected before this call.
+       * @type {!Array<!Node>}
+       */
+      var connectedElements = [];
 
-    builtIn.prepend.apply(this, nodes);
+      for (var _len = arguments.length, nodes = Array(_len), _key = 0; _key < _len; _key++) {
+        nodes[_key] = arguments[_key];
+      }
 
-    for (var i = 0; i < connectedBefore.length; i++) {
-      internals.disconnectTree(connectedBefore[i]);
-    }
+      for (var i = 0; i < nodes.length; i++) {
+        var node = nodes[i];
 
-    if (isConnected(this)) {
-      for (var _i = 0; _i < nodes.length; _i++) {
-        var node = nodes[_i];
-        if (node instanceof Element) {
-          internals.connectTree(node);
+        if (node instanceof Element && isConnected(node)) {
+          connectedElements.push(node);
         }
-      }
-    }
-  };
-
-  /**
-   * @param {...(!Node|string)} nodes
-   */
-  destination['append'] = function () {
-    for (var _len2 = arguments.length, nodes = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
-      nodes[_key2] = arguments[_key2];
-    }
 
-    // TODO: Fix this for when one of `nodes` is a DocumentFragment!
-    var connectedBefore = /** @type {!Array<!Node>} */nodes.filter(function (node) {
-      // DocumentFragments are not connected and will not be added to the list.
-      return node instanceof Node && isConnected(node);
-    });
+        if (node instanceof DocumentFragment) {
+          for (var child = node.firstChild; child; child = child.nextSibling) {
+            flattenedNodes.push(child);
+          }
+        } else {
+          flattenedNodes.push(node);
+        }
+      }
 
-    builtIn.append.apply(this, nodes);
+      builtInMethod.apply(this, nodes);
 
-    for (var i = 0; i < connectedBefore.length; i++) {
-      internals.disconnectTree(connectedBefore[i]);
-    }
+      for (var _i = 0; _i < connectedElements.length; _i++) {
+        internals.disconnectTree(connectedElements[_i]);
+      }
 
-    if (isConnected(this)) {
-      for (var _i2 = 0; _i2 < nodes.length; _i2++) {
-        var node = nodes[_i2];
-        if (node instanceof Element) {
-          internals.connectTree(node);
+      if (isConnected(this)) {
+        for (var _i2 = 0; _i2 < flattenedNodes.length; _i2++) {
+          var _node = flattenedNodes[_i2];
+          if (_node instanceof Element) {
+            internals.connectTree(_node);
+          }
         }
       }
-    }
-  };
+    };
+  }
+
+  if (builtIn.prepend !== undefined) {
+    setPropertyUnchecked(destination, 'prepend', appendPrependPatch(builtIn.prepend));
+  }
+
+  if (builtIn.append !== undefined) {
+    setPropertyUnchecked(destination, 'append', appendPrependPatch(builtIn.append));
+  }
 };
 
 /**
@@ -4887,6 +6131,16 @@ var PatchDocument = function (internals) {
   });
 };
 
+/**
+ * @param {!CustomElementInternals} internals
+ */
+var PatchDocumentFragment = function (internals) {
+  PatchParentNode(internals, DocumentFragment.prototype, {
+    prepend: Native.DocumentFragment_prepend,
+    append: Native.DocumentFragment_append
+  });
+};
+
 /**
  * @param {!CustomElementInternals} internals
  */
@@ -5125,107 +6379,137 @@ var PatchNode = function (internals) {
  */
 var PatchChildNode = function (internals, destination, builtIn) {
   /**
-   * @param {...(!Node|string)} nodes
+   * @param {!function(...(!Node|string))} builtInMethod
+   * @return {!function(...(!Node|string))}
    */
-  destination['before'] = function () {
-    for (var _len = arguments.length, nodes = Array(_len), _key = 0; _key < _len; _key++) {
-      nodes[_key] = arguments[_key];
-    }
+  function beforeAfterPatch(builtInMethod) {
+    return function () {
+      /**
+       * A copy of `nodes`, with any DocumentFragment replaced by its children.
+       * @type {!Array<!Node>}
+       */
+      var flattenedNodes = [];
 
-    // TODO: Fix this for when one of `nodes` is a DocumentFragment!
-    var connectedBefore = /** @type {!Array<!Node>} */nodes.filter(function (node) {
-      // DocumentFragments are not connected and will not be added to the list.
-      return node instanceof Node && isConnected(node);
-    });
+      /**
+       * Elements in `nodes` that were connected before this call.
+       * @type {!Array<!Node>}
+       */
+      var connectedElements = [];
 
-    builtIn.before.apply(this, nodes);
+      for (var _len = arguments.length, nodes = Array(_len), _key = 0; _key < _len; _key++) {
+        nodes[_key] = arguments[_key];
+      }
 
-    for (var i = 0; i < connectedBefore.length; i++) {
-      internals.disconnectTree(connectedBefore[i]);
-    }
+      for (var i = 0; i < nodes.length; i++) {
+        var node = nodes[i];
 
-    if (isConnected(this)) {
-      for (var _i = 0; _i < nodes.length; _i++) {
-        var node = nodes[_i];
-        if (node instanceof Element) {
-          internals.connectTree(node);
+        if (node instanceof Element && isConnected(node)) {
+          connectedElements.push(node);
+        }
+
+        if (node instanceof DocumentFragment) {
+          for (var child = node.firstChild; child; child = child.nextSibling) {
+            flattenedNodes.push(child);
+          }
+        } else {
+          flattenedNodes.push(node);
         }
       }
-    }
-  };
 
-  /**
-   * @param {...(!Node|string)} nodes
-   */
-  destination['after'] = function () {
-    for (var _len2 = arguments.length, nodes = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
-      nodes[_key2] = arguments[_key2];
-    }
+      builtInMethod.apply(this, nodes);
 
-    // TODO: Fix this for when one of `nodes` is a DocumentFragment!
-    var connectedBefore = /** @type {!Array<!Node>} */nodes.filter(function (node) {
-      // DocumentFragments are not connected and will not be added to the list.
-      return node instanceof Node && isConnected(node);
-    });
+      for (var _i = 0; _i < connectedElements.length; _i++) {
+        internals.disconnectTree(connectedElements[_i]);
+      }
+
+      if (isConnected(this)) {
+        for (var _i2 = 0; _i2 < flattenedNodes.length; _i2++) {
+          var _node = flattenedNodes[_i2];
+          if (_node instanceof Element) {
+            internals.connectTree(_node);
+          }
+        }
+      }
+    };
+  }
 
-    builtIn.after.apply(this, nodes);
+  if (builtIn.before !== undefined) {
+    setPropertyUnchecked(destination, 'before', beforeAfterPatch(builtIn.before));
+  }
 
-    for (var i = 0; i < connectedBefore.length; i++) {
-      internals.disconnectTree(connectedBefore[i]);
-    }
+  if (builtIn.before !== undefined) {
+    setPropertyUnchecked(destination, 'after', beforeAfterPatch(builtIn.after));
+  }
 
-    if (isConnected(this)) {
-      for (var _i2 = 0; _i2 < nodes.length; _i2++) {
-        var node = nodes[_i2];
-        if (node instanceof Element) {
-          internals.connectTree(node);
-        }
+  if (builtIn.replaceWith !== undefined) {
+    setPropertyUnchecked(destination, 'replaceWith',
+    /**
+     * @param {...(!Node|string)} nodes
+     */
+    function () {
+      /**
+       * A copy of `nodes`, with any DocumentFragment replaced by its children.
+       * @type {!Array<!Node>}
+       */
+      var flattenedNodes = [];
+
+      /**
+       * Elements in `nodes` that were connected before this call.
+       * @type {!Array<!Node>}
+       */
+      var connectedElements = [];
+
+      for (var _len2 = arguments.length, nodes = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+        nodes[_key2] = arguments[_key2];
       }
-    }
-  };
 
-  /**
-   * @param {...(!Node|string)} nodes
-   */
-  destination['replaceWith'] = function () {
-    for (var _len3 = arguments.length, nodes = Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
-      nodes[_key3] = arguments[_key3];
-    }
+      for (var i = 0; i < nodes.length; i++) {
+        var node = nodes[i];
 
-    // TODO: Fix this for when one of `nodes` is a DocumentFragment!
-    var connectedBefore = /** @type {!Array<!Node>} */nodes.filter(function (node) {
-      // DocumentFragments are not connected and will not be added to the list.
-      return node instanceof Node && isConnected(node);
-    });
+        if (node instanceof Element && isConnected(node)) {
+          connectedElements.push(node);
+        }
+
+        if (node instanceof DocumentFragment) {
+          for (var child = node.firstChild; child; child = child.nextSibling) {
+            flattenedNodes.push(child);
+          }
+        } else {
+          flattenedNodes.push(node);
+        }
+      }
 
-    var wasConnected = isConnected(this);
+      var wasConnected = isConnected(this);
 
-    builtIn.replaceWith.apply(this, nodes);
+      builtIn.replaceWith.apply(this, nodes);
 
-    for (var i = 0; i < connectedBefore.length; i++) {
-      internals.disconnectTree(connectedBefore[i]);
-    }
+      for (var _i3 = 0; _i3 < connectedElements.length; _i3++) {
+        internals.disconnectTree(connectedElements[_i3]);
+      }
 
-    if (wasConnected) {
-      internals.disconnectTree(this);
-      for (var _i3 = 0; _i3 < nodes.length; _i3++) {
-        var node = nodes[_i3];
-        if (node instanceof Element) {
-          internals.connectTree(node);
+      if (wasConnected) {
+        internals.disconnectTree(this);
+        for (var _i4 = 0; _i4 < flattenedNodes.length; _i4++) {
+          var _node2 = flattenedNodes[_i4];
+          if (_node2 instanceof Element) {
+            internals.connectTree(_node2);
+          }
         }
       }
-    }
-  };
+    });
+  }
 
-  destination['remove'] = function () {
-    var wasConnected = isConnected(this);
+  if (builtIn.remove !== undefined) {
+    setPropertyUnchecked(destination, 'remove', function () {
+      var wasConnected = isConnected(this);
 
-    builtIn.remove.call(this);
+      builtIn.remove.call(this);
 
-    if (wasConnected) {
-      internals.disconnectTree(this);
-    }
-  };
+      if (wasConnected) {
+        internals.disconnectTree(this);
+      }
+    });
+  }
 };
 
 /**
@@ -5244,8 +6528,6 @@ var PatchElement = function (internals) {
       this.__CE_shadowRoot = shadowRoot;
       return shadowRoot;
     });
-  } else {
-    console.warn('Custom Elements: `Element#attachShadow` was not patched.');
   }
 
   function patch_innerHTML(destination, baseDescriptor) {
@@ -5303,9 +6585,6 @@ var PatchElement = function (internals) {
     patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);
   } else {
 
-    /** @type {HTMLDivElement} */
-    var rawDiv = Native.Document_createElement.call(document, 'div');
-
     internals.addPatch(function (element) {
       patch_innerHTML(element, {
         enumerable: true,
@@ -5323,15 +6602,20 @@ var PatchElement = function (internals) {
           // NOTE: re-route to `content` for `template` elements.
           // We need to do this because `template.appendChild` does not
           // route into `template.content`.
+          var isTemplate = this.localName === 'template';
           /** @type {!Node} */
-          var content = this.localName === 'template' ? /** @type {!HTMLTemplateElement} */this.content : this;
-          rawDiv.innerHTML = assignedValue;
+          var content = isTemplate ? /** @type {!HTMLTemplateElement} */
+          this.content : this;
+          /** @type {!Node} */
+          var rawElement = Native.Document_createElement.call(document, this.localName);
+          rawElement.innerHTML = assignedValue;
 
           while (content.childNodes.length > 0) {
             Native.Node_removeChild.call(content, content.childNodes[0]);
           }
-          while (rawDiv.childNodes.length > 0) {
-            Native.Node_appendChild.call(content, rawDiv.childNodes[0]);
+          var container = isTemplate ? rawElement.content : rawElement;
+          while (container.childNodes.length > 0) {
+            Native.Node_appendChild.call(content, container.childNodes[0]);
           }
         }
       });
@@ -5479,6 +6763,7 @@ if (!priorCustomElements || priorCustomElements['forcePolyfill'] || typeof prior
 
   PatchHTMLElement(internals);
   PatchDocument(internals);
+  PatchDocumentFragment(internals);
   PatchNode(internals);
   PatchElement(internals);
 
@@ -5775,7 +7060,9 @@ function calcCssVariables(settings) {
     // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782
     // However, shim css custom properties are only supported with ShadyDOM enabled,
     // so fall back on native if we do not detect ShadyDOM
-    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match('AppleWebKit/601') && window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));
+    // Edge 15: custom properties used in ::before and ::after will also be used in the parent element
+    // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12414257/
+    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match(/AppleWebKit\/601|Edge\/15/) && window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));
   }
 }
 
@@ -5819,6 +7106,46 @@ Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
+/** @type {!Set<string>} */
+
+var styleTextSet = new Set();
+
+var scopingAttribute = 'shady-unscoped';
+
+/**
+ * Add a specifically-marked style to the document directly, and only one copy of that style.
+ *
+ * @param {!HTMLStyleElement} style
+ * @return {undefined}
+ */
+function processUnscopedStyle(style) {
+  var text = style.textContent;
+  if (!styleTextSet.has(text)) {
+    styleTextSet.add(text);
+    var newStyle = style.cloneNode(true);
+    document.head.appendChild(newStyle);
+  }
+}
+
+/**
+ * Check if a style is supposed to be unscoped
+ * @param {!HTMLStyleElement} style
+ * @return {boolean} true if the style has the unscoping attribute
+ */
+function isUnscopedStyle(style) {
+  return style.hasAttribute(scopingAttribute);
+}
+
+/**
+@license
+Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+*/
+
 /**
  * @param {string|StyleNode} rules
  * @param {function(StyleNode)=} callback
@@ -6066,6 +7393,29 @@ function getIsExtends(element) {
   return { is: is, typeExtension: typeExtension };
 }
 
+/**
+ * @param {Element|DocumentFragment} element
+ * @return {string}
+ */
+function gatherStyleText(element) {
+  /** @type {!Array<string>} */
+  var styleTextParts = [];
+  var styles = /** @type {!NodeList<!HTMLStyleElement>} */element.querySelectorAll('style');
+  for (var i = 0; i < styles.length; i++) {
+    var style = styles[i];
+    if (isUnscopedStyle(style)) {
+      if (!nativeShadow) {
+        processUnscopedStyle(style);
+        style.parentNode.removeChild(style);
+      }
+    } else {
+      styleTextParts.push(style.textContent);
+      style.parentNode.removeChild(style);
+    }
+  }
+  return styleTextParts.join('').trim();
+}
+
 /**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
@@ -6261,6 +7611,24 @@ var StyleTransformer = function () {
       return p$.join(COMPLEX_SELECTOR_SEP);
     }
 
+    /**
+     * @param {string} selector
+     * @return {string}
+     */
+
+  }, {
+    key: '_twiddleNthPlus',
+    value: function _twiddleNthPlus(selector) {
+      return selector.replace(NTH, function (m, type, inside) {
+        if (inside.indexOf('+') > -1) {
+          inside = inside.replace(/\+/g, '___');
+        } else if (inside.indexOf('___') > -1) {
+          inside = inside.replace(/___/g, '+');
+        }
+        return ':' + type + '(' + inside + ')';
+      });
+    }
+
     /**
      * @param {string} selector
      * @param {string} scope
@@ -6275,9 +7643,13 @@ var StyleTransformer = function () {
       var stop = false;
       selector = selector.trim();
       // Remove spaces inside of selectors like `:nth-of-type` because it confuses SIMPLE_SELECTOR_SEP
-      selector = selector.replace(NTH, function (m, type, inner) {
-        return ':' + type + '(' + inner.replace(/\s/g, '') + ')';
-      });
+      var isNth = NTH.test(selector);
+      if (isNth) {
+        selector = selector.replace(NTH, function (m, type, inner) {
+          return ':' + type + '(' + inner.replace(/\s/g, '') + ')';
+        });
+        selector = this._twiddleNthPlus(selector);
+      }
       selector = selector.replace(SLOTTED_START, HOST + ' $1');
       selector = selector.replace(SIMPLE_SELECTOR_SEP, function (m, c, s) {
         if (!stop) {
@@ -6288,6 +7660,9 @@ var StyleTransformer = function () {
         }
         return c + s;
       });
+      if (isNth) {
+        selector = this._twiddleNthPlus(selector);
+      }
       return selector;
     }
   }, {
@@ -7005,7 +8380,10 @@ var StyleProperties = function () {
   }, {
     key: '_scopeKeyframes',
     value: function _scopeKeyframes(rule, scopeId) {
-      rule.keyframesNameRx = new RegExp(rule['keyframesName'], 'g');
+      // Animation names are of the form [\w-], so ensure that the name regex does not partially apply
+      // to similarly named keyframe names by checking for a word boundary at the beginning and
+      // a non-word boundary or `-` at the end.
+      rule.keyframesNameRx = new RegExp('\\b' + rule['keyframesName'] + '(?!\\B|-)', 'g');
       rule.transformedKeyframesName = rule['keyframesName'] + '-' + scopeId;
       rule.transformedSelector = rule.transformedSelector || rule['selector'];
       rule['selector'] = rule.transformedSelector.replace(rule['keyframesName'], rule.transformedKeyframesName);
@@ -7278,7 +8656,7 @@ Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
-var flush$1 = function flush() {};
+var flush$2 = function flush() {};
 
 /**
  * @param {HTMLElement} element
@@ -7336,6 +8714,11 @@ function handler(mxns) {
         }
         newScope = getIsExtends(host).is;
         if (currentScope === newScope) {
+          // make sure all the subtree elements are scoped correctly
+          var unscoped = window['ShadyDOM']['nativeMethods']['querySelectorAll'].call(n, ':not(.' + StyleTransformer$1.SCOPE_NAME + ')');
+          for (var j = 0; j < unscoped.length; j++) {
+            StyleTransformer$1.element(unscoped[j], currentScope);
+          }
           continue;
         }
         if (currentScope) {
@@ -7383,7 +8766,7 @@ if (!nativeShadow) {
     }
   }
 
-  flush$1 = function flush() {
+  flush$2 = function flush() {
     handler(observer.takeRecords());
   };
 }
@@ -7831,7 +9214,7 @@ var ScopingShim = function () {
   createClass(ScopingShim, [{
     key: 'flush',
     value: function flush$$1() {
-      flush$1();
+      flush$2();
     }
   }, {
     key: '_generateScopeSelector',
@@ -7852,14 +9235,7 @@ var ScopingShim = function () {
   }, {
     key: '_gatherStyles',
     value: function _gatherStyles(template) {
-      var styles = template.content.querySelectorAll('style');
-      var cssText = [];
-      for (var i = 0; i < styles.length; i++) {
-        var s = styles[i];
-        cssText.push(s.textContent);
-        s.parentNode.removeChild(s);
-      }
-      return cssText.join('').trim();
+      return gatherStyleText(template.content);
     }
   }, {
     key: '_getCssBuild',
@@ -8418,23 +9794,20 @@ if (CustomStyleInterface) {
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
 
-(function () {
-  'use strict';
-  // It's desireable to provide a default stylesheet
-  // that's convenient for styling unresolved elements, but
-  // it's cumbersome to have to include this manually in every page.
-  // It would make sense to put inside some HTMLImport but
-  // the HTMLImports polyfill does not allow loading of stylesheets
-  // that block rendering. Therefore this injection is tolerated here.
-  //
-  // NOTE: position: relative fixes IE's failure to inherit opacity
-  // when a child is not statically positioned.
-
-  var style = document.createElement('style');
-  style.textContent = '' + 'body {' + 'transition: opacity ease-in 0.2s;' + ' } \n' + 'body[unresolved] {' + 'opacity: 0; display: block; overflow: hidden; position: relative;' + ' } \n';
-  var head = document.querySelector('head');
-  head.insertBefore(style, head.firstChild);
-})();
+// It's desireable to provide a default stylesheet
+// that's convenient for styling unresolved elements, but
+// it's cumbersome to have to include this manually in every page.
+// It would make sense to put inside some HTMLImport but
+// the HTMLImports polyfill does not allow loading of stylesheets
+// that block rendering. Therefore this injection is tolerated here.
+//
+// NOTE: position: relative fixes IE's failure to inherit opacity
+// when a child is not statically positioned.
+
+var style = document.createElement('style');
+style.textContent = '' + 'body {' + 'transition: opacity ease-in 0.2s;' + ' } \n' + 'body[unresolved] {' + 'opacity: 0; display: block; overflow: hidden; position: relative;' + ' } \n';
+var head = document.querySelector('head');
+head.insertBefore(style, head.firstChild);
 
 /*
  *  @license
diff --git a/dist/web-component-polyfills.js.map b/dist/web-component-polyfills.js.map
index b08c2e8..3b9c064 100644
--- a/dist/web-component-polyfills.js.map
+++ b/dist/web-component-polyfills.js.map
@@ -1 +1 @@
-{"version":3,"file":"web-component-polyfills.js","sources":["../node_modules/webcomponents-platform/webcomponents-platform.js","../node_modules/@webcomponents/template/template.js","../node_modules/es6-promise/dist/es6-promise.auto.min.js","../node_modules/webcomponents.js/src/pre-polyfill.js","../node_modules/@webcomponents/shadydom/src/utils.js","../node_modules/@webcomponents/shadydom/src/flush.js","../node_modules/@webcomponents/shadydom/src/observe-changes.js","../node_modules/@webcomponents/shadydom/src/native-methods.js","../node_modules/@webcomponents/shadydom/src/innerHTML.js","../node_modules/@webcomponents/shadydom/src/native-tree.js","../node_modules/@webcomponents/shadydom/src/patch-accessors.js","../node_modules/@webcomponents/shadydom/src/logical-tree.js","../node_modules/@webcomponents/shadydom/src/logical-mutation.js","../node_modules/@webcomponents/shadydom/src/patch-events.js","../node_modules/@webcomponents/shadydom/src/array-splice.js","../node_modules/@webcomponents/shadydom/src/attach-shadow.js","../node_modules/@webcomponents/shadydom/src/patch-builtins.js","../node_modules/@webcomponents/shadydom/src/shadydom.js","../node_modules/@webcomponents/custom-elements/src/Utilities.js","../node_modules/@webcomponents/custom-elements/src/CustomElementState.js","../node_modules/@webcomponents/custom-elements/src/CustomElementInternals.js","../node_modules/@webcomponents/custom-elements/src/DocumentConstructionObserver.js","../node_modules/@webcomponents/custom-elements/src/Deferred.js","../node_modules/@webcomponents/custom-elements/src/CustomElementRegistry.js","../node_modules/@webcomponents/custom-elements/src/Patch/Native.js","../node_modules/@webcomponents/custom-elements/src/AlreadyConstructedMarker.js","../node_modules/@webcomponents/custom-elements/src/Patch/HTMLElement.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ParentNode.js","../node_modules/@webcomponents/custom-elements/src/Patch/Document.js","../node_modules/@webcomponents/custom-elements/src/Patch/Node.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ChildNode.js","../node_modules/@webcomponents/custom-elements/src/Patch/Element.js","../node_modules/@webcomponents/custom-elements/src/custom-elements.js","../node_modules/@webcomponents/shadycss/src/css-parse.js","../node_modules/@webcomponents/shadycss/src/style-settings.js","../node_modules/@webcomponents/shadycss/src/common-regex.js","../node_modules/@webcomponents/shadycss/src/style-util.js","../node_modules/@webcomponents/shadycss/src/style-transformer.js","../node_modules/@webcomponents/shadycss/src/style-info.js","../node_modules/@webcomponents/shadycss/src/style-properties.js","../node_modules/@webcomponents/shadycss/src/style-placeholder.js","../node_modules/@webcomponents/shadycss/src/style-cache.js","../node_modules/@webcomponents/shadycss/src/document-watcher.js","../node_modules/@webcomponents/shadycss/src/template-map.js","../node_modules/@webcomponents/shadycss/src/apply-shim-utils.js","../node_modules/@webcomponents/shadycss/src/document-wait.js","../node_modules/@webcomponents/shadycss/src/common-utils.js","../node_modules/@webcomponents/shadycss/src/custom-style-interface.js","../node_modules/@webcomponents/shadycss/src/scoping-shim.js","../node_modules/@webcomponents/shadycss/entrypoints/scoping-shim.js","../node_modules/webcomponents.js/src/unresolved.js","../bundles/bundle-all.js"],"sourcesContent":["/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function(scope) {\n\n  'use strict';\n\n  // defaultPrevented is broken in IE.\n  // https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called\n  var workingDefaultPrevented = (function() {\n    var e = document.createEvent('Event');\n    e.initEvent('foo', true, true);\n    e.preventDefault();\n    return e.defaultPrevented;\n  })();\n\n  if (!workingDefaultPrevented) {\n    var origPreventDefault = Event.prototype.preventDefault;\n    Event.prototype.preventDefault = function() {\n      if (!this.cancelable) {\n        return;\n      }\n\n      origPreventDefault.call(this);\n\n      Object.defineProperty(this, 'defaultPrevented', {\n        get: function() {\n          return true;\n        },\n        configurable: true\n      });\n    };\n  }\n\n  var isIE = /Trident/.test(navigator.userAgent);\n\n  // CustomEvent constructor shim\n  if (!window.CustomEvent || isIE && (typeof window.CustomEvent !== 'function')) {\n    window.CustomEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('CustomEvent');\n      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);\n      return e;\n    };\n    window.CustomEvent.prototype = window.Event.prototype;\n  }\n\n  // Event constructor shim\n  if (!window.Event || isIE && (typeof window.Event !== 'function')) {\n    var origEvent = window.Event;\n    window.Event = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('Event');\n      e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));\n      return e;\n    };\n    if (origEvent) {\n      for (var i in origEvent) {\n        window.Event[i] = origEvent[i];\n      }\n    }\n    window.Event.prototype = origEvent.prototype;\n  }\n\n  if (!window.MouseEvent || isIE && (typeof window.MouseEvent !== 'function')) {\n    var origMouseEvent = window.MouseEvent;\n    window.MouseEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('MouseEvent');\n      e.initMouseEvent(inType,\n        Boolean(params.bubbles), Boolean(params.cancelable),\n        params.view || window, params.detail,\n        params.screenX, params.screenY, params.clientX, params.clientY,\n        params.ctrlKey, params.altKey, params.shiftKey, params.metaKey,\n        params.button, params.relatedTarget);\n      return e;\n    };\n    if (origMouseEvent) {\n      for (var i in origMouseEvent) {\n        window.MouseEvent[i] = origMouseEvent[i];\n      }\n    }\n    window.MouseEvent.prototype = origMouseEvent.prototype;\n  }\n\n  // ES6 stuff\n  if (!Array.from) {\n    Array.from = function (object) {\n      return [].slice.call(object);\n    };\n  }\n\n  if (!Object.assign) {\n    var assign = function(target, source) {\n      var n$ = Object.getOwnPropertyNames(source);\n      for (var i=0, p; i < n$.length; i++) {\n        p = n$[i];\n        target[p] = source[p];\n      }\n    }\n\n    Object.assign = function(target, sources) {\n      var args = [].slice.call(arguments, 1);\n      for (var i=0, s; i < args.length; i++) {\n        s = args[i];\n        if (s) {\n          assign(target, s);\n        }\n      }\n      return target;\n    }\n  }\n\n})(window.WebComponents);\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n// minimal template polyfill\n(function() {\n\n  var needsTemplate = (typeof HTMLTemplateElement === 'undefined');\n\n  // NOTE: Patch document.importNode to work around IE11 bug that\n  // casues children of a document fragment imported while\n  // there is a mutation observer to not have a parentNode (!?!)\n  // It's important that this is the first patch to `importNode` so that\n  // dom produced for later patches is correct.\n  if (/Trident/.test(navigator.userAgent)) {\n    (function() {\n      var Native_importNode = Document.prototype.importNode;\n      Document.prototype.importNode = function() {\n        var n = Native_importNode.apply(this, arguments);\n        // Copy all children to a new document fragment since\n        // this one may be broken\n        if (n.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n          var f = this.createDocumentFragment();\n          f.appendChild(n);\n          return f;\n        } else {\n          return n;\n        }\n      };\n    })();\n  }\n\n  // NOTE: we rely on this cloneNode not causing element upgrade.\n  // This means this polyfill must load before the CE polyfill and\n  // this would need to be re-worked if a browser supports native CE\n  // but not <template>.\n  var Native_cloneNode = Node.prototype.cloneNode;\n  var Native_createElement = Document.prototype.createElement;\n  var Native_importNode = Document.prototype.importNode;\n\n  // returns true if nested templates cannot be cloned (they cannot be on\n  // some impl's like Safari 8 and Edge)\n  // OR if cloning a document fragment does not result in a document fragment\n  var needsCloning = (function() {\n    if (!needsTemplate) {\n      var t = document.createElement('template');\n      var t2 = document.createElement('template');\n      t2.content.appendChild(document.createElement('div'));\n      t.content.appendChild(t2);\n      var clone = t.cloneNode(true);\n      return (clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0\n        || !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment));\n    }\n  })();\n\n  var TEMPLATE_TAG = 'template';\n  var PolyfilledHTMLTemplateElement = function() {};\n\n  if (needsTemplate) {\n\n    var contentDoc = document.implementation.createHTMLDocument('template');\n    var canDecorate = true;\n\n    var templateStyle = document.createElement('style');\n    templateStyle.textContent = TEMPLATE_TAG + '{display:none;}';\n\n    var head = document.head;\n    head.insertBefore(templateStyle, head.firstElementChild);\n\n    /**\n      Provides a minimal shim for the <template> element.\n    */\n    PolyfilledHTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);\n\n\n    // if elements do not have `innerHTML` on instances, then\n    // templates can be patched by swizzling their prototypes.\n    var canProtoPatch =\n      !(document.createElement('div').hasOwnProperty('innerHTML'));\n\n    /**\n      The `decorate` method moves element children to the template's `content`.\n      NOTE: there is no support for dynamically adding elements to templates.\n    */\n    PolyfilledHTMLTemplateElement.decorate = function(template) {\n      // if the template is decorated, return fast\n      if (template.content) {\n        return;\n      }\n      template.content = contentDoc.createDocumentFragment();\n      var child;\n      while (child = template.firstChild) {\n        template.content.appendChild(child);\n      }\n      // NOTE: prefer prototype patching for performance and\n      // because on some browsers (IE11), re-defining `innerHTML`\n      // can result in intermittent errors.\n      if (canProtoPatch) {\n        template.__proto__ = PolyfilledHTMLTemplateElement.prototype;\n      } else {\n        template.cloneNode = function(deep) {\n          return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n        };\n        // add innerHTML to template, if possible\n        // Note: this throws on Safari 7\n        if (canDecorate) {\n          try {\n            defineInnerHTML(template);\n          } catch (err) {\n            canDecorate = false;\n          }\n        }\n      }\n      // bootstrap recursively\n      PolyfilledHTMLTemplateElement.bootstrap(template.content);\n    };\n\n    function defineInnerHTML(obj) {\n      Object.defineProperty(obj, 'innerHTML', {\n        get: function() {\n          var o = '';\n          for (var e = this.content.firstChild; e; e = e.nextSibling) {\n            o += e.outerHTML || escapeData(e.data);\n          }\n          return o;\n        },\n        set: function(text) {\n          contentDoc.body.innerHTML = text;\n          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);\n          while (this.content.firstChild) {\n            this.content.removeChild(this.content.firstChild);\n          }\n          while (contentDoc.body.firstChild) {\n            this.content.appendChild(contentDoc.body.firstChild);\n          }\n        },\n        configurable: true\n      });\n    }\n\n    defineInnerHTML(PolyfilledHTMLTemplateElement.prototype);\n\n    /**\n      The `bootstrap` method is called automatically and \"fixes\" all\n      <template> elements in the document referenced by the `doc` argument.\n    */\n    PolyfilledHTMLTemplateElement.bootstrap = function(doc) {\n      var templates = doc.querySelectorAll(TEMPLATE_TAG);\n      for (var i=0, l=templates.length, t; (i<l) && (t=templates[i]); i++) {\n        PolyfilledHTMLTemplateElement.decorate(t);\n      }\n    };\n\n    // auto-bootstrapping for main document\n    document.addEventListener('DOMContentLoaded', function() {\n      PolyfilledHTMLTemplateElement.bootstrap(document);\n    });\n\n    // Patch document.createElement to ensure newly created templates have content\n    Document.prototype.createElement = function() {\n      'use strict';\n      var el = Native_createElement.apply(this, arguments);\n      if (el.localName === 'template') {\n        PolyfilledHTMLTemplateElement.decorate(el);\n      }\n      return el;\n    };\n\n    var escapeDataRegExp = /[&\\u00A0<>]/g;\n\n    function escapeReplace(c) {\n      switch (c) {\n        case '&':\n          return '&amp;';\n        case '<':\n          return '&lt;';\n        case '>':\n          return '&gt;';\n        case '\\u00A0':\n          return '&nbsp;';\n      }\n    }\n\n    function escapeData(s) {\n      return s.replace(escapeDataRegExp, escapeReplace);\n    }\n  }\n\n  // make cloning/importing work!\n  if (needsTemplate || needsCloning) {\n\n    PolyfilledHTMLTemplateElement._cloneNode = function(template, deep) {\n      var clone = Native_cloneNode.call(template, false);\n      // NOTE: decorate doesn't auto-fix children because they are already\n      // decorated so they need special clone fixup.\n      if (this.decorate) {\n        this.decorate(clone);\n      }\n      if (deep) {\n        // NOTE: use native clone node to make sure CE's wrapped\n        // cloneNode does not cause elements to upgrade.\n        clone.content.appendChild(\n            Native_cloneNode.call(template.content, true));\n        // now ensure nested templates are cloned correctly.\n        this.fixClonedDom(clone.content, template.content);\n      }\n      return clone;\n    };\n\n    PolyfilledHTMLTemplateElement.prototype.cloneNode = function(deep) {\n      return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n    }\n\n    // Given a source and cloned subtree, find <template>'s in the cloned\n    // subtree and replace them with cloned <template>'s from source.\n    // We must do this because only the source templates have proper .content.\n    PolyfilledHTMLTemplateElement.fixClonedDom = function(clone, source) {\n      // do nothing if cloned node is not an element\n      if (!source.querySelectorAll) return;\n      // these two lists should be coincident\n      var s$ = source.querySelectorAll(TEMPLATE_TAG);\n      var t$ = clone.querySelectorAll(TEMPLATE_TAG);\n      for (var i=0, l=t$.length, t, s; i<l; i++) {\n        s = s$[i];\n        t = t$[i];\n        if (this.decorate) {\n          this.decorate(s);\n        }\n        t.parentNode.replaceChild(s.cloneNode(true), t);\n      }\n    };\n\n    // override all cloning to fix the cloned subtree to contain properly\n    // cloned templates.\n    Node.prototype.cloneNode = function(deep) {\n      var dom;\n      // workaround for Edge bug cloning documentFragments\n      // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8619646/\n      if (this instanceof DocumentFragment) {\n        if (!deep) {\n          return this.ownerDocument.createDocumentFragment();\n        } else {\n          dom = this.ownerDocument.importNode(this, true);\n        }\n      } else {\n        dom = Native_cloneNode.call(this, deep);\n      }\n      // template.content is cloned iff `deep`.\n      if (deep) {\n        PolyfilledHTMLTemplateElement.fixClonedDom(dom, this);\n      }\n      return dom;\n    };\n\n    // NOTE: we are cloning instead of importing <template>'s.\n    // However, the ownerDocument of the cloned template will be correct!\n    // This is because the native import node creates the right document owned\n    // subtree and `fixClonedDom` inserts cloned templates into this subtree,\n    // thus updating the owner doc.\n    Document.prototype.importNode = function(element, deep) {\n      if (element.localName === TEMPLATE_TAG) {\n        return PolyfilledHTMLTemplateElement._cloneNode(element, deep);\n      } else {\n        var dom = Native_importNode.call(this, element, deep);\n        if (deep) {\n          PolyfilledHTMLTemplateElement.fixClonedDom(dom, element);\n        }\n        return dom;\n      }\n    };\n\n    if (needsCloning) {\n      window.HTMLTemplateElement.prototype.cloneNode = function(deep) {\n        return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n      };\n    }\n  }\n\n  if (needsTemplate) {\n    window.HTMLTemplateElement = PolyfilledHTMLTemplateElement;\n  }\n\n})();\n","!function(t,e){\"object\"==typeof exports&&\"undefined\"!=typeof module?module.exports=e():\"function\"==typeof define&&define.amd?define(e):t.ES6Promise=e()}(this,function(){\"use strict\";function t(t){var e=typeof t;return null!==t&&(\"object\"===e||\"function\"===e)}function e(t){return\"function\"==typeof t}function n(t){I=t}function r(t){J=t}function o(){return function(){return 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All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function() {\n\n  'use strict';\n\n  // Establish scope.\n  window['WebComponents'] = window['WebComponents'] || {'flags':{}};\n\n  // loading script\n  var file = 'webcomponents-lite.js';\n  var script = document.querySelector('script[src*=\"' + file + '\"]');\n  var flagMatcher = /wc-(.+)/;\n\n  // Flags. Convert url arguments to flags\n  var flags = {};\n  if (!flags['noOpts']) {\n    // from url\n    location.search.slice(1).split('&').forEach(function(option) {\n      var parts = option.split('=');\n      var match;\n      if (parts[0] && (match = parts[0].match(flagMatcher))) {\n        flags[match[1]] = parts[1] || true;\n      }\n    });\n    // from script\n    if (script) {\n      for (var i=0, a; (a=script.attributes[i]); i++) {\n        if (a.name !== 'src') {\n          flags[a.name] = a.value || true;\n        }\n      }\n    }\n    // log flags\n    if (flags['log'] && flags['log']['split']) {\n      var parts = flags['log'].split(',');\n      flags['log'] = {};\n      parts.forEach(function(f) {\n        flags['log'][f] = true;\n      });\n    } else {\n      flags['log'] = {};\n    }\n  }\n\n  // exports\n  window['WebComponents']['flags'] = flags;\n  var forceShady = flags['shadydom'];\n  if (forceShady) {\n    window['ShadyDOM'] = window['ShadyDOM'] || {};\n    window['ShadyDOM']['force'] = forceShady;\n  }\n\n  var forceCE = flags['register'] || flags['ce'];\n  if (forceCE && window['customElements']) {\n    window['customElements']['forcePolyfill'] = forceCE;\n  }\n\n})();\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let settings = window['ShadyDOM'] || {};\n\nsettings.hasNativeShadowDOM = Boolean(Element.prototype.attachShadow && Node.prototype.getRootNode);\n\nlet desc = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild');\n\nsettings.hasDescriptors = Boolean(desc && desc.configurable && desc.get);\nsettings.inUse = settings['force'] || !settings.hasNativeShadowDOM;\n\nexport function isTrackingLogicalChildNodes(node) {\n  return (node.__shady && node.__shady.firstChild !== undefined);\n}\n\nexport function isShadyRoot(obj) {\n  return Boolean(obj.__localName === 'ShadyRoot');\n}\n\nexport function ownerShadyRootForNode(node) {\n  let root = node.getRootNode();\n  if (isShadyRoot(root)) {\n    return root;\n  }\n}\n\nlet p = Element.prototype;\nlet matches = p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\n  p.oMatchesSelector || p.webkitMatchesSelector;\n\nexport function matchesSelector(element, selector) {\n  return matches.call(element, selector);\n}\n\nfunction copyOwnProperty(name, source, target) {\n  let pd = Object.getOwnPropertyDescriptor(source, name);\n  if (pd) {\n    Object.defineProperty(target, name, pd);\n  }\n}\n\nexport function extend(target, source) {\n  if (target && source) {\n    let n$ = Object.getOwnPropertyNames(source);\n    for (let i=0, n; (i<n$.length) && (n=n$[i]); i++) {\n      copyOwnProperty(n, source, target);\n    }\n  }\n  return target || source;\n}\n\nexport function extendAll(target, ...sources) {\n  for (let i=0; i < sources.length; i++) {\n    extend(target, sources[i]);\n  }\n  return target;\n}\n\nexport function mixin(target, source) {\n  for (var i in source) {\n    target[i] = source[i];\n  }\n  return target;\n}\n\nexport function patchPrototype(obj, mixin) {\n  let proto = Object.getPrototypeOf(obj);\n  if (!proto.hasOwnProperty('__patchProto')) {\n    let patchProto = Object.create(proto);\n    patchProto.__sourceProto = proto;\n    extend(patchProto, mixin);\n    proto['__patchProto'] = patchProto;\n  }\n  // old browsers don't have setPrototypeOf\n  obj.__proto__ = proto['__patchProto'];\n}\n\n\nlet twiddle = document.createTextNode('');\nlet content = 0;\nlet queue = [];\nnew MutationObserver(() => {\n  while (queue.length) {\n    // catch errors in user code...\n    try {\n      queue.shift()();\n    } catch(e) {\n      // enqueue another record and throw\n      twiddle.textContent = content++;\n      throw(e);\n    }\n  }\n}).observe(twiddle, {characterData: true});\n\n// use MutationObserver to get microtask async timing.\nexport function microtask(callback) {\n  queue.push(callback);\n  twiddle.textContent = content++;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\n// render enqueuer/flusher\nlet flushList = [];\nlet scheduled;\nexport function enqueue(callback) {\n  if (!scheduled) {\n    scheduled = true;\n    utils.microtask(flush);\n  }\n  flushList.push(callback);\n}\n\nexport function flush() {\n  scheduled = false;\n  let didFlush = Boolean(flushList.length);\n  while (flushList.length) {\n    flushList.shift()();\n  }\n  return didFlush;\n}\n\nflush['list'] = flushList;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\nclass AsyncObserver {\n\n  constructor() {\n    this._scheduled = false;\n    this.addedNodes = [];\n    this.removedNodes = [];\n    this.callbacks = new Set();\n  }\n\n  schedule() {\n    if (!this._scheduled) {\n      this._scheduled = true;\n      utils.microtask(() => {\n        this.flush();\n      });\n    }\n  }\n\n  flush() {\n    if (this._scheduled) {\n      this._scheduled = false;\n      let mutations = this.takeRecords();\n      if (mutations.length) {\n        this.callbacks.forEach(function(cb) {\n          cb(mutations);\n        });\n      }\n    }\n  }\n\n  takeRecords() {\n    if (this.addedNodes.length || this.removedNodes.length) {\n      let mutations = [{\n        addedNodes: this.addedNodes,\n        removedNodes: this.removedNodes\n      }];\n      this.addedNodes = [];\n      this.removedNodes = [];\n      return mutations;\n    }\n    return [];\n  }\n\n}\n\n// TODO(sorvell): consider instead polyfilling MutationObserver\n// directly so that users do not have to fork their code.\n// Supporting the entire api may be challenging: e.g. filtering out\n// removed nodes in the wrong scope and seeing non-distributing\n// subtree child mutations.\nexport let observeChildren = function(node, callback) {\n  node.__shady = node.__shady || {};\n  if (!node.__shady.observer) {\n    node.__shady.observer = new AsyncObserver();\n  }\n  node.__shady.observer.callbacks.add(callback);\n  let observer = node.__shady.observer;\n  return {\n    _callback: callback,\n    _observer: observer,\n    _node: node,\n    takeRecords() {\n      return observer.takeRecords()\n    }\n  };\n}\n\nexport let unobserveChildren = function(handle) {\n  let observer = handle && handle._observer;\n  if (observer) {\n    observer.callbacks.delete(handle._callback);\n    if (!observer.callbacks.size) {\n      handle._node.__shady.observer = null;\n    }\n  }\n}\n\nexport function filterMutations(mutations, target) {\n  /** @const {Node} */\n  const targetRootNode = target.getRootNode();\n  return mutations.map(function(mutation) {\n    /** @const {boolean} */\n    const mutationInScope = (targetRootNode === mutation.target.getRootNode());\n    if (mutationInScope && mutation.addedNodes) {\n      let nodes = Array.from(mutation.addedNodes).filter(function(n) {\n        return (targetRootNode === n.getRootNode());\n      });\n      if (nodes.length) {\n        mutation = Object.create(mutation);\n        Object.defineProperty(mutation, 'addedNodes', {\n          value: nodes,\n          configurable: true\n        });\n        return mutation;\n      }\n    } else if (mutationInScope) {\n      return mutation;\n    }\n  }).filter(function(m) { return m});\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let appendChild = Element.prototype.appendChild;\nexport let insertBefore = Element.prototype.insertBefore;\nexport let removeChild = Element.prototype.removeChild;\nexport let setAttribute = Element.prototype.setAttribute;\nexport let removeAttribute = Element.prototype.removeAttribute;\nexport let cloneNode = Element.prototype.cloneNode;\nexport let importNode = Document.prototype.importNode;\nexport let addEventListener = Element.prototype.addEventListener;\nexport let removeEventListener = Element.prototype.removeEventListener;\nexport let windowAddEventListener = Window.prototype.addEventListener;\nexport let windowRemoveEventListener = Window.prototype.removeEventListener;\nexport let dispatchEvent = Element.prototype.dispatchEvent;\nexport let querySelector = Element.prototype.querySelector;\nexport let querySelectorAll = Element.prototype.querySelectorAll;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n// Cribbed from ShadowDOM polyfill\n// https://github.com/webcomponents/webcomponentsjs/blob/master/src/ShadowDOM/wrappers/HTMLElement.js#L28\n/////////////////////////////////////////////////////////////////////////////\n// innerHTML and outerHTML\n\n// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString\nlet escapeAttrRegExp = /[&\\u00A0\"]/g;\nlet escapeDataRegExp = /[&\\u00A0<>]/g;\n\nfunction escapeReplace(c) {\n  switch (c) {\n    case '&':\n      return '&amp;';\n    case '<':\n      return '&lt;';\n    case '>':\n      return '&gt;';\n    case '\"':\n      return '&quot;';\n    case '\\u00A0':\n      return '&nbsp;';\n  }\n}\n\nfunction escapeAttr(s) {\n  return s.replace(escapeAttrRegExp, escapeReplace);\n}\n\nfunction escapeData(s) {\n  return s.replace(escapeDataRegExp, escapeReplace);\n}\n\nfunction makeSet(arr) {\n  let set = {};\n  for (let i = 0; i < arr.length; i++) {\n    set[arr[i]] = true;\n  }\n  return set;\n}\n\n// http://www.whatwg.org/specs/web-apps/current-work/#void-elements\nlet voidElements = makeSet([\n  'area',\n  'base',\n  'br',\n  'col',\n  'command',\n  'embed',\n  'hr',\n  'img',\n  'input',\n  'keygen',\n  'link',\n  'meta',\n  'param',\n  'source',\n  'track',\n  'wbr'\n]);\n\nlet plaintextParents = makeSet([\n  'style',\n  'script',\n  'xmp',\n  'iframe',\n  'noembed',\n  'noframes',\n  'plaintext',\n  'noscript'\n]);\n\n/**\n * @param {Node} node\n * @param {Node} parentNode\n * @param {Function=} callback\n */\nexport function getOuterHTML(node, parentNode, callback) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE: {\n      let tagName = node.localName;\n      let s = '<' + tagName;\n      let attrs = node.attributes;\n      for (let i = 0, attr; (attr = attrs[i]); i++) {\n        s += ' ' + attr.name + '=\"' + escapeAttr(attr.value) + '\"';\n      }\n      s += '>';\n      if (voidElements[tagName]) {\n        return s;\n      }\n      return s + getInnerHTML(node, callback) + '</' + tagName + '>';\n    }\n    case Node.TEXT_NODE: {\n      let data = /** @type {Text} */ (node).data;\n      if (parentNode && plaintextParents[parentNode.localName]) {\n        return data;\n      }\n      return escapeData(data);\n    }\n    case Node.COMMENT_NODE: {\n      return '<!--' + /** @type {Comment} */ (node).data + '-->';\n    }\n    default: {\n      window.console.error(node);\n      throw new Error('not implemented');\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Function=} callback\n */\nexport function getInnerHTML(node, callback) {\n  if (node.localName === 'template') {\n    node =  /** @type {HTMLTemplateElement} */ (node).content;\n  }\n  let s = '';\n  let c$ = callback ? callback(node) : node.childNodes;\n  for (let i=0, l=c$.length, child; (i<l) && (child=c$[i]); i++) {\n    s += getOuterHTML(child, node, callback);\n  }\n  return s;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {getInnerHTML} from './innerHTML.js';\n\nlet nodeWalker = document.createTreeWalker(document, NodeFilter.SHOW_ALL,\n  null, false);\n\nlet elementWalker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT,\n  null, false);\n\nexport function parentNode(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.parentNode();\n}\n\nexport function firstChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.firstChild();\n}\n\nexport function lastChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.lastChild();\n}\n\nexport function previousSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.previousSibling();\n}\n\nexport function nextSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.nextSibling();\n}\n\nexport function childNodes(node) {\n  let nodes = [];\n  nodeWalker.currentNode = node;\n  let n = nodeWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = nodeWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function parentElement(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.parentNode();\n}\n\nexport function firstElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.firstChild();\n}\n\nexport function lastElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.lastChild();\n}\n\nexport function previousElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.previousSibling();\n}\n\nexport function nextElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.nextSibling();\n}\n\nexport function children(node) {\n  let nodes = [];\n  elementWalker.currentNode = node;\n  let n = elementWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = elementWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function innerHTML(node) {\n  return getInnerHTML(node, (n) => childNodes(n));\n}\n\nexport function textContent(node) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE:\n    case Node.DOCUMENT_FRAGMENT_NODE:\n      let textWalker = document.createTreeWalker(node, NodeFilter.SHOW_TEXT,\n        null, false);\n      let content = '', n;\n      while ( (n = textWalker.nextNode()) ) {\n        // TODO(sorvell): can't use textContent since we patch it on Node.prototype!\n        // However, should probably patch it only on element.\n        content += n.nodeValue;\n      }\n      return content;\n    default:\n      return node.nodeValue;\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {getInnerHTML} from './innerHTML.js';\nimport * as nativeTree from './native-tree.js';\n\nfunction clearNode(node) {\n  while (node.firstChild) {\n    node.removeChild(node.firstChild);\n  }\n}\n\nconst nativeInnerHTMLDesc = /** @type {ObjectPropertyDescriptor} */(\n  Object.getOwnPropertyDescriptor(Element.prototype, 'innerHTML') ||\n  Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerHTML'));\n\nconst inertDoc = document.implementation.createHTMLDocument('inert');\nconst htmlContainer = inertDoc.createElement('div');\n\nconst nativeActiveElementDescriptor =\n  /** @type {ObjectPropertyDescriptor} */(\n    Object.getOwnPropertyDescriptor(Document.prototype, 'activeElement')\n  );\nfunction getDocumentActiveElement() {\n  if (nativeActiveElementDescriptor && nativeActiveElementDescriptor.get) {\n    return nativeActiveElementDescriptor.get.call(document);\n  } else if (!utils.settings.hasDescriptors) {\n    return document.activeElement;\n  }\n}\n\nfunction activeElementForNode(node) {\n  let active = getDocumentActiveElement();\n  // In IE11, activeElement might be an empty object if the document is\n  // contained in an iframe.\n  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10998788/\n  if (!active || !active.nodeType) {\n    return null;\n  }\n  let isShadyRoot = !!(utils.isShadyRoot(node));\n  if (node !== document) {\n    // If this node isn't a document or shady root, then it doesn't have\n    // an active element.\n    if (!isShadyRoot) {\n      return null;\n    }\n    // If this shady root's host is the active element or the active\n    // element is not a descendant of the host (in the composed tree),\n    // then it doesn't have an active element.\n    if (node.host === active ||\n        !node.host.contains(active)) {\n      return null;\n    }\n  }\n  // This node is either the document or a shady root of which the active\n  // element is a (composed) descendant of its host; iterate upwards to\n  // find the active element's most shallow host within it.\n  let activeRoot = utils.ownerShadyRootForNode(active);\n  while (activeRoot && activeRoot !== node) {\n    active = activeRoot.host;\n    activeRoot = utils.ownerShadyRootForNode(active);\n  }\n  if (node === document) {\n    // This node is the document, so activeRoot should be null.\n    return activeRoot ? null : active;\n  } else {\n    // This node is a non-document shady root, and it should be\n    // activeRoot.\n    return activeRoot === node ? active : null;\n  }\n}\n\nlet OutsideAccessors = {\n\n  parentElement: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      if (l && l.nodeType !== Node.ELEMENT_NODE) {\n        l = null;\n      }\n      return l !== undefined ? l : nativeTree.parentElement(this);\n    },\n    configurable: true\n  },\n\n  parentNode: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      return l !== undefined ? l : nativeTree.parentNode(this);\n    },\n    configurable: true\n  },\n\n  nextSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.nextSibling;\n      return l !== undefined ? l : nativeTree.nextSibling(this);\n    },\n    configurable: true\n  },\n\n  previousSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.previousSibling;\n      return l !== undefined ? l : nativeTree.previousSibling(this);\n    },\n    configurable: true\n  },\n\n  className: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.getAttribute('class') || '';\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(value) {\n      this.setAttribute('class', value);\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  nextElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.nextSibling !== undefined) {\n        let n = this.nextSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.nextElementSibling(this);\n      }\n    },\n    configurable: true\n  },\n\n  previousElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.previousSibling !== undefined) {\n        let n = this.previousSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.previousElementSibling(this);\n      }\n    },\n    configurable: true\n  }\n\n};\n\nlet InsideAccessors = {\n\n  childNodes: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let childNodes;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        if (!this.__shady.childNodes) {\n          this.__shady.childNodes = [];\n          for (let n=this.firstChild; n; n=n.nextSibling) {\n            this.__shady.childNodes.push(n);\n          }\n        }\n        childNodes = this.__shady.childNodes;\n      } else {\n        childNodes = nativeTree.childNodes(this);\n      }\n      childNodes.item = function(index) {\n        return childNodes[index];\n      }\n      return childNodes;\n    },\n    configurable: true\n  },\n\n  childElementCount: {\n    /** @this {HTMLElement} */\n    get() {\n      return this.children.length;\n    },\n    configurable: true\n  },\n\n  firstChild: {\n    /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.firstChild;\n      return l !== undefined ? l : nativeTree.firstChild(this);\n    },\n    configurable: true\n  },\n\n  lastChild: {\n  /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.lastChild;\n      return l !== undefined ? l : nativeTree.lastChild(this);\n    },\n    configurable: true\n  },\n\n  textContent: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        let tc = [];\n        for (let i = 0, cn = this.childNodes, c; (c = cn[i]); i++) {\n          if (c.nodeType !== Node.COMMENT_NODE) {\n            tc.push(c.textContent);\n          }\n        }\n        return tc.join('');\n      } else {\n        return nativeTree.textContent(this);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     * @param {string} text\n     */\n    set(text) {\n      switch (this.nodeType) {\n        case Node.ELEMENT_NODE:\n        case Node.DOCUMENT_FRAGMENT_NODE:\n          clearNode(this);\n          this.appendChild(document.createTextNode(text));\n          break;\n        default:\n          // TODO(sorvell): can't do this if patch nodeValue.\n          this.nodeValue = text;\n          break;\n      }\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  firstElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.firstChild !== undefined) {\n        let n = this.firstChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.firstElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  lastElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.lastChild !== undefined) {\n        let n = this.lastChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.lastElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  children: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let children;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        children = Array.prototype.filter.call(this.childNodes, function(n) {\n          return (n.nodeType === Node.ELEMENT_NODE);\n        });\n      } else {\n        children = nativeTree.children(this);\n      }\n      children.item = function(index) {\n        return children[index];\n      }\n      return children;\n    },\n    configurable: true\n  },\n\n  // element (HTMLElement on IE11)\n  innerHTML: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        return getInnerHTML(content);\n      } else {\n        return nativeTree.innerHTML(content);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(text) {\n      let content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      clearNode(content);\n      if (nativeInnerHTMLDesc && nativeInnerHTMLDesc.set) {\n        nativeInnerHTMLDesc.set.call(htmlContainer, text);\n      } else {\n        htmlContainer.innerHTML = text;\n      }\n      while (htmlContainer.firstChild) {\n        content.appendChild(htmlContainer.firstChild);\n      }\n    },\n    configurable: true\n  }\n\n};\n\n// Note: Can be patched on element prototype on all browsers.\n// Must be patched on instance on browsers that support native Shadow DOM\n// but do not have builtin accessors (old Chrome).\nexport let ShadowRootAccessor = {\n\n  shadowRoot: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.__shady && this.__shady.publicRoot || null;\n    },\n    configurable: true\n  }\n};\n\n// Note: Can be patched on document prototype on browsers with builtin accessors.\n// Must be patched separately on simulated ShadowRoot.\n// Must be patched as `_activeElement` on browsers without builtin accessors.\nexport let ActiveElementAccessor = {\n\n  activeElement: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return activeElementForNode(this);\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set() {},\n    configurable: true\n  }\n\n};\n\n// patch a group of descriptors on an object only if it exists or if the `force`\n// argument is true.\n/**\n * @param {!Object} obj\n * @param {!Object} descriptors\n * @param {boolean=} force\n */\nfunction patchAccessorGroup(obj, descriptors, force) {\n  for (let p in descriptors) {\n    let objDesc = Object.getOwnPropertyDescriptor(obj, p);\n    if ((objDesc && objDesc.configurable) ||\n      (!objDesc && force)) {\n      Object.defineProperty(obj, p, descriptors[p]);\n    } else if (force) {\n      console.warn('Could not define', p, 'on', obj);\n    }\n  }\n}\n\n// patch dom accessors on proto where they exist\nexport function patchAccessors(proto) {\n  patchAccessorGroup(proto, OutsideAccessors);\n  patchAccessorGroup(proto, InsideAccessors);\n  patchAccessorGroup(proto, ActiveElementAccessor);\n}\n\n// ensure element descriptors (IE/Edge don't have em)\nexport function patchShadowRootAccessors(proto) {\n  patchAccessorGroup(proto, InsideAccessors, true);\n  patchAccessorGroup(proto, ActiveElementAccessor, true);\n}\n\n// ensure an element has patched \"outside\" accessors; no-op when not needed\nexport let patchOutsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__outsideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__outsideAccessors = true;\n      patchAccessorGroup(element, OutsideAccessors, true);\n    }\n  }\n\n// ensure an element has patched \"inside\" accessors; no-op when not needed\nexport let patchInsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__insideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__insideAccessors = true;\n      patchAccessorGroup(element, InsideAccessors, true);\n      patchAccessorGroup(element, ShadowRootAccessor, true);\n    }\n  }\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-accessors.js';\nimport {firstChild, lastChild, childNodes} from './native-tree.js';\n\nexport function recordInsertBefore(node, container, ref_node) {\n  patchInsideElementAccessors(container);\n  container.__shady = container.__shady || {};\n  if (container.__shady.firstChild !== undefined) {\n    container.__shady.childNodes = null;\n  }\n  // handle document fragments\n  if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n    let c$ = node.childNodes;\n    for (let i=0; i < c$.length; i++) {\n      linkNode(c$[i], container, ref_node);\n    }\n    // cleanup logical dom in doc fragment.\n    node.__shady = node.__shady || {};\n    let resetTo = (node.__shady.firstChild !== undefined) ? null : undefined;\n    node.__shady.firstChild = node.__shady.lastChild = resetTo;\n    node.__shady.childNodes = resetTo;\n  } else {\n    linkNode(node, container, ref_node);\n  }\n}\n\nfunction linkNode(node, container, ref_node) {\n  patchOutsideElementAccessors(node);\n  ref_node = ref_node || null;\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (ref_node) {\n    ref_node.__shady = ref_node.__shady || {};\n  }\n  // update ref_node.previousSibling <-> node\n  node.__shady.previousSibling = ref_node ? ref_node.__shady.previousSibling :\n    container.lastChild;\n  let ps = node.__shady.previousSibling;\n  if (ps && ps.__shady) {\n    ps.__shady.nextSibling = node;\n  }\n  // update node <-> ref_node\n  let ns = node.__shady.nextSibling = ref_node;\n  if (ns && ns.__shady) {\n    ns.__shady.previousSibling = node;\n  }\n  // update node <-> container\n  node.__shady.parentNode = container;\n  if (ref_node) {\n    if (ref_node === container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  } else {\n    container.__shady.lastChild = node;\n    if (!container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  }\n  // remove caching of childNodes\n  container.__shady.childNodes = null;\n}\n\nexport function recordRemoveChild(node, container) {\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (node === container.__shady.firstChild) {\n    container.__shady.firstChild = node.__shady.nextSibling;\n  }\n  if (node === container.__shady.lastChild) {\n    container.__shady.lastChild = node.__shady.previousSibling;\n  }\n  let p = node.__shady.previousSibling;\n  let n = node.__shady.nextSibling;\n  if (p) {\n    p.__shady = p.__shady || {};\n    p.__shady.nextSibling = n;\n  }\n  if (n) {\n    n.__shady = n.__shady || {};\n    n.__shady.previousSibling = p;\n  }\n  // When an element is removed, logical data is no longer tracked.\n  // Explicitly set `undefined` here to indicate this. This is disginguished\n  // from `null` which is set if info is null.\n  node.__shady.parentNode = node.__shady.previousSibling =\n    node.__shady.nextSibling = undefined;\n  if (container.__shady.childNodes !== undefined) {\n    // remove caching of childNodes\n    container.__shady.childNodes = null;\n  }\n}\n\nexport let recordChildNodes = function(node) {\n  if (!node.__shady || node.__shady.firstChild === undefined) {\n    node.__shady = node.__shady || {};\n    node.__shady.firstChild = firstChild(node);\n    node.__shady.lastChild = lastChild(node);\n    patchInsideElementAccessors(node);\n    let c$ = node.__shady.childNodes = childNodes(node);\n    for (let i=0, n; (i<c$.length) && (n=c$[i]); i++) {\n      n.__shady = n.__shady || {};\n      n.__shady.parentNode = node;\n      n.__shady.nextSibling = c$[i+1] || null;\n      n.__shady.previousSibling = c$[i-1] || null;\n      patchOutsideElementAccessors(n);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as logicalTree from './logical-tree.js';\nimport * as nativeMethods from './native-methods.js';\nimport {parentNode} from './native-tree.js';\n\n// Patched `insertBefore`. Note that all mutations that add nodes are routed\n// here. When a <slot> is added or a node is added to a host with a shadowRoot\n// with a slot, a standard dom `insert` call is aborted and `_asyncRender`\n// is called on the relevant shadowRoot. In all other cases, a standard dom\n// `insert` can be made, but the location and ref_node may need to be changed.\n/**\n * @param {Node} parent\n * @param {Node} node\n * @param {Node=} ref_node\n */\nexport function insertBefore(parent, node, ref_node) {\n  if (node === parent) {\n    throw Error(`Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`);\n  }\n  if (ref_node) {\n    let p = ref_node.__shady && ref_node.__shady.parentNode;\n    if ((p !== undefined && p !== parent) ||\n      (p === undefined && parentNode(ref_node) !== parent)) {\n      throw Error(`Failed to execute 'insertBefore' on 'Node': The node ` +\n       `before which the new node is to be inserted is not a child of this node.`);\n    }\n  }\n  if (ref_node === node) {\n    return node;\n  }\n  // remove from existing location\n  if (node.parentNode) {\n    // NOTE: avoid node.removeChild as this *can* trigger another patched\n    // method (e.g. custom elements) and we want only the shady method to run.\n    removeChild(node.parentNode, node);\n  }\n  // add to new parent\n  let preventNativeInsert;\n  let ownerRoot = utils.ownerShadyRootForNode(parent);\n  // if a slot is added, must render containing root.\n  let slotsAdded = ownerRoot && findContainedSlots(node);\n  if (ownerRoot && (parent.localName === 'slot' || slotsAdded)) {\n    ownerRoot._asyncRender();\n  }\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordInsertBefore(node, parent, ref_node);\n    // when inserting into a host with a shadowRoot with slot, use\n    // `shadowRoot._asyncRender()` via `attach-shadow` module\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeInsert = true;\n    // when inserting into a host with shadowRoot with NO slot, do nothing\n    // as the node should not be added to composed dome anywhere.\n    } else if (parent.__shady.root) {\n      preventNativeInsert = true;\n    }\n  }\n  if (!preventNativeInsert) {\n    // if adding to a shadyRoot, add to host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host : parent;\n    // if ref_node, get the ref_node that's actually in composed dom.\n    if (ref_node) {\n      ref_node = firstComposedNode(ref_node);\n      nativeMethods.insertBefore.call(container, node, ref_node);\n    } else {\n      nativeMethods.appendChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, node);\n  // with insertion complete, can safely update insertion points.\n  if (slotsAdded) {\n    ownerRoot._addSlots(slotsAdded);\n  }\n  return node;\n}\n\nfunction findContainedSlots(node) {\n  if (!node['__noInsertionPoint']) {\n    let slots;\n    if (node.localName === 'slot') {\n      slots = [node];\n    } else if (node.querySelectorAll) {\n      slots = node.querySelectorAll('slot');\n    }\n    if (slots && slots.length) {\n      return slots;\n    }\n  }\n}\n\n/**\n * Patched `removeChild`. Note that all dom \"removals\" are routed here.\n * Removes the given `node` from the element's `children`.\n * This method also performs dom composition.\n * @param {Node} parent\n * @param {Node} node\n*/\nexport function removeChild(parent, node) {\n  if (node.parentNode !== parent) {\n    throw Error('The node to be removed is not a child of this node: ' +\n      node);\n  }\n  let preventNativeRemove;\n  let ownerRoot = utils.ownerShadyRootForNode(node);\n  let removingInsertionPoint;\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordRemoveChild(node, parent);\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeRemove = true;\n    }\n  }\n  removeOwnerShadyRoot(node);\n  // if removing slot, must render containing root\n  if (ownerRoot) {\n    let changeSlotContent = parent && parent.localName === 'slot';\n    if (changeSlotContent) {\n      preventNativeRemove = true;\n    }\n    removingInsertionPoint = ownerRoot._removeContainedSlots(node);\n    if (removingInsertionPoint || changeSlotContent) {\n      ownerRoot._asyncRender();\n    }\n  }\n  if (!preventNativeRemove) {\n    // if removing from a shadyRoot, remove form host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host :\n      parent;\n    // not guaranteed to physically be in container; e.g.\n    // (1) if parent has a shadyRoot, element may or may not at distributed\n    // location (could be undistributed)\n    // (2) if parent is a slot, element may not ben in composed dom\n    if (!(parent.__shady.root || node.localName === 'slot') ||\n      (container === parentNode(node))) {\n      nativeMethods.removeChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, null, node);\n  return node;\n}\n\nfunction removeOwnerShadyRoot(node) {\n  // optimization: only reset the tree if node is actually in a root\n  if (hasCachedOwnerRoot(node)) {\n    let c$ = node.childNodes;\n    for (let i=0, l=c$.length, n; (i<l) && (n=c$[i]); i++) {\n      removeOwnerShadyRoot(n);\n    }\n  }\n  if (node.__shady) {\n    node.__shady.ownerShadyRoot = undefined;\n  }\n}\n\nfunction hasCachedOwnerRoot(node) {\n  return Boolean(node.__shady && node.__shady.ownerShadyRoot !== undefined);\n}\n\n/**\n * Finds the first flattened node that is composed in the node's parent.\n * If the given node is a slot, then the first flattened node is returned\n * if it exists, otherwise advance to the node's nextSibling.\n * @param {Node} node within which to find first composed node\n * @returns {Node} first composed node\n */\nfunction firstComposedNode(node) {\n  let composed = node;\n  if (node && node.localName === 'slot') {\n    let flattened = node.__shady && node.__shady.flattenedNodes;\n    composed = flattened && flattened.length ? flattened[0] :\n      firstComposedNode(node.nextSibling);\n  }\n  return composed;\n}\n\nfunction hasShadowRootWithSlot(node) {\n  let root = node && node.__shady && node.__shady.root;\n  return (root && root._hasInsertionPoint());\n}\n\n/**\n * Should be called whenever an attribute changes. If the `slot` attribute\n * changes, provokes rendering if necessary. If a `<slot>` element's `name`\n * attribute changes, updates the root's slot map and renders.\n * @param {Node} node\n * @param {string} name\n */\nfunction distributeAttributeChange(node, name) {\n  if (name === 'slot') {\n    const parent = node.parentNode;\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n    }\n  } else if (node.localName === 'slot' && name === 'name') {\n    let root = utils.ownerShadyRootForNode(node);\n    if (root) {\n      root._updateSlotName(node);\n      root._asyncRender();\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Node=} addedNode\n * @param {Node=} removedNode\n */\nfunction scheduleObserver(node, addedNode, removedNode) {\n  let observer = node.__shady && node.__shady.observer;\n  if (observer) {\n    if (addedNode) {\n      observer.addedNodes.push(addedNode);\n    }\n    if (removedNode) {\n      observer.removedNodes.push(removedNode);\n    }\n    observer.schedule();\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Object=} options\n */\nexport function getRootNode(node, options) { // eslint-disable-line no-unused-vars\n  if (!node || !node.nodeType) {\n    return;\n  }\n  node.__shady = node.__shady || {};\n  let root = node.__shady.ownerShadyRoot;\n  if (root === undefined) {\n    if (utils.isShadyRoot(node)) {\n      root = node;\n    } else {\n      let parent = node.parentNode;\n      root = parent ? getRootNode(parent) : node;\n    }\n    // memo-ize result for performance but only memo-ize\n    // result if node is in the document. This avoids a problem where a root\n    // can be cached while an element is inside a fragment.\n    // If this happens and we cache the result, the value can become stale\n    // because for perf we avoid processing the subtree of added fragments.\n    if (document.documentElement.contains(node)) {\n      node.__shady.ownerShadyRoot = root;\n    }\n  }\n  return root;\n}\n\n// NOTE: `query` is used primarily for ShadyDOM's querySelector impl,\n// but it's also generally useful to recurse through the element tree\n// and is used by Polymer's styling system.\n/**\n * @param {Node} node\n * @param {Function} matcher\n * @param {Function=} halter\n */\nexport function query(node, matcher, halter) {\n  let list = [];\n  queryElements(node.childNodes, matcher,\n    halter, list);\n  return list;\n}\n\nfunction queryElements(elements, matcher, halter, list) {\n  for (let i=0, l=elements.length, c; (i<l) && (c=elements[i]); i++) {\n    if (c.nodeType === Node.ELEMENT_NODE &&\n        queryElement(c, matcher, halter, list)) {\n      return true;\n    }\n  }\n}\n\nfunction queryElement(node, matcher, halter, list) {\n  let result = matcher(node);\n  if (result) {\n    list.push(node);\n  }\n  if (halter && halter(result)) {\n    return result;\n  }\n  queryElements(node.childNodes, matcher,\n    halter, list);\n}\n\nexport function renderRootNode(element) {\n  var root = element.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    root._render();\n  }\n}\n\nlet scopingShim = null;\n\nexport function setAttribute(node, attr, value) {\n  if (!scopingShim) {\n    scopingShim = window['ShadyCSS'] && window['ShadyCSS']['ScopingShim'];\n  }\n  if (scopingShim && attr === 'class') {\n    scopingShim['setElementClass'](node, value);\n  } else {\n    nativeMethods.setAttribute.call(node, attr, value);\n    distributeAttributeChange(node, attr);\n  }\n}\n\nexport function removeAttribute(node, attr) {\n  nativeMethods.removeAttribute.call(node, attr);\n  distributeAttributeChange(node, attr);\n}\n\nexport function cloneNode(node, deep) {\n  if (node.localName == 'template') {\n    return nativeMethods.cloneNode.call(node, deep);\n  } else {\n    let n = nativeMethods.cloneNode.call(node, false);\n    if (deep) {\n      let c$ = node.childNodes;\n      for (let i=0, nc; i < c$.length; i++) {\n        nc = c$[i].cloneNode(true);\n        n.appendChild(nc);\n      }\n    }\n    return n;\n  }\n}\n\n// note: Though not technically correct, we fast path `importNode`\n// when called on a node not owned by the main document.\n// This allows, for example, elements that cannot\n// contain custom elements and are therefore not likely to contain shadowRoots\n// to cloned natively. This is a fairly significant performance win.\nexport function importNode(node, deep) {\n  if (node.ownerDocument !== document) {\n    return nativeMethods.importNode.call(document, node, deep);\n  }\n  let n = nativeMethods.importNode.call(document, node, false);\n  if (deep) {\n    let c$ = node.childNodes;\n    for (let i=0, nc; i < c$.length; i++) {\n      nc = importNode(c$[i], true);\n      n.appendChild(nc);\n    }\n  }\n  return n;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as nativeMethods from './native-methods.js';\n\n// https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937\nlet alwaysComposed = {\n  'blur': true,\n  'focus': true,\n  'focusin': true,\n  'focusout': true,\n  'click': true,\n  'dblclick': true,\n  'mousedown': true,\n  'mouseenter': true,\n  'mouseleave': true,\n  'mousemove': true,\n  'mouseout': true,\n  'mouseover': true,\n  'mouseup': true,\n  'wheel': true,\n  'beforeinput': true,\n  'input': true,\n  'keydown': true,\n  'keyup': true,\n  'compositionstart': true,\n  'compositionupdate': true,\n  'compositionend': true,\n  'touchstart': true,\n  'touchend': true,\n  'touchmove': true,\n  'touchcancel': true,\n  'pointerover': true,\n  'pointerenter': true,\n  'pointerdown': true,\n  'pointermove': true,\n  'pointerup': true,\n  'pointercancel': true,\n  'pointerout': true,\n  'pointerleave': true,\n  'gotpointercapture': true,\n  'lostpointercapture': true,\n  'dragstart': true,\n  'drag': true,\n  'dragenter': true,\n  'dragleave': true,\n  'dragover': true,\n  'drop': true,\n  'dragend': true,\n  'DOMActivate': true,\n  'DOMFocusIn': true,\n  'DOMFocusOut': true,\n  'keypress': true\n};\n\nfunction pathComposer(startNode, composed) {\n  let composedPath = [];\n  let current = startNode;\n  let startRoot = startNode === window ? window : startNode.getRootNode();\n  while (current) {\n    composedPath.push(current);\n    if (current.assignedSlot) {\n      current = current.assignedSlot;\n    } else if (current.nodeType === Node.DOCUMENT_FRAGMENT_NODE && current.host && (composed || current !== startRoot)) {\n      current = current.host;\n    } else {\n      current = current.parentNode;\n    }\n  }\n  // event composedPath includes window when startNode's ownerRoot is document\n  if (composedPath[composedPath.length - 1] === document) {\n    composedPath.push(window);\n  }\n  return composedPath;\n}\n\nfunction retarget(refNode, path) {\n  if (!utils.isShadyRoot) {\n    return refNode;\n  }\n  // If ANCESTOR's root is not a shadow root or ANCESTOR's root is BASE's\n  // shadow-including inclusive ancestor, return ANCESTOR.\n  let refNodePath = pathComposer(refNode, true);\n  let p$ = path;\n  for (let i=0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {\n    ancestor = p$[i];\n    root = ancestor === window ? window : ancestor.getRootNode();\n    if (root !== lastRoot) {\n      rootIdx = refNodePath.indexOf(root);\n      lastRoot = root;\n    }\n    if (!utils.isShadyRoot(root) || rootIdx > -1) {\n      return ancestor;\n    }\n  }\n}\n\nlet eventMixin = {\n\n  /**\n   * @this {Event}\n   */\n  get composed() {\n    // isTrusted may not exist in this browser, so just check if isTrusted is explicitly false\n    if (this.isTrusted !== false && this.__composed === undefined) {\n      this.__composed = alwaysComposed[this.type];\n    }\n    return this.__composed || false;\n  },\n\n  /**\n   * @this {Event}\n   */\n  composedPath() {\n    if (!this.__composedPath) {\n      this.__composedPath = pathComposer(this['__target'], this.composed);\n    }\n    return this.__composedPath;\n  },\n\n  /**\n   * @this {Event}\n   */\n  get target() {\n    return retarget(this.currentTarget, this.composedPath());\n  },\n\n  // http://w3c.github.io/webcomponents/spec/shadow/#event-relatedtarget-retargeting\n  /**\n   * @this {Event}\n   */\n  get relatedTarget() {\n    if (!this.__relatedTarget) {\n      return null;\n    }\n    if (!this.__relatedTargetComposedPath) {\n      this.__relatedTargetComposedPath = pathComposer(this.__relatedTarget, true);\n    }\n    // find the deepest node in relatedTarget composed path that is in the same root with the currentTarget\n    return retarget(this.currentTarget, this.__relatedTargetComposedPath);\n  },\n  /**\n   * @this {Event}\n   */\n  stopPropagation() {\n    Event.prototype.stopPropagation.call(this);\n    this.__propagationStopped = true;\n  },\n  /**\n   * @this {Event}\n   */\n  stopImmediatePropagation() {\n    Event.prototype.stopImmediatePropagation.call(this);\n    this.__immediatePropagationStopped = true;\n    this.__propagationStopped = true;\n  }\n\n};\n\nfunction mixinComposedFlag(Base) {\n  // NOTE: avoiding use of `class` here so that transpiled output does not\n  // try to do `Base.call` with a dom construtor.\n  let klazz = function(type, options) {\n    let event = new Base(type, options);\n    event.__composed = options && Boolean(options['composed']);\n    return event;\n  }\n  // put constructor properties on subclass\n  utils.mixin(klazz, Base);\n  klazz.prototype = Base.prototype;\n  return klazz;\n}\n\nlet nonBubblingEventsToRetarget = {\n  'focus': true,\n  'blur': true\n};\n\n\nfunction fireHandlers(event, node, phase) {\n  let hs = node.__handlers && node.__handlers[event.type] &&\n    node.__handlers[event.type][phase];\n  if (hs) {\n    for (let i = 0, fn; (fn = hs[i]); i++) {\n      if (event.target === event.relatedTarget) {\n        return;\n      }\n      fn.call(node, event);\n      if (event.__immediatePropagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction retargetNonBubblingEvent(e) {\n  let path = e.composedPath();\n  let node;\n  // override `currentTarget` to let patched `target` calculate correctly\n  Object.defineProperty(e, 'currentTarget', {\n    get: function() {\n      return node;\n    },\n    configurable: true\n  });\n  for (let i = path.length - 1; i >= 0; i--) {\n    node = path[i];\n    // capture phase fires all capture handlers\n    fireHandlers(e, node, 'capture');\n    if (e.__propagationStopped) {\n      return;\n    }\n  }\n\n  // set the event phase to `AT_TARGET` as in spec\n  Object.defineProperty(e, 'eventPhase', {get() { return Event.AT_TARGET }});\n\n  // the event only needs to be fired when owner roots change when iterating the event path\n  // keep track of the last seen owner root\n  let lastFiredRoot;\n  for (let i = 0; i < path.length; i++) {\n    node = path[i];\n    const root = node.__shady && node.__shady.root;\n    if (i === 0 || (root && root === lastFiredRoot)) {\n      fireHandlers(e, node, 'bubble');\n      // don't bother with window, it doesn't have `getRootNode` and will be last in the path anyway\n      if (node !== window) {\n        lastFiredRoot = node.getRootNode();\n      }\n      if (e.__propagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction listenerSettingsEqual(savedListener, node, type, capture, once, passive) {\n  let {\n    node: savedNode,\n    type: savedType,\n    capture: savedCapture,\n    once: savedOnce,\n    passive: savedPassive\n  } = savedListener;\n  return node === savedNode &&\n    type === savedType &&\n    capture === savedCapture &&\n    once === savedOnce &&\n    passive === savedPassive;\n}\n\nexport function findListener(wrappers, node, type, capture, once, passive) {\n  for (let i = 0; i < wrappers.length; i++) {\n    if (listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)) {\n      return i;\n    }\n  }\n  return -1;\n}\n\n/**\n * Firefox can throw on accessing __eventWrappers inside of `removeEventListener` during a selenium run\n * Try/Catch accessing __eventWrappers to work around\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1353074\n */\nfunction getEventWrappers(eventLike) {\n  let wrappers = null;\n  try {\n    wrappers = eventLike.__eventWrappers;\n  } catch (e) {} // eslint-disable-line no-empty\n  return wrappers;\n}\n\n/**\n * @this {Event}\n */\nexport function addEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // The callback `fn` might be used for multiple nodes/events. Since we generate\n  // a wrapper function, we need to keep track of it when we remove the listener.\n  // It's more efficient to store the node/type/options information as Array in\n  // `fn` itself rather than the node (we assume that the same callback is used\n  // for few nodes at most, whereas a node will likely have many event listeners).\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  // hack to let ShadyRoots have event listeners\n  // event listener will be on host, but `currentTarget`\n  // will be set to shadyroot for event listener\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n\n  let wrappers = fnOrObj.__eventWrappers;\n  if (wrappers) {\n    // Stop if the wrapper function has already been created.\n    if (findListener(wrappers, target, type, capture, once, passive) > -1) {\n      return;\n    }\n  } else {\n    fnOrObj.__eventWrappers = [];\n  }\n\n  /**\n   * @this {HTMLElement}\n   */\n  const wrapperFn = function(e) {\n    // Support `once` option.\n    if (once) {\n      this.removeEventListener(type, fnOrObj, optionsOrCapture);\n    }\n    if (!e['__target']) {\n      patchEvent(e);\n    }\n    let lastCurrentTargetDesc;\n    if (target !== this) {\n      // replace `currentTarget` to make `target` and `relatedTarget` correct for inside the shadowroot\n      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(e, 'currentTarget');\n      Object.defineProperty(e, 'currentTarget', {get() { return target }, configurable: true});\n    }\n    // There are two critera that should stop events from firing on this node\n    // 1. the event is not composed and the current node is not in the same root as the target\n    // 2. when bubbling, if after retargeting, relatedTarget and target point to the same node\n    if (e.composed || e.composedPath().indexOf(target) > -1) {\n      if (e.target === e.relatedTarget) {\n        if (e.eventPhase === Event.BUBBLING_PHASE) {\n          e.stopImmediatePropagation();\n        }\n        return;\n      }\n      // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase\n      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target) {\n        return;\n      }\n      let ret = (typeof fnOrObj === 'object' && fnOrObj.handleEvent) ?\n        fnOrObj.handleEvent(e) :\n        fnOrObj.call(target, e);\n      if (target !== this) {\n        // replace the \"correct\" `currentTarget`\n        if (lastCurrentTargetDesc) {\n          Object.defineProperty(e, 'currentTarget', lastCurrentTargetDesc);\n          lastCurrentTargetDesc = null;\n        } else {\n          delete e['currentTarget'];\n        }\n      }\n      return ret;\n    }\n  };\n  // Store the wrapper information.\n  fnOrObj.__eventWrappers.push({\n    node: this,\n    type: type,\n    capture: capture,\n    once: once,\n    passive: passive,\n    wrapperFn: wrapperFn\n  });\n\n  if (nonBubblingEventsToRetarget[type]) {\n    this.__handlers = this.__handlers || {};\n    this.__handlers[type] = this.__handlers[type] ||\n      {'capture': [], 'bubble': []};\n    this.__handlers[type][capture ? 'capture' : 'bubble'].push(wrapperFn);\n  } else {\n    let ael = this instanceof Window ? nativeMethods.windowAddEventListener :\n      nativeMethods.addEventListener;\n    ael.call(this, type, wrapperFn, optionsOrCapture);\n  }\n}\n\n/**\n * @this {Event}\n */\nexport function removeEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n  // Search the wrapped function.\n  let wrapperFn = undefined;\n  let wrappers = getEventWrappers(fnOrObj);\n  if (wrappers) {\n    let idx = findListener(wrappers, target, type, capture, once, passive);\n    if (idx > -1) {\n      wrapperFn = wrappers.splice(idx, 1)[0].wrapperFn;\n      // Cleanup.\n      if (!wrappers.length) {\n        fnOrObj.__eventWrappers = undefined;\n      }\n    }\n  }\n  let rel = this instanceof Window ? nativeMethods.windowRemoveEventListener :\n    nativeMethods.removeEventListener;\n  rel.call(this, type, wrapperFn || fnOrObj, optionsOrCapture);\n  if (wrapperFn && nonBubblingEventsToRetarget[type] &&\n      this.__handlers && this.__handlers[type]) {\n    const arr = this.__handlers[type][capture ? 'capture' : 'bubble'];\n    const idx = arr.indexOf(wrapperFn);\n    if (idx > -1) {\n      arr.splice(idx, 1);\n    }\n  }\n}\n\nfunction activateFocusEventOverrides() {\n  for (let ev in nonBubblingEventsToRetarget) {\n    window.addEventListener(ev, function(e) {\n      if (!e['__target']) {\n        patchEvent(e);\n        retargetNonBubblingEvent(e);\n      }\n    }, true);\n  }\n}\n\nfunction patchEvent(event) {\n  event['__target'] = event.target;\n  event.__relatedTarget = event.relatedTarget;\n  // patch event prototype if we can\n  if (utils.settings.hasDescriptors) {\n    utils.patchPrototype(event, eventMixin);\n  // and fallback to patching instance\n  } else {\n    utils.extend(event, eventMixin);\n  }\n}\n\nlet PatchedEvent = mixinComposedFlag(window.Event);\nlet PatchedCustomEvent = mixinComposedFlag(window.CustomEvent);\nlet PatchedMouseEvent = mixinComposedFlag(window.MouseEvent);\n\nexport function patchEvents() {\n  window.Event = PatchedEvent;\n  window.CustomEvent = PatchedCustomEvent;\n  window.MouseEvent = PatchedMouseEvent;\n  activateFocusEventOverrides();\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nfunction newSplice(index, removed, addedCount) {\n  return {\n    index: index,\n    removed: removed,\n    addedCount: addedCount\n  };\n}\n\nconst EDIT_LEAVE = 0;\nconst EDIT_UPDATE = 1;\nconst EDIT_ADD = 2;\nconst EDIT_DELETE = 3;\n\n// Note: This function is *based* on the computation of the Levenshtein\n// \"edit\" distance. The one change is that \"updates\" are treated as two\n// edits - not one. With Array splices, an update is really a delete\n// followed by an add. By retaining this, we optimize for \"keeping\" the\n// maximum array items in the original array. For example:\n//\n//   'xxxx123' -> '123yyyy'\n//\n// With 1-edit updates, the shortest path would be just to update all seven\n// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This\n// leaves the substring '123' intact.\nfunction calcEditDistances(current, currentStart, currentEnd,\n                            old, oldStart, oldEnd) {\n  // \"Deletion\" columns\n  let rowCount = oldEnd - oldStart + 1;\n  let columnCount = currentEnd - currentStart + 1;\n  let distances = new Array(rowCount);\n\n  // \"Addition\" rows. Initialize null column.\n  for (let i = 0; i < rowCount; i++) {\n    distances[i] = new Array(columnCount);\n    distances[i][0] = i;\n  }\n\n  // Initialize null row\n  for (let j = 0; j < columnCount; j++)\n    distances[0][j] = j;\n\n  for (let i = 1; i < rowCount; i++) {\n    for (let j = 1; j < columnCount; j++) {\n      if (equals(current[currentStart + j - 1], old[oldStart + i - 1]))\n        distances[i][j] = distances[i - 1][j - 1];\n      else {\n        let north = distances[i - 1][j] + 1;\n        let west = distances[i][j - 1] + 1;\n        distances[i][j] = north < west ? north : west;\n      }\n    }\n  }\n\n  return distances;\n}\n\n// This starts at the final weight, and walks \"backward\" by finding\n// the minimum previous weight recursively until the origin of the weight\n// matrix.\nfunction spliceOperationsFromEditDistances(distances) {\n  let i = distances.length - 1;\n  let j = distances[0].length - 1;\n  let current = distances[i][j];\n  let edits = [];\n  while (i > 0 || j > 0) {\n    if (i == 0) {\n      edits.push(EDIT_ADD);\n      j--;\n      continue;\n    }\n    if (j == 0) {\n      edits.push(EDIT_DELETE);\n      i--;\n      continue;\n    }\n    let northWest = distances[i - 1][j - 1];\n    let west = distances[i - 1][j];\n    let north = distances[i][j - 1];\n\n    let min;\n    if (west < north)\n      min = west < northWest ? west : northWest;\n    else\n      min = north < northWest ? north : northWest;\n\n    if (min == northWest) {\n      if (northWest == current) {\n        edits.push(EDIT_LEAVE);\n      } else {\n        edits.push(EDIT_UPDATE);\n        current = northWest;\n      }\n      i--;\n      j--;\n    } else if (min == west) {\n      edits.push(EDIT_DELETE);\n      i--;\n      current = west;\n    } else {\n      edits.push(EDIT_ADD);\n      j--;\n      current = north;\n    }\n  }\n\n  edits.reverse();\n  return edits;\n}\n\n/**\n * Splice Projection functions:\n *\n * A splice map is a representation of how a previous array of items\n * was transformed into a new array of items. Conceptually it is a list of\n * tuples of\n *\n *   <index, removed, addedCount>\n *\n * which are kept in ascending index order of. The tuple represents that at\n * the |index|, |removed| sequence of items were removed, and counting forward\n * from |index|, |addedCount| items were added.\n */\n\n/**\n * Lacking individual splice mutation information, the minimal set of\n * splices can be synthesized given the previous state and final state of an\n * array. The basic approach is to calculate the edit distance matrix and\n * choose the shortest path through it.\n *\n * Complexity: O(l * p)\n *   l: The length of the current array\n *   p: The length of the old array\n */\nfunction calcSplices(current, currentStart, currentEnd,\n                      old, oldStart, oldEnd) {\n  let prefixCount = 0;\n  let suffixCount = 0;\n  let splice;\n\n  let minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);\n  if (currentStart == 0 && oldStart == 0)\n    prefixCount = sharedPrefix(current, old, minLength);\n\n  if (currentEnd == current.length && oldEnd == old.length)\n    suffixCount = sharedSuffix(current, old, minLength - prefixCount);\n\n  currentStart += prefixCount;\n  oldStart += prefixCount;\n  currentEnd -= suffixCount;\n  oldEnd -= suffixCount;\n\n  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)\n    return [];\n\n  if (currentStart == currentEnd) {\n    splice = newSplice(currentStart, [], 0);\n    while (oldStart < oldEnd)\n      splice.removed.push(old[oldStart++]);\n\n    return [ splice ];\n  } else if (oldStart == oldEnd)\n    return [ newSplice(currentStart, [], currentEnd - currentStart) ];\n\n  let ops = spliceOperationsFromEditDistances(\n      calcEditDistances(current, currentStart, currentEnd,\n                             old, oldStart, oldEnd));\n\n  splice = undefined;\n  let splices = [];\n  let index = currentStart;\n  let oldIndex = oldStart;\n  for (let i = 0; i < ops.length; i++) {\n    switch(ops[i]) {\n      case EDIT_LEAVE:\n        if (splice) {\n          splices.push(splice);\n          splice = undefined;\n        }\n\n        index++;\n        oldIndex++;\n        break;\n      case EDIT_UPDATE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n      case EDIT_ADD:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n        break;\n      case EDIT_DELETE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n    }\n  }\n\n  if (splice) {\n    splices.push(splice);\n  }\n  return splices;\n}\n\nfunction sharedPrefix(current, old, searchLength) {\n  for (let i = 0; i < searchLength; i++)\n    if (!equals(current[i], old[i]))\n      return i;\n  return searchLength;\n}\n\nfunction sharedSuffix(current, old, searchLength) {\n  let index1 = current.length;\n  let index2 = old.length;\n  let count = 0;\n  while (count < searchLength && equals(current[--index1], old[--index2]))\n    count++;\n\n  return count;\n}\n\nfunction equals(currentValue, previousValue) {\n  return currentValue === previousValue;\n}\n\nexport function calculateSplices(current, previous) {\n  return calcSplices(current, 0, current.length, previous, 0,\n                          previous.length);\n}\n\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as mutation from './logical-mutation.js';\nimport {calculateSplices} from './array-splice.js';\nimport * as utils from './utils.js';\nimport {enqueue} from './flush.js';\nimport {recordChildNodes} from './logical-tree.js';\nimport {removeChild, insertBefore, dispatchEvent} from './native-methods.js';\nimport {parentNode, childNodes} from './native-tree.js';\nimport {patchShadowRootAccessors} from './patch-accessors.js';\n\n// Do not export this object. It must be passed as the first argument to the\n// ShadyRoot constructor in `attachShadow` to prevent the constructor from\n// throwing. This prevents the user from being able to manually construct a\n// ShadyRoot (i.e. `new ShadowRoot()`).\nconst ShadyRootConstructionToken = {};\n\nconst CATCHALL_NAME = '__catchall';\n\n/**\n * @constructor\n * @extends {ShadowRoot}\n */\nexport let ShadyRoot = function(token, host, options) {\n  if (token !== ShadyRootConstructionToken) {\n    throw new TypeError('Illegal constructor');\n  }\n  // NOTE: this strange construction is necessary because\n  // DocumentFragment cannot be subclassed on older browsers.\n  let shadowRoot = document.createDocumentFragment();\n  shadowRoot.__proto__ = ShadyRoot.prototype;\n  /** @type {ShadyRoot} */ (shadowRoot)._init(host, options);\n  return shadowRoot;\n};\n\nShadyRoot.prototype = Object.create(DocumentFragment.prototype);\n\nShadyRoot.prototype._init = function(host, options) {\n  // NOTE: set a fake local name so this element can be\n  // distinguished from a DocumentFragment when patching.\n  // FF doesn't allow this to be `localName`\n  this.__localName = 'ShadyRoot';\n  // logical dom setup\n  recordChildNodes(host);\n  recordChildNodes(this);\n  // root <=> host\n  this.host = host;\n  this._mode = options && options.mode;\n  host.__shady = host.__shady || {};\n  host.__shady.root = this;\n  host.__shady.publicRoot = this._mode !== 'closed' ? this : null;\n  // state flags\n  this._renderPending = false;\n  this._hasRendered = false;\n  this._slotList = [];\n  this._slotMap = null;\n  // fast path initial render: remove existing physical dom.\n  let c$ = childNodes(host);\n  for (let i=0, l=c$.length; i < l; i++) {\n    removeChild.call(host, c$[i])\n  }\n}\n\n// async render\nShadyRoot.prototype._asyncRender = function() {\n  if (!this._renderPending) {\n    this._renderPending = true;\n    enqueue(() => this._render());\n  }\n}\n\n// returns the oldest renderPending ancestor root.\nShadyRoot.prototype._getRenderRoot = function() {\n  let renderRoot = this;\n  let root = this;\n  while (root) {\n    if (root._renderPending) {\n      renderRoot = root;\n    }\n    root = root._rendererForHost();\n  }\n  return renderRoot;\n}\n\n// Returns the shadyRoot `this.host` if `this.host`\n// has children that require distribution.\nShadyRoot.prototype._rendererForHost = function() {\n  let root = this.host.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    let c$ = this.host.childNodes;\n    for (let i=0, c; i < c$.length; i++) {\n      c = c$[i];\n      if (this._isInsertionPoint(c)) {\n        return root;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._render = function() {\n  if (this._renderPending) {\n    this._getRenderRoot()['_renderRoot']();\n  }\n}\n\n// NOTE: avoid renaming to ease testability.\nShadyRoot.prototype['_renderRoot'] = function() {\n  this._renderPending = false;\n  this._distribute();\n  this._compose();\n  this._hasRendered = true;\n}\n\nShadyRoot.prototype._distribute = function() {\n  // capture # of previously assigned nodes to help determine if dirty.\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    this._clearSlotAssignedNodes(slot);\n  }\n  // distribute host children.\n  for (let n=this.host.firstChild; n; n=n.nextSibling) {\n    this._distributeNodeToSlot(n);\n  }\n  // fallback content, slotchange, and dirty roots\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    // distribute fallback content\n    if (!slot.__shady.assignedNodes.length) {\n      for (let n=slot.firstChild; n; n=n.nextSibling) {\n        this._distributeNodeToSlot(n, slot);\n      }\n    }\n    const slotParent = slot.parentNode;\n    const slotParentRoot = slotParent.__shady && slotParent.__shady.root;\n    if (slotParentRoot && slotParentRoot._hasInsertionPoint()) {\n      slotParentRoot['_renderRoot']();\n    }\n    this._addAssignedToFlattenedNodes(slot.__shady.flattenedNodes,\n      slot.__shady.assignedNodes);\n    let prevAssignedNodes = slot.__shady._previouslyAssignedNodes;\n    if (prevAssignedNodes) {\n      for (let i=0; i < prevAssignedNodes.length; i++) {\n        prevAssignedNodes[i].__shady._prevAssignedSlot = null;\n      }\n      slot.__shady._previouslyAssignedNodes = null;\n      // dirty if previously less assigned nodes than previously assigned.\n      if (prevAssignedNodes.length > slot.__shady.assignedNodes.length) {\n        slot.__shady.dirty = true;\n      }\n    }\n    /* Note: A slot is marked dirty whenever a node is newly assigned to it\n    or a node is assigned to a different slot (done in `_distributeNodeToSlot`)\n    or if the number of nodes assigned to the slot has decreased (done above);\n     */\n    if (slot.__shady.dirty) {\n      slot.__shady.dirty = false;\n      this._fireSlotChange(slot);\n    }\n  }\n}\n\n/**\n * Distributes given `node` to the appropriate slot based on its `slot`\n * attribute. If `forcedSlot` is given, then the node is distributed to the\n * `forcedSlot`.\n * Note: slot to which the node is assigned will be marked dirty for firing\n * `slotchange`.\n * @param {Node} node\n * @param {Node=} forcedSlot\n *\n */\nShadyRoot.prototype._distributeNodeToSlot = function(node, forcedSlot) {\n  node.__shady = node.__shady || {};\n  let oldSlot = node.__shady._prevAssignedSlot;\n  node.__shady._prevAssignedSlot = null;\n  let slot = forcedSlot;\n  if (!slot) {\n    let name = node.slot || CATCHALL_NAME;\n    const list = this._slotMap[name];\n    slot = list && list[0];\n  }\n  if (slot) {\n    slot.__shady.assignedNodes.push(node);\n    node.__shady.assignedSlot = slot;\n  } else {\n    node.__shady.assignedSlot = undefined;\n  }\n  if (oldSlot !== node.__shady.assignedSlot) {\n    if (node.__shady.assignedSlot) {\n      node.__shady.assignedSlot.__shady.dirty = true;\n    }\n  }\n}\n\n/**\n * Clears the assignedNodes tracking data for a given `slot`. Note, the current\n * assigned node data is tracked (via _previouslyAssignedNodes and\n * _prevAssignedSlot) to see if `slotchange` should fire. This data may be out\n *  of date at this time because the assigned nodes may have already been\n * distributed to another root. This is ok since this data is only used to\n * track changes.\n * @param {HTMLSlotElement} slot\n */\nShadyRoot.prototype._clearSlotAssignedNodes = function(slot) {\n  let n$ = slot.__shady.assignedNodes;\n  slot.__shady.assignedNodes = [];\n  slot.__shady.flattenedNodes = [];\n  slot.__shady._previouslyAssignedNodes = n$;\n  if (n$) {\n    for (let i=0; i < n$.length; i++) {\n      let n = n$[i];\n      n.__shady._prevAssignedSlot = n.__shady.assignedSlot;\n      // only clear if it was previously set to this slot;\n      // this helps ensure that if the node has otherwise been distributed\n      // ignore it.\n      if (n.__shady.assignedSlot === slot) {\n        n.__shady.assignedSlot = null;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._addAssignedToFlattenedNodes = function(flattened, asssigned) {\n  for (let i=0, n; (i<asssigned.length) && (n=asssigned[i]); i++) {\n    if (n.localName == 'slot') {\n      this._addAssignedToFlattenedNodes(flattened, n.__shady.assignedNodes);\n    } else {\n      flattened.push(asssigned[i]);\n    }\n  }\n}\n\nShadyRoot.prototype._fireSlotChange = function(slot) {\n  // NOTE: cannot bubble correctly here so not setting bubbles: true\n  // Safari tech preview does not bubble but chrome does\n  // Spec says it bubbles (https://dom.spec.whatwg.org/#mutation-observers)\n  dispatchEvent.call(slot, new Event('slotchange'));\n  if (slot.__shady.assignedSlot) {\n    this._fireSlotChange(slot.__shady.assignedSlot);\n  }\n}\n\n// Reify dom such that it is at its correct rendering position\n// based on logical distribution.\n// NOTE: here we only compose parents of <slot> elements and not the\n// shadowRoot into the host. The latter is performend via a fast path\n// in the `logical-mutation`.insertBefore.\nShadyRoot.prototype._compose = function() {\n  const slots = this._slotList;\n  let composeList = [];\n  for (let i=0; i < slots.length; i++) {\n    const parent = slots[i].parentNode;\n    /* compose node only if:\n      (1) parent does not have a shadowRoot since shadowRoot has already\n      composed into the host\n      (2) we're not already composing it\n      [consider (n^2) but rare better than Set]\n    */\n    if (!(parent.__shady && parent.__shady.root) &&\n      composeList.indexOf(parent) < 0) {\n      composeList.push(parent);\n    }\n  }\n  for (let i=0; i < composeList.length; i++) {\n    const node = composeList[i];\n    const targetNode = node === this ? this.host : node;\n    this._updateChildNodes(targetNode, this._composeNode(node));\n  }\n}\n\n// Returns the list of nodes which should be rendered inside `node`.\nShadyRoot.prototype._composeNode = function(node) {\n  let children = [];\n  let c$ = node.childNodes;\n  for (let i = 0; i < c$.length; i++) {\n    let child = c$[i];\n    // Note: if we see a slot here, the nodes are guaranteed to need to be\n    // composed here. This is because if there is redistribution, it has\n    // already been handled by this point.\n    if (this._isInsertionPoint(child)) {\n      let flattenedNodes = child.__shady.flattenedNodes;\n      for (let j = 0; j < flattenedNodes.length; j++) {\n        let distributedNode = flattenedNodes[j];\n          children.push(distributedNode);\n      }\n    } else {\n      children.push(child);\n    }\n  }\n  return children;\n}\n\nShadyRoot.prototype._isInsertionPoint = function(node) {\n    return node.localName == 'slot';\n  }\n\n// Ensures that the rendered node list inside `container` is `children`.\nShadyRoot.prototype._updateChildNodes = function(container, children) {\n  let composed = childNodes(container);\n  let splices = calculateSplices(children, composed);\n  // process removals\n  for (let i=0, d=0, s; (i<splices.length) && (s=splices[i]); i++) {\n    for (let j=0, n; (j < s.removed.length) && (n=s.removed[j]); j++) {\n      // check if the node is still where we expect it is before trying\n      // to remove it; this can happen if we move a node and\n      // then schedule its previous host for distribution resulting in\n      // the node being removed here.\n      if (parentNode(n) === container) {\n        removeChild.call(container, n);\n      }\n      composed.splice(s.index + d, 1);\n    }\n    d -= s.addedCount;\n  }\n  // process adds\n  for (let i=0, s, next; (i<splices.length) && (s=splices[i]); i++) { //eslint-disable-line no-redeclare\n    next = composed[s.index];\n    for (let j=s.index, n; j < s.index + s.addedCount; j++) {\n      n = children[j];\n      insertBefore.call(container, n, next);\n      composed.splice(j, 0, n);\n    }\n  }\n}\n\n/**\n * Adds the given slots. Slots are maintained in an dom-ordered list.\n * In addition a map of name to slot is updated.\n */\nShadyRoot.prototype._addSlots = function(slots) {\n  let slotNamesToSort;\n  this._slotMap = this._slotMap || {};\n  this._slotList = this._slotList || [];\n  for (let i=0; i < slots.length; i++) {\n    let slot = slots[i];\n    // ensure insertionPoints's and their parents have logical dom info.\n    // save logical tree info\n    // a. for shadyRoot\n    // b. for insertion points (fallback)\n    // c. for parents of insertion points\n    slot.__shady = slot.__shady || {};\n    recordChildNodes(slot);\n    recordChildNodes(slot.parentNode);\n    let name = this._nameForSlot(slot);\n    if (this._slotMap[name]) {\n      slotNamesToSort = slotNamesToSort || {};\n      slotNamesToSort[name] = true;\n      this._slotMap[name].push(slot);\n    } else {\n      this._slotMap[name] = [slot];\n    }\n    this._slotList.push(slot);\n  }\n  if (slotNamesToSort) {\n    for (let n in slotNamesToSort) {\n      this._slotMap[n] = this._sortSlots(this._slotMap[n]);\n    }\n  }\n}\n\nShadyRoot.prototype._nameForSlot = function(slot) {\n  const name = slot['name'] || slot.getAttribute('name') || CATCHALL_NAME;\n  slot.__slotName = name;\n  return name;\n}\n\n/**\n * Slots are kept in an ordered list. Slots with the same name\n * are sorted here by tree order.\n */\nShadyRoot.prototype._sortSlots = function(slots) {\n  // NOTE: Cannot use `compareDocumentPosition` because it's not polyfilled,\n  // but the code here could be used to polyfill the preceeding/following info\n  // in `compareDocumentPosition`.\n  return slots.sort((a, b) => {\n    let listA = ancestorList(a);\n    let listB = ancestorList(b);\n    for (var i=0; i < listA.length; i++) {\n      let nA = listA[i];\n      let nB = listB[i];\n      if (nA !== nB) {\n        let c$ = Array.from(nA.parentNode.childNodes);\n        return c$.indexOf(nA) - c$.indexOf(nB);\n      }\n    }\n  });\n}\n\nfunction ancestorList(node) {\n  let ancestors = [];\n  do {\n    ancestors.unshift(node);\n  } while ((node = node.parentNode));\n  return ancestors;\n}\n\n// NOTE: could be used to help polyfill `document.contains`.\nfunction contains(container, node) {\n  while (node) {\n    if (node == container) {\n      return true;\n    }\n    node = node.parentNode;\n  }\n}\n\n/**\n * Removes from tracked slot data any slots contained within `container` and\n * then updates the tracked data (_slotList and _slotMap).\n * Any removed slots also have their `assignedNodes` removed from comopsed dom.\n */\nShadyRoot.prototype._removeContainedSlots = function(container) {\n  let didRemove;\n  this._slotMap = this._slotMap || {};\n  this._slotList = this._slotList || [];\n  const map = this._slotMap;\n  for (let n in map) {\n    let slots = map[n];\n    for (let i=0; i < slots.length; i++) {\n      let slot = slots[i];\n      if (contains(container, slot)) {\n        slots.splice(i, 1);\n        const x = this._slotList.indexOf(slot);\n        if (x >= 0) {\n          this._slotList.splice(x, 1);\n        }\n        i--;\n        this._removeFlattenedNodes(slot);\n        didRemove = true;\n      }\n    }\n  }\n  return didRemove;\n}\n\nShadyRoot.prototype._updateSlotName = function(slot) {\n  const oldName = slot.__slotName;\n  const name = this._nameForSlot(slot);\n  if (name === oldName) {\n    return;\n  }\n  // remove from existing tracking\n  let slots = this._slotMap[oldName];\n  const i = slots.indexOf(slot);\n  if (i >= 0) {\n    slots.splice(i, 1);\n  }\n  // add to new location and sort if nedessary\n  let list = this._slotMap[name] || (this._slotMap[name] = []);\n  list.push(slot);\n  if (list.length > 1) {\n    this._slotMap[name] = this._sortSlots(list);\n  }\n}\n\nShadyRoot.prototype._removeFlattenedNodes = function(slot) {\n  let n$ = slot.__shady.flattenedNodes;\n  if (n$) {\n    for (let i=0; i<n$.length; i++) {\n      let node = n$[i];\n      let parent = parentNode(node);\n      if (parent) {\n        removeChild.call(parent, node);\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._hasInsertionPoint = function() {\n  return Boolean(this._slotList.length);\n}\n\nShadyRoot.prototype.addEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.addEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.removeEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.removeEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.getElementById = function(id) {\n  let result = mutation.query(this, function(n) {\n    return n.id == id;\n  }, function(n) {\n    return Boolean(n);\n  })[0];\n  return result || null;\n}\n\n/**\n  Implements a pared down version of ShadowDOM's scoping, which is easy to\n  polyfill across browsers.\n*/\nexport function attachShadow(host, options) {\n  if (!host) {\n    throw 'Must provide a host.';\n  }\n  if (!options) {\n    throw 'Not enough arguments.'\n  }\n  return new ShadyRoot(ShadyRootConstructionToken, host, options);\n}\n\npatchShadowRootAccessors(ShadyRoot.prototype);","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {flush} from './flush.js';\nimport {dispatchEvent} from './native-methods.js';\nimport * as mutation from './logical-mutation.js';\nimport {ActiveElementAccessor, ShadowRootAccessor, patchAccessors} from './patch-accessors.js';\nimport {addEventListener, removeEventListener} from './patch-events.js';\nimport {attachShadow, ShadyRoot} from './attach-shadow.js';\n\nfunction getAssignedSlot(node) {\n  mutation.renderRootNode(node);\n  return node.__shady && node.__shady.assignedSlot || null;\n}\n\nlet windowMixin = {\n\n  // NOTE: ensure these methods are bound to `window` so that `this` is correct\n  // when called directly from global context without a receiver; e.g.\n  // `addEventListener(...)`.\n  addEventListener: addEventListener.bind(window),\n\n  removeEventListener: removeEventListener.bind(window)\n\n};\n\nlet nodeMixin = {\n\n  addEventListener: addEventListener,\n\n  removeEventListener: removeEventListener,\n\n  appendChild(node) {\n    return mutation.insertBefore(this, node);\n  },\n\n  insertBefore(node, ref_node) {\n    return mutation.insertBefore(this, node, ref_node);\n  },\n\n  removeChild(node) {\n    return mutation.removeChild(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  replaceChild(node, ref_node) {\n    mutation.insertBefore(this, node, ref_node);\n    mutation.removeChild(this, ref_node);\n    return node;\n  },\n\n  /**\n   * @this {Node}\n   */\n  cloneNode(deep) {\n    return mutation.cloneNode(this, deep);\n  },\n\n  /**\n   * @this {Node}\n   */\n  getRootNode(options) {\n    return mutation.getRootNode(this, options);\n  },\n\n  /**\n   * @this {Node}\n   */\n  get isConnected() {\n    // Fast path for distributed nodes.\n    const ownerDocument = this.ownerDocument;\n    if (ownerDocument && ownerDocument.contains && ownerDocument.contains(this)) return true;\n    const ownerDocumentElement = ownerDocument.documentElement;\n    if (ownerDocumentElement && ownerDocumentElement.contains && ownerDocumentElement.contains(this)) return true;\n\n    let node = this;\n    while (node && !(node instanceof Document)) {\n      node = node.parentNode || (node instanceof ShadyRoot ? /** @type {ShadowRoot} */(node).host : undefined);\n    }\n    return !!(node && node instanceof Document);\n  },\n\n  /**\n   * @this {Node}\n   */\n  dispatchEvent(event) {\n    flush();\n    return dispatchEvent.call(this, event);\n  }\n\n};\n\n// NOTE: For some reason 'Text' redefines 'assignedSlot'\nlet textMixin = {\n  /**\n   * @this {Text}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n};\n\nlet fragmentMixin = {\n\n  // TODO(sorvell): consider doing native QSA and filtering results.\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelector(selector) {\n    // match selector and halt on first result.\n    let result = mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  },\n\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelectorAll(selector) {\n    return mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    });\n  }\n\n};\n\nlet slotMixin = {\n\n  /**\n   * @this {HTMLSlotElement}\n   */\n  assignedNodes(options) {\n    if (this.localName === 'slot') {\n      mutation.renderRootNode(this);\n      return this.__shady ?\n        ((options && options.flatten ? this.__shady.flattenedNodes :\n        this.__shady.assignedNodes) || []) :\n        [];\n    }\n  }\n\n};\n\nlet elementMixin = utils.extendAll({\n\n  /**\n   * @this {HTMLElement}\n   */\n  setAttribute(name, value) {\n    mutation.setAttribute(this, name, value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  removeAttribute(name) {\n    mutation.removeAttribute(this, name);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  attachShadow(options) {\n    return attachShadow(this, options);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get slot() {\n    return this.getAttribute('slot');\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  set slot(value) {\n    mutation.setAttribute(this, 'slot', value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n\n}, fragmentMixin, slotMixin);\n\nObject.defineProperties(elementMixin, ShadowRootAccessor);\n\nlet documentMixin = utils.extendAll({\n  /**\n   * @this {Document}\n   */\n  importNode(node, deep) {\n    return mutation.importNode(node, deep);\n  },\n\n  /**\n   * @this {Document}\n   */\n  getElementById(id) {\n    let result = mutation.query(this, function(n) {\n      return n.id == id;\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  }\n\n}, fragmentMixin);\n\nObject.defineProperties(documentMixin, {\n  '_activeElement': ActiveElementAccessor.activeElement\n});\n\nlet nativeBlur = HTMLElement.prototype.blur;\n\nlet htmlElementMixin = utils.extendAll({\n  /**\n   * @this {HTMLElement}\n   */\n  blur() {\n    let root = this.__shady && this.__shady.root;\n    let shadowActive = root && root.activeElement;\n    if (shadowActive) {\n      shadowActive.blur();\n    } else {\n      nativeBlur.call(this);\n    }\n  }\n})\n\nfunction patchBuiltin(proto, obj) {\n  let n$ = Object.getOwnPropertyNames(obj);\n  for (let i=0; i < n$.length; i++) {\n    let n = n$[i];\n    let d = Object.getOwnPropertyDescriptor(obj, n);\n    // NOTE: we prefer writing directly here because some browsers\n    // have descriptors that are writable but not configurable (e.g.\n    // `appendChild` on older browsers)\n    if (d.value) {\n      proto[n] = d.value;\n    } else {\n      Object.defineProperty(proto, n, d);\n    }\n  }\n}\n\n\n// Apply patches to builtins (e.g. Element.prototype). Some of these patches\n// can be done unconditionally (mostly methods like\n// `Element.prototype.appendChild`) and some can only be done when the browser\n// has proper descriptors on the builtin prototype\n// (e.g. `Element.prototype.firstChild`)`. When descriptors are not available,\n// elements are individually patched when needed (see e.g.\n// `patchInside/OutsideElementAccessors` in `patch-accessors.js`).\nexport function patchBuiltins() {\n  let nativeHTMLElement =\n    (window['customElements'] && window['customElements']['nativeHTMLElement']) ||\n    HTMLElement;\n  // These patches can always be done, for all supported browsers.\n  patchBuiltin(window.Node.prototype, nodeMixin);\n  patchBuiltin(window.Window.prototype, windowMixin);\n  patchBuiltin(window.Text.prototype, textMixin);\n  patchBuiltin(window.DocumentFragment.prototype, fragmentMixin);\n  patchBuiltin(window.Element.prototype, elementMixin);\n  patchBuiltin(window.Document.prototype, documentMixin);\n  if (window.HTMLSlotElement) {\n    patchBuiltin(window.HTMLSlotElement.prototype, slotMixin);\n  }\n  patchBuiltin(nativeHTMLElement.prototype, htmlElementMixin);\n  // These patches can *only* be done\n  // on browsers that have proper property descriptors on builtin prototypes.\n  // This includes: IE11, Edge, Chrome >= 4?; Safari >= 10, Firefox\n  // On older browsers (Chrome <= 4?, Safari 9), a per element patching\n  // strategy is used for patching accessors.\n  if (utils.settings.hasDescriptors) {\n    patchAccessors(window.Node.prototype);\n    patchAccessors(window.Text.prototype);\n    patchAccessors(window.DocumentFragment.prototype);\n    patchAccessors(window.Element.prototype);\n    patchAccessors(nativeHTMLElement.prototype);\n    patchAccessors(window.Document.prototype);\n    if (window.HTMLSlotElement) {\n      patchAccessors(window.HTMLSlotElement.prototype);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/**\n * Patches elements that interacts with ShadyDOM\n * such that tree traversal and mutation apis act like they would under\n * ShadowDOM.\n *\n * This import enables seemless interaction with ShadyDOM powered\n * custom elements, enabling better interoperation with 3rd party code,\n * libraries, and frameworks that use DOM tree manipulation apis.\n */\n\nimport * as utils from './utils.js';\nimport {flush, enqueue} from './flush.js';\nimport {observeChildren, unobserveChildren, filterMutations} from './observe-changes.js';\nimport * as nativeMethods from './native-methods.js';\nimport * as nativeTree from './native-tree.js';\nimport {patchBuiltins} from './patch-builtins.js';\nimport {patchEvents} from './patch-events.js';\nimport {ShadyRoot} from './attach-shadow.js';\n\nif (utils.settings.inUse) {\n  let ShadyDOM = {\n    // TODO(sorvell): remove when Polymer does not depend on this.\n    'inUse': utils.settings.inUse,\n    // TODO(sorvell): remove when Polymer does not depend on this\n    'patch': (node) => node,\n    'isShadyRoot': utils.isShadyRoot,\n    'enqueue': enqueue,\n    'flush': flush,\n    'settings': utils.settings,\n    'filterMutations': filterMutations,\n    'observeChildren': observeChildren,\n    'unobserveChildren': unobserveChildren,\n    'nativeMethods': nativeMethods,\n    'nativeTree': nativeTree\n  };\n\n  window['ShadyDOM'] = ShadyDOM;\n\n  // Apply patches to events...\n  patchEvents();\n  // Apply patches to builtins (e.g. Element.prototype) where applicable.\n  patchBuiltins();\n\n  window.ShadowRoot = ShadyRoot;\n}\n","const reservedTagList = new Set([\n  'annotation-xml',\n  'color-profile',\n  'font-face',\n  'font-face-src',\n  'font-face-uri',\n  'font-face-format',\n  'font-face-name',\n  'missing-glyph',\n]);\n\n/**\n * @param {string} localName\n * @returns {boolean}\n */\nexport function isValidCustomElementName(localName) {\n  const reserved = reservedTagList.has(localName);\n  const validForm = /^[a-z][.0-9_a-z]*-[\\-.0-9_a-z]*$/.test(localName);\n  return !reserved && validForm;\n}\n\n/**\n * @private\n * @param {!Node} node\n * @return {boolean}\n */\nexport function isConnected(node) {\n  // Use `Node#isConnected`, if defined.\n  const nativeValue = node.isConnected;\n  if (nativeValue !== undefined) {\n    return nativeValue;\n  }\n\n  /** @type {?Node|undefined} */\n  let current = node;\n  while (current && !(current.__CE_isImportDocument || current instanceof Document)) {\n    current = current.parentNode || (window.ShadowRoot && current instanceof ShadowRoot ? current.host : undefined);\n  }\n  return !!(current && (current.__CE_isImportDocument || current instanceof Document));\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextSiblingOrAncestorSibling(root, start) {\n  let node = start;\n  while (node && node !== root && !node.nextSibling) {\n    node = node.parentNode;\n  }\n  return (!node || node === root) ? null : node.nextSibling;\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextNode(root, start) {\n  return start.firstChild ? start.firstChild : nextSiblingOrAncestorSibling(root, start);\n}\n\n/**\n * @param {!Node} root\n * @param {!function(!Element)} callback\n * @param {!Set<Node>=} visitedImports\n */\nexport function walkDeepDescendantElements(root, callback, visitedImports = new Set()) {\n  let node = root;\n  while (node) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      const element = /** @type {!Element} */(node);\n\n      callback(element);\n\n      const localName = element.localName;\n      if (localName === 'link' && element.getAttribute('rel') === 'import') {\n        // If this import (polyfilled or not) has it's root node available,\n        // walk it.\n        const importNode = /** @type {!Node} */ (element.import);\n        if (importNode instanceof Node && !visitedImports.has(importNode)) {\n          // Prevent multiple walks of the same import root.\n          visitedImports.add(importNode);\n\n          for (let child = importNode.firstChild; child; child = child.nextSibling) {\n            walkDeepDescendantElements(child, callback, visitedImports);\n          }\n        }\n\n        // Ignore descendants of import links to prevent attempting to walk the\n        // elements created by the HTML Imports polyfill that we just walked\n        // above.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      } else if (localName === 'template') {\n        // Ignore descendants of templates. There shouldn't be any descendants\n        // because they will be moved into `.content` during construction in\n        // browsers that support template but, in case they exist and are still\n        // waiting to be moved by a polyfill, they will be ignored.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      }\n\n      // Walk shadow roots.\n      const shadowRoot = element.__CE_shadowRoot;\n      if (shadowRoot) {\n        for (let child = shadowRoot.firstChild; child; child = child.nextSibling) {\n          walkDeepDescendantElements(child, callback, visitedImports);\n        }\n      }\n    }\n\n    node = nextNode(root, node);\n  }\n}\n\n/**\n * Used to suppress Closure's \"Modifying the prototype is only allowed if the\n * constructor is in the same scope\" warning without using\n * `@suppress {newCheckTypes, duplicate}` because `newCheckTypes` is too broad.\n *\n * @param {!Object} destination\n * @param {string} name\n * @param {*} value\n */\nexport function setPropertyUnchecked(destination, name, value) {\n  destination[name] = value;\n}\n","/**\n * @enum {number}\n */\nconst CustomElementState = {\n  custom: 1,\n  failed: 2,\n};\n\nexport default CustomElementState;\n","import * as Utilities from './Utilities.js';\nimport CEState from './CustomElementState.js';\n\nexport default class CustomElementInternals {\n  constructor() {\n    /** @type {!Map<string, !CustomElementDefinition>} */\n    this._localNameToDefinition = new Map();\n\n    /** @type {!Map<!Function, !CustomElementDefinition>} */\n    this._constructorToDefinition = new Map();\n\n    /** @type {!Array<!function(!Node)>} */\n    this._patches = [];\n\n    /** @type {boolean} */\n    this._hasPatches = false;\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!CustomElementDefinition} definition\n   */\n  setDefinition(localName, definition) {\n    this._localNameToDefinition.set(localName, definition);\n    this._constructorToDefinition.set(definition.constructor, definition);\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!CustomElementDefinition|undefined}\n   */\n  localNameToDefinition(localName) {\n    return this._localNameToDefinition.get(localName);\n  }\n\n  /**\n   * @param {!Function} constructor\n   * @return {!CustomElementDefinition|undefined}\n   */\n  constructorToDefinition(constructor) {\n    return this._constructorToDefinition.get(constructor);\n  }\n\n  /**\n   * @param {!function(!Node)} listener\n   */\n  addPatch(listener) {\n    this._hasPatches = true;\n    this._patches.push(listener);\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patchTree(node) {\n    if (!this._hasPatches) return;\n\n    Utilities.walkDeepDescendantElements(node, element => this.patch(element));\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patch(node) {\n    if (!this._hasPatches) return;\n\n    if (node.__CE_patched) return;\n    node.__CE_patched = true;\n\n    for (let i = 0; i < this._patches.length; i++) {\n      this._patches[i](node);\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  connectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.connectedCallback(element);\n      } else {\n        this.upgradeElement(element);\n      }\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  disconnectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.disconnectedCallback(element);\n      }\n    }\n  }\n\n  /**\n   * Upgrades all uncustomized custom elements at and below a root node for\n   * which there is a definition. When custom element reaction callbacks are\n   * assumed to be called synchronously (which, by the current DOM / HTML spec\n   * definitions, they are *not*), callbacks for both elements customized\n   * synchronously by the parser and elements being upgraded occur in the same\n   * relative order.\n   *\n   * NOTE: This function, when used to simulate the construction of a tree that\n   * is already created but not customized (i.e. by the parser), does *not*\n   * prevent the element from reading the 'final' (true) state of the tree. For\n   * example, the element, during truly synchronous parsing / construction would\n   * see that it contains no children as they have not yet been inserted.\n   * However, this function does not modify the tree, the element will\n   * (incorrectly) have children. Additionally, self-modification restrictions\n   * for custom element constructors imposed by the DOM spec are *not* enforced.\n   *\n   *\n   * The following nested list shows the steps extending down from the HTML\n   * spec's parsing section that cause elements to be synchronously created and\n   * upgraded:\n   *\n   * The \"in body\" insertion mode:\n   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody\n   * - Switch on token:\n   *   .. other cases ..\n   *   -> Any other start tag\n   *      - [Insert an HTML element](below) for the token.\n   *\n   * Insert an HTML element:\n   * https://html.spec.whatwg.org/multipage/syntax.html#insert-an-html-element\n   * - Insert a foreign element for the token in the HTML namespace:\n   *   https://html.spec.whatwg.org/multipage/syntax.html#insert-a-foreign-element\n   *   - Create an element for a token:\n   *     https://html.spec.whatwg.org/multipage/syntax.html#create-an-element-for-the-token\n   *     - Will execute script flag is true?\n   *       - (Element queue pushed to the custom element reactions stack.)\n   *     - Create an element:\n   *       https://dom.spec.whatwg.org/#concept-create-element\n   *       - Sync CE flag is true?\n   *         - Constructor called.\n   *         - Self-modification restrictions enforced.\n   *       - Sync CE flag is false?\n   *         - (Upgrade reaction enqueued.)\n   *     - Attributes appended to element.\n   *       (`attributeChangedCallback` reactions enqueued.)\n   *     - Will execute script flag is true?\n   *       - (Element queue popped from the custom element reactions stack.\n   *         Reactions in the popped stack are invoked.)\n   *   - (Element queue pushed to the custom element reactions stack.)\n   *   - Insert the element:\n   *     https://dom.spec.whatwg.org/#concept-node-insert\n   *     - Shadow-including descendants are connected. During parsing\n   *       construction, there are no shadow-*excluding* descendants.\n   *       However, the constructor may have validly attached a shadow\n   *       tree to itself and added descendants to that shadow tree.\n   *       (`connectedCallback` reactions enqueued.)\n   *   - (Element queue popped from the custom element reactions stack.\n   *     Reactions in the popped stack are invoked.)\n   *\n   * @param {!Node} root\n   * @param {{\n   *   visitedImports: (!Set<!Node>|undefined),\n   *   upgrade: (!function(!Element)|undefined),\n   * }=} options\n   */\n  patchAndUpgradeTree(root, options = {}) {\n    const visitedImports = options.visitedImports || new Set();\n    const upgrade = options.upgrade || (element => this.upgradeElement(element));\n\n    const elements = [];\n\n    const gatherElements = element => {\n      if (element.localName === 'link' && element.getAttribute('rel') === 'import') {\n        // The HTML Imports polyfill sets a descendant element of the link to\n        // the `import` property, specifically this is *not* a Document.\n        const importNode = /** @type {?Node} */ (element.import);\n\n        if (importNode instanceof Node && importNode.readyState === 'complete') {\n          importNode.__CE_isImportDocument = true;\n\n          // Connected links are associated with the registry.\n          importNode.__CE_hasRegistry = true;\n        } else {\n          // If this link's import root is not available, its contents can't be\n          // walked. Wait for 'load' and walk it when it's ready.\n          element.addEventListener('load', () => {\n            const importNode = /** @type {!Node} */ (element.import);\n\n            if (importNode.__CE_documentLoadHandled) return;\n            importNode.__CE_documentLoadHandled = true;\n\n            importNode.__CE_isImportDocument = true;\n\n            // Connected links are associated with the registry.\n            importNode.__CE_hasRegistry = true;\n\n            // Clone the `visitedImports` set that was populated sync during\n            // the `patchAndUpgradeTree` call that caused this 'load' handler to\n            // be added. Then, remove *this* link's import node so that we can\n            // walk that import again, even if it was partially walked later\n            // during the same `patchAndUpgradeTree` call.\n            const clonedVisitedImports = new Set(visitedImports);\n            visitedImports.delete(importNode);\n\n            this.patchAndUpgradeTree(importNode, {visitedImports, upgrade});\n          });\n        }\n      } else {\n        elements.push(element);\n      }\n    };\n\n    // `walkDeepDescendantElements` populates (and internally checks against)\n    // `visitedImports` when traversing a loaded import.\n    Utilities.walkDeepDescendantElements(root, gatherElements, visitedImports);\n\n    if (this._hasPatches) {\n      for (let i = 0; i < elements.length; i++) {\n        this.patch(elements[i]);\n      }\n    }\n\n    for (let i = 0; i < elements.length; i++) {\n      upgrade(elements[i]);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  upgradeElement(element) {\n    const currentState = element.__CE_state;\n    if (currentState !== undefined) return;\n\n    const definition = this.localNameToDefinition(element.localName);\n    if (!definition) return;\n\n    definition.constructionStack.push(element);\n\n    const constructor = definition.constructor;\n    try {\n      try {\n        let result = new (constructor)();\n        if (result !== element) {\n          throw new Error('The custom element constructor did not produce the element being upgraded.');\n        }\n      } finally {\n        definition.constructionStack.pop();\n      }\n    } catch (e) {\n      element.__CE_state = CEState.failed;\n      throw e;\n    }\n\n    element.__CE_state = CEState.custom;\n    element.__CE_definition = definition;\n\n    if (definition.attributeChangedCallback) {\n      const observedAttributes = definition.observedAttributes;\n      for (let i = 0; i < observedAttributes.length; i++) {\n        const name = observedAttributes[i];\n        const value = element.getAttribute(name);\n        if (value !== null) {\n          this.attributeChangedCallback(element, name, null, value, null);\n        }\n      }\n    }\n\n    if (Utilities.isConnected(element)) {\n      this.connectedCallback(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  connectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.connectedCallback) {\n      definition.connectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  disconnectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.disconnectedCallback) {\n      definition.disconnectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   * @param {string} name\n   * @param {?string} oldValue\n   * @param {?string} newValue\n   * @param {?string} namespace\n   */\n  attributeChangedCallback(element, name, oldValue, newValue, namespace) {\n    const definition = element.__CE_definition;\n    if (\n      definition.attributeChangedCallback &&\n      definition.observedAttributes.indexOf(name) > -1\n    ) {\n      definition.attributeChangedCallback.call(element, name, oldValue, newValue, namespace);\n    }\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\n\nexport default class DocumentConstructionObserver {\n  constructor(internals, doc) {\n    /**\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @type {!Document}\n     */\n    this._document = doc;\n\n    /**\n     * @type {MutationObserver|undefined}\n     */\n    this._observer = undefined;\n\n\n    // Simulate tree construction for all currently accessible nodes in the\n    // document.\n    this._internals.patchAndUpgradeTree(this._document);\n\n    if (this._document.readyState === 'loading') {\n      this._observer = new MutationObserver(this._handleMutations.bind(this));\n\n      // Nodes created by the parser are given to the observer *before* the next\n      // task runs. Inline scripts are run in a new task. This means that the\n      // observer will be able to handle the newly parsed nodes before the inline\n      // script is run.\n      this._observer.observe(this._document, {\n        childList: true,\n        subtree: true,\n      });\n    }\n  }\n\n  disconnect() {\n    if (this._observer) {\n      this._observer.disconnect();\n    }\n  }\n\n  /**\n   * @param {!Array<!MutationRecord>} mutations\n   */\n  _handleMutations(mutations) {\n    // Once the document's `readyState` is 'interactive' or 'complete', all new\n    // nodes created within that document will be the result of script and\n    // should be handled by patching.\n    const readyState = this._document.readyState;\n    if (readyState === 'interactive' || readyState === 'complete') {\n      this.disconnect();\n    }\n\n    for (let i = 0; i < mutations.length; i++) {\n      const addedNodes = mutations[i].addedNodes;\n      for (let j = 0; j < addedNodes.length; j++) {\n        const node = addedNodes[j];\n        this._internals.patchAndUpgradeTree(node);\n      }\n    }\n  }\n}\n","/**\n * @template T\n */\nexport default class Deferred {\n  constructor() {\n    /**\n     * @private\n     * @type {T|undefined}\n     */\n    this._value = undefined;\n\n    /**\n     * @private\n     * @type {Function|undefined}\n     */\n    this._resolve = undefined;\n\n    /**\n     * @private\n     * @type {!Promise<T>}\n     */\n    this._promise = new Promise(resolve => {\n      this._resolve = resolve;\n\n      if (this._value) {\n        resolve(this._value);\n      }\n    });\n  }\n\n  /**\n   * @param {T} value\n   */\n  resolve(value) {\n    if (this._value) {\n      throw new Error('Already resolved.');\n    }\n\n    this._value = value;\n\n    if (this._resolve) {\n      this._resolve(value);\n    }\n  }\n\n  /**\n   * @return {!Promise<T>}\n   */\n  toPromise() {\n    return this._promise;\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\nimport DocumentConstructionObserver from './DocumentConstructionObserver.js';\nimport Deferred from './Deferred.js';\nimport * as Utilities from './Utilities.js';\n\n/**\n * @unrestricted\n */\nexport default class CustomElementRegistry {\n\n  /**\n   * @param {!CustomElementInternals} internals\n   */\n  constructor(internals) {\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._elementDefinitionIsRunning = false;\n\n    /**\n     * @private\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @private\n     * @type {!Map<string, !Deferred<undefined>>}\n     */\n    this._whenDefinedDeferred = new Map();\n\n    /**\n     * The default flush callback triggers the document walk synchronously.\n     * @private\n     * @type {!Function}\n     */\n    this._flushCallback = fn => fn();\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._flushPending = false;\n\n    /**\n     * @private\n     * @type {!Array<!CustomElementDefinition>}\n     */\n    this._pendingDefinitions = [];\n\n    /**\n     * @private\n     * @type {!DocumentConstructionObserver}\n     */\n    this._documentConstructionObserver = new DocumentConstructionObserver(internals, document);\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!Function} constructor\n   */\n  define(localName, constructor) {\n    if (!(constructor instanceof Function)) {\n      throw new TypeError('Custom element constructors must be functions.');\n    }\n\n    if (!Utilities.isValidCustomElementName(localName)) {\n      throw new SyntaxError(`The element name '${localName}' is not valid.`);\n    }\n\n    if (this._internals.localNameToDefinition(localName)) {\n      throw new Error(`A custom element with name '${localName}' has already been defined.`);\n    }\n\n    if (this._elementDefinitionIsRunning) {\n      throw new Error('A custom element is already being defined.');\n    }\n    this._elementDefinitionIsRunning = true;\n\n    let connectedCallback;\n    let disconnectedCallback;\n    let adoptedCallback;\n    let attributeChangedCallback;\n    let observedAttributes;\n    try {\n      /** @type {!Object} */\n      const prototype = constructor.prototype;\n      if (!(prototype instanceof Object)) {\n        throw new TypeError('The custom element constructor\\'s prototype is not an object.');\n      }\n\n      function getCallback(name) {\n        const callbackValue = prototype[name];\n        if (callbackValue !== undefined && !(callbackValue instanceof Function)) {\n          throw new Error(`The '${name}' callback must be a function.`);\n        }\n        return callbackValue;\n      }\n\n      connectedCallback = getCallback('connectedCallback');\n      disconnectedCallback = getCallback('disconnectedCallback');\n      adoptedCallback = getCallback('adoptedCallback');\n      attributeChangedCallback = getCallback('attributeChangedCallback');\n      observedAttributes = constructor['observedAttributes'] || [];\n    } catch (e) {\n      return;\n    } finally {\n      this._elementDefinitionIsRunning = false;\n    }\n\n    const definition = {\n      localName,\n      constructor,\n      connectedCallback,\n      disconnectedCallback,\n      adoptedCallback,\n      attributeChangedCallback,\n      observedAttributes,\n      constructionStack: [],\n    };\n\n    this._pendingDefinitions.push(definition);\n\n    // If we've already called the flush callback and it hasn't called back yet,\n    // don't call it again.\n    if (!this._flushPending) {\n      this._flushPending = true;\n      this._flushCallback(() => this._flush());\n    }\n  }\n\n  _flush() {\n    // If no new definitions were defined, don't attempt to flush. This could\n    // happen if a flush callback keeps the function it is given and calls it\n    // multiple times.\n    if (this._flushPending === false) return;\n    this._flushPending = false;\n\n    const pendingDefinitions = this._pendingDefinitions;\n    /** @type {!Map<string, !Array<!Element>>} */\n    const localNameToUpgradableElements = new Map();\n    for (let i = 0; i < pendingDefinitions.length; i++) {\n      localNameToUpgradableElements.set(pendingDefinitions[i].localName, []);\n    }\n\n    this._internals.patchAndUpgradeTree(document, {\n      upgrade: element => {\n        // Attempt to upgrade using *non-pending* definitions.\n        this._internals.upgradeElement(element);\n\n        // If the element was upgraded, then no pending definition applies to it.\n        if (element.__CE_state !== undefined) return;\n\n        // If there is an applicable pending definition for the element, add the\n        // element to the set of upgradable elements for that definition.\n        let upgradableElements = localNameToUpgradableElements.get(element.localName);\n        if (upgradableElements) {\n          upgradableElements.push(element);\n        }\n      },\n    });\n\n    while (pendingDefinitions.length > 0) {\n      const definition = pendingDefinitions.shift();\n      const localName = definition.localName;\n\n      this._internals.setDefinition(localName, definition);\n\n      // Attempt to upgrade all applicable elements.\n      const upgradableElements = localNameToUpgradableElements.get(definition.localName);\n      for (let i = 0; i < upgradableElements.length; i++) {\n        this._internals.upgradeElement(upgradableElements[i]);\n      }\n\n      // Resolve any promises created by `whenDefined` for the definition.\n      const deferred = this._whenDefinedDeferred.get(localName);\n      if (deferred) {\n        deferred.resolve(undefined);\n      }\n    }\n  }\n\n  /**\n   * @param {string} localName\n   * @return {Function|undefined}\n   */\n  get(localName) {\n    const definition = this._internals.localNameToDefinition(localName);\n    if (definition) {\n      return definition.constructor;\n    }\n\n    return undefined;\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!Promise<undefined>}\n   */\n  whenDefined(localName) {\n    if (!Utilities.isValidCustomElementName(localName)) {\n      return Promise.reject(new SyntaxError(`'${localName}' is not a valid custom element name.`));\n    }\n\n    const prior = this._whenDefinedDeferred.get(localName);\n    if (prior) {\n      return prior.toPromise();\n    }\n\n    const deferred = new Deferred();\n    this._whenDefinedDeferred.set(localName, deferred);\n\n    const definition = this._internals.localNameToDefinition(localName);\n    // Resolve immediately only if the given local name has a definition *and*\n    // the full document walk to upgrade elements with that local name has\n    // already happened.\n    if (definition && !this._pendingDefinitions.some(d => d.localName === localName)) {\n      deferred.resolve(undefined);\n    }\n\n    return deferred.toPromise();\n  }\n\n  polyfillWrapFlushCallback(outer) {\n    this._documentConstructionObserver.disconnect();\n    const inner = this._flushCallback;\n    this._flushCallback = flush => outer(() => inner(flush));\n  }\n}\n\n// Closure compiler exports.\nwindow['CustomElementRegistry'] = CustomElementRegistry;\nCustomElementRegistry.prototype['define'] = CustomElementRegistry.prototype.define;\nCustomElementRegistry.prototype['get'] = CustomElementRegistry.prototype.get;\nCustomElementRegistry.prototype['whenDefined'] = CustomElementRegistry.prototype.whenDefined;\nCustomElementRegistry.prototype['polyfillWrapFlushCallback'] = CustomElementRegistry.prototype.polyfillWrapFlushCallback;\n","export default {\n  Document_createElement: window.Document.prototype.createElement,\n  Document_createElementNS: window.Document.prototype.createElementNS,\n  Document_importNode: window.Document.prototype.importNode,\n  Document_prepend: window.Document.prototype['prepend'],\n  Document_append: window.Document.prototype['append'],\n  Node_cloneNode: window.Node.prototype.cloneNode,\n  Node_appendChild: window.Node.prototype.appendChild,\n  Node_insertBefore: window.Node.prototype.insertBefore,\n  Node_removeChild: window.Node.prototype.removeChild,\n  Node_replaceChild: window.Node.prototype.replaceChild,\n  Node_textContent: Object.getOwnPropertyDescriptor(window.Node.prototype, 'textContent'),\n  Element_attachShadow: window.Element.prototype['attachShadow'],\n  Element_innerHTML: Object.getOwnPropertyDescriptor(window.Element.prototype, 'innerHTML'),\n  Element_getAttribute: window.Element.prototype.getAttribute,\n  Element_setAttribute: window.Element.prototype.setAttribute,\n  Element_removeAttribute: window.Element.prototype.removeAttribute,\n  Element_getAttributeNS: window.Element.prototype.getAttributeNS,\n  Element_setAttributeNS: window.Element.prototype.setAttributeNS,\n  Element_removeAttributeNS: window.Element.prototype.removeAttributeNS,\n  Element_insertAdjacentElement: window.Element.prototype['insertAdjacentElement'],\n  Element_prepend: window.Element.prototype['prepend'],\n  Element_append: window.Element.prototype['append'],\n  Element_before: window.Element.prototype['before'],\n  Element_after: window.Element.prototype['after'],\n  Element_replaceWith: window.Element.prototype['replaceWith'],\n  Element_remove: window.Element.prototype['remove'],\n  HTMLElement: window.HTMLElement,\n  HTMLElement_innerHTML: Object.getOwnPropertyDescriptor(window.HTMLElement.prototype, 'innerHTML'),\n  HTMLElement_insertAdjacentElement: window.HTMLElement.prototype['insertAdjacentElement'],\n};\n","/**\n * This class exists only to work around Closure's lack of a way to describe\n * singletons. It represents the 'already constructed marker' used in custom\n * element construction stacks.\n *\n * https://html.spec.whatwg.org/#concept-already-constructed-marker\n */\nclass AlreadyConstructedMarker {}\n\nexport default new AlreadyConstructedMarker();\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport AlreadyConstructedMarker from '../AlreadyConstructedMarker.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  window['HTMLElement'] = (function() {\n    /**\n     * @type {function(new: HTMLElement): !HTMLElement}\n     */\n    function HTMLElement() {\n      // This should really be `new.target` but `new.target` can't be emulated\n      // in ES5. Assuming the user keeps the default value of the constructor's\n      // prototype's `constructor` property, this is equivalent.\n      /** @type {!Function} */\n      const constructor = this.constructor;\n\n      const definition = internals.constructorToDefinition(constructor);\n      if (!definition) {\n        throw new Error('The custom element being constructed was not registered with `customElements`.');\n      }\n\n      const constructionStack = definition.constructionStack;\n\n      if (constructionStack.length === 0) {\n        const element = Native.Document_createElement.call(document, definition.localName);\n        Object.setPrototypeOf(element, constructor.prototype);\n        element.__CE_state = CEState.custom;\n        element.__CE_definition = definition;\n        internals.patch(element);\n        return element;\n      }\n\n      const lastIndex = constructionStack.length - 1;\n      const element = constructionStack[lastIndex];\n      if (element === AlreadyConstructedMarker) {\n        throw new Error('The HTMLElement constructor was either called reentrantly for this constructor or called multiple times.');\n      }\n      constructionStack[lastIndex] = AlreadyConstructedMarker;\n\n      Object.setPrototypeOf(element, constructor.prototype);\n      internals.patch(/** @type {!HTMLElement} */ (element));\n\n      return element;\n    }\n\n    HTMLElement.prototype = Native.HTMLElement.prototype;\n\n    return HTMLElement;\n  })();\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   prepend: !function(...(!Node|string)),\n  *  append: !function(...(!Node|string)),\n * }}\n */\nlet ParentNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ParentNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['prepend'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.prepend.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['append'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.append.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElement',\n    /**\n     * @this {Document}\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElement.call(this, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'importNode',\n    /**\n     * @this {Document}\n     * @param {!Node} node\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(node, deep) {\n      const clone = Native.Document_importNode.call(this, node, deep);\n      // Only create custom elements if this document is associated with the registry.\n      if (!this.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  const NS_HTML = \"http://www.w3.org/1999/xhtml\";\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElementNS',\n    /**\n     * @this {Document}\n     * @param {?string} namespace\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(namespace, localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry && (namespace === null || namespace === NS_HTML)) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElementNS.call(this, namespace, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  PatchParentNode(internals, Document.prototype, {\n    prepend: Native.Document_prepend,\n    append: Native.Document_append,\n  });\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  // `Node#nodeValue` is implemented on `Attr`.\n  // `Node#textContent` is implemented on `Attr`, `Element`.\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'insertBefore',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @param {?Node} refNode\n     * @return {!Node}\n     */\n    function(node, refNode) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'appendChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_appendChild.call(this, node);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_appendChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'cloneNode',\n    /**\n     * @this {Node}\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(deep) {\n      const clone = Native.Node_cloneNode.call(this, deep);\n      // Only create custom elements if this element's owner document is\n      // associated with the registry.\n      if (!this.ownerDocument.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'removeChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_removeChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'replaceChild',\n    /**\n     * @this {Node}\n     * @param {!Node} nodeToInsert\n     * @param {!Node} nodeToRemove\n     * @return {!Node}\n     */\n    function(nodeToInsert, nodeToRemove) {\n      if (nodeToInsert instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(nodeToInsert.childNodes);\n        const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          internals.disconnectTree(nodeToRemove);\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeToInsertWasConnected = Utilities.isConnected(nodeToInsert);\n      const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n      const thisIsConnected = Utilities.isConnected(this);\n\n      if (thisIsConnected) {\n        internals.disconnectTree(nodeToRemove);\n      }\n\n      if (nodeToInsertWasConnected) {\n        internals.disconnectTree(nodeToInsert);\n      }\n\n      if (thisIsConnected) {\n        internals.connectTree(nodeToInsert);\n      }\n\n      return nativeResult;\n    });\n\n\n  function patch_textContent(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'textContent', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Node} */ function(assignedValue) {\n        // If this is a text node then there are no nodes to disconnect.\n        if (this.nodeType === Node.TEXT_NODE) {\n          baseDescriptor.set.call(this, assignedValue);\n          return;\n        }\n\n        let removedNodes = undefined;\n        // Checking for `firstChild` is faster than reading `childNodes.length`\n        // to compare with 0.\n        if (this.firstChild) {\n          // Using `childNodes` is faster than `children`, even though we only\n          // care about elements.\n          const childNodes = this.childNodes;\n          const childNodesLength = childNodes.length;\n          if (childNodesLength > 0 && Utilities.isConnected(this)) {\n            // Copying an array by iterating is faster than using slice.\n            removedNodes = new Array(childNodesLength);\n            for (let i = 0; i < childNodesLength; i++) {\n              removedNodes[i] = childNodes[i];\n            }\n          }\n        }\n\n        baseDescriptor.set.call(this, assignedValue);\n\n        if (removedNodes) {\n          for (let i = 0; i < removedNodes.length; i++) {\n            internals.disconnectTree(removedNodes[i]);\n          }\n        }\n      },\n    });\n  }\n\n  if (Native.Node_textContent && Native.Node_textContent.get) {\n    patch_textContent(Node.prototype, Native.Node_textContent);\n  } else {\n    internals.addPatch(function(element) {\n      patch_textContent(element, {\n        enumerable: true,\n        configurable: true,\n        // NOTE: This implementation of the `textContent` getter assumes that\n        // text nodes' `textContent` getter will not be patched.\n        get: /** @this {Node} */ function() {\n          /** @type {!Array<string>} */\n          const parts = [];\n\n          for (let i = 0; i < this.childNodes.length; i++) {\n            parts.push(this.childNodes[i].textContent);\n          }\n\n          return parts.join('');\n        },\n        set: /** @this {Node} */ function(assignedValue) {\n          while (this.firstChild) {\n            Native.Node_removeChild.call(this, this.firstChild);\n          }\n          Native.Node_appendChild.call(this, document.createTextNode(assignedValue));\n        },\n      });\n    });\n  }\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   before: !function(...(!Node|string)),\n *   after: !function(...(!Node|string)),\n *   replaceWith: !function(...(!Node|string)),\n *   remove: !function(),\n * }}\n */\nlet ChildNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ChildNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['before'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.before.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['after'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.after.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['replaceWith'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    const wasConnected = Utilities.isConnected(this);\n\n    builtIn.replaceWith.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (wasConnected) {\n      internals.disconnectTree(this);\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  destination['remove'] = function() {\n    const wasConnected = Utilities.isConnected(this);\n\n    builtIn.remove.call(this);\n\n    if (wasConnected) {\n      internals.disconnectTree(this);\n    }\n  };\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\nimport PatchChildNode from './Interface/ChildNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  if (Native.Element_attachShadow) {\n    Utilities.setPropertyUnchecked(Element.prototype, 'attachShadow',\n      /**\n       * @this {Element}\n       * @param {!{mode: string}} init\n       * @return {ShadowRoot}\n       */\n      function(init) {\n        const shadowRoot = Native.Element_attachShadow.call(this, init);\n        this.__CE_shadowRoot = shadowRoot;\n        return shadowRoot;\n      });\n  } else {\n    console.warn('Custom Elements: `Element#attachShadow` was not patched.');\n  }\n\n\n  function patch_innerHTML(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'innerHTML', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Element} */ function(htmlString) {\n        const isConnected = Utilities.isConnected(this);\n\n        // NOTE: In IE11, when using the native `innerHTML` setter, all nodes\n        // that were previously descendants of the context element have all of\n        // their children removed as part of the set - the entire subtree is\n        // 'disassembled'. This work around walks the subtree *before* using the\n        // native setter.\n        /** @type {!Array<!Element>|undefined} */\n        let removedElements = undefined;\n        if (isConnected) {\n          removedElements = [];\n          Utilities.walkDeepDescendantElements(this, element => {\n            if (element !== this) {\n              removedElements.push(element);\n            }\n          });\n        }\n\n        baseDescriptor.set.call(this, htmlString);\n\n        if (removedElements) {\n          for (let i = 0; i < removedElements.length; i++) {\n            const element = removedElements[i];\n            if (element.__CE_state === CEState.custom) {\n              internals.disconnectedCallback(element);\n            }\n          }\n        }\n\n        // Only create custom elements if this element's owner document is\n        // associated with the registry.\n        if (!this.ownerDocument.__CE_hasRegistry) {\n          internals.patchTree(this);\n        } else {\n          internals.patchAndUpgradeTree(this);\n        }\n        return htmlString;\n      },\n    });\n  }\n\n  if (Native.Element_innerHTML && Native.Element_innerHTML.get) {\n    patch_innerHTML(Element.prototype, Native.Element_innerHTML);\n  } else if (Native.HTMLElement_innerHTML && Native.HTMLElement_innerHTML.get) {\n    patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);\n  } else {\n\n    /** @type {HTMLDivElement} */\n    const rawDiv = Native.Document_createElement.call(document, 'div');\n\n    internals.addPatch(function(element) {\n      patch_innerHTML(element, {\n        enumerable: true,\n        configurable: true,\n        // Implements getting `innerHTML` by performing an unpatched `cloneNode`\n        // of the element and returning the resulting element's `innerHTML`.\n        // TODO: Is this too expensive?\n        get: /** @this {Element} */ function() {\n          return Native.Node_cloneNode.call(this, true).innerHTML;\n        },\n        // Implements setting `innerHTML` by creating an unpatched element,\n        // setting `innerHTML` of that element and replacing the target\n        // element's children with those of the unpatched element.\n        set: /** @this {Element} */ function(assignedValue) {\n          // NOTE: re-route to `content` for `template` elements.\n          // We need to do this because `template.appendChild` does not\n          // route into `template.content`.\n          /** @type {!Node} */\n          const content = this.localName === 'template' ? (/** @type {!HTMLTemplateElement} */ (this)).content : this;\n          rawDiv.innerHTML = assignedValue;\n\n          while (content.childNodes.length > 0) {\n            Native.Node_removeChild.call(content, content.childNodes[0]);\n          }\n          while (rawDiv.childNodes.length > 0) {\n            Native.Node_appendChild.call(content, rawDiv.childNodes[0]);\n          }\n        },\n      });\n    });\n  }\n\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttribute.call(this, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_setAttribute.call(this, name, newValue);\n      newValue = Native.Element_getAttribute.call(this, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, null);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(namespace, name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     */\n    function(name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttribute.call(this, name);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_removeAttribute.call(this, name);\n      if (oldValue !== null) {\n        internals.attributeChangedCallback(this, name, oldValue, null, null);\n      }\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     */\n    function(namespace, name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttributeNS.call(this, namespace, name);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_removeAttributeNS.call(this, namespace, name);\n      // In older browsers, `Element#getAttributeNS` may return the empty string\n      // instead of null if the attribute does not exist. For details, see;\n      // https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes\n      const newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      if (oldValue !== newValue) {\n        internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n      }\n    });\n\n\n  function patch_insertAdjacentElement(destination, baseMethod) {\n    Utilities.setPropertyUnchecked(destination, 'insertAdjacentElement',\n      /**\n       * @this {Element}\n       * @param {string} where\n       * @param {!Element} element\n       * @return {?Element}\n       */\n      function(where, element) {\n        const wasConnected = Utilities.isConnected(element);\n        const insertedElement = /** @type {!Element} */\n          (baseMethod.call(this, where, element));\n\n        if (wasConnected) {\n          internals.disconnectTree(element);\n        }\n\n        if (Utilities.isConnected(insertedElement)) {\n          internals.connectTree(element);\n        }\n        return insertedElement;\n      });\n  }\n\n  if (Native.HTMLElement_insertAdjacentElement) {\n    patch_insertAdjacentElement(HTMLElement.prototype, Native.HTMLElement_insertAdjacentElement);\n  } else if (Native.Element_insertAdjacentElement) {\n    patch_insertAdjacentElement(Element.prototype, Native.Element_insertAdjacentElement);\n  } else {\n    console.warn('Custom Elements: `Element#insertAdjacentElement` was not patched.');\n  }\n\n\n  PatchParentNode(internals, Element.prototype, {\n    prepend: Native.Element_prepend,\n    append: Native.Element_append,\n  });\n\n  PatchChildNode(internals, Element.prototype, {\n    before: Native.Element_before,\n    after: Native.Element_after,\n    replaceWith: Native.Element_replaceWith,\n    remove: Native.Element_remove,\n  });\n};\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\nimport CustomElementInternals from './CustomElementInternals.js';\nimport CustomElementRegistry from './CustomElementRegistry.js';\n\nimport PatchHTMLElement from './Patch/HTMLElement.js';\nimport PatchDocument from './Patch/Document.js';\nimport PatchNode from './Patch/Node.js';\nimport PatchElement from './Patch/Element.js';\n\nconst priorCustomElements = window['customElements'];\n\nif (!priorCustomElements ||\n     priorCustomElements['forcePolyfill'] ||\n     (typeof priorCustomElements['define'] != 'function') ||\n     (typeof priorCustomElements['get'] != 'function')) {\n  /** @type {!CustomElementInternals} */\n  const internals = new CustomElementInternals();\n\n  PatchHTMLElement(internals);\n  PatchDocument(internals);\n  PatchNode(internals);\n  PatchElement(internals);\n\n  // The main document is always associated with the registry.\n  document.__CE_hasRegistry = true;\n\n  /** @type {!CustomElementRegistry} */\n  const customElements = new CustomElementRegistry(internals);\n\n  Object.defineProperty(window, 'customElements', {\n    configurable: true,\n    enumerable: true,\n    value: customElements,\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/*\nExtremely simple css parser. Intended to be not more than what we need\nand definitely not necessarily correct =).\n*/\n\n'use strict';\n\n/** @unrestricted */\nclass StyleNode {\n  constructor() {\n    /** @type {number} */\n    this['start'] = 0;\n    /** @type {number} */\n    this['end'] = 0;\n    /** @type {StyleNode} */\n    this['previous'] = null;\n    /** @type {StyleNode} */\n    this['parent'] = null;\n    /** @type {Array<StyleNode>} */\n    this['rules'] = null;\n    /** @type {string} */\n    this['parsedCssText'] = '';\n    /** @type {string} */\n    this['cssText'] = '';\n    /** @type {boolean} */\n    this['atRule'] = false;\n    /** @type {number} */\n    this['type'] = 0;\n    /** @type {string} */\n    this['keyframesName'] = '';\n    /** @type {string} */\n    this['selector'] = '';\n    /** @type {string} */\n    this['parsedSelector'] = '';\n  }\n}\n\nexport {StyleNode}\n\n// given a string of css, return a simple rule tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nexport function parse(text) {\n  text = clean(text);\n  return parseCss(lex(text), text);\n}\n\n// remove stuff we don't care about that may hinder parsing\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction clean(cssText) {\n  return cssText.replace(RX.comments, '').replace(RX.port, '');\n}\n\n// super simple {...} lexer that returns a node tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nfunction lex(text) {\n  let root = new StyleNode();\n  root['start'] = 0;\n  root['end'] = text.length\n  let n = root;\n  for (let i = 0, l = text.length; i < l; i++) {\n    if (text[i] === OPEN_BRACE) {\n      if (!n['rules']) {\n        n['rules'] = [];\n      }\n      let p = n;\n      let previous = p['rules'][p['rules'].length - 1] || null;\n      n = new StyleNode();\n      n['start'] = i + 1;\n      n['parent'] = p;\n      n['previous'] = previous;\n      p['rules'].push(n);\n    } else if (text[i] === CLOSE_BRACE) {\n      n['end'] = i + 1;\n      n = n['parent'] || root;\n    }\n  }\n  return root;\n}\n\n// add selectors/cssText to node tree\n/**\n * @param {StyleNode} node\n * @param {string} text\n * @return {StyleNode}\n */\nfunction parseCss(node, text) {\n  let t = text.substring(node['start'], node['end'] - 1);\n  node['parsedCssText'] = node['cssText'] = t.trim();\n  if (node['parent']) {\n    let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];\n    t = text.substring(ss, node['start'] - 1);\n    t = _expandUnicodeEscapes(t);\n    t = t.replace(RX.multipleSpaces, ' ');\n    // TODO(sorvell): ad hoc; make selector include only after last ;\n    // helps with mixin syntax\n    t = t.substring(t.lastIndexOf(';') + 1);\n    let s = node['parsedSelector'] = node['selector'] = t.trim();\n    node['atRule'] = (s.indexOf(AT_START) === 0);\n    // note, support a subset of rule types...\n    if (node['atRule']) {\n      if (s.indexOf(MEDIA_START) === 0) {\n        node['type'] = types.MEDIA_RULE;\n      } else if (s.match(RX.keyframesRule)) {\n        node['type'] = types.KEYFRAMES_RULE;\n        node['keyframesName'] =\n          node['selector'].split(RX.multipleSpaces).pop();\n      }\n    } else {\n      if (s.indexOf(VAR_START) === 0) {\n        node['type'] = types.MIXIN_RULE;\n      } else {\n        node['type'] = types.STYLE_RULE;\n      }\n    }\n  }\n  let r$ = node['rules'];\n  if (r$) {\n    for (let i = 0, l = r$.length, r;\n      (i < l) && (r = r$[i]); i++) {\n      parseCss(r, text);\n    }\n  }\n  return node;\n}\n\n/**\n * conversion of sort unicode escapes with spaces like `\\33 ` (and longer) into\n * expanded form that doesn't require trailing space `\\000033`\n * @param {string} s\n * @return {string}\n */\nfunction _expandUnicodeEscapes(s) {\n  return s.replace(/\\\\([0-9a-f]{1,6})\\s/gi, function() {\n    let code = arguments[1],\n      repeat = 6 - code.length;\n    while (repeat--) {\n      code = '0' + code;\n    }\n    return '\\\\' + code;\n  });\n}\n\n/**\n * stringify parsed css.\n * @param {StyleNode} node\n * @param {boolean=} preserveProperties\n * @param {string=} text\n * @return {string}\n */\nexport function stringify(node, preserveProperties, text = '') {\n  // calc rule cssText\n  let cssText = '';\n  if (node['cssText'] || node['rules']) {\n    let r$ = node['rules'];\n    if (r$ && !_hasMixinRules(r$)) {\n      for (let i = 0, l = r$.length, r;\n        (i < l) && (r = r$[i]); i++) {\n        cssText = stringify(r, preserveProperties, cssText);\n      }\n    } else {\n      cssText = preserveProperties ? node['cssText'] :\n        removeCustomProps(node['cssText']);\n      cssText = cssText.trim();\n      if (cssText) {\n        cssText = '  ' + cssText + '\\n';\n      }\n    }\n  }\n  // emit rule if there is cssText\n  if (cssText) {\n    if (node['selector']) {\n      text += node['selector'] + ' ' + OPEN_BRACE + '\\n';\n    }\n    text += cssText;\n    if (node['selector']) {\n      text += CLOSE_BRACE + '\\n\\n';\n    }\n  }\n  return text;\n}\n\n/**\n * @param {Array<StyleNode>} rules\n * @return {boolean}\n */\nfunction _hasMixinRules(rules) {\n  let r = rules[0];\n  return Boolean(r) && Boolean(r['selector']) && r['selector'].indexOf(VAR_START) === 0;\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomProps(cssText) {\n  cssText = removeCustomPropAssignment(cssText);\n  return removeCustomPropApply(cssText);\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nexport function removeCustomPropAssignment(cssText) {\n  return cssText\n    .replace(RX.customProp, '')\n    .replace(RX.mixinProp, '');\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomPropApply(cssText) {\n  return cssText\n    .replace(RX.mixinApply, '')\n    .replace(RX.varApply, '');\n}\n\n/** @enum {number} */\nexport const types = {\n  STYLE_RULE: 1,\n  KEYFRAMES_RULE: 7,\n  MEDIA_RULE: 4,\n  MIXIN_RULE: 1000\n}\n\nconst OPEN_BRACE = '{';\nconst CLOSE_BRACE = '}';\n\n// helper regexp's\nconst RX = {\n  comments: /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//gim,\n  port: /@import[^;]*;/gim,\n  customProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?(?:[;\\n]|$)/gim,\n  mixinProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?{[^}]*?}(?:[;\\n]|$)?/gim,\n  mixinApply: /@apply\\s*\\(?[^);]*\\)?\\s*(?:[;\\n]|$)?/gim,\n  varApply: /[^;:]*?:[^;]*?var\\([^;]*\\)(?:[;\\n]|$)?/gim,\n  keyframesRule: /^@[^\\s]*keyframes/,\n  multipleSpaces: /\\s+/g\n}\n\nconst VAR_START = '--';\nconst MEDIA_START = '@media';\nconst AT_START = '@';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport let nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);\nexport let nativeCssVariables;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n  if (settings && settings['shimcssproperties']) {\n    nativeCssVariables = false;\n  } else {\n    // chrome 49 has semi-working css vars, check if box-shadow works\n    // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n    // However, shim css custom properties are only supported with ShadyDOM enabled,\n    // so fall back on native if we do not detect ShadyDOM\n    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match('AppleWebKit/601') &&\n      window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));\n  }\n}\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n  nativeCssVariables = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n  calcCssVariables(window.ShadyCSS);\n  // reset window variable to let ShadyCSS API take its place\n  window.ShadyCSS = undefined;\n} else {\n  calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport const VAR_ASSIGN = /(?:^|[;\\s{]\\s*)(--[\\w-]*?)\\s*:\\s*(?:((?:'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\([^)]*?\\)|[^};{])+)|\\{([^}]*)\\}(?:(?=[;\\s}])|$))/gi;\nexport const MIXIN_MATCH = /(?:^|\\W+)@apply\\s*\\(?([^);\\n]*)\\)?/gi;\nexport const VAR_CONSUMED = /(--[\\w-]+)\\s*([:,;)]|$)/gi;\nexport const ANIMATION_MATCH = /(animation\\s*:)|(animation-name\\s*:)/;\nexport const MEDIA_MATCH = /@media\\s(.*)/;\nexport const IS_VAR = /^--/;\nexport const BRACKETED = /\\{[^}]*\\}/g;\nexport const HOST_PREFIX = '(?:^|[^.#[:])';\nexport const HOST_SUFFIX = '($|[.:[\\\\s>+~])';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow, nativeCssVariables} from './style-settings.js'\nimport {parse, stringify, types, StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport {MEDIA_MATCH} from './common-regex.js';\n\n/**\n * @param {string|StyleNode} rules\n * @param {function(StyleNode)=} callback\n * @return {string}\n */\nexport function toCssText (rules, callback) {\n  if (!rules) {\n    return '';\n  }\n  if (typeof rules === 'string') {\n    rules = parse(rules);\n  }\n  if (callback) {\n    forEachRule(rules, callback);\n  }\n  return stringify(rules, nativeCssVariables);\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @return {StyleNode}\n */\nexport function rulesForStyle(style) {\n  if (!style['__cssRules'] && style.textContent) {\n    style['__cssRules'] = parse(style.textContent);\n  }\n  return style['__cssRules'] || null;\n}\n\n// Tests if a rule is a keyframes selector, which looks almost exactly\n// like a normal selector but is not (it has nothing to do with scoping\n// for example).\n/**\n * @param {StyleNode} rule\n * @return {boolean}\n */\nexport function isKeyframesSelector(rule) {\n  return Boolean(rule['parent']) &&\n  rule['parent']['type'] === types.KEYFRAMES_RULE;\n}\n\n/**\n * @param {StyleNode} node\n * @param {Function=} styleRuleCallback\n * @param {Function=} keyframesRuleCallback\n * @param {boolean=} onlyActiveRules\n */\nexport function forEachRule(node, styleRuleCallback, keyframesRuleCallback, onlyActiveRules) {\n  if (!node) {\n    return;\n  }\n  let skipRules = false;\n  let type = node['type'];\n  if (onlyActiveRules) {\n    if (type === types.MEDIA_RULE) {\n      let matchMedia = node['selector'].match(MEDIA_MATCH);\n      if (matchMedia) {\n        // if rule is a non matching @media rule, skip subrules\n        if (!window.matchMedia(matchMedia[1]).matches) {\n          skipRules = true;\n        }\n      }\n    }\n  }\n  if (type === types.STYLE_RULE) {\n    styleRuleCallback(node);\n  } else if (keyframesRuleCallback &&\n    type === types.KEYFRAMES_RULE) {\n    keyframesRuleCallback(node);\n  } else if (type === types.MIXIN_RULE) {\n    skipRules = true;\n  }\n  let r$ = node['rules'];\n  if (r$ && !skipRules) {\n    for (let i=0, l=r$.length, r; (i<l) && (r=r$[i]); i++) {\n      forEachRule(r, styleRuleCallback, keyframesRuleCallback, onlyActiveRules);\n    }\n  }\n}\n\n// add a string of cssText to the document.\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @param {Node} target\n * @param {Node} contextNode\n * @return {HTMLStyleElement}\n */\nexport function applyCss(cssText, moniker, target, contextNode) {\n  let style = createScopeStyle(cssText, moniker);\n  applyStyle(style, target, contextNode);\n  return style;\n}\n\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @return {HTMLStyleElement}\n */\nexport function createScopeStyle(cssText, moniker) {\n  let style = /** @type {HTMLStyleElement} */(document.createElement('style'));\n  if (moniker) {\n    style.setAttribute('scope', moniker);\n  }\n  style.textContent = cssText;\n  return style;\n}\n\n/**\n * Track the position of the last added style for placing placeholders\n * @type {Node}\n */\nlet lastHeadApplyNode = null;\n\n// insert a comment node as a styling position placeholder.\n/**\n * @param {string} moniker\n * @return {!Comment}\n */\nexport function applyStylePlaceHolder(moniker) {\n  let placeHolder = document.createComment(' Shady DOM styles for ' +\n    moniker + ' ');\n  let after = lastHeadApplyNode ?\n    lastHeadApplyNode['nextSibling'] : null;\n  let scope = document.head;\n  scope.insertBefore(placeHolder, after || scope.firstChild);\n  lastHeadApplyNode = placeHolder;\n  return placeHolder;\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @param {?Node} target\n * @param {?Node} contextNode\n */\nexport function applyStyle(style, target, contextNode) {\n  target = target || document.head;\n  let after = (contextNode && contextNode.nextSibling) ||\n    target.firstChild;\n  target.insertBefore(style, after);\n  if (!lastHeadApplyNode) {\n    lastHeadApplyNode = style;\n  } else {\n    // only update lastHeadApplyNode if the new style is inserted after the old lastHeadApplyNode\n    let position = style.compareDocumentPosition(lastHeadApplyNode);\n    if (position === Node.DOCUMENT_POSITION_PRECEDING) {\n      lastHeadApplyNode = style;\n    }\n  }\n}\n\n/**\n * @param {string} buildType\n * @return {boolean}\n */\nexport function isTargetedBuild(buildType) {\n  return nativeShadow ? buildType === 'shadow' : buildType === 'shady';\n}\n\n/**\n * @param {Element} element\n * @return {?string}\n */\nexport function getCssBuildType(element) {\n  return element.getAttribute('css-build');\n}\n\n/**\n * Walk from text[start] matching parens and\n * returns position of the outer end paren\n * @param {string} text\n * @param {number} start\n * @return {number}\n */\nfunction findMatchingParen(text, start) {\n  let level = 0;\n  for (let i=start, l=text.length; i < l; i++) {\n    if (text[i] === '(') {\n      level++;\n    } else if (text[i] === ')') {\n      if (--level === 0) {\n        return i;\n      }\n    }\n  }\n  return -1;\n}\n\n/**\n * @param {string} str\n * @param {function(string, string, string, string)} callback\n */\nexport function processVariableAndFallback(str, callback) {\n  // find 'var('\n  let start = str.indexOf('var(');\n  if (start === -1) {\n    // no var?, everything is prefix\n    return callback(str, '', '', '');\n  }\n  //${prefix}var(${inner})${suffix}\n  let end = findMatchingParen(str, start + 3);\n  let inner = str.substring(start + 4, end);\n  let prefix = str.substring(0, start);\n  // suffix may have other variables\n  let suffix = processVariableAndFallback(str.substring(end + 1), callback);\n  let comma = inner.indexOf(',');\n  // value and fallback args should be trimmed to match in property lookup\n  if (comma === -1) {\n    // variable, no fallback\n    return callback(prefix, inner.trim(), '', suffix);\n  }\n  // var(${value},${fallback})\n  let value = inner.substring(0, comma).trim();\n  let fallback = inner.substring(comma + 1).trim();\n  return callback(prefix, value, fallback, suffix);\n}\n\n/**\n * @param {Element} element\n * @param {string} value\n */\nexport function setElementClassRaw(element, value) {\n  // use native setAttribute provided by ShadyDOM when setAttribute is patched\n  if (nativeShadow) {\n    element.setAttribute('class', value);\n  } else {\n    window['ShadyDOM']['nativeMethods']['setAttribute'].call(element, 'class', value);\n  }\n}\n\n/**\n * @param {Element | {is: string, extends: string}} element\n * @return {{is: string, typeExtension: string}}\n */\nexport function getIsExtends(element) {\n  let localName = element['localName'];\n  let is = '', typeExtension = '';\n  /*\n  NOTE: technically, this can be wrong for certain svg elements\n  with `-` in the name like `<font-face>`\n  */\n  if (localName) {\n    if (localName.indexOf('-') > -1) {\n      is = localName;\n    } else {\n      typeExtension = localName;\n      is = (element.getAttribute && element.getAttribute('is')) || '';\n    }\n  } else {\n    is = /** @type {?} */(element).is;\n    typeExtension = /** @type {?} */(element).extends;\n  }\n  return {is, typeExtension};\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport * as StyleUtil from './style-util.js'\nimport {nativeShadow} from './style-settings.js'\n\n/* Transforms ShadowDOM styling into ShadyDOM styling\n\n* scoping:\n\n  * elements in scope get scoping selector class=\"x-foo-scope\"\n  * selectors re-written as follows:\n\n    div button -> div.x-foo-scope button.x-foo-scope\n\n* :host -> scopeName\n\n* :host(...) -> scopeName...\n\n* ::slotted(...) -> scopeName > ...\n\n* ...:dir(ltr|rtl) -> [dir=\"ltr|rtl\"] ..., ...[dir=\"ltr|rtl\"]\n\n* :host(:dir[rtl]) -> scopeName:dir(rtl) -> [dir=\"rtl\"] scopeName, scopeName[dir=\"rtl\"]\n\n*/\nconst SCOPE_NAME = 'style-scope';\n\nclass StyleTransformer {\n  get SCOPE_NAME() {\n    return SCOPE_NAME;\n  }\n  // Given a node and scope name, add a scoping class to each node\n  // in the tree. This facilitates transforming css into scoped rules.\n  dom(node, scope, shouldRemoveScope) {\n    // one time optimization to skip scoping...\n    if (node['__styleScoped']) {\n      node['__styleScoped'] = null;\n    } else {\n      this._transformDom(node, scope || '', shouldRemoveScope);\n    }\n  }\n\n  _transformDom(node, selector, shouldRemoveScope) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      this.element(node, selector, shouldRemoveScope);\n    }\n    let c$ = (node.localName === 'template') ?\n      (node.content || node._content).childNodes :\n      node.children || node.childNodes;\n    if (c$) {\n      for (let i=0; i<c$.length; i++) {\n        this._transformDom(c$[i], selector, shouldRemoveScope);\n      }\n    }\n  }\n\n  element(element, scope, shouldRemoveScope) {\n    // note: if using classes, we add both the general 'style-scope' class\n    // as well as the specific scope. This enables easy filtering of all\n    // `style-scope` elements\n    if (scope) {\n      // note: svg on IE does not have classList so fallback to class\n      if (element.classList) {\n        if (shouldRemoveScope) {\n          element.classList.remove(SCOPE_NAME);\n          element.classList.remove(scope);\n        } else {\n          element.classList.add(SCOPE_NAME);\n          element.classList.add(scope);\n        }\n      } else if (element.getAttribute) {\n        let c = element.getAttribute(CLASS);\n        if (shouldRemoveScope) {\n          if (c) {\n            let newValue = c.replace(SCOPE_NAME, '').replace(scope, '');\n            StyleUtil.setElementClassRaw(element, newValue);\n          }\n        } else {\n          let newValue = (c ? c + ' ' : '') + SCOPE_NAME + ' ' + scope;\n          StyleUtil.setElementClassRaw(element, newValue);\n        }\n      }\n    }\n  }\n\n  elementStyles(element, styleRules, callback) {\n    let cssBuildType = element['__cssBuild'];\n    // no need to shim selectors if settings.useNativeShadow, also\n    // a shady css build will already have transformed selectors\n    // NOTE: This method may be called as part of static or property shimming.\n    // When there is a targeted build it will not be called for static shimming,\n    // but when the property shim is used it is called and should opt out of\n    // static shimming work when a proper build exists.\n    let cssText = '';\n    if (nativeShadow || cssBuildType === 'shady') {\n      cssText = StyleUtil.toCssText(styleRules, callback);\n    } else {\n      let {is, typeExtension} = StyleUtil.getIsExtends(element);\n      cssText = this.css(styleRules, is, typeExtension, callback) + '\\n\\n';\n    }\n    return cssText.trim();\n  }\n\n  // Given a string of cssText and a scoping string (scope), returns\n  // a string of scoped css where each selector is transformed to include\n  // a class created from the scope. ShadowDOM selectors are also transformed\n  // (e.g. :host) to use the scoping selector.\n  css(rules, scope, ext, callback) {\n    let hostScope = this._calcHostScope(scope, ext);\n    scope = this._calcElementScope(scope);\n    let self = this;\n    return StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      if (!rule.isScoped) {\n        self.rule(rule, scope, hostScope);\n        rule.isScoped = true;\n      }\n      if (callback) {\n        callback(rule, scope, hostScope);\n      }\n    });\n  }\n\n  _calcElementScope(scope) {\n    if (scope) {\n      return CSS_CLASS_PREFIX + scope;\n    } else {\n      return '';\n    }\n  }\n\n  _calcHostScope(scope, ext) {\n    return ext ? `[is=${scope}]` : scope;\n  }\n\n  rule(rule, scope, hostScope) {\n    this._transformRule(rule, this._transformComplexSelector,\n      scope, hostScope);\n  }\n\n  /**\n   * transforms a css rule to a scoped rule.\n   *\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRule(rule, transformer, scope, hostScope) {\n    // NOTE: save transformedSelector for subsequent matching of elements\n    // against selectors (e.g. when calculating style properties)\n    rule['selector'] = rule.transformedSelector =\n      this._transformRuleCss(rule, transformer, scope, hostScope);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRuleCss(rule, transformer, scope, hostScope) {\n    let p$ = rule['selector'].split(COMPLEX_SELECTOR_SEP);\n    // we want to skip transformation of rules that appear in keyframes,\n    // because they are keyframe selectors, not element selectors.\n    if (!StyleUtil.isKeyframesSelector(rule)) {\n      for (let i=0, l=p$.length, p; (i<l) && (p=p$[i]); i++) {\n        p$[i] = transformer.call(this, p, scope, hostScope);\n      }\n    }\n    return p$.join(COMPLEX_SELECTOR_SEP);\n  }\n\n/**\n * @param {string} selector\n * @param {string} scope\n * @param {string=} hostScope\n */\n  _transformComplexSelector(selector, scope, hostScope) {\n    let stop = false;\n    selector = selector.trim();\n    // Remove spaces inside of selectors like `:nth-of-type` because it confuses SIMPLE_SELECTOR_SEP\n    selector = selector.replace(NTH, (m, type, inner) => `:${type}(${inner.replace(/\\s/g, '')})`);\n    selector = selector.replace(SLOTTED_START, `${HOST} $1`);\n    selector = selector.replace(SIMPLE_SELECTOR_SEP, (m, c, s) => {\n      if (!stop) {\n        let info = this._transformCompoundSelector(s, c, scope, hostScope);\n        stop = stop || info.stop;\n        c = info.combinator;\n        s = info.value;\n      }\n      return c + s;\n    });\n    return selector;\n  }\n\n  _transformCompoundSelector(selector, combinator, scope, hostScope) {\n    // replace :host with host scoping class\n    let slottedIndex = selector.indexOf(SLOTTED);\n    if (selector.indexOf(HOST) >= 0) {\n      selector = this._transformHostSelector(selector, hostScope);\n    // replace other selectors with scoping class\n    } else if (slottedIndex !== 0) {\n      selector = scope ? this._transformSimpleSelector(selector, scope) :\n        selector;\n    }\n    // mark ::slotted() scope jump to replace with descendant selector + arg\n    // also ignore left-side combinator\n    let slotted = false;\n    if (slottedIndex >= 0) {\n      combinator = '';\n      slotted = true;\n    }\n    // process scope jumping selectors up to the scope jump and then stop\n    let stop;\n    if (slotted) {\n      stop = true;\n      if (slotted) {\n        // .zonk ::slotted(.foo) -> .zonk.scope > .foo\n        selector = selector.replace(SLOTTED_PAREN, (m, paren) => ` > ${paren}`);\n      }\n    }\n    selector = selector.replace(DIR_PAREN, (m, before, dir) =>\n      `[dir=\"${dir}\"] ${before}, ${before}[dir=\"${dir}\"]`);\n    return {value: selector, combinator, stop};\n  }\n\n  _transformSimpleSelector(selector, scope) {\n    let p$ = selector.split(PSEUDO_PREFIX);\n    p$[0] += scope;\n    return p$.join(PSEUDO_PREFIX);\n  }\n\n  // :host(...) -> scopeName...\n  _transformHostSelector(selector, hostScope) {\n    let m = selector.match(HOST_PAREN);\n    let paren = m && m[2].trim() || '';\n    if (paren) {\n      if (!paren[0].match(SIMPLE_SELECTOR_PREFIX)) {\n        // paren starts with a type selector\n        let typeSelector = paren.split(SIMPLE_SELECTOR_PREFIX)[0];\n        // if the type selector is our hostScope then avoid pre-pending it\n        if (typeSelector === hostScope) {\n          return paren;\n        // otherwise, this selector should not match in this scope so\n        // output a bogus selector.\n        } else {\n          return SELECTOR_NO_MATCH;\n        }\n      } else {\n        // make sure to do a replace here to catch selectors like:\n        // `:host(.foo)::before`\n        return selector.replace(HOST_PAREN, function(m, host, paren) {\n          return hostScope + paren;\n        });\n      }\n    // if no paren, do a straight :host replacement.\n    // TODO(sorvell): this should not strictly be necessary but\n    // it's needed to maintain support for `:host[foo]` type selectors\n    // which have been improperly used under Shady DOM. This should be\n    // deprecated.\n    } else {\n      return selector.replace(HOST, hostScope);\n    }\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  documentRule(rule) {\n    // reset selector in case this is redone.\n    rule['selector'] = rule['parsedSelector'];\n    this.normalizeRootSelector(rule);\n    this._transformRule(rule, this._transformDocumentSelector);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  normalizeRootSelector(rule) {\n    if (rule['selector'] === ROOT) {\n      rule['selector'] = 'html';\n    }\n  }\n\n/**\n * @param {string} selector\n */\n  _transformDocumentSelector(selector) {\n    return selector.match(SLOTTED) ?\n      this._transformComplexSelector(selector, SCOPE_DOC_SELECTOR) :\n      this._transformSimpleSelector(selector.trim(), SCOPE_DOC_SELECTOR);\n  }\n}\n\nlet NTH = /:(nth[-\\w]+)\\(([^)]+)\\)/;\nlet SCOPE_DOC_SELECTOR = `:not(.${SCOPE_NAME})`;\nlet COMPLEX_SELECTOR_SEP = ',';\nlet SIMPLE_SELECTOR_SEP = /(^|[\\s>+~]+)((?:\\[.+?\\]|[^\\s>+~=[])+)/g;\nlet SIMPLE_SELECTOR_PREFIX = /[[.:#*]/;\nlet HOST = ':host';\nlet ROOT = ':root';\nlet SLOTTED = '::slotted';\nlet SLOTTED_START = new RegExp(`^(${SLOTTED})`);\n// NOTE: this supports 1 nested () pair for things like\n// :host(:not([selected]), more general support requires\n// parsing which seems like overkill\nlet HOST_PAREN = /(:host)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\n// similar to HOST_PAREN\nlet SLOTTED_PAREN = /(?:::slotted)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\nlet DIR_PAREN = /(.*):dir\\((?:(ltr|rtl))\\)/;\nlet CSS_CLASS_PREFIX = '.';\nlet PSEUDO_PREFIX = ':';\nlet CLASS = 'class';\nlet SELECTOR_NO_MATCH = 'should_not_match';\n\nexport default new StyleTransformer()","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\n\n/** @const {string} */\nconst infoKey = '__styleInfo';\n\nexport default class StyleInfo {\n  /**\n   * @param {Element} node\n   * @return {StyleInfo}\n   */\n  static get(node) {\n    if (node) {\n      return node[infoKey];\n    } else {\n      return null;\n    }\n  }\n  /**\n   * @param {!Element} node\n   * @param {StyleInfo} styleInfo\n   * @return {StyleInfo}\n   */\n  static set(node, styleInfo) {\n    node[infoKey] = styleInfo;\n    return styleInfo;\n  }\n  /**\n   * @param {StyleNode} ast\n   * @param {Node=} placeholder\n   * @param {Array<string>=} ownStylePropertyNames\n   * @param {string=} elementName\n   * @param {string=} typeExtension\n   * @param {string=} cssBuild\n   */\n  constructor(ast, placeholder, ownStylePropertyNames, elementName, typeExtension, cssBuild) {\n    /** @type {StyleNode} */\n    this.styleRules = ast || null;\n    /** @type {Node} */\n    this.placeholder = placeholder || null;\n    /** @type {!Array<string>} */\n    this.ownStylePropertyNames = ownStylePropertyNames || [];\n    /** @type {Array<Object>} */\n    this.overrideStyleProperties = null;\n    /** @type {string} */\n    this.elementName = elementName || '';\n    /** @type {string} */\n    this.cssBuild = cssBuild || '';\n    /** @type {string} */\n    this.typeExtension = typeExtension || '';\n    /** @type {Object<string, string>} */\n    this.styleProperties = null;\n    /** @type {?string} */\n    this.scopeSelector = null;\n    /** @type {HTMLStyleElement} */\n    this.customStyle = null;\n  }\n  _getStyleRules() {\n    return this.styleRules;\n  }\n}\n\nStyleInfo.prototype['_getStyleRules'] = StyleInfo.prototype._getStyleRules;","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {removeCustomPropAssignment, StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport {nativeShadow} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport * as StyleUtil from './style-util.js'\nimport * as RX from './common-regex.js'\nimport StyleInfo from './style-info.js'\n\n// TODO: dedupe with shady\n/**\n * @const {function(string):boolean}\n */\nconst matchesSelector = ((p) => p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\np.oMatchesSelector || p.webkitMatchesSelector)(window.Element.prototype);\n\nconst IS_IE = navigator.userAgent.match('Trident');\n\nconst XSCOPE_NAME = 'x-scope';\n\nclass StyleProperties {\n  get XSCOPE_NAME() {\n    return XSCOPE_NAME;\n  }\n/**\n * decorates styles with rule info and returns an array of used style property names\n *\n * @param {StyleNode} rules\n * @return {Array<string>}\n */\n  decorateStyles(rules) {\n    let self = this, props = {}, keyframes = [], ruleIndex = 0;\n    StyleUtil.forEachRule(rules, function(rule) {\n      self.decorateRule(rule);\n      // mark in-order position of ast rule in styles block, used for cache key\n      rule.index = ruleIndex++;\n      self.collectPropertiesInCssText(rule.propertyInfo.cssText, props);\n    }, function onKeyframesRule(rule) {\n      keyframes.push(rule);\n    });\n    // Cache all found keyframes rules for later reference:\n    rules._keyframes = keyframes;\n    // return this list of property names *consumes* in these styles.\n    let names = [];\n    for (let i in props) {\n      names.push(i);\n    }\n    return names;\n  }\n\n  // decorate a single rule with property info\n  decorateRule(rule) {\n    if (rule.propertyInfo) {\n      return rule.propertyInfo;\n    }\n    let info = {}, properties = {};\n    let hasProperties = this.collectProperties(rule, properties);\n    if (hasProperties) {\n      info.properties = properties;\n      // TODO(sorvell): workaround parser seeing mixins as additional rules\n      rule['rules'] = null;\n    }\n    info.cssText = this.collectCssText(rule);\n    rule.propertyInfo = info;\n    return info;\n  }\n\n  // collects the custom properties from a rule's cssText\n  collectProperties(rule, properties) {\n    let info = rule.propertyInfo;\n    if (info) {\n      if (info.properties) {\n        Object.assign(properties, info.properties);\n        return true;\n      }\n    } else {\n      let m, rx = RX.VAR_ASSIGN;\n      let cssText = rule['parsedCssText'];\n      let value;\n      let any;\n      while ((m = rx.exec(cssText))) {\n        // note: group 2 is var, 3 is mixin\n        value = (m[2] || m[3]).trim();\n        // value of 'inherit' or 'unset' is equivalent to not setting the property here\n        if (value !== 'inherit' || value !== 'unset') {\n          properties[m[1].trim()] = value;\n        }\n        any = true;\n      }\n      return any;\n    }\n\n  }\n\n  // returns cssText of properties that consume variables/mixins\n  collectCssText(rule) {\n    return this.collectConsumingCssText(rule['parsedCssText']);\n  }\n\n  // NOTE: we support consumption inside mixin assignment\n  // but not production, so strip out {...}\n  collectConsumingCssText(cssText) {\n    return cssText.replace(RX.BRACKETED, '')\n      .replace(RX.VAR_ASSIGN, '');\n  }\n\n  collectPropertiesInCssText(cssText, props) {\n    let m;\n    while ((m = RX.VAR_CONSUMED.exec(cssText))) {\n      let name = m[1];\n      // This regex catches all variable names, and following non-whitespace char\n      // If next char is not ':', then variable is a consumer\n      if (m[2] !== ':') {\n        props[name] = true;\n      }\n    }\n  }\n\n  // turns custom properties into realized values.\n  reify(props) {\n    // big perf optimization here: reify only *own* properties\n    // since this object has __proto__ of the element's scope properties\n    let names = Object.getOwnPropertyNames(props);\n    for (let i=0, n; i < names.length; i++) {\n      n = names[i];\n      props[n] = this.valueForProperty(props[n], props);\n    }\n  }\n\n  // given a property value, returns the reified value\n  // a property value may be:\n  // (1) a literal value like: red or 5px;\n  // (2) a variable value like: var(--a), var(--a, red), or var(--a, --b) or\n  // var(--a, var(--b));\n  // (3) a literal mixin value like { properties }. Each of these properties\n  // can have values that are: (a) literal, (b) variables, (c) @apply mixins.\n  valueForProperty(property, props) {\n    // case (1) default\n    // case (3) defines a mixin and we have to reify the internals\n    if (property) {\n      if (property.indexOf(';') >=0) {\n        property = this.valueForProperties(property, props);\n      } else {\n        // case (2) variable\n        let self = this;\n        let fn = function(prefix, value, fallback, suffix) {\n          if (!value) {\n            return prefix + suffix;\n          }\n          let propertyValue = self.valueForProperty(props[value], props);\n          // if value is \"initial\", then the variable should be treated as unset\n          if (!propertyValue || propertyValue === 'initial') {\n            // fallback may be --a or var(--a) or literal\n            propertyValue = self.valueForProperty(props[fallback] || fallback, props) ||\n            fallback;\n          } else if (propertyValue === 'apply-shim-inherit') {\n            // CSS build will replace `inherit` with `apply-shim-inherit`\n            // for use with native css variables.\n            // Since we have full control, we can use `inherit` directly.\n            propertyValue = 'inherit';\n          }\n          return prefix + (propertyValue || '') + suffix;\n        };\n        property = StyleUtil.processVariableAndFallback(property, fn);\n      }\n    }\n    return property && property.trim() || '';\n  }\n\n  // note: we do not yet support mixin within mixin\n  valueForProperties(property, props) {\n    let parts = property.split(';');\n    for (let i=0, p, m; i<parts.length; i++) {\n      if ((p = parts[i])) {\n        RX.MIXIN_MATCH.lastIndex = 0;\n        m = RX.MIXIN_MATCH.exec(p);\n        if (m) {\n          p = this.valueForProperty(props[m[1]], props);\n        } else {\n          let colon = p.indexOf(':');\n          if (colon !== -1) {\n            let pp = p.substring(colon);\n            pp = pp.trim();\n            pp = this.valueForProperty(pp, props) || pp;\n            p = p.substring(0, colon) + pp;\n          }\n        }\n        parts[i] = (p && p.lastIndexOf(';') === p.length - 1) ?\n          // strip trailing ;\n          p.slice(0, -1) :\n          p || '';\n      }\n    }\n    return parts.join(';');\n  }\n\n  applyProperties(rule, props) {\n    let output = '';\n    // dynamically added sheets may not be decorated so ensure they are.\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (rule.propertyInfo.cssText) {\n      output = this.valueForProperties(rule.propertyInfo.cssText, props);\n    }\n    rule['cssText'] = output;\n  }\n\n  // Apply keyframe transformations to the cssText of a given rule. The\n  // keyframeTransforms object is a map of keyframe names to transformer\n  // functions which take in cssText and spit out transformed cssText.\n  applyKeyframeTransforms(rule, keyframeTransforms) {\n    let input = rule['cssText'];\n    let output = rule['cssText'];\n    if (rule.hasAnimations == null) {\n      // Cache whether or not the rule has any animations to begin with:\n      rule.hasAnimations = RX.ANIMATION_MATCH.test(input);\n    }\n    // If there are no animations referenced, we can skip transforms:\n    if (rule.hasAnimations) {\n      let transform;\n      // If we haven't transformed this rule before, we iterate over all\n      // transforms:\n      if (rule.keyframeNamesToTransform == null) {\n        rule.keyframeNamesToTransform = [];\n        for (let keyframe in keyframeTransforms) {\n          transform = keyframeTransforms[keyframe];\n          output = transform(input);\n          // If the transform actually changed the CSS text, we cache the\n          // transform name for future use:\n          if (input !== output) {\n            input = output;\n            rule.keyframeNamesToTransform.push(keyframe);\n          }\n        }\n      } else {\n        // If we already have a list of keyframe names that apply to this\n        // rule, we apply only those keyframe name transforms:\n        for (let i = 0; i < rule.keyframeNamesToTransform.length; ++i) {\n          transform = keyframeTransforms[rule.keyframeNamesToTransform[i]];\n          input = transform(input);\n        }\n        output = input;\n      }\n    }\n    rule['cssText'] = output;\n  }\n\n  // Test if the rules in these styles matches the given `element` and if so,\n  // collect any custom properties into `props`.\n  /**\n   * @param {StyleNode} rules\n   * @param {Element} element\n   */\n  propertyDataFromStyles(rules, element) {\n    let props = {}, self = this;\n    // generates a unique key for these matches\n    let o = [];\n    // note: active rules excludes non-matching @media rules\n    StyleUtil.forEachRule(rules, function(rule) {\n      // TODO(sorvell): we could trim the set of rules at declaration\n      // time to only include ones that have properties\n      if (!rule.propertyInfo) {\n        self.decorateRule(rule);\n      }\n      // match element against transformedSelector: selector may contain\n      // unwanted uniquification and parsedSelector does not directly match\n      // for :host selectors.\n      let selectorToMatch = rule.transformedSelector || rule['parsedSelector'];\n      if (element && rule.propertyInfo.properties && selectorToMatch) {\n        if (matchesSelector.call(element, selectorToMatch)) {\n          self.collectProperties(rule, props);\n          // produce numeric key for these matches for lookup\n          addToBitMask(rule.index, o);\n        }\n      }\n    }, null, true);\n    return {properties: props, key: o};\n  }\n\n  /**\n   * @param {Element} scope\n   * @param {StyleNode} rule\n   * @param {string|undefined} cssBuild\n   * @param {function(Object)} callback\n   */\n  whenHostOrRootRule(scope, rule, cssBuild, callback) {\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (!rule.propertyInfo.properties) {\n      return;\n    }\n    let {is, typeExtension} = StyleUtil.getIsExtends(scope);\n    let hostScope = is ?\n      StyleTransformer._calcHostScope(is, typeExtension) :\n      'html';\n    let parsedSelector = rule['parsedSelector'];\n    let isRoot = (parsedSelector === ':host > *' || parsedSelector === 'html');\n    let isHost = parsedSelector.indexOf(':host') === 0 && !isRoot;\n    // build info is either in scope (when scope is an element) or in the style\n    // when scope is the default scope; note: this allows default scope to have\n    // mixed mode built and unbuilt styles.\n    if (cssBuild === 'shady') {\n      // :root -> x-foo > *.x-foo for elements and html for custom-style\n      isRoot = parsedSelector === (hostScope + ' > *.' + hostScope) || parsedSelector.indexOf('html') !== -1;\n      // :host -> x-foo for elements, but sub-rules have .x-foo in them\n      isHost = !isRoot && parsedSelector.indexOf(hostScope) === 0;\n    }\n    if (cssBuild === 'shadow') {\n      isRoot = parsedSelector === ':host > *' || parsedSelector === 'html';\n      isHost = isHost && !isRoot;\n    }\n    if (!isRoot && !isHost) {\n      return;\n    }\n    let selectorToMatch = hostScope;\n    if (isHost) {\n      // need to transform :host under ShadowDOM because `:host` does not work with `matches`\n      if (nativeShadow && !rule.transformedSelector) {\n        // transform :host into a matchable selector\n        rule.transformedSelector =\n        StyleTransformer._transformRuleCss(\n          rule,\n          StyleTransformer._transformComplexSelector,\n          StyleTransformer._calcElementScope(is),\n          hostScope\n        );\n      }\n      selectorToMatch = rule.transformedSelector || hostScope;\n    }\n    callback({\n      selector: selectorToMatch,\n      isHost: isHost,\n      isRoot: isRoot\n    });\n  }\n/**\n * @param {Element} scope\n * @param {StyleNode} rules\n * @return {Object}\n */\n  hostAndRootPropertiesForScope(scope, rules) {\n    let hostProps = {}, rootProps = {}, self = this;\n    // note: active rules excludes non-matching @media rules\n    let cssBuild = rules && rules['__cssBuild'];\n    StyleUtil.forEachRule(rules, function(rule) {\n      // if scope is StyleDefaults, use _element for matchesSelector\n      self.whenHostOrRootRule(scope, rule, cssBuild, function(info) {\n        let element = scope._element || scope;\n        if (matchesSelector.call(element, info.selector)) {\n          if (info.isHost) {\n            self.collectProperties(rule, hostProps);\n          } else {\n            self.collectProperties(rule, rootProps);\n          }\n        }\n      });\n    }, null, true);\n    return {rootProps: rootProps, hostProps: hostProps};\n  }\n\n  /**\n   * @param {Element} element\n   * @param {Object} properties\n   * @param {string} scopeSelector\n   */\n  transformStyles(element, properties, scopeSelector) {\n    let self = this;\n    let {is, typeExtension} = StyleUtil.getIsExtends(element);\n    let hostSelector = StyleTransformer\n      ._calcHostScope(is, typeExtension);\n    let rxHostSelector = element.extends ?\n      '\\\\' + hostSelector.slice(0, -1) + '\\\\]' :\n      hostSelector;\n    let hostRx = new RegExp(RX.HOST_PREFIX + rxHostSelector +\n      RX.HOST_SUFFIX);\n    let rules = StyleInfo.get(element).styleRules;\n    let keyframeTransforms =\n      this._elementKeyframeTransforms(element, rules, scopeSelector);\n    return StyleTransformer.elementStyles(element, rules, function(rule) {\n      self.applyProperties(rule, properties);\n      if (!nativeShadow &&\n          !StyleUtil.isKeyframesSelector(rule) &&\n          rule['cssText']) {\n        // NOTE: keyframe transforms only scope munge animation names, so it\n        // is not necessary to apply them in ShadowDOM.\n        self.applyKeyframeTransforms(rule, keyframeTransforms);\n        self._scopeSelector(rule, hostRx, hostSelector, scopeSelector);\n      }\n    });\n  }\n\n  /**\n   * @param {Element} element\n   * @param {StyleNode} rules\n   * @param {string} scopeSelector\n   * @return {Object}\n   */\n  _elementKeyframeTransforms(element, rules, scopeSelector) {\n    let keyframesRules = rules._keyframes;\n    let keyframeTransforms = {};\n    if (!nativeShadow && keyframesRules) {\n      // For non-ShadowDOM, we transform all known keyframes rules in\n      // advance for the current scope. This allows us to catch keyframes\n      // rules that appear anywhere in the stylesheet:\n      for (let i = 0, keyframesRule = keyframesRules[i];\n           i < keyframesRules.length;\n           keyframesRule = keyframesRules[++i]) {\n        this._scopeKeyframes(keyframesRule, scopeSelector);\n        keyframeTransforms[keyframesRule['keyframesName']] =\n            this._keyframesRuleTransformer(keyframesRule);\n      }\n    }\n    return keyframeTransforms;\n  }\n\n  // Generate a factory for transforming a chunk of CSS text to handle a\n  // particular scoped keyframes rule.\n  /**\n   * @param {StyleNode} keyframesRule\n   * @return {function(string):string}\n   */\n  _keyframesRuleTransformer(keyframesRule) {\n    return function(cssText) {\n      return cssText.replace(\n          keyframesRule.keyframesNameRx,\n          keyframesRule.transformedKeyframesName);\n    };\n  }\n\n/**\n * Transforms `@keyframes` names to be unique for the current host.\n * Example: @keyframes foo-anim -> @keyframes foo-anim-x-foo-0\n *\n * @param {StyleNode} rule\n * @param {string} scopeId\n */\n  _scopeKeyframes(rule, scopeId) {\n    rule.keyframesNameRx = new RegExp(rule['keyframesName'], 'g');\n    rule.transformedKeyframesName = rule['keyframesName'] + '-' + scopeId;\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    rule['selector'] = rule.transformedSelector.replace(\n        rule['keyframesName'], rule.transformedKeyframesName);\n  }\n\n  // Strategy: x scope shim a selector e.g. to scope `.x-foo-42` (via classes):\n  // non-host selector: .a.x-foo -> .x-foo-42 .a.x-foo\n  // host selector: x-foo.wide -> .x-foo-42.wide\n  // note: we use only the scope class (.x-foo-42) and not the hostSelector\n  // (x-foo) to scope :host rules; this helps make property host rules\n  // have low specificity. They are overrideable by class selectors but,\n  // unfortunately, not by type selectors (e.g. overriding via\n  // `.special` is ok, but not by `x-foo`).\n  /**\n   * @param {StyleNode} rule\n   * @param {RegExp} hostRx\n   * @param {string} hostSelector\n   * @param {string} scopeId\n   */\n  _scopeSelector(rule, hostRx, hostSelector, scopeId) {\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    let selector = rule.transformedSelector;\n    let scope = '.' + scopeId;\n    let parts = selector.split(',');\n    for (let i=0, l=parts.length, p; (i<l) && (p=parts[i]); i++) {\n      parts[i] = p.match(hostRx) ?\n        p.replace(hostSelector, scope) :\n        scope + ' ' + p;\n    }\n    rule['selector'] = parts.join(',');\n  }\n\n  /**\n   * @param {Element} element\n   * @param {string} selector\n   * @param {string} old\n   */\n  applyElementScopeSelector(element, selector, old) {\n    let c = element.getAttribute('class') || '';\n    let v = c;\n    if (old) {\n      v = c.replace(\n        new RegExp('\\\\s*' + XSCOPE_NAME + '\\\\s*' + old + '\\\\s*', 'g'), ' ');\n    }\n    v += (v ? ' ' : '') + XSCOPE_NAME + ' ' + selector;\n    if (c !== v) {\n      StyleUtil.setElementClassRaw(element, v);\n    }\n  }\n\n  /**\n   * @param {HTMLElement} element\n   * @param {Object} properties\n   * @param {string} selector\n   * @param {HTMLStyleElement} style\n   * @return {HTMLStyleElement}\n   */\n  applyElementStyle(element, properties, selector, style) {\n    // calculate cssText to apply\n    let cssText = style ? style.textContent || '' :\n      this.transformStyles(element, properties, selector);\n    // if shady and we have a cached style that is not style, decrement\n    let styleInfo = StyleInfo.get(element);\n    let s = styleInfo.customStyle;\n    if (s && !nativeShadow && (s !== style)) {\n      s['_useCount']--;\n      if (s['_useCount'] <= 0 && s.parentNode) {\n        s.parentNode.removeChild(s);\n      }\n    }\n    // apply styling always under native or if we generated style\n    // or the cached style is not in document(!)\n    if (nativeShadow) {\n      // update existing style only under native\n      if (styleInfo.customStyle) {\n        styleInfo.customStyle.textContent = cssText;\n        style = styleInfo.customStyle;\n      // otherwise, if we have css to apply, do so\n      } else if (cssText) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        style = StyleUtil.applyCss(cssText, selector, element.shadowRoot,\n          styleInfo.placeholder);\n      }\n    } else {\n      // shady and no cache hit\n      if (!style) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        if (cssText) {\n          style = StyleUtil.applyCss(cssText, selector, null,\n            styleInfo.placeholder);\n        }\n      // shady and cache hit but not in document\n      } else if (!style.parentNode) {\n        if (IS_IE && cssText.indexOf('@media') > -1) {\n            // @media rules may be stale in IE 10 and 11\n            // refresh the text content of the style to revalidate them.\n          style.textContent = cssText;\n        }\n        StyleUtil.applyStyle(style, null, styleInfo.placeholder);\n      }\n    }\n    // ensure this style is our custom style and increment its use count.\n    if (style) {\n      style['_useCount'] = style['_useCount'] || 0;\n      // increment use count if we changed styles\n      if (styleInfo.customStyle != style) {\n        style['_useCount']++;\n      }\n      styleInfo.customStyle = style;\n    }\n    return style;\n  }\n\n  /**\n   * @param {Element} style\n   * @param {Object} properties\n   */\n  applyCustomStyle(style, properties) {\n    let rules = StyleUtil.rulesForStyle(/** @type {HTMLStyleElement} */(style));\n    let self = this;\n    style.textContent = StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      let css = rule['cssText'] = rule['parsedCssText'];\n      if (rule.propertyInfo && rule.propertyInfo.cssText) {\n        // remove property assignments\n        // so next function isn't confused\n        // NOTE: we have 3 categories of css:\n        // (1) normal properties,\n        // (2) custom property assignments (--foo: red;),\n        // (3) custom property usage: border: var(--foo); @apply(--foo);\n        // In elements, 1 and 3 are separated for efficiency; here they\n        // are not and this makes this case unique.\n        css = removeCustomPropAssignment(/** @type {string} */(css));\n        // replace with reified properties, scenario is same as mixin\n        rule['cssText'] = self.valueForProperties(css, properties);\n      }\n    });\n  }\n}\n\n/**\n * @param {number} n\n * @param {Array<number>} bits\n */\nfunction addToBitMask(n, bits) {\n  let o = parseInt(n / 32, 10);\n  let v = 1 << (n % 32);\n  bits[o] = (bits[o] || 0) | v;\n}\n\nexport default new StyleProperties();","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {applyStylePlaceHolder} from './style-util.js'\nimport {nativeShadow} from './style-settings.js'\n\n/** @type {Object<string, !Node>} */\nlet placeholderMap = {};\n\n/**\n * @const {CustomElementRegistry}\n */\nconst ce = window['customElements'];\nif (ce && !nativeShadow) {\n  /**\n   * @const {function(this:CustomElementRegistry, string,function(new:HTMLElement),{extends: string}=)}\n   */\n  const origDefine = ce['define'];\n  /**\n   * @param {string} name\n   * @param {function(new:HTMLElement)} clazz\n   * @param {{extends: string}=} options\n   * @return {function(new:HTMLElement)}\n   */\n  const wrappedDefine = (name, clazz, options) => {\n    placeholderMap[name] = applyStylePlaceHolder(name);\n    return origDefine.call(/** @type {!CustomElementRegistry} */(ce), name, clazz, options);\n  }\n  ce['define'] = wrappedDefine;\n}\n\nexport default placeholderMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n'use strict';\n\nexport default class StyleCache {\n  constructor(typeMax = 100) {\n    // map element name -> [{properties, styleElement, scopeSelector}]\n    this.cache = {};\n    this.typeMax = typeMax;\n  }\n\n  _validate(cacheEntry, properties, ownPropertyNames) {\n    for (let idx = 0; idx < ownPropertyNames.length; idx++) {\n      let pn = ownPropertyNames[idx];\n      if (cacheEntry.properties[pn] !== properties[pn]) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  store(tagname, properties, styleElement, scopeSelector) {\n    let list = this.cache[tagname] || [];\n    list.push({properties, styleElement, scopeSelector});\n    if (list.length > this.typeMax) {\n      list.shift();\n    }\n    this.cache[tagname] = list;\n  }\n\n  fetch(tagname, properties, ownPropertyNames) {\n    let list = this.cache[tagname];\n    if (!list) {\n      return;\n    }\n    // reverse list for most-recent lookups\n    for (let idx = list.length - 1; idx >= 0; idx--) {\n      let entry = list[idx];\n      if (this._validate(entry, properties, ownPropertyNames)) {\n        return entry;\n      }\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport {getIsExtends} from './style-util.js'\n\nexport let flush = function() {};\n\n/**\n * @param {HTMLElement} element\n * @return {!Array<string>}\n */\nfunction getClasses(element) {\n  let classes = [];\n  if (element.classList) {\n    classes = Array.from(element.classList);\n  } else if (element instanceof window['SVGElement'] && element.hasAttribute('class')) {\n    classes = element.getAttribute('class').split(/\\s+/);\n  }\n  return classes;\n}\n\n/**\n * @param {HTMLElement} element\n * @return {string}\n */\nfunction getCurrentScope(element) {\n  let classes = getClasses(element);\n  let idx = classes.indexOf(StyleTransformer.SCOPE_NAME);\n  if (idx > -1) {\n    return classes[idx + 1];\n  }\n  return '';\n}\n\n/**\n * @param {Array<MutationRecord|null>|null} mxns\n */\nfunction handler(mxns) {\n  for (let x=0; x < mxns.length; x++) {\n    let mxn = mxns[x];\n    if (mxn.target === document.documentElement ||\n      mxn.target === document.head) {\n      continue;\n    }\n    for (let i=0; i < mxn.addedNodes.length; i++) {\n      let n = mxn.addedNodes[i];\n      if (n.nodeType !== Node.ELEMENT_NODE) {\n        continue;\n      }\n      n = /** @type {HTMLElement} */(n); // eslint-disable-line no-self-assign\n      let root = n.getRootNode();\n      let currentScope = getCurrentScope(n);\n      // node was scoped, but now is in document\n      if (currentScope && root === n.ownerDocument) {\n        StyleTransformer.dom(n, currentScope, true);\n      } else if (root.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n        let newScope;\n        let host = /** @type {ShadowRoot} */(root).host;\n        // element may no longer be in a shadowroot\n        if (!host) {\n          continue;\n        }\n        newScope = getIsExtends(host).is;\n        if (currentScope === newScope) {\n          continue;\n        }\n        if (currentScope) {\n          StyleTransformer.dom(n, currentScope, true);\n        }\n        StyleTransformer.dom(n, newScope);\n      }\n    }\n  }\n}\n\nif (!nativeShadow) {\n  let observer = new MutationObserver(handler);\n  let start = (node) => {\n    observer.observe(node, {childList: true, subtree: true});\n  }\n  let nativeCustomElements = (window['customElements'] &&\n    !window['customElements']['polyfillWrapFlushCallback']);\n  // need to start immediately with native custom elements\n  // TODO(dfreedm): with polyfilled HTMLImports and native custom elements\n  // excessive mutations may be observed; this can be optimized via cooperation\n  // with the HTMLImports polyfill.\n  if (nativeCustomElements) {\n    start(document);\n  } else {\n    let delayedStart = () => {\n      start(document.body);\n    }\n    // use polyfill timing if it's available\n    if (window['HTMLImports']) {\n      window['HTMLImports']['whenReady'](delayedStart);\n    // otherwise push beyond native imports being ready\n    // which requires RAF + readystate interactive.\n    } else {\n      requestAnimationFrame(function() {\n        if (document.readyState === 'loading') {\n          let listener = function() {\n            delayedStart();\n            document.removeEventListener('readystatechange', listener);\n          }\n          document.addEventListener('readystatechange', listener);\n        } else {\n          delayedStart();\n        }\n      });\n    }\n  }\n\n  flush = function() {\n    handler(observer.takeRecords());\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/**\n * @const {!Object<string, !HTMLTemplateElement>}\n */\nconst templateMap = {};\nexport default templateMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\nimport templateMap from './template-map.js'\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\n\n/*\n * Utilities for handling invalidating apply-shim mixins for a given template.\n *\n * The invalidation strategy involves keeping track of the \"current\" version of a template's mixins, and updating that count when a mixin is invalidated.\n * The template\n */\n\n/** @const {string} */\nconst CURRENT_VERSION = '_applyShimCurrentVersion';\n\n/** @const {string} */\nconst NEXT_VERSION = '_applyShimNextVersion';\n\n/** @const {string} */\nconst VALIDATING_VERSION = '_applyShimValidatingVersion';\n\n/**\n * @const {Promise<void>}\n */\nconst promise = Promise.resolve();\n\n/**\n * @param {string} elementName\n */\nexport function invalidate(elementName){\n  let template = templateMap[elementName];\n  if (template) {\n    invalidateTemplate(template);\n  }\n}\n\n/**\n * This function can be called multiple times to mark a template invalid\n * and signal that the style inside must be regenerated.\n *\n * Use `startValidatingTemplate` to begin an asynchronous validation cycle.\n * During that cycle, call `templateIsValidating` to see if the template must\n * be revalidated\n * @param {HTMLTemplateElement} template\n */\nexport function invalidateTemplate(template) {\n  // default the current version to 0\n  template[CURRENT_VERSION] = template[CURRENT_VERSION] || 0;\n  // ensure the \"validating for\" flag exists\n  template[VALIDATING_VERSION] = template[VALIDATING_VERSION] || 0;\n  // increment the next version\n  template[NEXT_VERSION] = (template[NEXT_VERSION] || 0) + 1;\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValid(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValid(template);\n  }\n  return true;\n}\n\n/**\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValid(template) {\n  return template[CURRENT_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValidating(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValidating(template);\n  }\n  return false;\n}\n\n/**\n * Returns true if the template is currently invalid and `startValidating` has been called since the last invalidation.\n * If false, the template must be validated.\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValidating(template) {\n  return !templateIsValid(template) && template[VALIDATING_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * the template is marked as `validating` for one microtask so that all instances\n * found in the tree crawl of `applyStyle` will update themselves,\n * but the template will only be updated once.\n * @param {string} elementName\n*/\nexport function startValidating(elementName) {\n  let template = templateMap[elementName];\n  startValidatingTemplate(template);\n}\n\n/**\n * Begin an asynchronous invalidation cycle.\n * This should be called after every validation of a template\n *\n * After one microtask, the template will be marked as valid until the next call to `invalidateTemplate`\n * @param {HTMLTemplateElement} template\n */\nexport function startValidatingTemplate(template) {\n  // remember that the current \"next version\" is the reason for this validation cycle\n  template[VALIDATING_VERSION] = template[NEXT_VERSION];\n  // however, there only needs to be one async task to clear the counters\n  if (!template._validating) {\n    template._validating = true;\n    promise.then(function() {\n      // sync the current version to let future invalidations cause a refresh cycle\n      template[CURRENT_VERSION] = template[NEXT_VERSION];\n      template._validating = false;\n    });\n  }\n}\n\n/**\n * @return {boolean}\n */\nexport function elementsAreInvalid() {\n  for (let elementName in templateMap) {\n    let template = templateMap[elementName];\n    if (!templateIsValid(template)) {\n      return true;\n    }\n  }\n  return false;\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {Promise<void>} */\nlet readyPromise = null;\n\n/** @type {?function(?function())} */\nlet whenReady = window['HTMLImports'] && window['HTMLImports']['whenReady'] || null;\n\n/** @type {function()} */\nlet resolveFn;\n\n/**\n * @param {?function()} callback\n */\nexport default function documentWait(callback) {\n  requestAnimationFrame(function() {\n    if (whenReady) {\n      whenReady(callback)\n    } else {\n      if (!readyPromise) {\n        readyPromise = new Promise((resolve) => {resolveFn = resolve});\n        if (document.readyState === 'complete') {\n          resolveFn();\n        } else {\n          document.addEventListener('readystatechange', () => {\n            if (document.readyState === 'complete') {\n              resolveFn();\n            }\n          });\n        }\n      }\n      readyPromise.then(function(){ callback && callback(); });\n    }\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js'\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n  // remove previous properties\n  for (let p in properties) {\n    // NOTE: for bc with shim, don't apply null values.\n    if (p === null) {\n      element.style.removeProperty(p);\n    } else {\n      element.style.setProperty(p, properties[p]);\n    }\n  }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n  /**\n   * @const {string}\n   */\n  const value = window.getComputedStyle(element).getPropertyValue(property);\n  if (!value) {\n    return '';\n  } else {\n    return value.trim();\n  }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n  const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n  // reset state of the regexes\n  MIXIN_MATCH.lastIndex = 0;\n  VAR_ASSIGN.lastIndex = 0;\n  return has;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport documentWait from './document-wait.js'\n\n/**\n * @typedef {HTMLStyleElement | {getStyle: function():HTMLStyleElement}}\n */\nexport let CustomStyleProvider;\n\nconst SEEN_MARKER = '__seenByShadyCSS';\nconst CACHED_STYLE = '__shadyCSSCachedStyle';\n\n/** @type {?function(!HTMLStyleElement)} */\nlet transformFn = null;\n\n/** @type {?function()} */\nlet validateFn = null;\n\n/**\nThis interface is provided to add document-level <style> elements to ShadyCSS for processing.\nThese styles must be processed by ShadyCSS to simulate ShadowRoot upper-bound encapsulation from outside styles\nIn addition, these styles may also need to be processed for @apply rules and CSS Custom Properties\n\nTo add document-level styles to ShadyCSS, one can call `ShadyCSS.addDocumentStyle(styleElement)` or `ShadyCSS.addDocumentStyle({getStyle: () => styleElement})`\n\nIn addition, if the process used to discover document-level styles can be synchronously flushed, one should set `ShadyCSS.documentStyleFlush`.\nThis function will be called when calculating styles.\n\nAn example usage of the document-level styling api can be found in `examples/document-style-lib.js`\n\n@unrestricted\n*/\nexport default class CustomStyleInterface {\n  constructor() {\n    /** @type {!Array<!CustomStyleProvider>} */\n    this['customStyles'] = [];\n    this['enqueued'] = false;\n  }\n  /**\n   * Queue a validation for new custom styles to batch style recalculations\n   */\n  enqueueDocumentValidation() {\n    if (this['enqueued'] || !validateFn) {\n      return;\n    }\n    this['enqueued'] = true;\n    documentWait(validateFn);\n  }\n  /**\n   * @param {!HTMLStyleElement} style\n   */\n  addCustomStyle(style) {\n    if (!style[SEEN_MARKER]) {\n      style[SEEN_MARKER] = true;\n      this['customStyles'].push(style);\n      this.enqueueDocumentValidation();\n    }\n  }\n  /**\n   * @param {!CustomStyleProvider} customStyle\n   * @return {HTMLStyleElement}\n   */\n  getStyleForCustomStyle(customStyle) {\n    if (customStyle[CACHED_STYLE]) {\n      return customStyle[CACHED_STYLE];\n    }\n    let style;\n    if (customStyle['getStyle']) {\n      style = customStyle['getStyle']();\n    } else {\n      style = customStyle;\n    }\n    return style;\n  }\n  /**\n   * @return {!Array<!CustomStyleProvider>}\n   */\n  processStyles() {\n    const cs = this['customStyles'];\n    for (let i = 0; i < cs.length; i++) {\n      const customStyle = cs[i];\n      if (customStyle[CACHED_STYLE]) {\n        continue;\n      }\n      const style = this.getStyleForCustomStyle(customStyle);\n      if (style) {\n        // HTMLImports polyfill may have cloned the style into the main document,\n        // which is referenced with __appliedElement.\n        const styleToTransform = /** @type {!HTMLStyleElement} */(style['__appliedElement'] || style);\n        if (transformFn) {\n          transformFn(styleToTransform);\n        }\n        customStyle[CACHED_STYLE] = styleToTransform;\n      }\n    }\n    return cs;\n  }\n}\n\nCustomStyleInterface.prototype['addCustomStyle'] = CustomStyleInterface.prototype.addCustomStyle;\nCustomStyleInterface.prototype['getStyleForCustomStyle'] = CustomStyleInterface.prototype.getStyleForCustomStyle;\nCustomStyleInterface.prototype['processStyles'] = CustomStyleInterface.prototype.processStyles;\n\nObject.defineProperties(CustomStyleInterface.prototype, {\n  'transformCallback': {\n    /** @return {?function(!HTMLStyleElement)} */\n    get() {\n      return transformFn;\n    },\n    /** @param {?function(!HTMLStyleElement)} fn */\n    set(fn) {\n      transformFn = fn;\n    }\n  },\n  'validateCallback': {\n    /** @return {?function()} */\n    get() {\n      return validateFn;\n    },\n    /**\n     * @param {?function()} fn\n     * @this {CustomStyleInterface}\n     */\n    set(fn) {\n      let needsEnqueue = false;\n      if (!validateFn) {\n        needsEnqueue = true;\n      }\n      validateFn = fn;\n      if (needsEnqueue) {\n        this.enqueueDocumentValidation();\n      }\n    },\n  }\n})\n\n/** @typedef {{\n * customStyles: !Array<!CustomStyleProvider>,\n * addCustomStyle: function(!CustomStyleProvider),\n * getStyleForCustomStyle: function(!CustomStyleProvider): HTMLStyleElement,\n * findStyles: function(),\n * transformCallback: ?function(!HTMLStyleElement),\n * validateCallback: ?function()\n * }}\n */\nexport let CustomStyleInterfaceInterface;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {parse, StyleNode} from './css-parse.js'\nimport {nativeShadow, nativeCssVariables} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport * as StyleUtil from './style-util.js'\nimport StyleProperties from './style-properties.js'\nimport placeholderMap from './style-placeholder.js'\nimport StyleInfo from './style-info.js'\nimport StyleCache from './style-cache.js'\nimport {flush as watcherFlush} from './document-watcher.js'\nimport templateMap from './template-map.js'\nimport * as ApplyShimUtils from './apply-shim-utils.js'\nimport documentWait from './document-wait.js'\nimport {updateNativeProperties, detectMixin} from './common-utils.js'\nimport {CustomStyleInterfaceInterface} from './custom-style-interface.js' //eslint-disable-line no-unused-vars\n\n/**\n * @const {StyleCache}\n */\nconst styleCache = new StyleCache();\n\nexport default class ScopingShim {\n  constructor() {\n    this._scopeCounter = {};\n    this._documentOwner = document.documentElement;\n    let ast = new StyleNode();\n    ast['rules'] = [];\n    this._documentOwnerStyleInfo = StyleInfo.set(this._documentOwner, new StyleInfo(ast));\n    this._elementsHaveApplied = false;\n    this._applyShim = null;\n    /** @type {?CustomStyleInterfaceInterface} */\n    this._customStyleInterface = null;\n    documentWait(() => {\n      this._ensure();\n    });\n  }\n  flush() {\n    watcherFlush();\n  }\n  _generateScopeSelector(name) {\n    let id = this._scopeCounter[name] = (this._scopeCounter[name] || 0) + 1;\n    return `${name}-${id}`;\n  }\n  getStyleAst(style) {\n    return StyleUtil.rulesForStyle(style);\n  }\n  styleAstToString(ast) {\n    return StyleUtil.toCssText(ast);\n  }\n  _gatherStyles(template) {\n    let styles = template.content.querySelectorAll('style');\n    let cssText = [];\n    for (let i = 0; i < styles.length; i++) {\n      let s = styles[i];\n      cssText.push(s.textContent);\n      s.parentNode.removeChild(s);\n    }\n    return cssText.join('').trim();\n  }\n  _getCssBuild(template) {\n    let style = template.content.querySelector('style');\n    if (!style) {\n      return '';\n    }\n    return style.getAttribute('css-build') || '';\n  }\n  /**\n   * Prepare the styling and template for the given element type\n   *\n   * @param {HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} typeExtension\n   */\n  prepareTemplate(template, elementName, typeExtension) {\n    if (template._prepared) {\n      return;\n    }\n    template._prepared = true;\n    template.name = elementName;\n    template.extends = typeExtension;\n    templateMap[elementName] = template;\n    let cssBuild = this._getCssBuild(template);\n    let cssText = this._gatherStyles(template);\n    let info = {\n      is: elementName,\n      extends: typeExtension,\n      __cssBuild: cssBuild,\n    };\n    if (!nativeShadow) {\n      StyleTransformer.dom(template.content, elementName);\n    }\n    // check if the styling has mixin definitions or uses\n    this._ensure();\n    let hasMixins = detectMixin(cssText)\n    let ast = parse(cssText);\n    // only run the applyshim transforms if there is a mixin involved\n    if (hasMixins && nativeCssVariables && this._applyShim) {\n      this._applyShim['transformRules'](ast, elementName);\n    }\n    template['_styleAst'] = ast;\n    template._cssBuild = cssBuild;\n\n    let ownPropertyNames = [];\n    if (!nativeCssVariables) {\n      ownPropertyNames = StyleProperties.decorateStyles(template['_styleAst'], info);\n    }\n    if (!ownPropertyNames.length || nativeCssVariables) {\n      let root = nativeShadow ? template.content : null;\n      let placeholder = placeholderMap[elementName];\n      let style = this._generateStaticStyle(info, template['_styleAst'], root, placeholder);\n      template._style = style;\n    }\n    template._ownPropertyNames = ownPropertyNames;\n  }\n  _generateStaticStyle(info, rules, shadowroot, placeholder) {\n    let cssText = StyleTransformer.elementStyles(info, rules);\n    if (cssText.length) {\n      return StyleUtil.applyCss(cssText, info.is, shadowroot, placeholder);\n    }\n  }\n  _prepareHost(host) {\n    let {is, typeExtension} = StyleUtil.getIsExtends(host);\n    let placeholder = placeholderMap[is];\n    let template = templateMap[is];\n    let ast;\n    let ownStylePropertyNames;\n    let cssBuild;\n    if (template) {\n      ast = template['_styleAst'];\n      ownStylePropertyNames = template._ownPropertyNames;\n      cssBuild = template._cssBuild;\n    }\n    return StyleInfo.set(host,\n      new StyleInfo(\n        ast,\n        placeholder,\n        ownStylePropertyNames,\n        is,\n        typeExtension,\n        cssBuild\n      )\n    );\n  }\n  _ensureApplyShim() {\n    if (this._applyShim) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.ApplyShim) {\n      this._applyShim = window.ShadyCSS.ApplyShim;\n      this._applyShim['invalidCallback'] = ApplyShimUtils.invalidate;\n    }\n  }\n  _ensureCustomStyleInterface() {\n    if (this._customStyleInterface) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.CustomStyleInterface) {\n      this._customStyleInterface = /** @type {!CustomStyleInterfaceInterface} */(window.ShadyCSS.CustomStyleInterface);\n      /** @type {function(!HTMLStyleElement)} */\n      this._customStyleInterface['transformCallback'] = (style) => {this.transformCustomStyleForDocument(style)};\n      this._customStyleInterface['validateCallback'] = () => {\n        requestAnimationFrame(() => {\n          if (this._customStyleInterface['enqueued'] || this._elementsHaveApplied) {\n            this.flushCustomStyles();\n          }\n        })\n      };\n    }\n  }\n  _ensure() {\n    this._ensureApplyShim();\n    this._ensureCustomStyleInterface();\n  }\n  /**\n   * Flush and apply custom styles to document\n   */\n  flushCustomStyles() {\n    this._ensure();\n    if (!this._customStyleInterface) {\n      return;\n    }\n    let customStyles = this._customStyleInterface['processStyles']();\n    // early return if custom-styles don't need validation\n    if (!this._customStyleInterface['enqueued']) {\n      return;\n    }\n    if (!nativeCssVariables) {\n      this._updateProperties(this._documentOwner, this._documentOwnerStyleInfo);\n      this._applyCustomStyles(customStyles);\n    } else {\n      this._revalidateCustomStyleApplyShim(customStyles);\n    }\n    this._customStyleInterface['enqueued'] = false;\n    // if custom elements have upgraded and there are no native css variables, we must recalculate the whole tree\n    if (this._elementsHaveApplied && !nativeCssVariables) {\n      this.styleDocument();\n    }\n  }\n  /**\n   * Apply styles for the given element\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} overrideProps\n   */\n  styleElement(host, overrideProps) {\n    let {is} = StyleUtil.getIsExtends(host);\n    let styleInfo = StyleInfo.get(host);\n    if (!styleInfo) {\n      styleInfo = this._prepareHost(host);\n    }\n    // Only trip the `elementsHaveApplied` flag if a node other that the root document has `applyStyle` called\n    if (!this._isRootOwner(host)) {\n      this._elementsHaveApplied = true;\n    }\n    if (overrideProps) {\n      styleInfo.overrideStyleProperties =\n        styleInfo.overrideStyleProperties || {};\n      Object.assign(styleInfo.overrideStyleProperties, overrideProps);\n    }\n    if (!nativeCssVariables) {\n     this._updateProperties(host, styleInfo);\n      if (styleInfo.ownStylePropertyNames && styleInfo.ownStylePropertyNames.length) {\n        this._applyStyleProperties(host, styleInfo);\n      }\n    } else {\n      if (styleInfo.overrideStyleProperties) {\n        updateNativeProperties(host, styleInfo.overrideStyleProperties);\n      }\n      let template = templateMap[is];\n      // bail early if there is no shadowroot for this element\n      if (!template && !this._isRootOwner(host)) {\n        return;\n      }\n      if (template && template._style && !ApplyShimUtils.templateIsValid(template)) {\n        // update template\n        if (!ApplyShimUtils.templateIsValidating(template)) {\n          this._ensure();\n          this._applyShim && this._applyShim['transformRules'](template['_styleAst'], is);\n          template._style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          ApplyShimUtils.startValidatingTemplate(template);\n        }\n        // update instance if native shadowdom\n        if (nativeShadow) {\n          let root = host.shadowRoot;\n          if (root) {\n            let style = root.querySelector('style');\n            style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          }\n        }\n        styleInfo.styleRules = template['_styleAst'];\n      }\n    }\n  }\n  _styleOwnerForNode(node) {\n    let root = node.getRootNode();\n    let host = root.host;\n    if (host) {\n      if (StyleInfo.get(host)) {\n        return host;\n      } else {\n        return this._styleOwnerForNode(host);\n      }\n    }\n    return this._documentOwner;\n  }\n  _isRootOwner(node) {\n    return (node === this._documentOwner);\n  }\n  _applyStyleProperties(host, styleInfo) {\n    let is = StyleUtil.getIsExtends(host).is;\n    let cacheEntry = styleCache.fetch(is, styleInfo.styleProperties, styleInfo.ownStylePropertyNames);\n    let cachedScopeSelector = cacheEntry && cacheEntry.scopeSelector;\n    let cachedStyle = cacheEntry ? cacheEntry.styleElement : null;\n    let oldScopeSelector = styleInfo.scopeSelector;\n    // only generate new scope if cached style is not found\n    styleInfo.scopeSelector = cachedScopeSelector || this._generateScopeSelector(is);\n    let style = StyleProperties.applyElementStyle(host, styleInfo.styleProperties, styleInfo.scopeSelector, cachedStyle);\n    if (!nativeShadow) {\n      StyleProperties.applyElementScopeSelector(host, styleInfo.scopeSelector, oldScopeSelector);\n    }\n    if (!cacheEntry) {\n      styleCache.store(is, styleInfo.styleProperties, style, styleInfo.scopeSelector);\n    }\n    return style;\n  }\n  _updateProperties(host, styleInfo) {\n    let owner = this._styleOwnerForNode(host);\n    let ownerStyleInfo = StyleInfo.get(owner);\n    let ownerProperties = ownerStyleInfo.styleProperties;\n    let props = Object.create(ownerProperties || null);\n    let hostAndRootProps = StyleProperties.hostAndRootPropertiesForScope(host, styleInfo.styleRules);\n    let propertyData = StyleProperties.propertyDataFromStyles(ownerStyleInfo.styleRules, host);\n    let propertiesMatchingHost = propertyData.properties\n    Object.assign(\n      props,\n      hostAndRootProps.hostProps,\n      propertiesMatchingHost,\n      hostAndRootProps.rootProps\n    );\n    this._mixinOverrideStyles(props, styleInfo.overrideStyleProperties);\n    StyleProperties.reify(props);\n    styleInfo.styleProperties = props;\n  }\n  _mixinOverrideStyles(props, overrides) {\n    for (let p in overrides) {\n      let v = overrides[p];\n      // skip override props if they are not truthy or 0\n      // in order to fall back to inherited values\n      if (v || v === 0) {\n        props[p] = v;\n      }\n    }\n  }\n  /**\n   * Update styles of the whole document\n   *\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    this.styleSubtree(this._documentOwner, properties);\n  }\n  /**\n   * Update styles of a subtree\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} properties\n   */\n  styleSubtree(host, properties) {\n    let root = host.shadowRoot;\n    if (root || this._isRootOwner(host)) {\n      this.styleElement(host, properties);\n    }\n    // process the shadowdom children of `host`\n    let shadowChildren = root && (root.children || root.childNodes);\n    if (shadowChildren) {\n      for (let i = 0; i < shadowChildren.length; i++) {\n        let c = /** @type {!HTMLElement} */(shadowChildren[i]);\n        this.styleSubtree(c);\n      }\n    } else {\n      // process the lightdom children of `host`\n      let children = host.children || host.childNodes;\n      if (children) {\n        for (let i = 0; i < children.length; i++) {\n          let c = /** @type {!HTMLElement} */(children[i]);\n          this.styleSubtree(c);\n        }\n      }\n    }\n  }\n  /* Custom Style operations */\n  _revalidateCustomStyleApplyShim(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        this._revalidateApplyShim(s);\n      }\n    }\n  }\n  _applyCustomStyles(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        StyleProperties.applyCustomStyle(s, this._documentOwnerStyleInfo.styleProperties);\n      }\n    }\n  }\n  transformCustomStyleForDocument(style) {\n    let ast = StyleUtil.rulesForStyle(style);\n    StyleUtil.forEachRule(ast, (rule) => {\n      if (nativeShadow) {\n        StyleTransformer.normalizeRootSelector(rule);\n      } else {\n        StyleTransformer.documentRule(rule);\n      }\n      if (nativeCssVariables) {\n        this._ensure();\n        this._applyShim && this._applyShim['transformRule'](rule);\n      }\n    });\n    if (nativeCssVariables) {\n      style.textContent = StyleUtil.toCssText(ast);\n    } else {\n      this._documentOwnerStyleInfo.styleRules.rules.push(ast);\n    }\n  }\n  _revalidateApplyShim(style) {\n    if (nativeCssVariables && this._applyShim) {\n      let ast = StyleUtil.rulesForStyle(style);\n      this._ensure();\n      this._applyShim['transformRules'](ast);\n      style.textContent = StyleUtil.toCssText(ast);\n    }\n  }\n  getComputedStyleValue(element, property) {\n    let value;\n    if (!nativeCssVariables) {\n      // element is either a style host, or an ancestor of a style host\n      let styleInfo = StyleInfo.get(element) || StyleInfo.get(this._styleOwnerForNode(element));\n      value = styleInfo.styleProperties[property];\n    }\n    // fall back to the property value from the computed styling\n    value = value || window.getComputedStyle(element).getPropertyValue(property);\n    // trim whitespace that can come after the `:` in css\n    // example: padding: 2px -> \" 2px\"\n    return value ? value.trim() : '';\n  }\n  // given an element and a classString, replaces\n  // the element's class with the provided classString and adds\n  // any necessary ShadyCSS static and property based scoping selectors\n  setElementClass(element, classString) {\n    let root = element.getRootNode();\n    let classes = classString ? classString.split(/\\s/) : [];\n    let scopeName = root.host && root.host.localName;\n    // If no scope, try to discover scope name from existing class.\n    // This can occur if, for example, a template stamped element that\n    // has been scoped is manipulated when not in a root.\n    if (!scopeName) {\n      var classAttr = element.getAttribute('class');\n      if (classAttr) {\n        let k$ = classAttr.split(/\\s/);\n        for (let i=0; i < k$.length; i++) {\n          if (k$[i] === StyleTransformer.SCOPE_NAME) {\n            scopeName = k$[i+1];\n            break;\n          }\n        }\n      }\n    }\n    if (scopeName) {\n      classes.push(StyleTransformer.SCOPE_NAME, scopeName);\n    }\n    if (!nativeCssVariables) {\n      let styleInfo = StyleInfo.get(element);\n      if (styleInfo && styleInfo.scopeSelector) {\n        classes.push(StyleProperties.XSCOPE_NAME, styleInfo.scopeSelector);\n      }\n    }\n    StyleUtil.setElementClassRaw(element, classes.join(' '));\n  }\n  _styleInfoForNode(node) {\n    return StyleInfo.get(node);\n  }\n}\n\n/* exports */\nScopingShim.prototype['flush'] = ScopingShim.prototype.flush;\nScopingShim.prototype['prepareTemplate'] = ScopingShim.prototype.prepareTemplate;\nScopingShim.prototype['styleElement'] = ScopingShim.prototype.styleElement;\nScopingShim.prototype['styleDocument'] = ScopingShim.prototype.styleDocument;\nScopingShim.prototype['styleSubtree'] = ScopingShim.prototype.styleSubtree;\nScopingShim.prototype['getComputedStyleValue'] = ScopingShim.prototype.getComputedStyleValue;\nScopingShim.prototype['setElementClass'] = ScopingShim.prototype.setElementClass;\nScopingShim.prototype['_styleInfoForNode'] = ScopingShim.prototype._styleInfoForNode;\nScopingShim.prototype['transformCustomStyleForDocument'] = ScopingShim.prototype.transformCustomStyleForDocument;\nScopingShim.prototype['getStyleAst'] = ScopingShim.prototype.getStyleAst;\nScopingShim.prototype['styleAstToString'] = ScopingShim.prototype.styleAstToString;\nScopingShim.prototype['flushCustomStyles'] = ScopingShim.prototype.flushCustomStyles;\nObject.defineProperties(ScopingShim.prototype, {\n  'nativeShadow': {\n    get() {\n      return nativeShadow;\n    }\n  },\n  'nativeCss': {\n    get() {\n      return nativeCssVariables;\n    }\n  }\n});","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport ScopingShim from '../src/scoping-shim.js'\nimport {nativeCssVariables, nativeShadow} from '../src/style-settings.js'\n\n/** @const {ScopingShim} */\nconst scopingShim = new ScopingShim();\n\nlet ApplyShim, CustomStyleInterface;\n\nif (window['ShadyCSS']) {\n  ApplyShim = window['ShadyCSS']['ApplyShim'];\n  CustomStyleInterface = window['ShadyCSS']['CustomStyleInterface'];\n}\n\nwindow.ShadyCSS = {\n  ScopingShim: scopingShim,\n  /**\n   * @param {!HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} elementExtends\n   */\n  prepareTemplate(template, elementName, elementExtends) {\n    scopingShim.flushCustomStyles();\n    scopingShim.prepareTemplate(template, elementName, elementExtends)\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   * @param {Object=} properties\n   */\n  styleSubtree(element, properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleSubtree(element, properties);\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   */\n  styleElement(element) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleElement(element);\n  },\n\n  /**\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleDocument(properties);\n  },\n\n  /**\n   * @param {Element} element\n   * @param {string} property\n   * @return {string}\n   */\n  getComputedStyleValue(element, property) {\n    return scopingShim.getComputedStyleValue(element, property);\n  },\n\n  nativeCss: nativeCssVariables,\n\n  nativeShadow: nativeShadow\n};\n\nif (ApplyShim) {\n  window.ShadyCSS.ApplyShim = ApplyShim;\n}\n\nif (CustomStyleInterface) {\n  window.ShadyCSS.CustomStyleInterface = CustomStyleInterface;\n}","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function() {\n  'use strict';\n  // It's desireable to provide a default stylesheet\n  // that's convenient for styling unresolved elements, but\n  // it's cumbersome to have to include this manually in every page.\n  // It would make sense to put inside some HTMLImport but\n  // the HTMLImports polyfill does not allow loading of stylesheets\n  // that block rendering. Therefore this injection is tolerated here.\n  //\n  // NOTE: position: relative fixes IE's failure to inherit opacity\n  // when a child is not statically positioned.\n  var style = document.createElement('style');\n  style.textContent = ''\n      + 'body {'\n      + 'transition: opacity ease-in 0.2s;'\n      + ' } \\n'\n      + 'body[unresolved] {'\n      + 'opacity: 0; display: block; overflow: hidden; position: relative;'\n      + ' } \\n'\n      ;\n  var head = document.querySelector('head');\n  head.insertBefore(style, head.firstChild);\n\n})();\n","/*\n *  @license\n *    Copyright 2017 Brigham Young University\n *\n *    Licensed under the Apache License, Version 2.0 (the \"License\");\n *    you may not use this file except in compliance with the License.\n *    You may obtain a copy of the License at\n *\n *        http://www.apache.org/licenses/LICENSE-2.0\n *\n *    Unless required by applicable law or agreed to in writing, software\n *    distributed under the License is distributed on an \"AS IS\" BASIS,\n *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n *    See the License for the specific language governing permissions and\n *    limitations under the License.\n */\n\"use strict\";\n\n//------ webcomponents-platform ------\nimport '../node_modules/webcomponents-platform/webcomponents-platform.js'\n//------ template ------\nimport '../node_modules/@webcomponents/template/template.js'\n//------ es6-promise ------\nimport '../node_modules/es6-promise/dist/es6-promise.auto.min.js'\n//------ pre-polyfill ------\nimport '../node_modules/webcomponents.js/src/pre-polyfill.js'\n//------ shadydom ------\nimport '../node_modules/@webcomponents/shadydom/src/shadydom.js'\n//------ custom-elements ------\nimport '../node_modules/@webcomponents/custom-elements/src/custom-elements.js'\n//------ shadycss ------\nimport '../node_modules/@webcomponents/shadycss/entrypoints/scoping-shim.js'\n//------ unresolved styles ------\nimport 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All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function(scope) {\n\n  'use strict';\n\n  // defaultPrevented is broken in IE.\n  // https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called\n  var workingDefaultPrevented = (function() {\n    var e = document.createEvent('Event');\n    e.initEvent('foo', true, true);\n    e.preventDefault();\n    return e.defaultPrevented;\n  })();\n\n  if (!workingDefaultPrevented) {\n    var origPreventDefault = Event.prototype.preventDefault;\n    Event.prototype.preventDefault = function() {\n      if (!this.cancelable) {\n        return;\n      }\n\n      origPreventDefault.call(this);\n\n      Object.defineProperty(this, 'defaultPrevented', {\n        get: function() {\n          return true;\n        },\n        configurable: true\n      });\n    };\n  }\n\n  var isIE = /Trident/.test(navigator.userAgent);\n\n  // CustomEvent constructor shim\n  if (!window.CustomEvent || isIE && (typeof window.CustomEvent !== 'function')) {\n    window.CustomEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('CustomEvent');\n      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);\n      return e;\n    };\n    window.CustomEvent.prototype = window.Event.prototype;\n  }\n\n  // Event constructor shim\n  if (!window.Event || isIE && (typeof window.Event !== 'function')) {\n    var origEvent = window.Event;\n    window.Event = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('Event');\n      e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));\n      return e;\n    };\n    if (origEvent) {\n      for (var i in origEvent) {\n        window.Event[i] = origEvent[i];\n      }\n    }\n    window.Event.prototype = origEvent.prototype;\n  }\n\n  if (!window.MouseEvent || isIE && (typeof window.MouseEvent !== 'function')) {\n    var origMouseEvent = window.MouseEvent;\n    window.MouseEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('MouseEvent');\n      e.initMouseEvent(inType,\n        Boolean(params.bubbles), Boolean(params.cancelable),\n        params.view || window, params.detail,\n        params.screenX, params.screenY, params.clientX, params.clientY,\n        params.ctrlKey, params.altKey, params.shiftKey, params.metaKey,\n        params.button, params.relatedTarget);\n      return e;\n    };\n    if (origMouseEvent) {\n      for (var i in origMouseEvent) {\n        window.MouseEvent[i] = origMouseEvent[i];\n      }\n    }\n    window.MouseEvent.prototype = origMouseEvent.prototype;\n  }\n\n  // ES6 stuff\n  if (!Array.from) {\n    Array.from = function (object) {\n      return [].slice.call(object);\n    };\n  }\n\n  if (!Object.assign) {\n    var assign = function(target, source) {\n      var n$ = Object.getOwnPropertyNames(source);\n      for (var i=0, p; i < n$.length; i++) {\n        p = n$[i];\n        target[p] = source[p];\n      }\n    }\n\n    Object.assign = function(target, sources) {\n      var args = [].slice.call(arguments, 1);\n      for (var i=0, s; i < args.length; i++) {\n        s = args[i];\n        if (s) {\n          assign(target, s);\n        }\n      }\n      return target;\n    }\n  }\n\n})(window.WebComponents);\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n// minimal template polyfill\n(function() {\n  'use strict';\n\n  var needsTemplate = (typeof HTMLTemplateElement === 'undefined');\n  var brokenDocFragment = !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment);\n  var needsDocFrag = false;\n\n  // NOTE: Replace DocumentFragment to work around IE11 bug that\n  // casues children of a document fragment modified while\n  // there is a mutation observer to not have a parentNode, or\n  // have a broken parentNode (!?!)\n  if (/Trident/.test(navigator.userAgent)) {\n    (function() {\n\n      needsDocFrag = true;\n\n      var origCloneNode = Node.prototype.cloneNode;\n      Node.prototype.cloneNode = function cloneNode(deep) {\n        var newDom = origCloneNode.call(this, deep);\n        if (this instanceof DocumentFragment) {\n          newDom.__proto__ = DocumentFragment.prototype;\n        }\n        return newDom;\n      };\n\n      // IE's DocumentFragment querySelector code doesn't work when\n      // called on an element instance\n      DocumentFragment.prototype.querySelectorAll = HTMLElement.prototype.querySelectorAll;\n      DocumentFragment.prototype.querySelector = HTMLElement.prototype.querySelector;\n\n      Object.defineProperties(DocumentFragment.prototype, {\n        'nodeType': {\n          get: function () {\n            return Node.DOCUMENT_FRAGMENT_NODE;\n          },\n          configurable: true\n        },\n\n        'localName': {\n          get: function () {\n            return undefined;\n          },\n          configurable: true\n        },\n\n        'nodeName': {\n          get: function () {\n            return '#document-fragment';\n          },\n          configurable: true\n        }\n      });\n\n      var origInsertBefore = Node.prototype.insertBefore;\n      function insertBefore(newNode, refNode) {\n        if (newNode instanceof DocumentFragment) {\n          var child;\n          while ((child = newNode.firstChild)) {\n            origInsertBefore.call(this, child, refNode);\n          }\n        } else {\n          origInsertBefore.call(this, newNode, refNode);\n        }\n        return newNode;\n      }\n      Node.prototype.insertBefore = insertBefore;\n\n      var origAppendChild = Node.prototype.appendChild;\n      Node.prototype.appendChild = function appendChild(child) {\n        if (child instanceof DocumentFragment) {\n          insertBefore.call(this, child, null);\n        } else {\n          origAppendChild.call(this, child);\n        }\n        return child;\n      };\n\n      var origRemoveChild = Node.prototype.removeChild;\n      var origReplaceChild = Node.prototype.replaceChild;\n      Node.prototype.replaceChild = function replaceChild(newChild, oldChild) {\n        if (newChild instanceof DocumentFragment) {\n          insertBefore.call(this, newChild, oldChild);\n          origRemoveChild.call(this, oldChild);\n        } else {\n          origReplaceChild.call(this, newChild, oldChild);\n        }\n        return oldChild;\n      };\n\n      Document.prototype.createDocumentFragment = function createDocumentFragment() {\n        var frag = this.createElement('df');\n        frag.__proto__ = DocumentFragment.prototype;\n        return frag;\n      };\n\n      var origImportNode = Document.prototype.importNode;\n      Document.prototype.importNode = function importNode(impNode, deep) {\n        deep = deep || false;\n        var newNode = origImportNode.call(this, impNode, deep);\n        if (impNode instanceof DocumentFragment) {\n          newNode.__proto__ = DocumentFragment.prototype;\n        }\n        return newNode;\n      };\n    })();\n  }\n\n  // NOTE: we rely on this cloneNode not causing element upgrade.\n  // This means this polyfill must load before the CE polyfill and\n  // this would need to be re-worked if a browser supports native CE\n  // but not <template>.\n  var capturedCloneNode = Node.prototype.cloneNode;\n  var capturedCreateElement = Document.prototype.createElement;\n  var capturedImportNode = Document.prototype.importNode;\n  var capturedRemoveChild = Node.prototype.removeChild;\n  var capturedAppendChild = Node.prototype.appendChild;\n  var capturedReplaceChild = Node.prototype.replaceChild;\n\n  var elementQuerySelectorAll = Element.prototype.querySelectorAll;\n  var docQuerySelectorAll = Document.prototype.querySelectorAll;\n  var fragQuerySelectorAll = DocumentFragment.prototype.querySelectorAll;\n\n  var scriptSelector = 'script:not([type]),script[type=\"application/javascript\"],script[type=\"text/javascript\"]';\n\n  function QSA(node, selector) {\n    // IE 11 throws a SyntaxError with `scriptSelector` if the node has no children due to the `:not([type])` syntax\n    if (!node.childNodes.length) {\n      return [];\n    }\n    switch (node.nodeType) {\n      case Node.DOCUMENT_NODE:\n        return docQuerySelectorAll.call(node, selector);\n      case Node.DOCUMENT_FRAGMENT_NODE:\n        return fragQuerySelectorAll.call(node, selector);\n      default:\n        return elementQuerySelectorAll.call(node, selector);\n    }\n  }\n\n  // returns true if nested templates cannot be cloned (they cannot be on\n  // some impl's like Safari 8 and Edge)\n  // OR if cloning a document fragment does not result in a document fragment\n  var needsCloning = (function() {\n    if (!needsTemplate) {\n      var t = document.createElement('template');\n      var t2 = document.createElement('template');\n      t2.content.appendChild(document.createElement('div'));\n      t.content.appendChild(t2);\n      var clone = t.cloneNode(true);\n      return (clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0\n        || brokenDocFragment);\n    }\n  })();\n\n  var TEMPLATE_TAG = 'template';\n  var PolyfilledHTMLTemplateElement = function() {};\n\n  if (needsTemplate) {\n\n    var contentDoc = document.implementation.createHTMLDocument('template');\n    var canDecorate = true;\n\n    var templateStyle = document.createElement('style');\n    templateStyle.textContent = TEMPLATE_TAG + '{display:none;}';\n\n    var head = document.head;\n    head.insertBefore(templateStyle, head.firstElementChild);\n\n    /**\n      Provides a minimal shim for the <template> element.\n    */\n    PolyfilledHTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);\n\n\n    // if elements do not have `innerHTML` on instances, then\n    // templates can be patched by swizzling their prototypes.\n    var canProtoPatch =\n      !(document.createElement('div').hasOwnProperty('innerHTML'));\n\n    /**\n      The `decorate` method moves element children to the template's `content`.\n      NOTE: there is no support for dynamically adding elements to templates.\n    */\n    PolyfilledHTMLTemplateElement.decorate = function(template) {\n      // if the template is decorated, return fast\n      if (template.content) {\n        return;\n      }\n      template.content = contentDoc.createDocumentFragment();\n      var child;\n      while ((child = template.firstChild)) {\n        capturedAppendChild.call(template.content, child);\n      }\n      // NOTE: prefer prototype patching for performance and\n      // because on some browsers (IE11), re-defining `innerHTML`\n      // can result in intermittent errors.\n      if (canProtoPatch) {\n        template.__proto__ = PolyfilledHTMLTemplateElement.prototype;\n      } else {\n        template.cloneNode = function(deep) {\n          return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n        };\n        // add innerHTML to template, if possible\n        // Note: this throws on Safari 7\n        if (canDecorate) {\n          try {\n            defineInnerHTML(template);\n            defineOuterHTML(template);\n          } catch (err) {\n            canDecorate = false;\n          }\n        }\n      }\n      // bootstrap recursively\n      PolyfilledHTMLTemplateElement.bootstrap(template.content);\n    };\n\n    var defineInnerHTML = function defineInnerHTML(obj) {\n      Object.defineProperty(obj, 'innerHTML', {\n        get: function() {\n          var o = '';\n          for (var e = this.content.firstChild; e; e = e.nextSibling) {\n            o += e.outerHTML || escapeData(e.data);\n          }\n          return o;\n        },\n        set: function(text) {\n          contentDoc.body.innerHTML = text;\n          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);\n          while (this.content.firstChild) {\n            capturedRemoveChild.call(this.content, this.content.firstChild);\n          }\n          while (contentDoc.body.firstChild) {\n            capturedAppendChild.call(this.content, contentDoc.body.firstChild);\n          }\n        },\n        configurable: true\n      });\n    };\n\n    var defineOuterHTML = function defineOuterHTML(obj) {\n      Object.defineProperty(obj, 'outerHTML', {\n        get: function() {\n          return '<' + TEMPLATE_TAG + '>' + this.innerHTML + '</' + TEMPLATE_TAG + '>';\n        },\n        set: function(innerHTML) {\n          if (this.parentNode) {\n            contentDoc.body.innerHTML = innerHTML;\n            var docFrag = this.ownerDocument.createDocumentFragment();\n            while (contentDoc.body.firstChild) {\n              capturedAppendChild.call(docFrag, contentDoc.body.firstChild);\n            }\n            capturedReplaceChild.call(this.parentNode, docFrag, this);\n          } else {\n            throw new Error(\"Failed to set the 'outerHTML' property on 'Element': This element has no parent node.\");\n          }\n        },\n        configurable: true\n      });\n    };\n\n    defineInnerHTML(PolyfilledHTMLTemplateElement.prototype);\n    defineOuterHTML(PolyfilledHTMLTemplateElement.prototype);\n\n    /**\n      The `bootstrap` method is called automatically and \"fixes\" all\n      <template> elements in the document referenced by the `doc` argument.\n    */\n    PolyfilledHTMLTemplateElement.bootstrap = function bootstrap(doc) {\n      var templates = QSA(doc, TEMPLATE_TAG);\n      for (var i=0, l=templates.length, t; (i<l) && (t=templates[i]); i++) {\n        PolyfilledHTMLTemplateElement.decorate(t);\n      }\n    };\n\n    // auto-bootstrapping for main document\n    document.addEventListener('DOMContentLoaded', function() {\n      PolyfilledHTMLTemplateElement.bootstrap(document);\n    });\n\n    // Patch document.createElement to ensure newly created templates have content\n    Document.prototype.createElement = function createElement() {\n      var el = capturedCreateElement.apply(this, arguments);\n      if (el.localName === 'template') {\n        PolyfilledHTMLTemplateElement.decorate(el);\n      }\n      return el;\n    };\n\n    var escapeDataRegExp = /[&\\u00A0<>]/g;\n\n    var escapeReplace = function escapeReplace(c) {\n      switch (c) {\n        case '&':\n          return '&amp;';\n        case '<':\n          return '&lt;';\n        case '>':\n          return '&gt;';\n        case '\\u00A0':\n          return '&nbsp;';\n      }\n    };\n\n    var escapeData = function escapeData(s) {\n      return s.replace(escapeDataRegExp, escapeReplace);\n    };\n  }\n\n  // make cloning/importing work!\n  if (needsTemplate || needsCloning) {\n\n    PolyfilledHTMLTemplateElement._cloneNode = function _cloneNode(template, deep) {\n      var clone = capturedCloneNode.call(template, false);\n      // NOTE: decorate doesn't auto-fix children because they are already\n      // decorated so they need special clone fixup.\n      if (this.decorate) {\n        this.decorate(clone);\n      }\n      if (deep) {\n        // NOTE: use native clone node to make sure CE's wrapped\n        // cloneNode does not cause elements to upgrade.\n        capturedAppendChild.call(clone.content, capturedCloneNode.call(template.content, true));\n        // now ensure nested templates are cloned correctly.\n        fixClonedDom(clone.content, template.content);\n      }\n      return clone;\n    };\n\n    // Given a source and cloned subtree, find <template>'s in the cloned\n    // subtree and replace them with cloned <template>'s from source.\n    // We must do this because only the source templates have proper .content.\n    var fixClonedDom = function fixClonedDom(clone, source) {\n      // do nothing if cloned node is not an element\n      if (!source.querySelectorAll) return;\n      // these two lists should be coincident\n      var s$ = QSA(source, TEMPLATE_TAG);\n      if (s$.length === 0) {\n        return;\n      }\n      var t$ = QSA(clone, TEMPLATE_TAG);\n      for (var i=0, l=t$.length, t, s; i<l; i++) {\n        s = s$[i];\n        t = t$[i];\n        if (PolyfilledHTMLTemplateElement && PolyfilledHTMLTemplateElement.decorate) {\n          PolyfilledHTMLTemplateElement.decorate(s);\n        }\n        capturedReplaceChild.call(t.parentNode, cloneNode.call(s, true), t);\n      }\n    };\n\n    // make sure scripts inside of a cloned template are executable\n    var fixClonedScripts = function fixClonedScripts(fragment) {\n      var scripts = QSA(fragment, scriptSelector);\n      for (var ns, s, i = 0; i < scripts.length; i++) {\n        s = scripts[i];\n        ns = capturedCreateElement.call(document, 'script');\n        ns.textContent = s.textContent;\n        var attrs = s.attributes;\n        for (var ai = 0, a; ai < attrs.length; ai++) {\n          a = attrs[ai];\n          ns.setAttribute(a.name, a.value);\n        }\n        capturedReplaceChild.call(s.parentNode, ns, s);\n      }\n    };\n\n    // override all cloning to fix the cloned subtree to contain properly\n    // cloned templates.\n    var cloneNode = Node.prototype.cloneNode = function cloneNode(deep) {\n      var dom;\n      // workaround for Edge bug cloning documentFragments\n      // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8619646/\n      if (!needsDocFrag && brokenDocFragment && this instanceof DocumentFragment) {\n        if (!deep) {\n          return this.ownerDocument.createDocumentFragment();\n        } else {\n          dom = importNode.call(this.ownerDocument, this, true);\n        }\n      } else if (this.nodeType === Node.ELEMENT_NODE && this.localName === TEMPLATE_TAG) {\n        dom = PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n      } else {\n        dom = capturedCloneNode.call(this, deep);\n      }\n      // template.content is cloned iff `deep`.\n      if (deep) {\n        fixClonedDom(dom, this);\n      }\n      return dom;\n    };\n\n    // NOTE: we are cloning instead of importing <template>'s.\n    // However, the ownerDocument of the cloned template will be correct!\n    // This is because the native import node creates the right document owned\n    // subtree and `fixClonedDom` inserts cloned templates into this subtree,\n    // thus updating the owner doc.\n    var importNode = Document.prototype.importNode = function importNode(element, deep) {\n      deep = deep || false;\n      if (element.localName === TEMPLATE_TAG) {\n        return PolyfilledHTMLTemplateElement._cloneNode(element, deep);\n      } else {\n        var dom = capturedImportNode.call(this, element, deep);\n        if (deep) {\n          fixClonedDom(dom, element);\n          fixClonedScripts(dom);\n        }\n        return dom;\n      }\n    };\n  }\n\n  if (needsTemplate) {\n    window.HTMLTemplateElement = PolyfilledHTMLTemplateElement;\n  }\n\n})();\n","export function objectOrFunction(x) {\n  let type = typeof x;\n  return x !== null && (type === 'object' || type === 'function');\n}\n\nexport function isFunction(x) {\n  return typeof x === 'function';\n}\n\nexport function isMaybeThenable(x) {\n  return x !== null && typeof x === 'object';\n}\n\nlet _isArray;\nif (Array.isArray) {\n  _isArray = Array.isArray;\n} else {\n  _isArray = x => Object.prototype.toString.call(x) === '[object Array]';\n}\n\nexport const isArray = _isArray;\n","let len = 0;\nlet vertxNext;\nlet customSchedulerFn;\n\nexport var asap = function asap(callback, arg) {\n  queue[len] = callback;\n  queue[len + 1] = arg;\n  len += 2;\n  if (len === 2) {\n    // If len is 2, that means that we need to schedule an async flush.\n    // If additional callbacks are queued before the queue is flushed, they\n    // will be processed by this flush that we are scheduling.\n    if (customSchedulerFn) {\n      customSchedulerFn(flush);\n    } else {\n      scheduleFlush();\n    }\n  }\n}\n\nexport function setScheduler(scheduleFn) {\n  customSchedulerFn = scheduleFn;\n}\n\nexport function setAsap(asapFn) {\n  asap = asapFn;\n}\n\nconst browserWindow = (typeof window !== 'undefined') ? window : undefined;\nconst browserGlobal = browserWindow || {};\nconst BrowserMutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver;\nconst isNode = typeof self === 'undefined' && typeof process !== 'undefined' && {}.toString.call(process) === '[object process]';\n\n// test for web worker but not in IE10\nconst isWorker = typeof Uint8ClampedArray !== 'undefined' &&\n  typeof importScripts !== 'undefined' &&\n  typeof MessageChannel !== 'undefined';\n\n// node\nfunction useNextTick() {\n  // node version 0.10.x displays a deprecation warning when nextTick is used recursively\n  // see https://github.com/cujojs/when/issues/410 for details\n  return () => process.nextTick(flush);\n}\n\n// vertx\nfunction useVertxTimer() {\n  if (typeof vertxNext !== 'undefined') {\n    return function() {\n      vertxNext(flush);\n    };\n  }\n\n  return useSetTimeout();\n}\n\nfunction useMutationObserver() {\n  let iterations = 0;\n  const observer = new BrowserMutationObserver(flush);\n  const node = document.createTextNode('');\n  observer.observe(node, { characterData: true });\n\n  return () => {\n    node.data = (iterations = ++iterations % 2);\n  };\n}\n\n// web worker\nfunction useMessageChannel() {\n  const channel = new MessageChannel();\n  channel.port1.onmessage = flush;\n  return () => channel.port2.postMessage(0);\n}\n\nfunction useSetTimeout() {\n  // Store setTimeout reference so es6-promise will be unaffected by\n  // other code modifying setTimeout (like sinon.useFakeTimers())\n  const globalSetTimeout = setTimeout;\n  return () => globalSetTimeout(flush, 1);\n}\n\nconst queue = new Array(1000);\nfunction flush() {\n  for (let i = 0; i < len; i+=2) {\n    let callback = queue[i];\n    let arg = queue[i+1];\n\n    callback(arg);\n\n    queue[i] = undefined;\n    queue[i+1] = undefined;\n  }\n\n  len = 0;\n}\n\nfunction attemptVertx() {\n  try {\n    const vertx = Function('return this')().require('vertx');\n    vertxNext = vertx.runOnLoop || vertx.runOnContext;\n    return useVertxTimer();\n  } catch(e) {\n    return useSetTimeout();\n  }\n}\n\nlet scheduleFlush;\n// Decide what async method to use to triggering processing of queued callbacks:\nif (isNode) {\n  scheduleFlush = useNextTick();\n} else if (BrowserMutationObserver) {\n  scheduleFlush = useMutationObserver();\n} else if (isWorker) {\n  scheduleFlush = useMessageChannel();\n} else if (browserWindow === undefined && typeof require === 'function') {\n  scheduleFlush = attemptVertx();\n} else {\n  scheduleFlush = useSetTimeout();\n}\n","import {\n  invokeCallback,\n  subscribe,\n  FULFILLED,\n  REJECTED,\n  noop,\n  makePromise,\n  PROMISE_ID\n} from './-internal';\n\nimport { asap } from './asap';\n\nexport default function then(onFulfillment, onRejection) {\n  const parent = this;\n\n  const child = new this.constructor(noop);\n\n  if (child[PROMISE_ID] === undefined) {\n    makePromise(child);\n  }\n\n  const { _state } = parent;\n\n  if (_state) {\n    const callback = arguments[_state - 1];\n    asap(() => invokeCallback(_state, child, callback, parent._result));\n  } else {\n    subscribe(parent, child, onFulfillment, onRejection);\n  }\n\n  return child;\n}\n","import {\n  noop,\n  resolve as _resolve\n} from '../-internal';\n\n/**\n  `Promise.resolve` returns a promise that will become resolved with the\n  passed `value`. It is shorthand for the following:\n\n  ```javascript\n  let promise = new Promise(function(resolve, reject){\n    resolve(1);\n  });\n\n  promise.then(function(value){\n    // value === 1\n  });\n  ```\n\n  Instead of writing the above, your code now simply becomes the following:\n\n  ```javascript\n  let promise = Promise.resolve(1);\n\n  promise.then(function(value){\n    // value === 1\n  });\n  ```\n\n  @method resolve\n  @static\n  @param {Any} value value that the returned promise will be resolved with\n  Useful for tooling.\n  @return {Promise} a promise that will become fulfilled with the given\n  `value`\n*/\nexport default function resolve(object) {\n  /*jshint validthis:true */\n  let Constructor = this;\n\n  if (object && typeof object === 'object' && object.constructor === Constructor) {\n    return object;\n  }\n\n  let promise = new Constructor(noop);\n  _resolve(promise, object);\n  return promise;\n}\n","import {\n  objectOrFunction,\n  isFunction\n} from './utils';\n\nimport {\n  asap\n} from './asap';\n\nimport originalThen from './then';\nimport originalResolve from './promise/resolve';\n\nexport const PROMISE_ID = Math.random().toString(36).substring(2);\n\nfunction noop() {}\n\nconst PENDING   = void 0;\nconst FULFILLED = 1;\nconst REJECTED  = 2;\n\nconst TRY_CATCH_ERROR = { error: null };\n\nfunction selfFulfillment() {\n  return new TypeError(\"You cannot resolve a promise with itself\");\n}\n\nfunction cannotReturnOwn() {\n  return new TypeError('A promises callback cannot return that same promise.');\n}\n\nfunction getThen(promise) {\n  try {\n    return promise.then;\n  } catch(error) {\n    TRY_CATCH_ERROR.error = error;\n    return TRY_CATCH_ERROR;\n  }\n}\n\nfunction tryThen(then, value, fulfillmentHandler, rejectionHandler) {\n  try {\n    then.call(value, fulfillmentHandler, rejectionHandler);\n  } catch(e) {\n    return e;\n  }\n}\n\nfunction handleForeignThenable(promise, thenable, then) {\n   asap(promise => {\n    var sealed = false;\n    var error = tryThen(then, thenable, value => {\n      if (sealed) { return; }\n      sealed = true;\n      if (thenable !== value) {\n        resolve(promise, value);\n      } else {\n        fulfill(promise, value);\n      }\n    }, reason => {\n      if (sealed) { return; }\n      sealed = true;\n\n      reject(promise, reason);\n    }, 'Settle: ' + (promise._label || ' unknown promise'));\n\n    if (!sealed && error) {\n      sealed = true;\n      reject(promise, error);\n    }\n  }, promise);\n}\n\nfunction handleOwnThenable(promise, thenable) {\n  if (thenable._state === FULFILLED) {\n    fulfill(promise, thenable._result);\n  } else if (thenable._state === REJECTED) {\n    reject(promise, thenable._result);\n  } else {\n    subscribe(thenable, undefined, value  => resolve(promise, value),\n                                   reason => reject(promise, reason))\n  }\n}\n\nfunction handleMaybeThenable(promise, maybeThenable, then) {\n  if (maybeThenable.constructor === promise.constructor &&\n      then === originalThen &&\n      maybeThenable.constructor.resolve === originalResolve) {\n    handleOwnThenable(promise, maybeThenable);\n  } else {\n    if (then === TRY_CATCH_ERROR) {\n      reject(promise, TRY_CATCH_ERROR.error);\n      TRY_CATCH_ERROR.error = null;\n    } else if (then === undefined) {\n      fulfill(promise, maybeThenable);\n    } else if (isFunction(then)) {\n      handleForeignThenable(promise, maybeThenable, then);\n    } else {\n      fulfill(promise, maybeThenable);\n    }\n  }\n}\n\nfunction resolve(promise, value) {\n  if (promise === value) {\n    reject(promise, selfFulfillment());\n  } else if (objectOrFunction(value)) {\n    handleMaybeThenable(promise, value, getThen(value));\n  } else {\n    fulfill(promise, value);\n  }\n}\n\nfunction publishRejection(promise) {\n  if (promise._onerror) {\n    promise._onerror(promise._result);\n  }\n\n  publish(promise);\n}\n\nfunction fulfill(promise, value) {\n  if (promise._state !== PENDING) { return; }\n\n  promise._result = value;\n  promise._state = FULFILLED;\n\n  if (promise._subscribers.length !== 0) {\n    asap(publish, promise);\n  }\n}\n\nfunction reject(promise, reason) {\n  if (promise._state !== PENDING) { return; }\n  promise._state = REJECTED;\n  promise._result = reason;\n\n  asap(publishRejection, promise);\n}\n\nfunction subscribe(parent, child, onFulfillment, onRejection) {\n  let { _subscribers } = parent;\n  let { length } = _subscribers;\n\n  parent._onerror = null;\n\n  _subscribers[length] = child;\n  _subscribers[length + FULFILLED] = onFulfillment;\n  _subscribers[length + REJECTED]  = onRejection;\n\n  if (length === 0 && parent._state) {\n    asap(publish, parent);\n  }\n}\n\nfunction publish(promise) {\n  let subscribers = promise._subscribers;\n  let settled = promise._state;\n\n  if (subscribers.length === 0) { return; }\n\n  let child, callback, detail = promise._result;\n\n  for (let i = 0; i < subscribers.length; i += 3) {\n    child = subscribers[i];\n    callback = subscribers[i + settled];\n\n    if (child) {\n      invokeCallback(settled, child, callback, detail);\n    } else {\n      callback(detail);\n    }\n  }\n\n  promise._subscribers.length = 0;\n}\n\n\nfunction tryCatch(callback, detail) {\n  try {\n    return callback(detail);\n  } catch(e) {\n    TRY_CATCH_ERROR.error = e;\n    return TRY_CATCH_ERROR;\n  }\n}\n\nfunction invokeCallback(settled, promise, callback, detail) {\n  let hasCallback = isFunction(callback),\n      value, error, succeeded, failed;\n\n  if (hasCallback) {\n    value = tryCatch(callback, detail);\n\n    if (value === TRY_CATCH_ERROR) {\n      failed = true;\n      error = value.error;\n      value.error = null;\n    } else {\n      succeeded = true;\n    }\n\n    if (promise === value) {\n      reject(promise, cannotReturnOwn());\n      return;\n    }\n\n  } else {\n    value = detail;\n    succeeded = true;\n  }\n\n  if (promise._state !== PENDING) {\n    // noop\n  } else if (hasCallback && succeeded) {\n    resolve(promise, value);\n  } else if (failed) {\n    reject(promise, error);\n  } else if (settled === FULFILLED) {\n    fulfill(promise, value);\n  } else if (settled === REJECTED) {\n    reject(promise, value);\n  }\n}\n\nfunction initializePromise(promise, resolver) {\n  try {\n    resolver(function resolvePromise(value){\n      resolve(promise, value);\n    }, function rejectPromise(reason) {\n      reject(promise, reason);\n    });\n  } catch(e) {\n    reject(promise, e);\n  }\n}\n\nlet id = 0;\nfunction nextId() {\n  return id++;\n}\n\nfunction makePromise(promise) {\n  promise[PROMISE_ID] = id++;\n  promise._state = undefined;\n  promise._result = undefined;\n  promise._subscribers = [];\n}\n\nexport {\n  nextId,\n  makePromise,\n  getThen,\n  noop,\n  resolve,\n  reject,\n  fulfill,\n  subscribe,\n  publish,\n  publishRejection,\n  initializePromise,\n  invokeCallback,\n  FULFILLED,\n  REJECTED,\n  PENDING,\n  handleMaybeThenable\n};\n","import {\n  isArray,\n  isMaybeThenable\n} from './utils';\nimport {\n  noop,\n  reject,\n  fulfill,\n  subscribe,\n  FULFILLED,\n  REJECTED,\n  PENDING,\n  getThen,\n  handleMaybeThenable\n} from './-internal';\n\nimport then from './then';\nimport Promise from './promise';\nimport originalResolve from './promise/resolve';\nimport originalThen from './then';\nimport { makePromise, PROMISE_ID } from './-internal';\n\nfunction validationError() {\n  return new Error('Array Methods must be provided an Array');\n};\n\nexport default class Enumerator {\n  constructor(Constructor, input) {\n    this._instanceConstructor = Constructor;\n    this.promise = new Constructor(noop);\n\n    if (!this.promise[PROMISE_ID]) {\n      makePromise(this.promise);\n    }\n\n    if (isArray(input)) {\n      this.length     = input.length;\n      this._remaining = input.length;\n\n      this._result = new Array(this.length);\n\n      if (this.length === 0) {\n        fulfill(this.promise, this._result);\n      } else {\n        this.length = this.length || 0;\n        this._enumerate(input);\n        if (this._remaining === 0) {\n          fulfill(this.promise, this._result);\n        }\n      }\n    } else {\n      reject(this.promise, validationError());\n    }\n  }\n  _enumerate(input) {\n    for (let i = 0; this._state === PENDING && i < input.length; i++) {\n      this._eachEntry(input[i], i);\n    }\n  }\n\n  _eachEntry(entry, i) {\n    let c = this._instanceConstructor;\n    let { resolve } = c;\n\n    if (resolve === originalResolve) {\n      let then = getThen(entry);\n\n      if (then === originalThen &&\n        entry._state !== PENDING) {\n        this._settledAt(entry._state, i, entry._result);\n      } else if (typeof then !== 'function') {\n        this._remaining--;\n        this._result[i] = entry;\n      } else if (c === Promise) {\n        let promise = new c(noop);\n        handleMaybeThenable(promise, entry, then);\n        this._willSettleAt(promise, i);\n      } else {\n        this._willSettleAt(new c(resolve => resolve(entry)), i);\n      }\n    } else {\n      this._willSettleAt(resolve(entry), i);\n    }\n  }\n\n  _settledAt(state, i, value) {\n    let { promise } = this;\n\n    if (promise._state === PENDING) {\n      this._remaining--;\n\n      if (state === REJECTED) {\n        reject(promise, value);\n      } else {\n        this._result[i] = value;\n      }\n    }\n\n    if (this._remaining === 0) {\n      fulfill(promise, this._result);\n    }\n  }\n\n  _willSettleAt(promise, i) {\n    let enumerator = this;\n\n    subscribe(\n      promise, undefined,\n      value => enumerator._settledAt(FULFILLED, i, value),\n      reason => enumerator._settledAt(REJECTED, i, reason)\n    );\n  }\n};\n","import Enumerator from '../enumerator';\n\n/**\n  `Promise.all` accepts an array of promises, and returns a new promise which\n  is fulfilled with an array of fulfillment values for the passed promises, or\n  rejected with the reason of the first passed promise to be rejected. It casts all\n  elements of the passed iterable to promises as it runs this algorithm.\n\n  Example:\n\n  ```javascript\n  let promise1 = resolve(1);\n  let promise2 = resolve(2);\n  let promise3 = resolve(3);\n  let promises = [ promise1, promise2, promise3 ];\n\n  Promise.all(promises).then(function(array){\n    // The array here would be [ 1, 2, 3 ];\n  });\n  ```\n\n  If any of the `promises` given to `all` are rejected, the first promise\n  that is rejected will be given as an argument to the returned promises's\n  rejection handler. For example:\n\n  Example:\n\n  ```javascript\n  let promise1 = resolve(1);\n  let promise2 = reject(new Error(\"2\"));\n  let promise3 = reject(new Error(\"3\"));\n  let promises = [ promise1, promise2, promise3 ];\n\n  Promise.all(promises).then(function(array){\n    // Code here never runs because there are rejected promises!\n  }, function(error) {\n    // error.message === \"2\"\n  });\n  ```\n\n  @method all\n  @static\n  @param {Array} entries array of promises\n  @param {String} label optional string for labeling the promise.\n  Useful for tooling.\n  @return {Promise} promise that is fulfilled when all `promises` have been\n  fulfilled, or rejected if any of them become rejected.\n  @static\n*/\nexport default function all(entries) {\n  return new Enumerator(this, entries).promise;\n}\n","import {\n  isArray\n} from \"../utils\";\n\n/**\n  `Promise.race` returns a new promise which is settled in the same way as the\n  first passed promise to settle.\n\n  Example:\n\n  ```javascript\n  let promise1 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 1');\n    }, 200);\n  });\n\n  let promise2 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 2');\n    }, 100);\n  });\n\n  Promise.race([promise1, promise2]).then(function(result){\n    // result === 'promise 2' because it was resolved before promise1\n    // was resolved.\n  });\n  ```\n\n  `Promise.race` is deterministic in that only the state of the first\n  settled promise matters. For example, even if other promises given to the\n  `promises` array argument are resolved, but the first settled promise has\n  become rejected before the other promises became fulfilled, the returned\n  promise will become rejected:\n\n  ```javascript\n  let promise1 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 1');\n    }, 200);\n  });\n\n  let promise2 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      reject(new Error('promise 2'));\n    }, 100);\n  });\n\n  Promise.race([promise1, promise2]).then(function(result){\n    // Code here never runs\n  }, function(reason){\n    // reason.message === 'promise 2' because promise 2 became rejected before\n    // promise 1 became fulfilled\n  });\n  ```\n\n  An example real-world use case is implementing timeouts:\n\n  ```javascript\n  Promise.race([ajax('foo.json'), timeout(5000)])\n  ```\n\n  @method race\n  @static\n  @param {Array} promises array of promises to observe\n  Useful for tooling.\n  @return {Promise} a promise which settles in the same way as the first passed\n  promise to settle.\n*/\nexport default function race(entries) {\n  /*jshint validthis:true */\n  let Constructor = this;\n\n  if (!isArray(entries)) {\n    return new Constructor((_, reject) => reject(new TypeError('You must pass an array to race.')));\n  } else {\n    return new Constructor((resolve, reject) => {\n      let length = entries.length;\n      for (let i = 0; i < length; i++) {\n        Constructor.resolve(entries[i]).then(resolve, reject);\n      }\n    });\n  }\n}\n","import {\n  noop,\n  reject as _reject\n} from '../-internal';\n\n/**\n  `Promise.reject` returns a promise rejected with the passed `reason`.\n  It is shorthand for the following:\n\n  ```javascript\n  let promise = new Promise(function(resolve, reject){\n    reject(new Error('WHOOPS'));\n  });\n\n  promise.then(function(value){\n    // Code here doesn't run because the promise is rejected!\n  }, function(reason){\n    // reason.message === 'WHOOPS'\n  });\n  ```\n\n  Instead of writing the above, your code now simply becomes the following:\n\n  ```javascript\n  let promise = Promise.reject(new Error('WHOOPS'));\n\n  promise.then(function(value){\n    // Code here doesn't run because the promise is rejected!\n  }, function(reason){\n    // reason.message === 'WHOOPS'\n  });\n  ```\n\n  @method reject\n  @static\n  @param {Any} reason value that the returned promise will be rejected with.\n  Useful for tooling.\n  @return {Promise} a promise rejected with the given `reason`.\n*/\nexport default function reject(reason) {\n  /*jshint validthis:true */\n  let Constructor = this;\n  let promise = new Constructor(noop);\n  _reject(promise, reason);\n  return promise;\n}\n","import {\n  isFunction\n} from './utils';\nimport {\n  noop,\n  nextId,\n  PROMISE_ID,\n  initializePromise\n} from './-internal';\nimport {\n  asap,\n  setAsap,\n  setScheduler\n} from './asap';\n\nimport all from './promise/all';\nimport race from './promise/race';\nimport Resolve from './promise/resolve';\nimport Reject from './promise/reject';\nimport then from './then';\n\nfunction needsResolver() {\n  throw new TypeError('You must pass a resolver function as the first argument to the promise constructor');\n}\n\nfunction needsNew() {\n  throw new TypeError(\"Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function.\");\n}\n\n/**\n  Promise objects represent the eventual result of an asynchronous operation. The\n  primary way of interacting with a promise is through its `then` method, which\n  registers callbacks to receive either a promise's eventual value or the reason\n  why the promise cannot be fulfilled.\n\n  Terminology\n  -----------\n\n  - `promise` is an object or function with a `then` method whose behavior conforms to this specification.\n  - `thenable` is an object or function that defines a `then` method.\n  - `value` is any legal JavaScript value (including undefined, a thenable, or a promise).\n  - `exception` is a value that is thrown using the throw statement.\n  - `reason` is a value that indicates why a promise was rejected.\n  - `settled` the final resting state of a promise, fulfilled or rejected.\n\n  A promise can be in one of three states: pending, fulfilled, or rejected.\n\n  Promises that are fulfilled have a fulfillment value and are in the fulfilled\n  state.  Promises that are rejected have a rejection reason and are in the\n  rejected state.  A fulfillment value is never a thenable.\n\n  Promises can also be said to *resolve* a value.  If this value is also a\n  promise, then the original promise's settled state will match the value's\n  settled state.  So a promise that *resolves* a promise that rejects will\n  itself reject, and a promise that *resolves* a promise that fulfills will\n  itself fulfill.\n\n\n  Basic Usage:\n  ------------\n\n  ```js\n  let promise = new Promise(function(resolve, reject) {\n    // on success\n    resolve(value);\n\n    // on failure\n    reject(reason);\n  });\n\n  promise.then(function(value) {\n    // on fulfillment\n  }, function(reason) {\n    // on rejection\n  });\n  ```\n\n  Advanced Usage:\n  ---------------\n\n  Promises shine when abstracting away asynchronous interactions such as\n  `XMLHttpRequest`s.\n\n  ```js\n  function getJSON(url) {\n    return new Promise(function(resolve, reject){\n      let xhr = new XMLHttpRequest();\n\n      xhr.open('GET', url);\n      xhr.onreadystatechange = handler;\n      xhr.responseType = 'json';\n      xhr.setRequestHeader('Accept', 'application/json');\n      xhr.send();\n\n      function handler() {\n        if (this.readyState === this.DONE) {\n          if (this.status === 200) {\n            resolve(this.response);\n          } else {\n            reject(new Error('getJSON: `' + url + '` failed with status: [' + this.status + ']'));\n          }\n        }\n      };\n    });\n  }\n\n  getJSON('/posts.json').then(function(json) {\n    // on fulfillment\n  }, function(reason) {\n    // on rejection\n  });\n  ```\n\n  Unlike callbacks, promises are great composable primitives.\n\n  ```js\n  Promise.all([\n    getJSON('/posts'),\n    getJSON('/comments')\n  ]).then(function(values){\n    values[0] // => postsJSON\n    values[1] // => commentsJSON\n\n    return values;\n  });\n  ```\n\n  @class Promise\n  @param {Function} resolver\n  Useful for tooling.\n  @constructor\n*/\n\nclass Promise {\n  constructor(resolver) {\n    this[PROMISE_ID] = nextId();\n    this._result = this._state = undefined;\n    this._subscribers = [];\n\n    if (noop !== resolver) {\n      typeof resolver !== 'function' && needsResolver();\n      this instanceof Promise ? initializePromise(this, resolver) : needsNew();\n    }\n  }\n\n  /**\n  The primary way of interacting with a promise is through its `then` method,\n  which registers callbacks to receive either a promise's eventual value or the\n  reason why the promise cannot be fulfilled.\n\n  ```js\n  findUser().then(function(user){\n    // user is available\n  }, function(reason){\n    // user is unavailable, and you are given the reason why\n  });\n  ```\n\n  Chaining\n  --------\n\n  The return value of `then` is itself a promise.  This second, 'downstream'\n  promise is resolved with the return value of the first promise's fulfillment\n  or rejection handler, or rejected if the handler throws an exception.\n\n  ```js\n  findUser().then(function (user) {\n    return user.name;\n  }, function (reason) {\n    return 'default name';\n  }).then(function (userName) {\n    // If `findUser` fulfilled, `userName` will be the user's name, otherwise it\n    // will be `'default name'`\n  });\n\n  findUser().then(function (user) {\n    throw new Error('Found user, but still unhappy');\n  }, function (reason) {\n    throw new Error('`findUser` rejected and we're unhappy');\n  }).then(function (value) {\n    // never reached\n  }, function (reason) {\n    // if `findUser` fulfilled, `reason` will be 'Found user, but still unhappy'.\n    // If `findUser` rejected, `reason` will be '`findUser` rejected and we're unhappy'.\n  });\n  ```\n  If the downstream promise does not specify a rejection handler, rejection reasons will be propagated further downstream.\n\n  ```js\n  findUser().then(function (user) {\n    throw new PedagogicalException('Upstream error');\n  }).then(function (value) {\n    // never reached\n  }).then(function (value) {\n    // never reached\n  }, function (reason) {\n    // The `PedgagocialException` is propagated all the way down to here\n  });\n  ```\n\n  Assimilation\n  ------------\n\n  Sometimes the value you want to propagate to a downstream promise can only be\n  retrieved asynchronously. This can be achieved by returning a promise in the\n  fulfillment or rejection handler. The downstream promise will then be pending\n  until the returned promise is settled. This is called *assimilation*.\n\n  ```js\n  findUser().then(function (user) {\n    return findCommentsByAuthor(user);\n  }).then(function (comments) {\n    // The user's comments are now available\n  });\n  ```\n\n  If the assimliated promise rejects, then the downstream promise will also reject.\n\n  ```js\n  findUser().then(function (user) {\n    return findCommentsByAuthor(user);\n  }).then(function (comments) {\n    // If `findCommentsByAuthor` fulfills, we'll have the value here\n  }, function (reason) {\n    // If `findCommentsByAuthor` rejects, we'll have the reason here\n  });\n  ```\n\n  Simple Example\n  --------------\n\n  Synchronous Example\n\n  ```javascript\n  let result;\n\n  try {\n    result = findResult();\n    // success\n  } catch(reason) {\n    // failure\n  }\n  ```\n\n  Errback Example\n\n  ```js\n  findResult(function(result, err){\n    if (err) {\n      // failure\n    } else {\n      // success\n    }\n  });\n  ```\n\n  Promise Example;\n\n  ```javascript\n  findResult().then(function(result){\n    // success\n  }, function(reason){\n    // failure\n  });\n  ```\n\n  Advanced Example\n  --------------\n\n  Synchronous Example\n\n  ```javascript\n  let author, books;\n\n  try {\n    author = findAuthor();\n    books  = findBooksByAuthor(author);\n    // success\n  } catch(reason) {\n    // failure\n  }\n  ```\n\n  Errback Example\n\n  ```js\n\n  function foundBooks(books) {\n\n  }\n\n  function failure(reason) {\n\n  }\n\n  findAuthor(function(author, err){\n    if (err) {\n      failure(err);\n      // failure\n    } else {\n      try {\n        findBoooksByAuthor(author, function(books, err) {\n          if (err) {\n            failure(err);\n          } else {\n            try {\n              foundBooks(books);\n            } catch(reason) {\n              failure(reason);\n            }\n          }\n        });\n      } catch(error) {\n        failure(err);\n      }\n      // success\n    }\n  });\n  ```\n\n  Promise Example;\n\n  ```javascript\n  findAuthor().\n    then(findBooksByAuthor).\n    then(function(books){\n      // found books\n  }).catch(function(reason){\n    // something went wrong\n  });\n  ```\n\n  @method then\n  @param {Function} onFulfilled\n  @param {Function} onRejected\n  Useful for tooling.\n  @return {Promise}\n  */\n\n    /**\n  `catch` is simply sugar for `then(undefined, onRejection)` which makes it the same\n  as the catch block of a try/catch statement.\n\n  ```js\n  function findAuthor(){\n    throw new Error('couldn't find that author');\n  }\n\n  // synchronous\n  try {\n    findAuthor();\n  } catch(reason) {\n    // something went wrong\n  }\n\n  // async with promises\n  findAuthor().catch(function(reason){\n    // something went wrong\n  });\n  ```\n\n  @method catch\n  @param {Function} onRejection\n  Useful for tooling.\n  @return {Promise}\n  */\n  catch(onRejection) {\n    return this.then(null, onRejection);\n  }\n\n/**\n  `finally` will be invoked regardless of the promise's fate just as native\n  try/catch/finally behaves\n\n  Synchronous example:\n\n  ```js\n  findAuthor() {\n    if (Math.random() > 0.5) {\n      throw new Error();\n    }\n    return new Author();\n  }\n\n  try {\n    return findAuthor(); // succeed or fail\n  } catch(error) {\n    return findOtherAuther();\n  } finally {\n    // always runs\n    // doesn't affect the return value\n  }\n  ```\n\n  Asynchronous example:\n\n  ```js\n  findAuthor().catch(function(reason){\n    return findOtherAuther();\n  }).finally(function(){\n    // author was either found, or not\n  });\n  ```\n\n  @method finally\n  @param {Function} callback\n  @return {Promise}\n*/\n  finally(callback) {\n    let promise = this;\n    let constructor = promise.constructor;\n\n    return promise.then(value => constructor.resolve(callback()).then(() => value),\n                       reason => constructor.resolve(callback()).then(() => { throw reason; }));\n  }\n}\n\nPromise.prototype.then = then;\nexport default Promise;\nPromise.all = all;\nPromise.race = race;\nPromise.resolve = Resolve;\nPromise.reject = Reject;\nPromise._setScheduler = setScheduler;\nPromise._setAsap = setAsap;\nPromise._asap = asap;\n\n","/*global self*/\nimport Promise from './promise';\n\nexport default function polyfill() {\n  let local;\n\n  if (typeof global !== 'undefined') {\n    local = global;\n  } else if (typeof self !== 'undefined') {\n    local = self;\n  } else {\n    try {\n      local = Function('return this')();\n    } catch (e) {\n      throw new Error('polyfill failed because global object is unavailable in this environment');\n    }\n  }\n\n  let P = local.Promise;\n\n  if (P) {\n    var promiseToString = null;\n    try {\n      promiseToString = Object.prototype.toString.call(P.resolve());\n    } catch(e) {\n      // silently ignored\n    }\n\n    if (promiseToString === '[object Promise]' && !P.cast){\n      return;\n    }\n  }\n\n  local.Promise = Promise;\n}\n","import Promise from './es6-promise/promise';\nimport polyfill from './es6-promise/polyfill';\n\n// Strange compat..\nPromise.polyfill = polyfill;\nPromise.Promise = Promise;\nexport default Promise;\n","import Promise from './es6-promise';\nPromise.polyfill();\nexport default Promise;\n","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n'use strict';\n\n// Establish scope.\nwindow['WebComponents'] = window['WebComponents'] || {'flags':{}};\n\n// loading script\nlet file = 'webcomponents-lite.js';\nlet script = document.querySelector('script[src*=\"' + file + '\"]');\nlet flagMatcher = /wc-(.+)/;\n\n// Flags. Convert url arguments to flags\nlet flags = {};\nif (!flags['noOpts']) {\n  // from url\n  location.search.slice(1).split('&').forEach(function(option) {\n    let parts = option.split('=');\n    let match;\n    if (parts[0] && (match = parts[0].match(flagMatcher))) {\n      flags[match[1]] = parts[1] || true;\n    }\n  });\n  // from script\n  if (script) {\n    for (let i=0, a; (a=script.attributes[i]); i++) {\n      if (a.name !== 'src') {\n        flags[a.name] = a.value || true;\n      }\n    }\n  }\n  // log flags\n  if (flags['log'] && flags['log']['split']) {\n    let parts = flags['log'].split(',');\n    flags['log'] = {};\n    parts.forEach(function(f) {\n      flags['log'][f] = true;\n    });\n  } else {\n    flags['log'] = {};\n  }\n}\n\n// exports\nwindow['WebComponents']['flags'] = flags;\nlet forceShady = flags['shadydom'];\nif (forceShady) {\n  window['ShadyDOM'] = window['ShadyDOM'] || {};\n  window['ShadyDOM']['force'] = forceShady;\n}\n\nlet forceCE = flags['register'] || flags['ce'];\nif (forceCE && window['customElements']) {\n  window['customElements']['forcePolyfill'] = forceCE;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let settings = window['ShadyDOM'] || {};\n\nsettings.hasNativeShadowDOM = Boolean(Element.prototype.attachShadow && Node.prototype.getRootNode);\n\nlet desc = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild');\n\nsettings.hasDescriptors = Boolean(desc && desc.configurable && desc.get);\nsettings.inUse = settings['force'] || !settings.hasNativeShadowDOM;\n\nexport function isTrackingLogicalChildNodes(node) {\n  return (node.__shady && node.__shady.firstChild !== undefined);\n}\n\nexport function isShadyRoot(obj) {\n  return Boolean(obj.__localName === 'ShadyRoot');\n}\n\nexport function ownerShadyRootForNode(node) {\n  let root = node.getRootNode();\n  if (isShadyRoot(root)) {\n    return root;\n  }\n}\n\nlet p = Element.prototype;\nlet matches = p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\n  p.oMatchesSelector || p.webkitMatchesSelector;\n\nexport function matchesSelector(element, selector) {\n  return matches.call(element, selector);\n}\n\nfunction copyOwnProperty(name, source, target) {\n  let pd = Object.getOwnPropertyDescriptor(source, name);\n  if (pd) {\n    Object.defineProperty(target, name, pd);\n  }\n}\n\nexport function extend(target, source) {\n  if (target && source) {\n    let n$ = Object.getOwnPropertyNames(source);\n    for (let i=0, n; (i<n$.length) && (n=n$[i]); i++) {\n      copyOwnProperty(n, source, target);\n    }\n  }\n  return target || source;\n}\n\nexport function extendAll(target, ...sources) {\n  for (let i=0; i < sources.length; i++) {\n    extend(target, sources[i]);\n  }\n  return target;\n}\n\nexport function mixin(target, source) {\n  for (var i in source) {\n    target[i] = source[i];\n  }\n  return target;\n}\n\nexport function patchPrototype(obj, mixin) {\n  let proto = Object.getPrototypeOf(obj);\n  if (!proto.hasOwnProperty('__patchProto')) {\n    let patchProto = Object.create(proto);\n    patchProto.__sourceProto = proto;\n    extend(patchProto, mixin);\n    proto['__patchProto'] = patchProto;\n  }\n  // old browsers don't have setPrototypeOf\n  obj.__proto__ = proto['__patchProto'];\n}\n\n\nlet twiddle = document.createTextNode('');\nlet content = 0;\nlet queue = [];\nnew MutationObserver(() => {\n  while (queue.length) {\n    // catch errors in user code...\n    try {\n      queue.shift()();\n    } catch(e) {\n      // enqueue another record and throw\n      twiddle.textContent = content++;\n      throw(e);\n    }\n  }\n}).observe(twiddle, {characterData: true});\n\n// use MutationObserver to get microtask async timing.\nexport function microtask(callback) {\n  queue.push(callback);\n  twiddle.textContent = content++;\n}\n\nexport const hasDocumentContains = Boolean(document.contains);\n\nexport function contains(container, node) {\n  while (node) {\n    if (node == container) {\n      return true;\n    }\n    node = node.parentNode;\n  }\n  return false;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\n// render enqueuer/flusher\nlet flushList = [];\nlet scheduled;\nexport function enqueue(callback) {\n  if (!scheduled) {\n    scheduled = true;\n    utils.microtask(flush);\n  }\n  flushList.push(callback);\n}\n\nexport function flush() {\n  scheduled = false;\n  let didFlush = Boolean(flushList.length);\n  while (flushList.length) {\n    flushList.shift()();\n  }\n  return didFlush;\n}\n\nflush['list'] = flushList;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\nclass AsyncObserver {\n\n  constructor() {\n    this._scheduled = false;\n    this.addedNodes = [];\n    this.removedNodes = [];\n    this.callbacks = new Set();\n  }\n\n  schedule() {\n    if (!this._scheduled) {\n      this._scheduled = true;\n      utils.microtask(() => {\n        this.flush();\n      });\n    }\n  }\n\n  flush() {\n    if (this._scheduled) {\n      this._scheduled = false;\n      let mutations = this.takeRecords();\n      if (mutations.length) {\n        this.callbacks.forEach(function(cb) {\n          cb(mutations);\n        });\n      }\n    }\n  }\n\n  takeRecords() {\n    if (this.addedNodes.length || this.removedNodes.length) {\n      let mutations = [{\n        addedNodes: this.addedNodes,\n        removedNodes: this.removedNodes\n      }];\n      this.addedNodes = [];\n      this.removedNodes = [];\n      return mutations;\n    }\n    return [];\n  }\n\n}\n\n// TODO(sorvell): consider instead polyfilling MutationObserver\n// directly so that users do not have to fork their code.\n// Supporting the entire api may be challenging: e.g. filtering out\n// removed nodes in the wrong scope and seeing non-distributing\n// subtree child mutations.\nexport let observeChildren = function(node, callback) {\n  node.__shady = node.__shady || {};\n  if (!node.__shady.observer) {\n    node.__shady.observer = new AsyncObserver();\n  }\n  node.__shady.observer.callbacks.add(callback);\n  let observer = node.__shady.observer;\n  return {\n    _callback: callback,\n    _observer: observer,\n    _node: node,\n    takeRecords() {\n      return observer.takeRecords()\n    }\n  };\n}\n\nexport let unobserveChildren = function(handle) {\n  let observer = handle && handle._observer;\n  if (observer) {\n    observer.callbacks.delete(handle._callback);\n    if (!observer.callbacks.size) {\n      handle._node.__shady.observer = null;\n    }\n  }\n}\n\nexport function filterMutations(mutations, target) {\n  /** @const {Node} */\n  const targetRootNode = target.getRootNode();\n  return mutations.map(function(mutation) {\n    /** @const {boolean} */\n    const mutationInScope = (targetRootNode === mutation.target.getRootNode());\n    if (mutationInScope && mutation.addedNodes) {\n      let nodes = Array.from(mutation.addedNodes).filter(function(n) {\n        return (targetRootNode === n.getRootNode());\n      });\n      if (nodes.length) {\n        mutation = Object.create(mutation);\n        Object.defineProperty(mutation, 'addedNodes', {\n          value: nodes,\n          configurable: true\n        });\n        return mutation;\n      }\n    } else if (mutationInScope) {\n      return mutation;\n    }\n  }).filter(function(m) { return m});\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let appendChild = Element.prototype.appendChild;\nexport let insertBefore = Element.prototype.insertBefore;\nexport let removeChild = Element.prototype.removeChild;\nexport let setAttribute = Element.prototype.setAttribute;\nexport let removeAttribute = Element.prototype.removeAttribute;\nexport let cloneNode = Element.prototype.cloneNode;\nexport let importNode = Document.prototype.importNode;\nexport let addEventListener = Element.prototype.addEventListener;\nexport let removeEventListener = Element.prototype.removeEventListener;\nexport let windowAddEventListener = Window.prototype.addEventListener;\nexport let windowRemoveEventListener = Window.prototype.removeEventListener;\nexport let dispatchEvent = Element.prototype.dispatchEvent;\nexport let querySelector = Element.prototype.querySelector;\nexport let querySelectorAll = Element.prototype.querySelectorAll;\nexport let contains = Node.prototype.contains || HTMLElement.prototype.contains;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n// Cribbed from ShadowDOM polyfill\n// https://github.com/webcomponents/webcomponentsjs/blob/master/src/ShadowDOM/wrappers/HTMLElement.js#L28\n/////////////////////////////////////////////////////////////////////////////\n// innerHTML and outerHTML\n\n// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString\nlet escapeAttrRegExp = /[&\\u00A0\"]/g;\nlet escapeDataRegExp = /[&\\u00A0<>]/g;\n\nfunction escapeReplace(c) {\n  switch (c) {\n    case '&':\n      return '&amp;';\n    case '<':\n      return '&lt;';\n    case '>':\n      return '&gt;';\n    case '\"':\n      return '&quot;';\n    case '\\u00A0':\n      return '&nbsp;';\n  }\n}\n\nfunction escapeAttr(s) {\n  return s.replace(escapeAttrRegExp, escapeReplace);\n}\n\nfunction escapeData(s) {\n  return s.replace(escapeDataRegExp, escapeReplace);\n}\n\nfunction makeSet(arr) {\n  let set = {};\n  for (let i = 0; i < arr.length; i++) {\n    set[arr[i]] = true;\n  }\n  return set;\n}\n\n// http://www.whatwg.org/specs/web-apps/current-work/#void-elements\nlet voidElements = makeSet([\n  'area',\n  'base',\n  'br',\n  'col',\n  'command',\n  'embed',\n  'hr',\n  'img',\n  'input',\n  'keygen',\n  'link',\n  'meta',\n  'param',\n  'source',\n  'track',\n  'wbr'\n]);\n\nlet plaintextParents = makeSet([\n  'style',\n  'script',\n  'xmp',\n  'iframe',\n  'noembed',\n  'noframes',\n  'plaintext',\n  'noscript'\n]);\n\n/**\n * @param {Node} node\n * @param {Node} parentNode\n * @param {Function=} callback\n */\nexport function getOuterHTML(node, parentNode, callback) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE: {\n      let tagName = node.localName;\n      let s = '<' + tagName;\n      let attrs = node.attributes;\n      for (let i = 0, attr; (attr = attrs[i]); i++) {\n        s += ' ' + attr.name + '=\"' + escapeAttr(attr.value) + '\"';\n      }\n      s += '>';\n      if (voidElements[tagName]) {\n        return s;\n      }\n      return s + getInnerHTML(node, callback) + '</' + tagName + '>';\n    }\n    case Node.TEXT_NODE: {\n      let data = /** @type {Text} */ (node).data;\n      if (parentNode && plaintextParents[parentNode.localName]) {\n        return data;\n      }\n      return escapeData(data);\n    }\n    case Node.COMMENT_NODE: {\n      return '<!--' + /** @type {Comment} */ (node).data + '-->';\n    }\n    default: {\n      window.console.error(node);\n      throw new Error('not implemented');\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Function=} callback\n */\nexport function getInnerHTML(node, callback) {\n  if (node.localName === 'template') {\n    node =  /** @type {HTMLTemplateElement} */ (node).content;\n  }\n  let s = '';\n  let c$ = callback ? callback(node) : node.childNodes;\n  for (let i=0, l=c$.length, child; (i<l) && (child=c$[i]); i++) {\n    s += getOuterHTML(child, node, callback);\n  }\n  return s;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {getInnerHTML} from './innerHTML.js';\n\nlet nodeWalker = document.createTreeWalker(document, NodeFilter.SHOW_ALL,\n  null, false);\n\nlet elementWalker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT,\n  null, false);\n\nexport function parentNode(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.parentNode();\n}\n\nexport function firstChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.firstChild();\n}\n\nexport function lastChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.lastChild();\n}\n\nexport function previousSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.previousSibling();\n}\n\nexport function nextSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.nextSibling();\n}\n\nexport function childNodes(node) {\n  let nodes = [];\n  nodeWalker.currentNode = node;\n  let n = nodeWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = nodeWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function parentElement(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.parentNode();\n}\n\nexport function firstElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.firstChild();\n}\n\nexport function lastElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.lastChild();\n}\n\nexport function previousElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.previousSibling();\n}\n\nexport function nextElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.nextSibling();\n}\n\nexport function children(node) {\n  let nodes = [];\n  elementWalker.currentNode = node;\n  let n = elementWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = elementWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function innerHTML(node) {\n  return getInnerHTML(node, (n) => childNodes(n));\n}\n\nexport function textContent(node) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE:\n    case Node.DOCUMENT_FRAGMENT_NODE:\n      let textWalker = document.createTreeWalker(node, NodeFilter.SHOW_TEXT,\n        null, false);\n      let content = '', n;\n      while ( (n = textWalker.nextNode()) ) {\n        // TODO(sorvell): can't use textContent since we patch it on Node.prototype!\n        // However, should probably patch it only on element.\n        content += n.nodeValue;\n      }\n      return content;\n    default:\n      return node.nodeValue;\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {getInnerHTML} from './innerHTML.js';\nimport * as nativeTree from './native-tree.js';\nimport {contains as nativeContains} from './native-methods.js';\n\nfunction clearNode(node) {\n  while (node.firstChild) {\n    node.removeChild(node.firstChild);\n  }\n}\n\nconst nativeInnerHTMLDesc = /** @type {ObjectPropertyDescriptor} */(\n  Object.getOwnPropertyDescriptor(Element.prototype, 'innerHTML') ||\n  Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerHTML'));\n\nconst inertDoc = document.implementation.createHTMLDocument('inert');\n\nconst nativeActiveElementDescriptor =\n  /** @type {ObjectPropertyDescriptor} */(\n    Object.getOwnPropertyDescriptor(Document.prototype, 'activeElement')\n  );\nfunction getDocumentActiveElement() {\n  if (nativeActiveElementDescriptor && nativeActiveElementDescriptor.get) {\n    return nativeActiveElementDescriptor.get.call(document);\n  } else if (!utils.settings.hasDescriptors) {\n    return document.activeElement;\n  }\n}\n\nfunction activeElementForNode(node) {\n  let active = getDocumentActiveElement();\n  // In IE11, activeElement might be an empty object if the document is\n  // contained in an iframe.\n  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10998788/\n  if (!active || !active.nodeType) {\n    return null;\n  }\n  let isShadyRoot = !!(utils.isShadyRoot(node));\n  if (node !== document) {\n    // If this node isn't a document or shady root, then it doesn't have\n    // an active element.\n    if (!isShadyRoot) {\n      return null;\n    }\n    // If this shady root's host is the active element or the active\n    // element is not a descendant of the host (in the composed tree),\n    // then it doesn't have an active element.\n    if (node.host === active ||\n        !nativeContains.call(node.host, active)) {\n      return null;\n    }\n  }\n  // This node is either the document or a shady root of which the active\n  // element is a (composed) descendant of its host; iterate upwards to\n  // find the active element's most shallow host within it.\n  let activeRoot = utils.ownerShadyRootForNode(active);\n  while (activeRoot && activeRoot !== node) {\n    active = activeRoot.host;\n    activeRoot = utils.ownerShadyRootForNode(active);\n  }\n  if (node === document) {\n    // This node is the document, so activeRoot should be null.\n    return activeRoot ? null : active;\n  } else {\n    // This node is a non-document shady root, and it should be\n    // activeRoot.\n    return activeRoot === node ? active : null;\n  }\n}\n\nlet OutsideAccessors = {\n\n  parentElement: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      if (l && l.nodeType !== Node.ELEMENT_NODE) {\n        l = null;\n      }\n      return l !== undefined ? l : nativeTree.parentElement(this);\n    },\n    configurable: true\n  },\n\n  parentNode: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      return l !== undefined ? l : nativeTree.parentNode(this);\n    },\n    configurable: true\n  },\n\n  nextSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.nextSibling;\n      return l !== undefined ? l : nativeTree.nextSibling(this);\n    },\n    configurable: true\n  },\n\n  previousSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.previousSibling;\n      return l !== undefined ? l : nativeTree.previousSibling(this);\n    },\n    configurable: true\n  },\n\n  className: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.getAttribute('class') || '';\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(value) {\n      this.setAttribute('class', value);\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  nextElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.nextSibling !== undefined) {\n        let n = this.nextSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.nextElementSibling(this);\n      }\n    },\n    configurable: true\n  },\n\n  previousElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.previousSibling !== undefined) {\n        let n = this.previousSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.previousElementSibling(this);\n      }\n    },\n    configurable: true\n  }\n\n};\n\nlet InsideAccessors = {\n\n  childNodes: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let childNodes;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        if (!this.__shady.childNodes) {\n          this.__shady.childNodes = [];\n          for (let n=this.firstChild; n; n=n.nextSibling) {\n            this.__shady.childNodes.push(n);\n          }\n        }\n        childNodes = this.__shady.childNodes;\n      } else {\n        childNodes = nativeTree.childNodes(this);\n      }\n      childNodes.item = function(index) {\n        return childNodes[index];\n      }\n      return childNodes;\n    },\n    configurable: true\n  },\n\n  childElementCount: {\n    /** @this {HTMLElement} */\n    get() {\n      return this.children.length;\n    },\n    configurable: true\n  },\n\n  firstChild: {\n    /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.firstChild;\n      return l !== undefined ? l : nativeTree.firstChild(this);\n    },\n    configurable: true\n  },\n\n  lastChild: {\n  /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.lastChild;\n      return l !== undefined ? l : nativeTree.lastChild(this);\n    },\n    configurable: true\n  },\n\n  textContent: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        let tc = [];\n        for (let i = 0, cn = this.childNodes, c; (c = cn[i]); i++) {\n          if (c.nodeType !== Node.COMMENT_NODE) {\n            tc.push(c.textContent);\n          }\n        }\n        return tc.join('');\n      } else {\n        return nativeTree.textContent(this);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     * @param {string} text\n     */\n    set(text) {\n      if (typeof text === 'undefined' || text === null) {\n        text = ''\n      }\n      switch (this.nodeType) {\n        case Node.ELEMENT_NODE:\n        case Node.DOCUMENT_FRAGMENT_NODE:\n          clearNode(this);\n          // Document fragments must have no childnodes if setting a blank string\n          if (text.length > 0 || this.nodeType === Node.ELEMENT_NODE) {\n            this.appendChild(document.createTextNode(text));\n          }\n          break;\n        default:\n          // TODO(sorvell): can't do this if patch nodeValue.\n          this.nodeValue = text;\n          break;\n      }\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  firstElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.firstChild !== undefined) {\n        let n = this.firstChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.firstElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  lastElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.lastChild !== undefined) {\n        let n = this.lastChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.lastElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  children: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let children;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        children = Array.prototype.filter.call(this.childNodes, function(n) {\n          return (n.nodeType === Node.ELEMENT_NODE);\n        });\n      } else {\n        children = nativeTree.children(this);\n      }\n      children.item = function(index) {\n        return children[index];\n      }\n      return children;\n    },\n    configurable: true\n  },\n\n  // element (HTMLElement on IE11)\n  innerHTML: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      const content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        return getInnerHTML(content);\n      } else {\n        return nativeTree.innerHTML(content);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(text) {\n      const content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      clearNode(content);\n      let containerName = this.localName;\n      if (!containerName || containerName === 'template') {\n        containerName = 'div';\n      }\n      const htmlContainer = inertDoc.createElement(containerName);\n      if (nativeInnerHTMLDesc && nativeInnerHTMLDesc.set) {\n        nativeInnerHTMLDesc.set.call(htmlContainer, text);\n      } else {\n        htmlContainer.innerHTML = text;\n      }\n      while (htmlContainer.firstChild) {\n        content.appendChild(htmlContainer.firstChild);\n      }\n    },\n    configurable: true\n  }\n\n};\n\n// Note: Can be patched on element prototype on all browsers.\n// Must be patched on instance on browsers that support native Shadow DOM\n// but do not have builtin accessors (old Chrome).\nexport let ShadowRootAccessor = {\n\n  shadowRoot: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.__shady && this.__shady.publicRoot || null;\n    },\n    configurable: true\n  }\n};\n\n// Note: Can be patched on document prototype on browsers with builtin accessors.\n// Must be patched separately on simulated ShadowRoot.\n// Must be patched as `_activeElement` on browsers without builtin accessors.\nexport let ActiveElementAccessor = {\n\n  activeElement: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return activeElementForNode(this);\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set() {},\n    configurable: true\n  }\n\n};\n\n// patch a group of descriptors on an object only if it exists or if the `force`\n// argument is true.\n/**\n * @param {!Object} obj\n * @param {!Object} descriptors\n * @param {boolean=} force\n */\nfunction patchAccessorGroup(obj, descriptors, force) {\n  for (let p in descriptors) {\n    let objDesc = Object.getOwnPropertyDescriptor(obj, p);\n    if ((objDesc && objDesc.configurable) ||\n      (!objDesc && force)) {\n      Object.defineProperty(obj, p, descriptors[p]);\n    } else if (force) {\n      console.warn('Could not define', p, 'on', obj);\n    }\n  }\n}\n\n// patch dom accessors on proto where they exist\nexport function patchAccessors(proto) {\n  patchAccessorGroup(proto, OutsideAccessors);\n  patchAccessorGroup(proto, InsideAccessors);\n  patchAccessorGroup(proto, ActiveElementAccessor);\n}\n\n// ensure element descriptors (IE/Edge don't have em)\nexport function patchShadowRootAccessors(proto) {\n  patchAccessorGroup(proto, InsideAccessors, true);\n  patchAccessorGroup(proto, ActiveElementAccessor, true);\n}\n\n// ensure an element has patched \"outside\" accessors; no-op when not needed\nexport let patchOutsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__outsideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__outsideAccessors = true;\n      patchAccessorGroup(element, OutsideAccessors, true);\n    }\n  }\n\n// ensure an element has patched \"inside\" accessors; no-op when not needed\nexport let patchInsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__insideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__insideAccessors = true;\n      patchAccessorGroup(element, InsideAccessors, true);\n      patchAccessorGroup(element, ShadowRootAccessor, true);\n    }\n  }\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-accessors.js';\nimport {firstChild, lastChild, childNodes} from './native-tree.js';\n\nexport function recordInsertBefore(node, container, ref_node) {\n  patchInsideElementAccessors(container);\n  container.__shady = container.__shady || {};\n  if (container.__shady.firstChild !== undefined) {\n    container.__shady.childNodes = null;\n  }\n  // handle document fragments\n  if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n    let c$ = node.childNodes;\n    for (let i=0; i < c$.length; i++) {\n      linkNode(c$[i], container, ref_node);\n    }\n    // cleanup logical dom in doc fragment.\n    node.__shady = node.__shady || {};\n    let resetTo = (node.__shady.firstChild !== undefined) ? null : undefined;\n    node.__shady.firstChild = node.__shady.lastChild = resetTo;\n    node.__shady.childNodes = resetTo;\n  } else {\n    linkNode(node, container, ref_node);\n  }\n}\n\nfunction linkNode(node, container, ref_node) {\n  patchOutsideElementAccessors(node);\n  ref_node = ref_node || null;\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (ref_node) {\n    ref_node.__shady = ref_node.__shady || {};\n  }\n  // update ref_node.previousSibling <-> node\n  node.__shady.previousSibling = ref_node ? ref_node.__shady.previousSibling :\n    container.lastChild;\n  let ps = node.__shady.previousSibling;\n  if (ps && ps.__shady) {\n    ps.__shady.nextSibling = node;\n  }\n  // update node <-> ref_node\n  let ns = node.__shady.nextSibling = ref_node;\n  if (ns && ns.__shady) {\n    ns.__shady.previousSibling = node;\n  }\n  // update node <-> container\n  node.__shady.parentNode = container;\n  if (ref_node) {\n    if (ref_node === container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  } else {\n    container.__shady.lastChild = node;\n    if (!container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  }\n  // remove caching of childNodes\n  container.__shady.childNodes = null;\n}\n\nexport function recordRemoveChild(node, container) {\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (node === container.__shady.firstChild) {\n    container.__shady.firstChild = node.__shady.nextSibling;\n  }\n  if (node === container.__shady.lastChild) {\n    container.__shady.lastChild = node.__shady.previousSibling;\n  }\n  let p = node.__shady.previousSibling;\n  let n = node.__shady.nextSibling;\n  if (p) {\n    p.__shady = p.__shady || {};\n    p.__shady.nextSibling = n;\n  }\n  if (n) {\n    n.__shady = n.__shady || {};\n    n.__shady.previousSibling = p;\n  }\n  // When an element is removed, logical data is no longer tracked.\n  // Explicitly set `undefined` here to indicate this. This is disginguished\n  // from `null` which is set if info is null.\n  node.__shady.parentNode = node.__shady.previousSibling =\n    node.__shady.nextSibling = undefined;\n  if (container.__shady.childNodes !== undefined) {\n    // remove caching of childNodes\n    container.__shady.childNodes = null;\n  }\n}\n\nexport let recordChildNodes = function(node) {\n  if (!node.__shady || node.__shady.firstChild === undefined) {\n    node.__shady = node.__shady || {};\n    node.__shady.firstChild = firstChild(node);\n    node.__shady.lastChild = lastChild(node);\n    patchInsideElementAccessors(node);\n    let c$ = node.__shady.childNodes = childNodes(node);\n    for (let i=0, n; (i<c$.length) && (n=c$[i]); i++) {\n      n.__shady = n.__shady || {};\n      n.__shady.parentNode = node;\n      n.__shady.nextSibling = c$[i+1] || null;\n      n.__shady.previousSibling = c$[i-1] || null;\n      patchOutsideElementAccessors(n);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as logicalTree from './logical-tree.js';\nimport * as nativeMethods from './native-methods.js';\nimport {parentNode} from './native-tree.js';\n\n// Patched `insertBefore`. Note that all mutations that add nodes are routed\n// here. When a <slot> is added or a node is added to a host with a shadowRoot\n// with a slot, a standard dom `insert` call is aborted and `_asyncRender`\n// is called on the relevant shadowRoot. In all other cases, a standard dom\n// `insert` can be made, but the location and ref_node may need to be changed.\n/**\n * @param {Node} parent\n * @param {Node} node\n * @param {Node=} ref_node\n */\nexport function insertBefore(parent, node, ref_node) {\n  if (node === parent) {\n    throw Error(`Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`);\n  }\n  if (ref_node) {\n    let p = ref_node.__shady && ref_node.__shady.parentNode;\n    if ((p !== undefined && p !== parent) ||\n      (p === undefined && parentNode(ref_node) !== parent)) {\n      throw Error(`Failed to execute 'insertBefore' on 'Node': The node ` +\n       `before which the new node is to be inserted is not a child of this node.`);\n    }\n  }\n  if (ref_node === node) {\n    return node;\n  }\n  // remove from existing location\n  if (node.parentNode) {\n    // NOTE: avoid node.removeChild as this *can* trigger another patched\n    // method (e.g. custom elements) and we want only the shady method to run.\n    removeChild(node.parentNode, node);\n  }\n  // add to new parent\n  let preventNativeInsert;\n  let ownerRoot = utils.ownerShadyRootForNode(parent);\n  // if a slot is added, must render containing root.\n  let slotsAdded = ownerRoot && findContainedSlots(node);\n  if (slotsAdded) {\n    ownerRoot._addSlots(slotsAdded);\n  }\n  if (ownerRoot && (parent.localName === 'slot' || slotsAdded)) {\n    ownerRoot._asyncRender();\n  }\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordInsertBefore(node, parent, ref_node);\n    // when inserting into a host with a shadowRoot with slot, use\n    // `shadowRoot._asyncRender()` via `attach-shadow` module\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeInsert = true;\n    // when inserting into a host with shadowRoot with NO slot, do nothing\n    // as the node should not be added to composed dome anywhere.\n    } else if (parent.__shady.root) {\n      preventNativeInsert = true;\n    }\n  }\n  if (!preventNativeInsert) {\n    // if adding to a shadyRoot, add to host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host : parent;\n    // if ref_node, get the ref_node that's actually in composed dom.\n    if (ref_node) {\n      ref_node = firstComposedNode(ref_node);\n      nativeMethods.insertBefore.call(container, node, ref_node);\n    } else {\n      nativeMethods.appendChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, node);\n  return node;\n}\n\nfunction findContainedSlots(node) {\n  if (!node['__noInsertionPoint']) {\n    let slots;\n    if (node.localName === 'slot') {\n      slots = [node];\n    } else if (node.querySelectorAll) {\n      slots = node.querySelectorAll('slot');\n    }\n    if (slots && slots.length) {\n      return slots;\n    }\n  }\n}\n\n/**\n * Patched `removeChild`. Note that all dom \"removals\" are routed here.\n * Removes the given `node` from the element's `children`.\n * This method also performs dom composition.\n * @param {Node} parent\n * @param {Node} node\n*/\nexport function removeChild(parent, node) {\n  if (node.parentNode !== parent) {\n    throw Error('The node to be removed is not a child of this node: ' +\n      node);\n  }\n  let preventNativeRemove;\n  let ownerRoot = utils.ownerShadyRootForNode(node);\n  let removingInsertionPoint;\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordRemoveChild(node, parent);\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeRemove = true;\n    }\n  }\n  removeOwnerShadyRoot(node);\n  // if removing slot, must render containing root\n  if (ownerRoot) {\n    let changeSlotContent = parent && parent.localName === 'slot';\n    if (changeSlotContent) {\n      preventNativeRemove = true;\n    }\n    removingInsertionPoint = ownerRoot._removeContainedSlots(node);\n    if (removingInsertionPoint || changeSlotContent) {\n      ownerRoot._asyncRender();\n    }\n  }\n  if (!preventNativeRemove) {\n    // if removing from a shadyRoot, remove form host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host :\n      parent;\n    // not guaranteed to physically be in container; e.g.\n    // (1) if parent has a shadyRoot, element may or may not at distributed\n    // location (could be undistributed)\n    // (2) if parent is a slot, element may not ben in composed dom\n    if (!(parent.__shady.root || node.localName === 'slot') ||\n      (container === parentNode(node))) {\n      nativeMethods.removeChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, null, node);\n  return node;\n}\n\nfunction removeOwnerShadyRoot(node) {\n  // optimization: only reset the tree if node is actually in a root\n  if (hasCachedOwnerRoot(node)) {\n    let c$ = node.childNodes;\n    for (let i=0, l=c$.length, n; (i<l) && (n=c$[i]); i++) {\n      removeOwnerShadyRoot(n);\n    }\n  }\n  if (node.__shady) {\n    node.__shady.ownerShadyRoot = undefined;\n  }\n}\n\nfunction hasCachedOwnerRoot(node) {\n  return Boolean(node.__shady && node.__shady.ownerShadyRoot !== undefined);\n}\n\n/**\n * Finds the first flattened node that is composed in the node's parent.\n * If the given node is a slot, then the first flattened node is returned\n * if it exists, otherwise advance to the node's nextSibling.\n * @param {Node} node within which to find first composed node\n * @returns {Node} first composed node\n */\nfunction firstComposedNode(node) {\n  let composed = node;\n  if (node && node.localName === 'slot') {\n    let flattened = node.__shady && node.__shady.flattenedNodes;\n    composed = flattened && flattened.length ? flattened[0] :\n      firstComposedNode(node.nextSibling);\n  }\n  return composed;\n}\n\nfunction hasShadowRootWithSlot(node) {\n  let root = node && node.__shady && node.__shady.root;\n  return (root && root._hasInsertionPoint());\n}\n\n/**\n * Should be called whenever an attribute changes. If the `slot` attribute\n * changes, provokes rendering if necessary. If a `<slot>` element's `name`\n * attribute changes, updates the root's slot map and renders.\n * @param {Node} node\n * @param {string} name\n */\nfunction distributeAttributeChange(node, name) {\n  if (name === 'slot') {\n    const parent = node.parentNode;\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n    }\n  } else if (node.localName === 'slot' && name === 'name') {\n    let root = utils.ownerShadyRootForNode(node);\n    if (root) {\n      root._updateSlotName(node);\n      root._asyncRender();\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Node=} addedNode\n * @param {Node=} removedNode\n */\nfunction scheduleObserver(node, addedNode, removedNode) {\n  let observer = node.__shady && node.__shady.observer;\n  if (observer) {\n    if (addedNode) {\n      observer.addedNodes.push(addedNode);\n    }\n    if (removedNode) {\n      observer.removedNodes.push(removedNode);\n    }\n    observer.schedule();\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Object=} options\n */\nexport function getRootNode(node, options) { // eslint-disable-line no-unused-vars\n  if (!node || !node.nodeType) {\n    return;\n  }\n  node.__shady = node.__shady || {};\n  let root = node.__shady.ownerShadyRoot;\n  if (root === undefined) {\n    if (utils.isShadyRoot(node)) {\n      root = node;\n    } else {\n      let parent = node.parentNode;\n      root = parent ? getRootNode(parent) : node;\n    }\n    // memo-ize result for performance but only memo-ize\n    // result if node is in the document. This avoids a problem where a root\n    // can be cached while an element is inside a fragment.\n    // If this happens and we cache the result, the value can become stale\n    // because for perf we avoid processing the subtree of added fragments.\n    if (nativeMethods.contains.call(document.documentElement, node)) {\n      node.__shady.ownerShadyRoot = root;\n    }\n  }\n  return root;\n}\n\n// NOTE: `query` is used primarily for ShadyDOM's querySelector impl,\n// but it's also generally useful to recurse through the element tree\n// and is used by Polymer's styling system.\n/**\n * @param {Node} node\n * @param {Function} matcher\n * @param {Function=} halter\n */\nexport function query(node, matcher, halter) {\n  let list = [];\n  queryElements(node.childNodes, matcher,\n    halter, list);\n  return list;\n}\n\nfunction queryElements(elements, matcher, halter, list) {\n  for (let i=0, l=elements.length, c; (i<l) && (c=elements[i]); i++) {\n    if (c.nodeType === Node.ELEMENT_NODE &&\n        queryElement(c, matcher, halter, list)) {\n      return true;\n    }\n  }\n}\n\nfunction queryElement(node, matcher, halter, list) {\n  let result = matcher(node);\n  if (result) {\n    list.push(node);\n  }\n  if (halter && halter(result)) {\n    return result;\n  }\n  queryElements(node.childNodes, matcher,\n    halter, list);\n}\n\nexport function renderRootNode(element) {\n  var root = element.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    root._render();\n  }\n}\n\nlet scopingShim = null;\n\nexport function setAttribute(node, attr, value) {\n  if (!scopingShim) {\n    scopingShim = window['ShadyCSS'] && window['ShadyCSS']['ScopingShim'];\n  }\n  if (scopingShim && attr === 'class') {\n    scopingShim['setElementClass'](node, value);\n  } else {\n    nativeMethods.setAttribute.call(node, attr, value);\n    distributeAttributeChange(node, attr);\n  }\n}\n\nexport function removeAttribute(node, attr) {\n  nativeMethods.removeAttribute.call(node, attr);\n  distributeAttributeChange(node, attr);\n}\n\nexport function cloneNode(node, deep) {\n  if (node.localName == 'template') {\n    return nativeMethods.cloneNode.call(node, deep);\n  } else {\n    let n = nativeMethods.cloneNode.call(node, false);\n    if (deep) {\n      let c$ = node.childNodes;\n      for (let i=0, nc; i < c$.length; i++) {\n        nc = c$[i].cloneNode(true);\n        n.appendChild(nc);\n      }\n    }\n    return n;\n  }\n}\n\n// note: Though not technically correct, we fast path `importNode`\n// when called on a node not owned by the main document.\n// This allows, for example, elements that cannot\n// contain custom elements and are therefore not likely to contain shadowRoots\n// to cloned natively. This is a fairly significant performance win.\nexport function importNode(node, deep) {\n  if (node.ownerDocument !== document) {\n    return nativeMethods.importNode.call(document, node, deep);\n  }\n  let n = nativeMethods.importNode.call(document, node, false);\n  if (deep) {\n    let c$ = node.childNodes;\n    for (let i=0, nc; i < c$.length; i++) {\n      nc = importNode(c$[i], true);\n      n.appendChild(nc);\n    }\n  }\n  return n;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as nativeMethods from './native-methods.js';\n\n/*\nMake this name unique so it is unlikely to conflict with properties on objects passed to `addEventListener`\nhttps://github.com/webcomponents/shadydom/issues/173\n*/\nconst /** string */ eventWrappersName = `__eventWrappers${Date.now()}`;\n\n// https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937\nlet alwaysComposed = {\n  'blur': true,\n  'focus': true,\n  'focusin': true,\n  'focusout': true,\n  'click': true,\n  'dblclick': true,\n  'mousedown': true,\n  'mouseenter': true,\n  'mouseleave': true,\n  'mousemove': true,\n  'mouseout': true,\n  'mouseover': true,\n  'mouseup': true,\n  'wheel': true,\n  'beforeinput': true,\n  'input': true,\n  'keydown': true,\n  'keyup': true,\n  'compositionstart': true,\n  'compositionupdate': true,\n  'compositionend': true,\n  'touchstart': true,\n  'touchend': true,\n  'touchmove': true,\n  'touchcancel': true,\n  'pointerover': true,\n  'pointerenter': true,\n  'pointerdown': true,\n  'pointermove': true,\n  'pointerup': true,\n  'pointercancel': true,\n  'pointerout': true,\n  'pointerleave': true,\n  'gotpointercapture': true,\n  'lostpointercapture': true,\n  'dragstart': true,\n  'drag': true,\n  'dragenter': true,\n  'dragleave': true,\n  'dragover': true,\n  'drop': true,\n  'dragend': true,\n  'DOMActivate': true,\n  'DOMFocusIn': true,\n  'DOMFocusOut': true,\n  'keypress': true\n};\n\nfunction pathComposer(startNode, composed) {\n  let composedPath = [];\n  let current = startNode;\n  let startRoot = startNode === window ? window : startNode.getRootNode();\n  while (current) {\n    composedPath.push(current);\n    if (current.assignedSlot) {\n      current = current.assignedSlot;\n    } else if (current.nodeType === Node.DOCUMENT_FRAGMENT_NODE && current.host && (composed || current !== startRoot)) {\n      current = current.host;\n    } else {\n      current = current.parentNode;\n    }\n  }\n  // event composedPath includes window when startNode's ownerRoot is document\n  if (composedPath[composedPath.length - 1] === document) {\n    composedPath.push(window);\n  }\n  return composedPath;\n}\n\nfunction retarget(refNode, path) {\n  if (!utils.isShadyRoot) {\n    return refNode;\n  }\n  // If ANCESTOR's root is not a shadow root or ANCESTOR's root is BASE's\n  // shadow-including inclusive ancestor, return ANCESTOR.\n  let refNodePath = pathComposer(refNode, true);\n  let p$ = path;\n  for (let i=0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {\n    ancestor = p$[i];\n    root = ancestor === window ? window : ancestor.getRootNode();\n    if (root !== lastRoot) {\n      rootIdx = refNodePath.indexOf(root);\n      lastRoot = root;\n    }\n    if (!utils.isShadyRoot(root) || rootIdx > -1) {\n      return ancestor;\n    }\n  }\n}\n\nlet eventMixin = {\n\n  /**\n   * @this {Event}\n   */\n  get composed() {\n    // isTrusted may not exist in this browser, so just check if isTrusted is explicitly false\n    if (this.isTrusted !== false && this.__composed === undefined) {\n      this.__composed = alwaysComposed[this.type];\n    }\n    return this.__composed || false;\n  },\n\n  /**\n   * @this {Event}\n   */\n  composedPath() {\n    if (!this.__composedPath) {\n      this.__composedPath = pathComposer(this['__target'], this.composed);\n    }\n    return this.__composedPath;\n  },\n\n  /**\n   * @this {Event}\n   */\n  get target() {\n    return retarget(this.currentTarget, this.composedPath());\n  },\n\n  // http://w3c.github.io/webcomponents/spec/shadow/#event-relatedtarget-retargeting\n  /**\n   * @this {Event}\n   */\n  get relatedTarget() {\n    if (!this.__relatedTarget) {\n      return null;\n    }\n    if (!this.__relatedTargetComposedPath) {\n      this.__relatedTargetComposedPath = pathComposer(this.__relatedTarget, true);\n    }\n    // find the deepest node in relatedTarget composed path that is in the same root with the currentTarget\n    return retarget(this.currentTarget, this.__relatedTargetComposedPath);\n  },\n  /**\n   * @this {Event}\n   */\n  stopPropagation() {\n    Event.prototype.stopPropagation.call(this);\n    this.__propagationStopped = true;\n  },\n  /**\n   * @this {Event}\n   */\n  stopImmediatePropagation() {\n    Event.prototype.stopImmediatePropagation.call(this);\n    this.__immediatePropagationStopped = true;\n    this.__propagationStopped = true;\n  }\n\n};\n\nfunction mixinComposedFlag(Base) {\n  // NOTE: avoiding use of `class` here so that transpiled output does not\n  // try to do `Base.call` with a dom construtor.\n  let klazz = function(type, options) {\n    let event = new Base(type, options);\n    event.__composed = options && Boolean(options['composed']);\n    return event;\n  }\n  // put constructor properties on subclass\n  utils.mixin(klazz, Base);\n  klazz.prototype = Base.prototype;\n  return klazz;\n}\n\nlet nonBubblingEventsToRetarget = {\n  'focus': true,\n  'blur': true\n};\n\n\n/**\n * Check if the event has been retargeted by comparing original `target`, and calculated `target`\n * @param {Event} event\n * @return {boolean} True if the original target and calculated target are the same\n */\nfunction hasRetargeted(event) {\n  return event['__target'] !== event.target || event.__relatedTarget !== event.relatedTarget;\n}\n\n/**\n *\n * @param {Event} event\n * @param {Node} node\n * @param {string} phase\n */\nfunction fireHandlers(event, node, phase) {\n  let hs = node.__handlers && node.__handlers[event.type] &&\n    node.__handlers[event.type][phase];\n  if (hs) {\n    for (let i = 0, fn; (fn = hs[i]); i++) {\n      if (hasRetargeted(event) && event.target === event.relatedTarget) {\n        return;\n      }\n      fn.call(node, event);\n      if (event.__immediatePropagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction retargetNonBubblingEvent(e) {\n  let path = e.composedPath();\n  let node;\n  // override `currentTarget` to let patched `target` calculate correctly\n  Object.defineProperty(e, 'currentTarget', {\n    get: function() {\n      return node;\n    },\n    configurable: true\n  });\n  for (let i = path.length - 1; i >= 0; i--) {\n    node = path[i];\n    // capture phase fires all capture handlers\n    fireHandlers(e, node, 'capture');\n    if (e.__propagationStopped) {\n      return;\n    }\n  }\n\n  // set the event phase to `AT_TARGET` as in spec\n  Object.defineProperty(e, 'eventPhase', {get() { return Event.AT_TARGET }});\n\n  // the event only needs to be fired when owner roots change when iterating the event path\n  // keep track of the last seen owner root\n  let lastFiredRoot;\n  for (let i = 0; i < path.length; i++) {\n    node = path[i];\n    const root = node.__shady && node.__shady.root;\n    if (i === 0 || (root && root === lastFiredRoot)) {\n      fireHandlers(e, node, 'bubble');\n      // don't bother with window, it doesn't have `getRootNode` and will be last in the path anyway\n      if (node !== window) {\n        lastFiredRoot = node.getRootNode();\n      }\n      if (e.__propagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction listenerSettingsEqual(savedListener, node, type, capture, once, passive) {\n  let {\n    node: savedNode,\n    type: savedType,\n    capture: savedCapture,\n    once: savedOnce,\n    passive: savedPassive\n  } = savedListener;\n  return node === savedNode &&\n    type === savedType &&\n    capture === savedCapture &&\n    once === savedOnce &&\n    passive === savedPassive;\n}\n\nexport function findListener(wrappers, node, type, capture, once, passive) {\n  for (let i = 0; i < wrappers.length; i++) {\n    if (listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)) {\n      return i;\n    }\n  }\n  return -1;\n}\n\n/**\n * Firefox can throw on accessing eventWrappers inside of `removeEventListener` during a selenium run\n * Try/Catch accessing eventWrappers to work around\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1353074\n */\nfunction getEventWrappers(eventLike) {\n  let wrappers = null;\n  try {\n    wrappers = eventLike[eventWrappersName];\n  } catch (e) {} // eslint-disable-line no-empty\n  return wrappers;\n}\n\n/**\n * @this {Event}\n */\nexport function addEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  const handlerType = typeof fnOrObj;\n\n  // bail if `fnOrObj` is not a function, not an object\n  if (handlerType !== 'function' && handlerType !== 'object') {\n    return;\n  }\n\n  // bail if `fnOrObj` is an object without a `handleEvent` method\n  if (handlerType === 'object' && (!fnOrObj.handleEvent || typeof fnOrObj.handleEvent !== 'function')) {\n    return;\n  }\n\n  // The callback `fn` might be used for multiple nodes/events. Since we generate\n  // a wrapper function, we need to keep track of it when we remove the listener.\n  // It's more efficient to store the node/type/options information as Array in\n  // `fn` itself rather than the node (we assume that the same callback is used\n  // for few nodes at most, whereas a node will likely have many event listeners).\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (optionsOrCapture && typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  // hack to let ShadyRoots have event listeners\n  // event listener will be on host, but `currentTarget`\n  // will be set to shadyroot for event listener\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n\n  let wrappers = fnOrObj[eventWrappersName];\n  if (wrappers) {\n    // Stop if the wrapper function has already been created.\n    if (findListener(wrappers, target, type, capture, once, passive) > -1) {\n      return;\n    }\n  } else {\n    fnOrObj[eventWrappersName] = [];\n  }\n\n  /**\n   * @this {HTMLElement}\n   * @param {Event} e\n   */\n  const wrapperFn = function(e) {\n    // Support `once` option.\n    if (once) {\n      this.removeEventListener(type, fnOrObj, optionsOrCapture);\n    }\n    if (!e['__target']) {\n      patchEvent(e);\n    }\n    let lastCurrentTargetDesc;\n    if (target !== this) {\n      // replace `currentTarget` to make `target` and `relatedTarget` correct for inside the shadowroot\n      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(e, 'currentTarget');\n      Object.defineProperty(e, 'currentTarget', {get() { return target }, configurable: true});\n    }\n    // There are two critera that should stop events from firing on this node\n    // 1. the event is not composed and the current node is not in the same root as the target\n    // 2. when bubbling, if after retargeting, relatedTarget and target point to the same node\n    if (e.composed || e.composedPath().indexOf(target) > -1) {\n      if (hasRetargeted(e) && e.target === e.relatedTarget) {\n        if (e.eventPhase === Event.BUBBLING_PHASE) {\n          e.stopImmediatePropagation();\n        }\n        return;\n      }\n      // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase\n      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target && !(target instanceof Window)) {\n        return;\n      }\n      let ret = handlerType === 'function' ?\n        fnOrObj.call(target, e) :\n        (fnOrObj.handleEvent && fnOrObj.handleEvent(e));\n      if (target !== this) {\n        // replace the \"correct\" `currentTarget`\n        if (lastCurrentTargetDesc) {\n          Object.defineProperty(e, 'currentTarget', lastCurrentTargetDesc);\n          lastCurrentTargetDesc = null;\n        } else {\n          delete e['currentTarget'];\n        }\n      }\n      return ret;\n    }\n  };\n  // Store the wrapper information.\n  fnOrObj[eventWrappersName].push({\n    node: this,\n    type: type,\n    capture: capture,\n    once: once,\n    passive: passive,\n    wrapperFn: wrapperFn\n  });\n\n  if (nonBubblingEventsToRetarget[type]) {\n    this.__handlers = this.__handlers || {};\n    this.__handlers[type] = this.__handlers[type] ||\n      {'capture': [], 'bubble': []};\n    this.__handlers[type][capture ? 'capture' : 'bubble'].push(wrapperFn);\n  } else {\n    let ael = this instanceof Window ? nativeMethods.windowAddEventListener :\n      nativeMethods.addEventListener;\n    ael.call(this, type, wrapperFn, optionsOrCapture);\n  }\n}\n\n/**\n * @this {Event}\n */\nexport function removeEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (optionsOrCapture && typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n  // Search the wrapped function.\n  let wrapperFn = undefined;\n  let wrappers = getEventWrappers(fnOrObj);\n  if (wrappers) {\n    let idx = findListener(wrappers, target, type, capture, once, passive);\n    if (idx > -1) {\n      wrapperFn = wrappers.splice(idx, 1)[0].wrapperFn;\n      // Cleanup.\n      if (!wrappers.length) {\n        fnOrObj[eventWrappersName] = undefined;\n      }\n    }\n  }\n  let rel = this instanceof Window ? nativeMethods.windowRemoveEventListener :\n    nativeMethods.removeEventListener;\n  rel.call(this, type, wrapperFn || fnOrObj, optionsOrCapture);\n  if (wrapperFn && nonBubblingEventsToRetarget[type] &&\n      this.__handlers && this.__handlers[type]) {\n    const arr = this.__handlers[type][capture ? 'capture' : 'bubble'];\n    const idx = arr.indexOf(wrapperFn);\n    if (idx > -1) {\n      arr.splice(idx, 1);\n    }\n  }\n}\n\nfunction activateFocusEventOverrides() {\n  for (let ev in nonBubblingEventsToRetarget) {\n    window.addEventListener(ev, function(e) {\n      if (!e['__target']) {\n        patchEvent(e);\n        retargetNonBubblingEvent(e);\n      }\n    }, true);\n  }\n}\n\nfunction patchEvent(event) {\n  event['__target'] = event.target;\n  event.__relatedTarget = event.relatedTarget;\n  // patch event prototype if we can\n  if (utils.settings.hasDescriptors) {\n    utils.patchPrototype(event, eventMixin);\n  // and fallback to patching instance\n  } else {\n    utils.extend(event, eventMixin);\n  }\n}\n\nlet PatchedEvent = mixinComposedFlag(window.Event);\nlet PatchedCustomEvent = mixinComposedFlag(window.CustomEvent);\nlet PatchedMouseEvent = mixinComposedFlag(window.MouseEvent);\n\nexport function patchEvents() {\n  window.Event = PatchedEvent;\n  window.CustomEvent = PatchedCustomEvent;\n  window.MouseEvent = PatchedMouseEvent;\n  activateFocusEventOverrides();\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nfunction newSplice(index, removed, addedCount) {\n  return {\n    index: index,\n    removed: removed,\n    addedCount: addedCount\n  };\n}\n\nconst EDIT_LEAVE = 0;\nconst EDIT_UPDATE = 1;\nconst EDIT_ADD = 2;\nconst EDIT_DELETE = 3;\n\n// Note: This function is *based* on the computation of the Levenshtein\n// \"edit\" distance. The one change is that \"updates\" are treated as two\n// edits - not one. With Array splices, an update is really a delete\n// followed by an add. By retaining this, we optimize for \"keeping\" the\n// maximum array items in the original array. For example:\n//\n//   'xxxx123' -> '123yyyy'\n//\n// With 1-edit updates, the shortest path would be just to update all seven\n// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This\n// leaves the substring '123' intact.\nfunction calcEditDistances(current, currentStart, currentEnd,\n                            old, oldStart, oldEnd) {\n  // \"Deletion\" columns\n  let rowCount = oldEnd - oldStart + 1;\n  let columnCount = currentEnd - currentStart + 1;\n  let distances = new Array(rowCount);\n\n  // \"Addition\" rows. Initialize null column.\n  for (let i = 0; i < rowCount; i++) {\n    distances[i] = new Array(columnCount);\n    distances[i][0] = i;\n  }\n\n  // Initialize null row\n  for (let j = 0; j < columnCount; j++)\n    distances[0][j] = j;\n\n  for (let i = 1; i < rowCount; i++) {\n    for (let j = 1; j < columnCount; j++) {\n      if (equals(current[currentStart + j - 1], old[oldStart + i - 1]))\n        distances[i][j] = distances[i - 1][j - 1];\n      else {\n        let north = distances[i - 1][j] + 1;\n        let west = distances[i][j - 1] + 1;\n        distances[i][j] = north < west ? north : west;\n      }\n    }\n  }\n\n  return distances;\n}\n\n// This starts at the final weight, and walks \"backward\" by finding\n// the minimum previous weight recursively until the origin of the weight\n// matrix.\nfunction spliceOperationsFromEditDistances(distances) {\n  let i = distances.length - 1;\n  let j = distances[0].length - 1;\n  let current = distances[i][j];\n  let edits = [];\n  while (i > 0 || j > 0) {\n    if (i == 0) {\n      edits.push(EDIT_ADD);\n      j--;\n      continue;\n    }\n    if (j == 0) {\n      edits.push(EDIT_DELETE);\n      i--;\n      continue;\n    }\n    let northWest = distances[i - 1][j - 1];\n    let west = distances[i - 1][j];\n    let north = distances[i][j - 1];\n\n    let min;\n    if (west < north)\n      min = west < northWest ? west : northWest;\n    else\n      min = north < northWest ? north : northWest;\n\n    if (min == northWest) {\n      if (northWest == current) {\n        edits.push(EDIT_LEAVE);\n      } else {\n        edits.push(EDIT_UPDATE);\n        current = northWest;\n      }\n      i--;\n      j--;\n    } else if (min == west) {\n      edits.push(EDIT_DELETE);\n      i--;\n      current = west;\n    } else {\n      edits.push(EDIT_ADD);\n      j--;\n      current = north;\n    }\n  }\n\n  edits.reverse();\n  return edits;\n}\n\n/**\n * Splice Projection functions:\n *\n * A splice map is a representation of how a previous array of items\n * was transformed into a new array of items. Conceptually it is a list of\n * tuples of\n *\n *   <index, removed, addedCount>\n *\n * which are kept in ascending index order of. The tuple represents that at\n * the |index|, |removed| sequence of items were removed, and counting forward\n * from |index|, |addedCount| items were added.\n */\n\n/**\n * Lacking individual splice mutation information, the minimal set of\n * splices can be synthesized given the previous state and final state of an\n * array. The basic approach is to calculate the edit distance matrix and\n * choose the shortest path through it.\n *\n * Complexity: O(l * p)\n *   l: The length of the current array\n *   p: The length of the old array\n */\nfunction calcSplices(current, currentStart, currentEnd,\n                      old, oldStart, oldEnd) {\n  let prefixCount = 0;\n  let suffixCount = 0;\n  let splice;\n\n  let minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);\n  if (currentStart == 0 && oldStart == 0)\n    prefixCount = sharedPrefix(current, old, minLength);\n\n  if (currentEnd == current.length && oldEnd == old.length)\n    suffixCount = sharedSuffix(current, old, minLength - prefixCount);\n\n  currentStart += prefixCount;\n  oldStart += prefixCount;\n  currentEnd -= suffixCount;\n  oldEnd -= suffixCount;\n\n  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)\n    return [];\n\n  if (currentStart == currentEnd) {\n    splice = newSplice(currentStart, [], 0);\n    while (oldStart < oldEnd)\n      splice.removed.push(old[oldStart++]);\n\n    return [ splice ];\n  } else if (oldStart == oldEnd)\n    return [ newSplice(currentStart, [], currentEnd - currentStart) ];\n\n  let ops = spliceOperationsFromEditDistances(\n      calcEditDistances(current, currentStart, currentEnd,\n                             old, oldStart, oldEnd));\n\n  splice = undefined;\n  let splices = [];\n  let index = currentStart;\n  let oldIndex = oldStart;\n  for (let i = 0; i < ops.length; i++) {\n    switch(ops[i]) {\n      case EDIT_LEAVE:\n        if (splice) {\n          splices.push(splice);\n          splice = undefined;\n        }\n\n        index++;\n        oldIndex++;\n        break;\n      case EDIT_UPDATE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n      case EDIT_ADD:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n        break;\n      case EDIT_DELETE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n    }\n  }\n\n  if (splice) {\n    splices.push(splice);\n  }\n  return splices;\n}\n\nfunction sharedPrefix(current, old, searchLength) {\n  for (let i = 0; i < searchLength; i++)\n    if (!equals(current[i], old[i]))\n      return i;\n  return searchLength;\n}\n\nfunction sharedSuffix(current, old, searchLength) {\n  let index1 = current.length;\n  let index2 = old.length;\n  let count = 0;\n  while (count < searchLength && equals(current[--index1], old[--index2]))\n    count++;\n\n  return count;\n}\n\nfunction equals(currentValue, previousValue) {\n  return currentValue === previousValue;\n}\n\nexport function calculateSplices(current, previous) {\n  return calcSplices(current, 0, current.length, previous, 0,\n                          previous.length);\n}\n\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as mutation from './logical-mutation.js';\nimport {calculateSplices} from './array-splice.js';\nimport * as utils from './utils.js';\nimport {enqueue} from './flush.js';\nimport {recordChildNodes} from './logical-tree.js';\nimport {removeChild, insertBefore, dispatchEvent} from './native-methods.js';\nimport {parentNode, childNodes} from './native-tree.js';\nimport {patchShadowRootAccessors} from './patch-accessors.js';\n\n// Do not export this object. It must be passed as the first argument to the\n// ShadyRoot constructor in `attachShadow` to prevent the constructor from\n// throwing. This prevents the user from being able to manually construct a\n// ShadyRoot (i.e. `new ShadowRoot()`).\nconst ShadyRootConstructionToken = {};\n\nconst CATCHALL_NAME = '__catchall';\n\n/**\n * @constructor\n * @extends {ShadowRoot}\n */\nexport let ShadyRoot = function(token, host, options) {\n  if (token !== ShadyRootConstructionToken) {\n    throw new TypeError('Illegal constructor');\n  }\n  // NOTE: this strange construction is necessary because\n  // DocumentFragment cannot be subclassed on older browsers.\n  let shadowRoot = document.createDocumentFragment();\n  shadowRoot.__proto__ = ShadyRoot.prototype;\n  /** @type {ShadyRoot} */ (shadowRoot)._init(host, options);\n  return shadowRoot;\n};\n\nShadyRoot.prototype = Object.create(DocumentFragment.prototype);\n\nShadyRoot.prototype._init = function(host, options) {\n  // NOTE: set a fake local name so this element can be\n  // distinguished from a DocumentFragment when patching.\n  // FF doesn't allow this to be `localName`\n  this.__localName = 'ShadyRoot';\n  // logical dom setup\n  recordChildNodes(host);\n  recordChildNodes(this);\n  // root <=> host\n  this.host = host;\n  this._mode = options && options.mode;\n  host.__shady = host.__shady || {};\n  host.__shady.root = this;\n  host.__shady.publicRoot = this._mode !== 'closed' ? this : null;\n  // state flags\n  this._renderPending = false;\n  this._hasRendered = false;\n  this._slotList = [];\n  this._slotMap = {};\n  this.__pendingSlots = [];\n  // fast path initial render: remove existing physical dom.\n  let c$ = childNodes(host);\n  for (let i=0, l=c$.length; i < l; i++) {\n    removeChild.call(host, c$[i])\n  }\n}\n\n// async render\nShadyRoot.prototype._asyncRender = function() {\n  if (!this._renderPending) {\n    this._renderPending = true;\n    enqueue(() => this._render());\n  }\n}\n\n// returns the oldest renderPending ancestor root.\nShadyRoot.prototype._getRenderRoot = function() {\n  let renderRoot;\n  let root = this;\n  while (root) {\n    if (root._renderPending) {\n      renderRoot = root;\n    }\n    root = root._rendererForHost();\n  }\n  return renderRoot;\n}\n\n// Returns the shadyRoot `this.host` if `this.host`\n// has children that require distribution.\nShadyRoot.prototype._rendererForHost = function() {\n  let root = this.host.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    let c$ = this.host.childNodes;\n    for (let i=0, c; i < c$.length; i++) {\n      c = c$[i];\n      if (this._isInsertionPoint(c)) {\n        return root;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._render = function() {\n  const root = this._getRenderRoot();\n  if (root) {\n    root['_renderRoot']();\n  }\n}\n\n// NOTE: avoid renaming to ease testability.\nShadyRoot.prototype['_renderRoot'] = function() {\n  this._renderPending = false;\n  this._distribute();\n  this._compose();\n  this._hasRendered = true;\n}\n\nShadyRoot.prototype._distribute = function() {\n  this._validateSlots();\n  // capture # of previously assigned nodes to help determine if dirty.\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    this._clearSlotAssignedNodes(slot);\n  }\n  // distribute host children.\n  for (let n=this.host.firstChild; n; n=n.nextSibling) {\n    this._distributeNodeToSlot(n);\n  }\n  // fallback content, slotchange, and dirty roots\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    // distribute fallback content\n    if (!slot.__shady.assignedNodes.length) {\n      for (let n=slot.firstChild; n; n=n.nextSibling) {\n        this._distributeNodeToSlot(n, slot);\n      }\n    }\n    const slotParent = slot.parentNode;\n    const slotParentRoot = slotParent.__shady && slotParent.__shady.root;\n    if (slotParentRoot && slotParentRoot._hasInsertionPoint()) {\n      slotParentRoot['_renderRoot']();\n    }\n    this._addAssignedToFlattenedNodes(slot.__shady.flattenedNodes,\n      slot.__shady.assignedNodes);\n    let prevAssignedNodes = slot.__shady._previouslyAssignedNodes;\n    if (prevAssignedNodes) {\n      for (let i=0; i < prevAssignedNodes.length; i++) {\n        prevAssignedNodes[i].__shady._prevAssignedSlot = null;\n      }\n      slot.__shady._previouslyAssignedNodes = null;\n      // dirty if previously less assigned nodes than previously assigned.\n      if (prevAssignedNodes.length > slot.__shady.assignedNodes.length) {\n        slot.__shady.dirty = true;\n      }\n    }\n    /* Note: A slot is marked dirty whenever a node is newly assigned to it\n    or a node is assigned to a different slot (done in `_distributeNodeToSlot`)\n    or if the number of nodes assigned to the slot has decreased (done above);\n     */\n    if (slot.__shady.dirty) {\n      slot.__shady.dirty = false;\n      this._fireSlotChange(slot);\n    }\n  }\n}\n\n/**\n * Distributes given `node` to the appropriate slot based on its `slot`\n * attribute. If `forcedSlot` is given, then the node is distributed to the\n * `forcedSlot`.\n * Note: slot to which the node is assigned will be marked dirty for firing\n * `slotchange`.\n * @param {Node} node\n * @param {Node=} forcedSlot\n *\n */\nShadyRoot.prototype._distributeNodeToSlot = function(node, forcedSlot) {\n  node.__shady = node.__shady || {};\n  let oldSlot = node.__shady._prevAssignedSlot;\n  node.__shady._prevAssignedSlot = null;\n  let slot = forcedSlot;\n  if (!slot) {\n    let name = node.slot || CATCHALL_NAME;\n    const list = this._slotMap[name];\n    slot = list && list[0];\n  }\n  if (slot) {\n    slot.__shady.assignedNodes.push(node);\n    node.__shady.assignedSlot = slot;\n  } else {\n    node.__shady.assignedSlot = undefined;\n  }\n  if (oldSlot !== node.__shady.assignedSlot) {\n    if (node.__shady.assignedSlot) {\n      node.__shady.assignedSlot.__shady.dirty = true;\n    }\n  }\n}\n\n/**\n * Clears the assignedNodes tracking data for a given `slot`. Note, the current\n * assigned node data is tracked (via _previouslyAssignedNodes and\n * _prevAssignedSlot) to see if `slotchange` should fire. This data may be out\n *  of date at this time because the assigned nodes may have already been\n * distributed to another root. This is ok since this data is only used to\n * track changes.\n * @param {HTMLSlotElement} slot\n */\nShadyRoot.prototype._clearSlotAssignedNodes = function(slot) {\n  let n$ = slot.__shady.assignedNodes;\n  slot.__shady.assignedNodes = [];\n  slot.__shady.flattenedNodes = [];\n  slot.__shady._previouslyAssignedNodes = n$;\n  if (n$) {\n    for (let i=0; i < n$.length; i++) {\n      let n = n$[i];\n      n.__shady._prevAssignedSlot = n.__shady.assignedSlot;\n      // only clear if it was previously set to this slot;\n      // this helps ensure that if the node has otherwise been distributed\n      // ignore it.\n      if (n.__shady.assignedSlot === slot) {\n        n.__shady.assignedSlot = null;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._addAssignedToFlattenedNodes = function(flattened, assigned) {\n  for (let i=0, n; (i<assigned.length) && (n=assigned[i]); i++) {\n    if (n.localName == 'slot') {\n      const nestedAssigned = n.__shady.assignedNodes;\n      if (nestedAssigned && nestedAssigned.length) {\n        this._addAssignedToFlattenedNodes(flattened, nestedAssigned);\n      }\n    } else {\n      flattened.push(assigned[i]);\n    }\n  }\n}\n\nShadyRoot.prototype._fireSlotChange = function(slot) {\n  // NOTE: cannot bubble correctly here so not setting bubbles: true\n  // Safari tech preview does not bubble but chrome does\n  // Spec says it bubbles (https://dom.spec.whatwg.org/#mutation-observers)\n  dispatchEvent.call(slot, new Event('slotchange'));\n  if (slot.__shady.assignedSlot) {\n    this._fireSlotChange(slot.__shady.assignedSlot);\n  }\n}\n\n// Reify dom such that it is at its correct rendering position\n// based on logical distribution.\n// NOTE: here we only compose parents of <slot> elements and not the\n// shadowRoot into the host. The latter is performend via a fast path\n// in the `logical-mutation`.insertBefore.\nShadyRoot.prototype._compose = function() {\n  const slots = this._slotList;\n  let composeList = [];\n  for (let i=0; i < slots.length; i++) {\n    const parent = slots[i].parentNode;\n    /* compose node only if:\n      (1) parent does not have a shadowRoot since shadowRoot has already\n      composed into the host\n      (2) we're not already composing it\n      [consider (n^2) but rare better than Set]\n    */\n    if (!(parent.__shady && parent.__shady.root) &&\n      composeList.indexOf(parent) < 0) {\n      composeList.push(parent);\n    }\n  }\n  for (let i=0; i < composeList.length; i++) {\n    const node = composeList[i];\n    const targetNode = node === this ? this.host : node;\n    this._updateChildNodes(targetNode, this._composeNode(node));\n  }\n}\n\n// Returns the list of nodes which should be rendered inside `node`.\nShadyRoot.prototype._composeNode = function(node) {\n  let children = [];\n  let c$ = node.childNodes;\n  for (let i = 0; i < c$.length; i++) {\n    let child = c$[i];\n    // Note: if we see a slot here, the nodes are guaranteed to need to be\n    // composed here. This is because if there is redistribution, it has\n    // already been handled by this point.\n    if (this._isInsertionPoint(child)) {\n      let flattenedNodes = child.__shady.flattenedNodes;\n      for (let j = 0; j < flattenedNodes.length; j++) {\n        let distributedNode = flattenedNodes[j];\n          children.push(distributedNode);\n      }\n    } else {\n      children.push(child);\n    }\n  }\n  return children;\n}\n\nShadyRoot.prototype._isInsertionPoint = function(node) {\n    return node.localName == 'slot';\n  }\n\n// Ensures that the rendered node list inside `container` is `children`.\nShadyRoot.prototype._updateChildNodes = function(container, children) {\n  let composed = childNodes(container);\n  let splices = calculateSplices(children, composed);\n  // process removals\n  for (let i=0, d=0, s; (i<splices.length) && (s=splices[i]); i++) {\n    for (let j=0, n; (j < s.removed.length) && (n=s.removed[j]); j++) {\n      // check if the node is still where we expect it is before trying\n      // to remove it; this can happen if we move a node and\n      // then schedule its previous host for distribution resulting in\n      // the node being removed here.\n      if (parentNode(n) === container) {\n        removeChild.call(container, n);\n      }\n      composed.splice(s.index + d, 1);\n    }\n    d -= s.addedCount;\n  }\n  // process adds\n  for (let i=0, s, next; (i<splices.length) && (s=splices[i]); i++) { //eslint-disable-line no-redeclare\n    next = composed[s.index];\n    for (let j=s.index, n; j < s.index + s.addedCount; j++) {\n      n = children[j];\n      insertBefore.call(container, n, next);\n      composed.splice(j, 0, n);\n    }\n  }\n}\n\nShadyRoot.prototype._addSlots = function(slots) {\n  this.__pendingSlots.push(...slots);\n}\n\nShadyRoot.prototype._validateSlots = function() {\n  if (this.__pendingSlots.length) {\n    this._mapSlots(this.__pendingSlots);\n    this.__pendingSlots = [];\n  }\n}\n\n/**\n * Adds the given slots. Slots are maintained in an dom-ordered list.\n * In addition a map of name to slot is updated.\n */\nShadyRoot.prototype._mapSlots = function(slots) {\n  let slotNamesToSort;\n  for (let i=0; i < slots.length; i++) {\n    let slot = slots[i];\n    // ensure insertionPoints's and their parents have logical dom info.\n    // save logical tree info\n    // a. for shadyRoot\n    // b. for insertion points (fallback)\n    // c. for parents of insertion points\n    slot.__shady = slot.__shady || {};\n    recordChildNodes(slot);\n    recordChildNodes(slot.parentNode);\n    let name = this._nameForSlot(slot);\n    if (this._slotMap[name]) {\n      slotNamesToSort = slotNamesToSort || {};\n      slotNamesToSort[name] = true;\n      this._slotMap[name].push(slot);\n    } else {\n      this._slotMap[name] = [slot];\n    }\n    this._slotList.push(slot);\n  }\n  if (slotNamesToSort) {\n    for (let n in slotNamesToSort) {\n      this._slotMap[n] = this._sortSlots(this._slotMap[n]);\n    }\n  }\n}\n\nShadyRoot.prototype._nameForSlot = function(slot) {\n  const name = slot['name'] || slot.getAttribute('name') || CATCHALL_NAME;\n  slot.__slotName = name;\n  return name;\n}\n\n/**\n * Slots are kept in an ordered list. Slots with the same name\n * are sorted here by tree order.\n */\nShadyRoot.prototype._sortSlots = function(slots) {\n  // NOTE: Cannot use `compareDocumentPosition` because it's not polyfilled,\n  // but the code here could be used to polyfill the preceeding/following info\n  // in `compareDocumentPosition`.\n  return slots.sort((a, b) => {\n    let listA = ancestorList(a);\n    let listB = ancestorList(b);\n    for (var i=0; i < listA.length; i++) {\n      let nA = listA[i];\n      let nB = listB[i];\n      if (nA !== nB) {\n        let c$ = Array.from(nA.parentNode.childNodes);\n        return c$.indexOf(nA) - c$.indexOf(nB);\n      }\n    }\n  });\n}\n\nfunction ancestorList(node) {\n  let ancestors = [];\n  do {\n    ancestors.unshift(node);\n  } while ((node = node.parentNode));\n  return ancestors;\n}\n\n/**\n * Removes from tracked slot data any slots contained within `container` and\n * then updates the tracked data (_slotList and _slotMap).\n * Any removed slots also have their `assignedNodes` removed from comopsed dom.\n */\nShadyRoot.prototype._removeContainedSlots = function(container) {\n  this._validateSlots();\n  let didRemove;\n  const map = this._slotMap;\n  for (let n in map) {\n    let slots = map[n];\n    for (let i=0; i < slots.length; i++) {\n      let slot = slots[i];\n      if (utils.contains(container, slot)) {\n        slots.splice(i, 1);\n        const x = this._slotList.indexOf(slot);\n        if (x >= 0) {\n          this._slotList.splice(x, 1);\n        }\n        i--;\n        this._removeFlattenedNodes(slot);\n        didRemove = true;\n      }\n    }\n  }\n  return didRemove;\n}\n\nShadyRoot.prototype._updateSlotName = function(slot) {\n  const oldName = slot.__slotName;\n  const name = this._nameForSlot(slot);\n  if (name === oldName) {\n    return;\n  }\n  // remove from existing tracking\n  let slots = this._slotMap[oldName];\n  const i = slots.indexOf(slot);\n  if (i >= 0) {\n    slots.splice(i, 1);\n  }\n  // add to new location and sort if nedessary\n  let list = this._slotMap[name] || (this._slotMap[name] = []);\n  list.push(slot);\n  if (list.length > 1) {\n    this._slotMap[name] = this._sortSlots(list);\n  }\n}\n\nShadyRoot.prototype._removeFlattenedNodes = function(slot) {\n  let n$ = slot.__shady.flattenedNodes;\n  if (n$) {\n    for (let i=0; i<n$.length; i++) {\n      let node = n$[i];\n      let parent = parentNode(node);\n      if (parent) {\n        removeChild.call(parent, node);\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._hasInsertionPoint = function() {\n  this._validateSlots();\n  return Boolean(this._slotList.length);\n}\n\nShadyRoot.prototype.addEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.addEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.removeEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.removeEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.getElementById = function(id) {\n  let result = mutation.query(this, function(n) {\n    return n.id == id;\n  }, function(n) {\n    return Boolean(n);\n  })[0];\n  return result || null;\n}\n\n/**\n  Implements a pared down version of ShadowDOM's scoping, which is easy to\n  polyfill across browsers.\n*/\nexport function attachShadow(host, options) {\n  if (!host) {\n    throw 'Must provide a host.';\n  }\n  if (!options) {\n    throw 'Not enough arguments.'\n  }\n  return new ShadyRoot(ShadyRootConstructionToken, host, options);\n}\n\npatchShadowRootAccessors(ShadyRoot.prototype);","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {flush} from './flush.js';\nimport {dispatchEvent, contains as nativeContains} from './native-methods.js';\nimport * as mutation from './logical-mutation.js';\nimport {ActiveElementAccessor, ShadowRootAccessor, patchAccessors} from './patch-accessors.js';\nimport {addEventListener, removeEventListener} from './patch-events.js';\nimport {attachShadow, ShadyRoot} from './attach-shadow.js';\n\nfunction getAssignedSlot(node) {\n  mutation.renderRootNode(node);\n  return node.__shady && node.__shady.assignedSlot || null;\n}\n\nlet windowMixin = {\n\n  // NOTE: ensure these methods are bound to `window` so that `this` is correct\n  // when called directly from global context without a receiver; e.g.\n  // `addEventListener(...)`.\n  addEventListener: addEventListener.bind(window),\n\n  removeEventListener: removeEventListener.bind(window)\n\n};\n\nlet nodeMixin = {\n\n  addEventListener: addEventListener,\n\n  removeEventListener: removeEventListener,\n\n  appendChild(node) {\n    return mutation.insertBefore(this, node);\n  },\n\n  insertBefore(node, ref_node) {\n    return mutation.insertBefore(this, node, ref_node);\n  },\n\n  removeChild(node) {\n    return mutation.removeChild(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  replaceChild(node, ref_node) {\n    mutation.insertBefore(this, node, ref_node);\n    mutation.removeChild(this, ref_node);\n    return node;\n  },\n\n  /**\n   * @this {Node}\n   */\n  cloneNode(deep) {\n    return mutation.cloneNode(this, deep);\n  },\n\n  /**\n   * @this {Node}\n   */\n  getRootNode(options) {\n    return mutation.getRootNode(this, options);\n  },\n\n  contains(node) {\n    return utils.contains(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  get isConnected() {\n    // Fast path for distributed nodes.\n    const ownerDocument = this.ownerDocument;\n    if (utils.hasDocumentContains && nativeContains.call(ownerDocument, this)) {\n      return true;\n    }\n    if (ownerDocument.documentElement &&\n      nativeContains.call(ownerDocument.documentElement, this)) {\n      return true;\n    }\n    let node = this;\n    while (node && !(node instanceof Document)) {\n      node = node.parentNode || (node instanceof ShadyRoot ? /** @type {ShadowRoot} */(node).host : undefined);\n    }\n    return !!(node && node instanceof Document);\n  },\n\n  /**\n   * @this {Node}\n   */\n  dispatchEvent(event) {\n    flush();\n    return dispatchEvent.call(this, event);\n  }\n\n};\n\n// NOTE: For some reason 'Text' redefines 'assignedSlot'\nlet textMixin = {\n  /**\n   * @this {Text}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n};\n\nlet fragmentMixin = {\n\n  // TODO(sorvell): consider doing native QSA and filtering results.\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelector(selector) {\n    // match selector and halt on first result.\n    let result = mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  },\n\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelectorAll(selector) {\n    return mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    });\n  }\n\n};\n\nlet slotMixin = {\n\n  /**\n   * @this {HTMLSlotElement}\n   */\n  assignedNodes(options) {\n    if (this.localName === 'slot') {\n      mutation.renderRootNode(this);\n      return this.__shady ?\n        ((options && options.flatten ? this.__shady.flattenedNodes :\n        this.__shady.assignedNodes) || []) :\n        [];\n    }\n  }\n\n};\n\nlet elementMixin = utils.extendAll({\n\n  /**\n   * @this {HTMLElement}\n   */\n  setAttribute(name, value) {\n    mutation.setAttribute(this, name, value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  removeAttribute(name) {\n    mutation.removeAttribute(this, name);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  attachShadow(options) {\n    return attachShadow(this, options);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get slot() {\n    return this.getAttribute('slot');\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  set slot(value) {\n    mutation.setAttribute(this, 'slot', value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n\n}, fragmentMixin, slotMixin);\n\nObject.defineProperties(elementMixin, ShadowRootAccessor);\n\nlet documentMixin = utils.extendAll({\n  /**\n   * @this {Document}\n   */\n  importNode(node, deep) {\n    return mutation.importNode(node, deep);\n  },\n\n  /**\n   * @this {Document}\n   */\n  getElementById(id) {\n    let result = mutation.query(this, function(n) {\n      return n.id == id;\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  }\n\n}, fragmentMixin);\n\nObject.defineProperties(documentMixin, {\n  '_activeElement': ActiveElementAccessor.activeElement\n});\n\nlet nativeBlur = HTMLElement.prototype.blur;\n\nlet htmlElementMixin = utils.extendAll({\n  /**\n   * @this {HTMLElement}\n   */\n  blur() {\n    let root = this.__shady && this.__shady.root;\n    let shadowActive = root && root.activeElement;\n    if (shadowActive) {\n      shadowActive.blur();\n    } else {\n      nativeBlur.call(this);\n    }\n  }\n})\n\nfunction patchBuiltin(proto, obj) {\n  let n$ = Object.getOwnPropertyNames(obj);\n  for (let i=0; i < n$.length; i++) {\n    let n = n$[i];\n    let d = Object.getOwnPropertyDescriptor(obj, n);\n    // NOTE: we prefer writing directly here because some browsers\n    // have descriptors that are writable but not configurable (e.g.\n    // `appendChild` on older browsers)\n    if (d.value) {\n      proto[n] = d.value;\n    } else {\n      Object.defineProperty(proto, n, d);\n    }\n  }\n}\n\n\n// Apply patches to builtins (e.g. Element.prototype). Some of these patches\n// can be done unconditionally (mostly methods like\n// `Element.prototype.appendChild`) and some can only be done when the browser\n// has proper descriptors on the builtin prototype\n// (e.g. `Element.prototype.firstChild`)`. When descriptors are not available,\n// elements are individually patched when needed (see e.g.\n// `patchInside/OutsideElementAccessors` in `patch-accessors.js`).\nexport function patchBuiltins() {\n  let nativeHTMLElement =\n    (window['customElements'] && window['customElements']['nativeHTMLElement']) ||\n    HTMLElement;\n  // These patches can always be done, for all supported browsers.\n  patchBuiltin(window.Node.prototype, nodeMixin);\n  patchBuiltin(window.Window.prototype, windowMixin);\n  patchBuiltin(window.Text.prototype, textMixin);\n  patchBuiltin(window.DocumentFragment.prototype, fragmentMixin);\n  patchBuiltin(window.Element.prototype, elementMixin);\n  patchBuiltin(window.Document.prototype, documentMixin);\n  if (window.HTMLSlotElement) {\n    patchBuiltin(window.HTMLSlotElement.prototype, slotMixin);\n  }\n  patchBuiltin(nativeHTMLElement.prototype, htmlElementMixin);\n  // These patches can *only* be done\n  // on browsers that have proper property descriptors on builtin prototypes.\n  // This includes: IE11, Edge, Chrome >= 4?; Safari >= 10, Firefox\n  // On older browsers (Chrome <= 4?, Safari 9), a per element patching\n  // strategy is used for patching accessors.\n  if (utils.settings.hasDescriptors) {\n    patchAccessors(window.Node.prototype);\n    patchAccessors(window.Text.prototype);\n    patchAccessors(window.DocumentFragment.prototype);\n    patchAccessors(window.Element.prototype);\n    patchAccessors(nativeHTMLElement.prototype);\n    patchAccessors(window.Document.prototype);\n    if (window.HTMLSlotElement) {\n      patchAccessors(window.HTMLSlotElement.prototype);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/**\n * Patches elements that interacts with ShadyDOM\n * such that tree traversal and mutation apis act like they would under\n * ShadowDOM.\n *\n * This import enables seemless interaction with ShadyDOM powered\n * custom elements, enabling better interoperation with 3rd party code,\n * libraries, and frameworks that use DOM tree manipulation apis.\n */\n\nimport * as utils from './utils.js';\nimport {flush, enqueue} from './flush.js';\nimport {observeChildren, unobserveChildren, filterMutations} from './observe-changes.js';\nimport * as nativeMethods from './native-methods.js';\nimport * as nativeTree from './native-tree.js';\nimport {patchBuiltins} from './patch-builtins.js';\nimport {patchEvents} from './patch-events.js';\nimport {ShadyRoot} from './attach-shadow.js';\n\nif (utils.settings.inUse) {\n  let ShadyDOM = {\n    // TODO(sorvell): remove when Polymer does not depend on this.\n    'inUse': utils.settings.inUse,\n    // TODO(sorvell): remove when Polymer does not depend on this\n    'patch': (node) => node,\n    'isShadyRoot': utils.isShadyRoot,\n    'enqueue': enqueue,\n    'flush': flush,\n    'settings': utils.settings,\n    'filterMutations': filterMutations,\n    'observeChildren': observeChildren,\n    'unobserveChildren': unobserveChildren,\n    'nativeMethods': nativeMethods,\n    'nativeTree': nativeTree\n  };\n\n  window['ShadyDOM'] = ShadyDOM;\n\n  // Apply patches to events...\n  patchEvents();\n  // Apply patches to builtins (e.g. Element.prototype) where applicable.\n  patchBuiltins();\n\n  window.ShadowRoot = ShadyRoot;\n}\n","const reservedTagList = new Set([\n  'annotation-xml',\n  'color-profile',\n  'font-face',\n  'font-face-src',\n  'font-face-uri',\n  'font-face-format',\n  'font-face-name',\n  'missing-glyph',\n]);\n\n/**\n * @param {string} localName\n * @returns {boolean}\n */\nexport function isValidCustomElementName(localName) {\n  const reserved = reservedTagList.has(localName);\n  const validForm = /^[a-z][.0-9_a-z]*-[\\-.0-9_a-z]*$/.test(localName);\n  return !reserved && validForm;\n}\n\n/**\n * @private\n * @param {!Node} node\n * @return {boolean}\n */\nexport function isConnected(node) {\n  // Use `Node#isConnected`, if defined.\n  const nativeValue = node.isConnected;\n  if (nativeValue !== undefined) {\n    return nativeValue;\n  }\n\n  /** @type {?Node|undefined} */\n  let current = node;\n  while (current && !(current.__CE_isImportDocument || current instanceof Document)) {\n    current = current.parentNode || (window.ShadowRoot && current instanceof ShadowRoot ? current.host : undefined);\n  }\n  return !!(current && (current.__CE_isImportDocument || current instanceof Document));\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextSiblingOrAncestorSibling(root, start) {\n  let node = start;\n  while (node && node !== root && !node.nextSibling) {\n    node = node.parentNode;\n  }\n  return (!node || node === root) ? null : node.nextSibling;\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextNode(root, start) {\n  return start.firstChild ? start.firstChild : nextSiblingOrAncestorSibling(root, start);\n}\n\n/**\n * @param {!Node} root\n * @param {!function(!Element)} callback\n * @param {!Set<Node>=} visitedImports\n */\nexport function walkDeepDescendantElements(root, callback, visitedImports = new Set()) {\n  let node = root;\n  while (node) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      const element = /** @type {!Element} */(node);\n\n      callback(element);\n\n      const localName = element.localName;\n      if (localName === 'link' && element.getAttribute('rel') === 'import') {\n        // If this import (polyfilled or not) has it's root node available,\n        // walk it.\n        const importNode = /** @type {!Node} */ (element.import);\n        if (importNode instanceof Node && !visitedImports.has(importNode)) {\n          // Prevent multiple walks of the same import root.\n          visitedImports.add(importNode);\n\n          for (let child = importNode.firstChild; child; child = child.nextSibling) {\n            walkDeepDescendantElements(child, callback, visitedImports);\n          }\n        }\n\n        // Ignore descendants of import links to prevent attempting to walk the\n        // elements created by the HTML Imports polyfill that we just walked\n        // above.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      } else if (localName === 'template') {\n        // Ignore descendants of templates. There shouldn't be any descendants\n        // because they will be moved into `.content` during construction in\n        // browsers that support template but, in case they exist and are still\n        // waiting to be moved by a polyfill, they will be ignored.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      }\n\n      // Walk shadow roots.\n      const shadowRoot = element.__CE_shadowRoot;\n      if (shadowRoot) {\n        for (let child = shadowRoot.firstChild; child; child = child.nextSibling) {\n          walkDeepDescendantElements(child, callback, visitedImports);\n        }\n      }\n    }\n\n    node = nextNode(root, node);\n  }\n}\n\n/**\n * Used to suppress Closure's \"Modifying the prototype is only allowed if the\n * constructor is in the same scope\" warning without using\n * `@suppress {newCheckTypes, duplicate}` because `newCheckTypes` is too broad.\n *\n * @param {!Object} destination\n * @param {string} name\n * @param {*} value\n */\nexport function setPropertyUnchecked(destination, name, value) {\n  destination[name] = value;\n}\n","/**\n * @enum {number}\n */\nconst CustomElementState = {\n  custom: 1,\n  failed: 2,\n};\n\nexport default CustomElementState;\n","import * as Utilities from './Utilities.js';\nimport CEState from './CustomElementState.js';\n\nexport default class CustomElementInternals {\n  constructor() {\n    /** @type {!Map<string, !CustomElementDefinition>} */\n    this._localNameToDefinition = new Map();\n\n    /** @type {!Map<!Function, !CustomElementDefinition>} */\n    this._constructorToDefinition = new Map();\n\n    /** @type {!Array<!function(!Node)>} */\n    this._patches = [];\n\n    /** @type {boolean} */\n    this._hasPatches = false;\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!CustomElementDefinition} definition\n   */\n  setDefinition(localName, definition) {\n    this._localNameToDefinition.set(localName, definition);\n    this._constructorToDefinition.set(definition.constructor, definition);\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!CustomElementDefinition|undefined}\n   */\n  localNameToDefinition(localName) {\n    return this._localNameToDefinition.get(localName);\n  }\n\n  /**\n   * @param {!Function} constructor\n   * @return {!CustomElementDefinition|undefined}\n   */\n  constructorToDefinition(constructor) {\n    return this._constructorToDefinition.get(constructor);\n  }\n\n  /**\n   * @param {!function(!Node)} listener\n   */\n  addPatch(listener) {\n    this._hasPatches = true;\n    this._patches.push(listener);\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patchTree(node) {\n    if (!this._hasPatches) return;\n\n    Utilities.walkDeepDescendantElements(node, element => this.patch(element));\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patch(node) {\n    if (!this._hasPatches) return;\n\n    if (node.__CE_patched) return;\n    node.__CE_patched = true;\n\n    for (let i = 0; i < this._patches.length; i++) {\n      this._patches[i](node);\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  connectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.connectedCallback(element);\n      } else {\n        this.upgradeElement(element);\n      }\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  disconnectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.disconnectedCallback(element);\n      }\n    }\n  }\n\n  /**\n   * Upgrades all uncustomized custom elements at and below a root node for\n   * which there is a definition. When custom element reaction callbacks are\n   * assumed to be called synchronously (which, by the current DOM / HTML spec\n   * definitions, they are *not*), callbacks for both elements customized\n   * synchronously by the parser and elements being upgraded occur in the same\n   * relative order.\n   *\n   * NOTE: This function, when used to simulate the construction of a tree that\n   * is already created but not customized (i.e. by the parser), does *not*\n   * prevent the element from reading the 'final' (true) state of the tree. For\n   * example, the element, during truly synchronous parsing / construction would\n   * see that it contains no children as they have not yet been inserted.\n   * However, this function does not modify the tree, the element will\n   * (incorrectly) have children. Additionally, self-modification restrictions\n   * for custom element constructors imposed by the DOM spec are *not* enforced.\n   *\n   *\n   * The following nested list shows the steps extending down from the HTML\n   * spec's parsing section that cause elements to be synchronously created and\n   * upgraded:\n   *\n   * The \"in body\" insertion mode:\n   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody\n   * - Switch on token:\n   *   .. other cases ..\n   *   -> Any other start tag\n   *      - [Insert an HTML element](below) for the token.\n   *\n   * Insert an HTML element:\n   * https://html.spec.whatwg.org/multipage/syntax.html#insert-an-html-element\n   * - Insert a foreign element for the token in the HTML namespace:\n   *   https://html.spec.whatwg.org/multipage/syntax.html#insert-a-foreign-element\n   *   - Create an element for a token:\n   *     https://html.spec.whatwg.org/multipage/syntax.html#create-an-element-for-the-token\n   *     - Will execute script flag is true?\n   *       - (Element queue pushed to the custom element reactions stack.)\n   *     - Create an element:\n   *       https://dom.spec.whatwg.org/#concept-create-element\n   *       - Sync CE flag is true?\n   *         - Constructor called.\n   *         - Self-modification restrictions enforced.\n   *       - Sync CE flag is false?\n   *         - (Upgrade reaction enqueued.)\n   *     - Attributes appended to element.\n   *       (`attributeChangedCallback` reactions enqueued.)\n   *     - Will execute script flag is true?\n   *       - (Element queue popped from the custom element reactions stack.\n   *         Reactions in the popped stack are invoked.)\n   *   - (Element queue pushed to the custom element reactions stack.)\n   *   - Insert the element:\n   *     https://dom.spec.whatwg.org/#concept-node-insert\n   *     - Shadow-including descendants are connected. During parsing\n   *       construction, there are no shadow-*excluding* descendants.\n   *       However, the constructor may have validly attached a shadow\n   *       tree to itself and added descendants to that shadow tree.\n   *       (`connectedCallback` reactions enqueued.)\n   *   - (Element queue popped from the custom element reactions stack.\n   *     Reactions in the popped stack are invoked.)\n   *\n   * @param {!Node} root\n   * @param {{\n   *   visitedImports: (!Set<!Node>|undefined),\n   *   upgrade: (!function(!Element)|undefined),\n   * }=} options\n   */\n  patchAndUpgradeTree(root, options = {}) {\n    const visitedImports = options.visitedImports || new Set();\n    const upgrade = options.upgrade || (element => this.upgradeElement(element));\n\n    const elements = [];\n\n    const gatherElements = element => {\n      if (element.localName === 'link' && element.getAttribute('rel') === 'import') {\n        // The HTML Imports polyfill sets a descendant element of the link to\n        // the `import` property, specifically this is *not* a Document.\n        const importNode = /** @type {?Node} */ (element.import);\n\n        if (importNode instanceof Node) {\n          importNode.__CE_isImportDocument = true;\n          // Connected links are associated with the registry.\n          importNode.__CE_hasRegistry = true;\n        }\n\n        if (importNode && importNode.readyState === 'complete') {\n          importNode.__CE_documentLoadHandled = true;\n        } else {\n          // If this link's import root is not available, its contents can't be\n          // walked. Wait for 'load' and walk it when it's ready.\n          element.addEventListener('load', () => {\n            const importNode = /** @type {!Node} */ (element.import);\n\n            if (importNode.__CE_documentLoadHandled) return;\n            importNode.__CE_documentLoadHandled = true;\n\n            // Clone the `visitedImports` set that was populated sync during\n            // the `patchAndUpgradeTree` call that caused this 'load' handler to\n            // be added. Then, remove *this* link's import node so that we can\n            // walk that import again, even if it was partially walked later\n            // during the same `patchAndUpgradeTree` call.\n            const clonedVisitedImports = new Set(visitedImports);\n            clonedVisitedImports.delete(importNode);\n\n            this.patchAndUpgradeTree(importNode, {visitedImports: clonedVisitedImports, upgrade});\n          });\n        }\n      } else {\n        elements.push(element);\n      }\n    };\n\n    // `walkDeepDescendantElements` populates (and internally checks against)\n    // `visitedImports` when traversing a loaded import.\n    Utilities.walkDeepDescendantElements(root, gatherElements, visitedImports);\n\n    if (this._hasPatches) {\n      for (let i = 0; i < elements.length; i++) {\n        this.patch(elements[i]);\n      }\n    }\n\n    for (let i = 0; i < elements.length; i++) {\n      upgrade(elements[i]);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  upgradeElement(element) {\n    const currentState = element.__CE_state;\n    if (currentState !== undefined) return;\n\n    // Prevent elements created in documents without a browsing context from\n    // upgrading.\n    //\n    // https://html.spec.whatwg.org/multipage/custom-elements.html#look-up-a-custom-element-definition\n    //   \"If document does not have a browsing context, return null.\"\n    //\n    // https://html.spec.whatwg.org/multipage/window-object.html#dom-document-defaultview\n    //   \"The defaultView IDL attribute of the Document interface, on getting,\n    //   must return this Document's browsing context's WindowProxy object, if\n    //   this Document has an associated browsing context, or null otherwise.\"\n    const ownerDocument = element.ownerDocument;\n    if (\n      !ownerDocument.defaultView &&\n      !(ownerDocument.__CE_isImportDocument && ownerDocument.__CE_hasRegistry)\n    ) return;\n\n    const definition = this.localNameToDefinition(element.localName);\n    if (!definition) return;\n\n    definition.constructionStack.push(element);\n\n    const constructor = definition.constructor;\n    try {\n      try {\n        let result = new (constructor)();\n        if (result !== element) {\n          throw new Error('The custom element constructor did not produce the element being upgraded.');\n        }\n      } finally {\n        definition.constructionStack.pop();\n      }\n    } catch (e) {\n      element.__CE_state = CEState.failed;\n      throw e;\n    }\n\n    element.__CE_state = CEState.custom;\n    element.__CE_definition = definition;\n\n    if (definition.attributeChangedCallback) {\n      const observedAttributes = definition.observedAttributes;\n      for (let i = 0; i < observedAttributes.length; i++) {\n        const name = observedAttributes[i];\n        const value = element.getAttribute(name);\n        if (value !== null) {\n          this.attributeChangedCallback(element, name, null, value, null);\n        }\n      }\n    }\n\n    if (Utilities.isConnected(element)) {\n      this.connectedCallback(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  connectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.connectedCallback) {\n      definition.connectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  disconnectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.disconnectedCallback) {\n      definition.disconnectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   * @param {string} name\n   * @param {?string} oldValue\n   * @param {?string} newValue\n   * @param {?string} namespace\n   */\n  attributeChangedCallback(element, name, oldValue, newValue, namespace) {\n    const definition = element.__CE_definition;\n    if (\n      definition.attributeChangedCallback &&\n      definition.observedAttributes.indexOf(name) > -1\n    ) {\n      definition.attributeChangedCallback.call(element, name, oldValue, newValue, namespace);\n    }\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\n\nexport default class DocumentConstructionObserver {\n  constructor(internals, doc) {\n    /**\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @type {!Document}\n     */\n    this._document = doc;\n\n    /**\n     * @type {MutationObserver|undefined}\n     */\n    this._observer = undefined;\n\n\n    // Simulate tree construction for all currently accessible nodes in the\n    // document.\n    this._internals.patchAndUpgradeTree(this._document);\n\n    if (this._document.readyState === 'loading') {\n      this._observer = new MutationObserver(this._handleMutations.bind(this));\n\n      // Nodes created by the parser are given to the observer *before* the next\n      // task runs. Inline scripts are run in a new task. This means that the\n      // observer will be able to handle the newly parsed nodes before the inline\n      // script is run.\n      this._observer.observe(this._document, {\n        childList: true,\n        subtree: true,\n      });\n    }\n  }\n\n  disconnect() {\n    if (this._observer) {\n      this._observer.disconnect();\n    }\n  }\n\n  /**\n   * @param {!Array<!MutationRecord>} mutations\n   */\n  _handleMutations(mutations) {\n    // Once the document's `readyState` is 'interactive' or 'complete', all new\n    // nodes created within that document will be the result of script and\n    // should be handled by patching.\n    const readyState = this._document.readyState;\n    if (readyState === 'interactive' || readyState === 'complete') {\n      this.disconnect();\n    }\n\n    for (let i = 0; i < mutations.length; i++) {\n      const addedNodes = mutations[i].addedNodes;\n      for (let j = 0; j < addedNodes.length; j++) {\n        const node = addedNodes[j];\n        this._internals.patchAndUpgradeTree(node);\n      }\n    }\n  }\n}\n","/**\n * @template T\n */\nexport default class Deferred {\n  constructor() {\n    /**\n     * @private\n     * @type {T|undefined}\n     */\n    this._value = undefined;\n\n    /**\n     * @private\n     * @type {Function|undefined}\n     */\n    this._resolve = undefined;\n\n    /**\n     * @private\n     * @type {!Promise<T>}\n     */\n    this._promise = new Promise(resolve => {\n      this._resolve = resolve;\n\n      if (this._value) {\n        resolve(this._value);\n      }\n    });\n  }\n\n  /**\n   * @param {T} value\n   */\n  resolve(value) {\n    if (this._value) {\n      throw new Error('Already resolved.');\n    }\n\n    this._value = value;\n\n    if (this._resolve) {\n      this._resolve(value);\n    }\n  }\n\n  /**\n   * @return {!Promise<T>}\n   */\n  toPromise() {\n    return this._promise;\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\nimport DocumentConstructionObserver from './DocumentConstructionObserver.js';\nimport Deferred from './Deferred.js';\nimport * as Utilities from './Utilities.js';\n\n/**\n * @unrestricted\n */\nexport default class CustomElementRegistry {\n\n  /**\n   * @param {!CustomElementInternals} internals\n   */\n  constructor(internals) {\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._elementDefinitionIsRunning = false;\n\n    /**\n     * @private\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @private\n     * @type {!Map<string, !Deferred<undefined>>}\n     */\n    this._whenDefinedDeferred = new Map();\n\n    /**\n     * The default flush callback triggers the document walk synchronously.\n     * @private\n     * @type {!Function}\n     */\n    this._flushCallback = fn => fn();\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._flushPending = false;\n\n    /**\n     * @private\n     * @type {!Array<!CustomElementDefinition>}\n     */\n    this._pendingDefinitions = [];\n\n    /**\n     * @private\n     * @type {!DocumentConstructionObserver}\n     */\n    this._documentConstructionObserver = new DocumentConstructionObserver(internals, document);\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!Function} constructor\n   */\n  define(localName, constructor) {\n    if (!(constructor instanceof Function)) {\n      throw new TypeError('Custom element constructors must be functions.');\n    }\n\n    if (!Utilities.isValidCustomElementName(localName)) {\n      throw new SyntaxError(`The element name '${localName}' is not valid.`);\n    }\n\n    if (this._internals.localNameToDefinition(localName)) {\n      throw new Error(`A custom element with name '${localName}' has already been defined.`);\n    }\n\n    if (this._elementDefinitionIsRunning) {\n      throw new Error('A custom element is already being defined.');\n    }\n    this._elementDefinitionIsRunning = true;\n\n    let connectedCallback;\n    let disconnectedCallback;\n    let adoptedCallback;\n    let attributeChangedCallback;\n    let observedAttributes;\n    try {\n      /** @type {!Object} */\n      const prototype = constructor.prototype;\n      if (!(prototype instanceof Object)) {\n        throw new TypeError('The custom element constructor\\'s prototype is not an object.');\n      }\n\n      function getCallback(name) {\n        const callbackValue = prototype[name];\n        if (callbackValue !== undefined && !(callbackValue instanceof Function)) {\n          throw new Error(`The '${name}' callback must be a function.`);\n        }\n        return callbackValue;\n      }\n\n      connectedCallback = getCallback('connectedCallback');\n      disconnectedCallback = getCallback('disconnectedCallback');\n      adoptedCallback = getCallback('adoptedCallback');\n      attributeChangedCallback = getCallback('attributeChangedCallback');\n      observedAttributes = constructor['observedAttributes'] || [];\n    } catch (e) {\n      return;\n    } finally {\n      this._elementDefinitionIsRunning = false;\n    }\n\n    const definition = {\n      localName,\n      constructor,\n      connectedCallback,\n      disconnectedCallback,\n      adoptedCallback,\n      attributeChangedCallback,\n      observedAttributes,\n      constructionStack: [],\n    };\n\n    this._internals.setDefinition(localName, definition);\n    this._pendingDefinitions.push(definition);\n\n    // If we've already called the flush callback and it hasn't called back yet,\n    // don't call it again.\n    if (!this._flushPending) {\n      this._flushPending = true;\n      this._flushCallback(() => this._flush());\n    }\n  }\n\n  _flush() {\n    // If no new definitions were defined, don't attempt to flush. This could\n    // happen if a flush callback keeps the function it is given and calls it\n    // multiple times.\n    if (this._flushPending === false) return;\n    this._flushPending = false;\n\n    const pendingDefinitions = this._pendingDefinitions;\n\n    /**\n     * Unupgraded elements with definitions that were defined *before* the last\n     * flush, in document order.\n     * @type {!Array<!Element>}\n     */\n    const elementsWithStableDefinitions = [];\n\n    /**\n     * A map from `localName`s of definitions that were defined *after* the last\n     * flush to unupgraded elements matching that definition, in document order.\n     * @type {!Map<string, !Array<!Element>>}\n     */\n    const elementsWithPendingDefinitions = new Map();\n    for (let i = 0; i < pendingDefinitions.length; i++) {\n      elementsWithPendingDefinitions.set(pendingDefinitions[i].localName, []);\n    }\n\n    this._internals.patchAndUpgradeTree(document, {\n      upgrade: element => {\n        // Ignore the element if it has already upgraded or failed to upgrade.\n        if (element.__CE_state !== undefined) return;\n\n        const localName = element.localName;\n\n        // If there is an applicable pending definition for the element, add the\n        // element to the list of elements to be upgraded with that definition.\n        const pendingElements = elementsWithPendingDefinitions.get(localName);\n        if (pendingElements) {\n          pendingElements.push(element);\n        // If there is *any other* applicable definition for the element, add it\n        // to the list of elements with stable definitions that need to be upgraded.\n        } else if (this._internals.localNameToDefinition(localName)) {\n          elementsWithStableDefinitions.push(element);\n        }\n      },\n    });\n\n    // Upgrade elements with 'stable' definitions first.\n    for (let i = 0; i < elementsWithStableDefinitions.length; i++) {\n      this._internals.upgradeElement(elementsWithStableDefinitions[i]);\n    }\n\n    // Upgrade elements with 'pending' definitions in the order they were defined.\n    while (pendingDefinitions.length > 0) {\n      const definition = pendingDefinitions.shift();\n      const localName = definition.localName;\n\n      // Attempt to upgrade all applicable elements.\n      const pendingUpgradableElements = elementsWithPendingDefinitions.get(definition.localName);\n      for (let i = 0; i < pendingUpgradableElements.length; i++) {\n        this._internals.upgradeElement(pendingUpgradableElements[i]);\n      }\n\n      // Resolve any promises created by `whenDefined` for the definition.\n      const deferred = this._whenDefinedDeferred.get(localName);\n      if (deferred) {\n        deferred.resolve(undefined);\n      }\n    }\n  }\n\n  /**\n   * @param {string} localName\n   * @return {Function|undefined}\n   */\n  get(localName) {\n    const definition = this._internals.localNameToDefinition(localName);\n    if (definition) {\n      return definition.constructor;\n    }\n\n    return undefined;\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!Promise<undefined>}\n   */\n  whenDefined(localName) {\n    if (!Utilities.isValidCustomElementName(localName)) {\n      return Promise.reject(new SyntaxError(`'${localName}' is not a valid custom element name.`));\n    }\n\n    const prior = this._whenDefinedDeferred.get(localName);\n    if (prior) {\n      return prior.toPromise();\n    }\n\n    const deferred = new Deferred();\n    this._whenDefinedDeferred.set(localName, deferred);\n\n    const definition = this._internals.localNameToDefinition(localName);\n    // Resolve immediately only if the given local name has a definition *and*\n    // the full document walk to upgrade elements with that local name has\n    // already happened.\n    if (definition && !this._pendingDefinitions.some(d => d.localName === localName)) {\n      deferred.resolve(undefined);\n    }\n\n    return deferred.toPromise();\n  }\n\n  polyfillWrapFlushCallback(outer) {\n    this._documentConstructionObserver.disconnect();\n    const inner = this._flushCallback;\n    this._flushCallback = flush => outer(() => inner(flush));\n  }\n}\n\n// Closure compiler exports.\nwindow['CustomElementRegistry'] = CustomElementRegistry;\nCustomElementRegistry.prototype['define'] = CustomElementRegistry.prototype.define;\nCustomElementRegistry.prototype['get'] = CustomElementRegistry.prototype.get;\nCustomElementRegistry.prototype['whenDefined'] = CustomElementRegistry.prototype.whenDefined;\nCustomElementRegistry.prototype['polyfillWrapFlushCallback'] = CustomElementRegistry.prototype.polyfillWrapFlushCallback;\n","export default {\n  Document_createElement: window.Document.prototype.createElement,\n  Document_createElementNS: window.Document.prototype.createElementNS,\n  Document_importNode: window.Document.prototype.importNode,\n  Document_prepend: window.Document.prototype['prepend'],\n  Document_append: window.Document.prototype['append'],\n  DocumentFragment_prepend: window.DocumentFragment.prototype['prepend'],\n  DocumentFragment_append: window.DocumentFragment.prototype['append'],\n  Node_cloneNode: window.Node.prototype.cloneNode,\n  Node_appendChild: window.Node.prototype.appendChild,\n  Node_insertBefore: window.Node.prototype.insertBefore,\n  Node_removeChild: window.Node.prototype.removeChild,\n  Node_replaceChild: window.Node.prototype.replaceChild,\n  Node_textContent: Object.getOwnPropertyDescriptor(window.Node.prototype, 'textContent'),\n  Element_attachShadow: window.Element.prototype['attachShadow'],\n  Element_innerHTML: Object.getOwnPropertyDescriptor(window.Element.prototype, 'innerHTML'),\n  Element_getAttribute: window.Element.prototype.getAttribute,\n  Element_setAttribute: window.Element.prototype.setAttribute,\n  Element_removeAttribute: window.Element.prototype.removeAttribute,\n  Element_getAttributeNS: window.Element.prototype.getAttributeNS,\n  Element_setAttributeNS: window.Element.prototype.setAttributeNS,\n  Element_removeAttributeNS: window.Element.prototype.removeAttributeNS,\n  Element_insertAdjacentElement: window.Element.prototype['insertAdjacentElement'],\n  Element_prepend: window.Element.prototype['prepend'],\n  Element_append: window.Element.prototype['append'],\n  Element_before: window.Element.prototype['before'],\n  Element_after: window.Element.prototype['after'],\n  Element_replaceWith: window.Element.prototype['replaceWith'],\n  Element_remove: window.Element.prototype['remove'],\n  HTMLElement: window.HTMLElement,\n  HTMLElement_innerHTML: Object.getOwnPropertyDescriptor(window.HTMLElement.prototype, 'innerHTML'),\n  HTMLElement_insertAdjacentElement: window.HTMLElement.prototype['insertAdjacentElement'],\n};\n","/**\n * This class exists only to work around Closure's lack of a way to describe\n * singletons. It represents the 'already constructed marker' used in custom\n * element construction stacks.\n *\n * https://html.spec.whatwg.org/#concept-already-constructed-marker\n */\nclass AlreadyConstructedMarker {}\n\nexport default new AlreadyConstructedMarker();\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport AlreadyConstructedMarker from '../AlreadyConstructedMarker.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  window['HTMLElement'] = (function() {\n    /**\n     * @type {function(new: HTMLElement): !HTMLElement}\n     */\n    function HTMLElement() {\n      // This should really be `new.target` but `new.target` can't be emulated\n      // in ES5. Assuming the user keeps the default value of the constructor's\n      // prototype's `constructor` property, this is equivalent.\n      /** @type {!Function} */\n      const constructor = this.constructor;\n\n      const definition = internals.constructorToDefinition(constructor);\n      if (!definition) {\n        throw new Error('The custom element being constructed was not registered with `customElements`.');\n      }\n\n      const constructionStack = definition.constructionStack;\n\n      if (constructionStack.length === 0) {\n        const element = Native.Document_createElement.call(document, definition.localName);\n        Object.setPrototypeOf(element, constructor.prototype);\n        element.__CE_state = CEState.custom;\n        element.__CE_definition = definition;\n        internals.patch(element);\n        return element;\n      }\n\n      const lastIndex = constructionStack.length - 1;\n      const element = constructionStack[lastIndex];\n      if (element === AlreadyConstructedMarker) {\n        throw new Error('The HTMLElement constructor was either called reentrantly for this constructor or called multiple times.');\n      }\n      constructionStack[lastIndex] = AlreadyConstructedMarker;\n\n      Object.setPrototypeOf(element, constructor.prototype);\n      internals.patch(/** @type {!HTMLElement} */ (element));\n\n      return element;\n    }\n\n    HTMLElement.prototype = Native.HTMLElement.prototype;\n\n    return HTMLElement;\n  })();\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   prepend: !function(...(!Node|string)),\n  *  append: !function(...(!Node|string)),\n * }}\n */\nlet ParentNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ParentNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function appendPrependPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.prepend !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'prepend', appendPrependPatch(builtIn.prepend));\n  }\n\n  if (builtIn.append !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'append', appendPrependPatch(builtIn.append));\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElement',\n    /**\n     * @this {Document}\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElement.call(this, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'importNode',\n    /**\n     * @this {Document}\n     * @param {!Node} node\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(node, deep) {\n      const clone = Native.Document_importNode.call(this, node, deep);\n      // Only create custom elements if this document is associated with the registry.\n      if (!this.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  const NS_HTML = \"http://www.w3.org/1999/xhtml\";\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElementNS',\n    /**\n     * @this {Document}\n     * @param {?string} namespace\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(namespace, localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry && (namespace === null || namespace === NS_HTML)) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElementNS.call(this, namespace, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  PatchParentNode(internals, Document.prototype, {\n    prepend: Native.Document_prepend,\n    append: Native.Document_append,\n  });\n};\n","import CustomElementInternals from '../CustomElementInternals.js';\nimport Native from './Native.js';\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  PatchParentNode(internals, DocumentFragment.prototype, {\n    prepend: Native.DocumentFragment_prepend,\n    append: Native.DocumentFragment_append,\n  });\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  // `Node#nodeValue` is implemented on `Attr`.\n  // `Node#textContent` is implemented on `Attr`, `Element`.\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'insertBefore',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @param {?Node} refNode\n     * @return {!Node}\n     */\n    function(node, refNode) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'appendChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_appendChild.call(this, node);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_appendChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'cloneNode',\n    /**\n     * @this {Node}\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(deep) {\n      const clone = Native.Node_cloneNode.call(this, deep);\n      // Only create custom elements if this element's owner document is\n      // associated with the registry.\n      if (!this.ownerDocument.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'removeChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_removeChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'replaceChild',\n    /**\n     * @this {Node}\n     * @param {!Node} nodeToInsert\n     * @param {!Node} nodeToRemove\n     * @return {!Node}\n     */\n    function(nodeToInsert, nodeToRemove) {\n      if (nodeToInsert instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(nodeToInsert.childNodes);\n        const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          internals.disconnectTree(nodeToRemove);\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeToInsertWasConnected = Utilities.isConnected(nodeToInsert);\n      const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n      const thisIsConnected = Utilities.isConnected(this);\n\n      if (thisIsConnected) {\n        internals.disconnectTree(nodeToRemove);\n      }\n\n      if (nodeToInsertWasConnected) {\n        internals.disconnectTree(nodeToInsert);\n      }\n\n      if (thisIsConnected) {\n        internals.connectTree(nodeToInsert);\n      }\n\n      return nativeResult;\n    });\n\n\n  function patch_textContent(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'textContent', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Node} */ function(assignedValue) {\n        // If this is a text node then there are no nodes to disconnect.\n        if (this.nodeType === Node.TEXT_NODE) {\n          baseDescriptor.set.call(this, assignedValue);\n          return;\n        }\n\n        let removedNodes = undefined;\n        // Checking for `firstChild` is faster than reading `childNodes.length`\n        // to compare with 0.\n        if (this.firstChild) {\n          // Using `childNodes` is faster than `children`, even though we only\n          // care about elements.\n          const childNodes = this.childNodes;\n          const childNodesLength = childNodes.length;\n          if (childNodesLength > 0 && Utilities.isConnected(this)) {\n            // Copying an array by iterating is faster than using slice.\n            removedNodes = new Array(childNodesLength);\n            for (let i = 0; i < childNodesLength; i++) {\n              removedNodes[i] = childNodes[i];\n            }\n          }\n        }\n\n        baseDescriptor.set.call(this, assignedValue);\n\n        if (removedNodes) {\n          for (let i = 0; i < removedNodes.length; i++) {\n            internals.disconnectTree(removedNodes[i]);\n          }\n        }\n      },\n    });\n  }\n\n  if (Native.Node_textContent && Native.Node_textContent.get) {\n    patch_textContent(Node.prototype, Native.Node_textContent);\n  } else {\n    internals.addPatch(function(element) {\n      patch_textContent(element, {\n        enumerable: true,\n        configurable: true,\n        // NOTE: This implementation of the `textContent` getter assumes that\n        // text nodes' `textContent` getter will not be patched.\n        get: /** @this {Node} */ function() {\n          /** @type {!Array<string>} */\n          const parts = [];\n\n          for (let i = 0; i < this.childNodes.length; i++) {\n            parts.push(this.childNodes[i].textContent);\n          }\n\n          return parts.join('');\n        },\n        set: /** @this {Node} */ function(assignedValue) {\n          while (this.firstChild) {\n            Native.Node_removeChild.call(this, this.firstChild);\n          }\n          Native.Node_appendChild.call(this, document.createTextNode(assignedValue));\n        },\n      });\n    });\n  }\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   before: !function(...(!Node|string)),\n *   after: !function(...(!Node|string)),\n *   replaceWith: !function(...(!Node|string)),\n *   remove: !function(),\n * }}\n */\nlet ChildNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ChildNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function beforeAfterPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'before', beforeAfterPatch(builtIn.before));\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'after', beforeAfterPatch(builtIn.after));\n  }\n\n  if (builtIn.replaceWith !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'replaceWith',\n      /**\n       * @param {...(!Node|string)} nodes\n       */\n      function(...nodes) {\n        /**\n         * A copy of `nodes`, with any DocumentFragment replaced by its children.\n         * @type {!Array<!Node>}\n         */\n        const flattenedNodes = [];\n\n        /**\n         * Elements in `nodes` that were connected before this call.\n         * @type {!Array<!Node>}\n         */\n        const connectedElements = [];\n\n        for (var i = 0; i < nodes.length; i++) {\n          const node = nodes[i];\n\n          if (node instanceof Element && Utilities.isConnected(node)) {\n            connectedElements.push(node);\n          }\n\n          if (node instanceof DocumentFragment) {\n            for (let child = node.firstChild; child; child = child.nextSibling) {\n              flattenedNodes.push(child);\n            }\n          } else {\n            flattenedNodes.push(node);\n          }\n        }\n\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.replaceWith.apply(this, nodes);\n\n        for (let i = 0; i < connectedElements.length; i++) {\n          internals.disconnectTree(connectedElements[i]);\n        }\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n          for (let i = 0; i < flattenedNodes.length; i++) {\n            const node = flattenedNodes[i];\n            if (node instanceof Element) {\n              internals.connectTree(node);\n            }\n          }\n        }\n      });\n    }\n\n  if (builtIn.remove !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'remove',\n      function() {\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.remove.call(this);\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n        }\n      });\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\nimport PatchChildNode from './Interface/ChildNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  if (Native.Element_attachShadow) {\n    Utilities.setPropertyUnchecked(Element.prototype, 'attachShadow',\n      /**\n       * @this {Element}\n       * @param {!{mode: string}} init\n       * @return {ShadowRoot}\n       */\n      function(init) {\n        const shadowRoot = Native.Element_attachShadow.call(this, init);\n        this.__CE_shadowRoot = shadowRoot;\n        return shadowRoot;\n      });\n  }\n\n\n  function patch_innerHTML(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'innerHTML', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Element} */ function(htmlString) {\n        const isConnected = Utilities.isConnected(this);\n\n        // NOTE: In IE11, when using the native `innerHTML` setter, all nodes\n        // that were previously descendants of the context element have all of\n        // their children removed as part of the set - the entire subtree is\n        // 'disassembled'. This work around walks the subtree *before* using the\n        // native setter.\n        /** @type {!Array<!Element>|undefined} */\n        let removedElements = undefined;\n        if (isConnected) {\n          removedElements = [];\n          Utilities.walkDeepDescendantElements(this, element => {\n            if (element !== this) {\n              removedElements.push(element);\n            }\n          });\n        }\n\n        baseDescriptor.set.call(this, htmlString);\n\n        if (removedElements) {\n          for (let i = 0; i < removedElements.length; i++) {\n            const element = removedElements[i];\n            if (element.__CE_state === CEState.custom) {\n              internals.disconnectedCallback(element);\n            }\n          }\n        }\n\n        // Only create custom elements if this element's owner document is\n        // associated with the registry.\n        if (!this.ownerDocument.__CE_hasRegistry) {\n          internals.patchTree(this);\n        } else {\n          internals.patchAndUpgradeTree(this);\n        }\n        return htmlString;\n      },\n    });\n  }\n\n  if (Native.Element_innerHTML && Native.Element_innerHTML.get) {\n    patch_innerHTML(Element.prototype, Native.Element_innerHTML);\n  } else if (Native.HTMLElement_innerHTML && Native.HTMLElement_innerHTML.get) {\n    patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);\n  } else {\n\n    internals.addPatch(function(element) {\n      patch_innerHTML(element, {\n        enumerable: true,\n        configurable: true,\n        // Implements getting `innerHTML` by performing an unpatched `cloneNode`\n        // of the element and returning the resulting element's `innerHTML`.\n        // TODO: Is this too expensive?\n        get: /** @this {Element} */ function() {\n          return Native.Node_cloneNode.call(this, true).innerHTML;\n        },\n        // Implements setting `innerHTML` by creating an unpatched element,\n        // setting `innerHTML` of that element and replacing the target\n        // element's children with those of the unpatched element.\n        set: /** @this {Element} */ function(assignedValue) {\n          // NOTE: re-route to `content` for `template` elements.\n          // We need to do this because `template.appendChild` does not\n          // route into `template.content`.\n          const isTemplate = (this.localName === 'template');\n          /** @type {!Node} */\n          const content = isTemplate ? (/** @type {!HTMLTemplateElement} */\n            (this)).content : this;\n          /** @type {!Node} */\n          const rawElement = Native.Document_createElement.call(document,\n            this.localName);\n          rawElement.innerHTML = assignedValue;\n\n          while (content.childNodes.length > 0) {\n            Native.Node_removeChild.call(content, content.childNodes[0]);\n          }\n          const container = isTemplate ? rawElement.content : rawElement;\n          while (container.childNodes.length > 0) {\n            Native.Node_appendChild.call(content, container.childNodes[0]);\n          }\n        },\n      });\n    });\n  }\n\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttribute.call(this, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_setAttribute.call(this, name, newValue);\n      newValue = Native.Element_getAttribute.call(this, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, null);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(namespace, name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     */\n    function(name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttribute.call(this, name);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_removeAttribute.call(this, name);\n      if (oldValue !== null) {\n        internals.attributeChangedCallback(this, name, oldValue, null, null);\n      }\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     */\n    function(namespace, name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttributeNS.call(this, namespace, name);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_removeAttributeNS.call(this, namespace, name);\n      // In older browsers, `Element#getAttributeNS` may return the empty string\n      // instead of null if the attribute does not exist. For details, see;\n      // https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes\n      const newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      if (oldValue !== newValue) {\n        internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n      }\n    });\n\n\n  function patch_insertAdjacentElement(destination, baseMethod) {\n    Utilities.setPropertyUnchecked(destination, 'insertAdjacentElement',\n      /**\n       * @this {Element}\n       * @param {string} where\n       * @param {!Element} element\n       * @return {?Element}\n       */\n      function(where, element) {\n        const wasConnected = Utilities.isConnected(element);\n        const insertedElement = /** @type {!Element} */\n          (baseMethod.call(this, where, element));\n\n        if (wasConnected) {\n          internals.disconnectTree(element);\n        }\n\n        if (Utilities.isConnected(insertedElement)) {\n          internals.connectTree(element);\n        }\n        return insertedElement;\n      });\n  }\n\n  if (Native.HTMLElement_insertAdjacentElement) {\n    patch_insertAdjacentElement(HTMLElement.prototype, Native.HTMLElement_insertAdjacentElement);\n  } else if (Native.Element_insertAdjacentElement) {\n    patch_insertAdjacentElement(Element.prototype, Native.Element_insertAdjacentElement);\n  } else {\n    console.warn('Custom Elements: `Element#insertAdjacentElement` was not patched.');\n  }\n\n\n  PatchParentNode(internals, Element.prototype, {\n    prepend: Native.Element_prepend,\n    append: Native.Element_append,\n  });\n\n  PatchChildNode(internals, Element.prototype, {\n    before: Native.Element_before,\n    after: Native.Element_after,\n    replaceWith: Native.Element_replaceWith,\n    remove: Native.Element_remove,\n  });\n};\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\nimport CustomElementInternals from './CustomElementInternals.js';\nimport CustomElementRegistry from './CustomElementRegistry.js';\n\nimport PatchHTMLElement from './Patch/HTMLElement.js';\nimport PatchDocument from './Patch/Document.js';\nimport PatchDocumentFragment from './Patch/DocumentFragment.js';\nimport PatchNode from './Patch/Node.js';\nimport PatchElement from './Patch/Element.js';\n\nconst priorCustomElements = window['customElements'];\n\nif (!priorCustomElements ||\n     priorCustomElements['forcePolyfill'] ||\n     (typeof priorCustomElements['define'] != 'function') ||\n     (typeof priorCustomElements['get'] != 'function')) {\n  /** @type {!CustomElementInternals} */\n  const internals = new CustomElementInternals();\n\n  PatchHTMLElement(internals);\n  PatchDocument(internals);\n  PatchDocumentFragment(internals);\n  PatchNode(internals);\n  PatchElement(internals);\n\n  // The main document is always associated with the registry.\n  document.__CE_hasRegistry = true;\n\n  /** @type {!CustomElementRegistry} */\n  const customElements = new CustomElementRegistry(internals);\n\n  Object.defineProperty(window, 'customElements', {\n    configurable: true,\n    enumerable: true,\n    value: customElements,\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/*\nExtremely simple css parser. Intended to be not more than what we need\nand definitely not necessarily correct =).\n*/\n\n'use strict';\n\n/** @unrestricted */\nclass StyleNode {\n  constructor() {\n    /** @type {number} */\n    this['start'] = 0;\n    /** @type {number} */\n    this['end'] = 0;\n    /** @type {StyleNode} */\n    this['previous'] = null;\n    /** @type {StyleNode} */\n    this['parent'] = null;\n    /** @type {Array<StyleNode>} */\n    this['rules'] = null;\n    /** @type {string} */\n    this['parsedCssText'] = '';\n    /** @type {string} */\n    this['cssText'] = '';\n    /** @type {boolean} */\n    this['atRule'] = false;\n    /** @type {number} */\n    this['type'] = 0;\n    /** @type {string} */\n    this['keyframesName'] = '';\n    /** @type {string} */\n    this['selector'] = '';\n    /** @type {string} */\n    this['parsedSelector'] = '';\n  }\n}\n\nexport {StyleNode}\n\n// given a string of css, return a simple rule tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nexport function parse(text) {\n  text = clean(text);\n  return parseCss(lex(text), text);\n}\n\n// remove stuff we don't care about that may hinder parsing\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction clean(cssText) {\n  return cssText.replace(RX.comments, '').replace(RX.port, '');\n}\n\n// super simple {...} lexer that returns a node tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nfunction lex(text) {\n  let root = new StyleNode();\n  root['start'] = 0;\n  root['end'] = text.length\n  let n = root;\n  for (let i = 0, l = text.length; i < l; i++) {\n    if (text[i] === OPEN_BRACE) {\n      if (!n['rules']) {\n        n['rules'] = [];\n      }\n      let p = n;\n      let previous = p['rules'][p['rules'].length - 1] || null;\n      n = new StyleNode();\n      n['start'] = i + 1;\n      n['parent'] = p;\n      n['previous'] = previous;\n      p['rules'].push(n);\n    } else if (text[i] === CLOSE_BRACE) {\n      n['end'] = i + 1;\n      n = n['parent'] || root;\n    }\n  }\n  return root;\n}\n\n// add selectors/cssText to node tree\n/**\n * @param {StyleNode} node\n * @param {string} text\n * @return {StyleNode}\n */\nfunction parseCss(node, text) {\n  let t = text.substring(node['start'], node['end'] - 1);\n  node['parsedCssText'] = node['cssText'] = t.trim();\n  if (node['parent']) {\n    let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];\n    t = text.substring(ss, node['start'] - 1);\n    t = _expandUnicodeEscapes(t);\n    t = t.replace(RX.multipleSpaces, ' ');\n    // TODO(sorvell): ad hoc; make selector include only after last ;\n    // helps with mixin syntax\n    t = t.substring(t.lastIndexOf(';') + 1);\n    let s = node['parsedSelector'] = node['selector'] = t.trim();\n    node['atRule'] = (s.indexOf(AT_START) === 0);\n    // note, support a subset of rule types...\n    if (node['atRule']) {\n      if (s.indexOf(MEDIA_START) === 0) {\n        node['type'] = types.MEDIA_RULE;\n      } else if (s.match(RX.keyframesRule)) {\n        node['type'] = types.KEYFRAMES_RULE;\n        node['keyframesName'] =\n          node['selector'].split(RX.multipleSpaces).pop();\n      }\n    } else {\n      if (s.indexOf(VAR_START) === 0) {\n        node['type'] = types.MIXIN_RULE;\n      } else {\n        node['type'] = types.STYLE_RULE;\n      }\n    }\n  }\n  let r$ = node['rules'];\n  if (r$) {\n    for (let i = 0, l = r$.length, r;\n      (i < l) && (r = r$[i]); i++) {\n      parseCss(r, text);\n    }\n  }\n  return node;\n}\n\n/**\n * conversion of sort unicode escapes with spaces like `\\33 ` (and longer) into\n * expanded form that doesn't require trailing space `\\000033`\n * @param {string} s\n * @return {string}\n */\nfunction _expandUnicodeEscapes(s) {\n  return s.replace(/\\\\([0-9a-f]{1,6})\\s/gi, function() {\n    let code = arguments[1],\n      repeat = 6 - code.length;\n    while (repeat--) {\n      code = '0' + code;\n    }\n    return '\\\\' + code;\n  });\n}\n\n/**\n * stringify parsed css.\n * @param {StyleNode} node\n * @param {boolean=} preserveProperties\n * @param {string=} text\n * @return {string}\n */\nexport function stringify(node, preserveProperties, text = '') {\n  // calc rule cssText\n  let cssText = '';\n  if (node['cssText'] || node['rules']) {\n    let r$ = node['rules'];\n    if (r$ && !_hasMixinRules(r$)) {\n      for (let i = 0, l = r$.length, r;\n        (i < l) && (r = r$[i]); i++) {\n        cssText = stringify(r, preserveProperties, cssText);\n      }\n    } else {\n      cssText = preserveProperties ? node['cssText'] :\n        removeCustomProps(node['cssText']);\n      cssText = cssText.trim();\n      if (cssText) {\n        cssText = '  ' + cssText + '\\n';\n      }\n    }\n  }\n  // emit rule if there is cssText\n  if (cssText) {\n    if (node['selector']) {\n      text += node['selector'] + ' ' + OPEN_BRACE + '\\n';\n    }\n    text += cssText;\n    if (node['selector']) {\n      text += CLOSE_BRACE + '\\n\\n';\n    }\n  }\n  return text;\n}\n\n/**\n * @param {Array<StyleNode>} rules\n * @return {boolean}\n */\nfunction _hasMixinRules(rules) {\n  let r = rules[0];\n  return Boolean(r) && Boolean(r['selector']) && r['selector'].indexOf(VAR_START) === 0;\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomProps(cssText) {\n  cssText = removeCustomPropAssignment(cssText);\n  return removeCustomPropApply(cssText);\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nexport function removeCustomPropAssignment(cssText) {\n  return cssText\n    .replace(RX.customProp, '')\n    .replace(RX.mixinProp, '');\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomPropApply(cssText) {\n  return cssText\n    .replace(RX.mixinApply, '')\n    .replace(RX.varApply, '');\n}\n\n/** @enum {number} */\nexport const types = {\n  STYLE_RULE: 1,\n  KEYFRAMES_RULE: 7,\n  MEDIA_RULE: 4,\n  MIXIN_RULE: 1000\n}\n\nconst OPEN_BRACE = '{';\nconst CLOSE_BRACE = '}';\n\n// helper regexp's\nconst RX = {\n  comments: /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//gim,\n  port: /@import[^;]*;/gim,\n  customProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?(?:[;\\n]|$)/gim,\n  mixinProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?{[^}]*?}(?:[;\\n]|$)?/gim,\n  mixinApply: /@apply\\s*\\(?[^);]*\\)?\\s*(?:[;\\n]|$)?/gim,\n  varApply: /[^;:]*?:[^;]*?var\\([^;]*\\)(?:[;\\n]|$)?/gim,\n  keyframesRule: /^@[^\\s]*keyframes/,\n  multipleSpaces: /\\s+/g\n}\n\nconst VAR_START = '--';\nconst MEDIA_START = '@media';\nconst AT_START = '@';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport let nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);\nexport let nativeCssVariables;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n  if (settings && settings['shimcssproperties']) {\n    nativeCssVariables = false;\n  } else {\n    // chrome 49 has semi-working css vars, check if box-shadow works\n    // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n    // However, shim css custom properties are only supported with ShadyDOM enabled,\n    // so fall back on native if we do not detect ShadyDOM\n    // Edge 15: custom properties used in ::before and ::after will also be used in the parent element\n    // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12414257/\n    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match(/AppleWebKit\\/601|Edge\\/15/) &&\n      window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));\n  }\n}\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n  nativeCssVariables = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n  calcCssVariables(window.ShadyCSS);\n  // reset window variable to let ShadyCSS API take its place\n  window.ShadyCSS = undefined;\n} else {\n  calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport const VAR_ASSIGN = /(?:^|[;\\s{]\\s*)(--[\\w-]*?)\\s*:\\s*(?:((?:'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\([^)]*?\\)|[^};{])+)|\\{([^}]*)\\}(?:(?=[;\\s}])|$))/gi;\nexport const MIXIN_MATCH = /(?:^|\\W+)@apply\\s*\\(?([^);\\n]*)\\)?/gi;\nexport const VAR_CONSUMED = /(--[\\w-]+)\\s*([:,;)]|$)/gi;\nexport const ANIMATION_MATCH = /(animation\\s*:)|(animation-name\\s*:)/;\nexport const MEDIA_MATCH = /@media\\s(.*)/;\nexport const IS_VAR = /^--/;\nexport const BRACKETED = /\\{[^}]*\\}/g;\nexport const HOST_PREFIX = '(?:^|[^.#[:])';\nexport const HOST_SUFFIX = '($|[.:[\\\\s>+~])';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {!Set<string>} */\nconst styleTextSet = new Set();\n\nexport const scopingAttribute = 'shady-unscoped';\n\n/**\n * Add a specifically-marked style to the document directly, and only one copy of that style.\n *\n * @param {!HTMLStyleElement} style\n * @return {undefined}\n */\nexport function processUnscopedStyle(style) {\n  const text = style.textContent;\n  if (!styleTextSet.has(text)) {\n    styleTextSet.add(text);\n    const newStyle = style.cloneNode(true);\n    document.head.appendChild(newStyle);\n  }\n}\n\n/**\n * Check if a style is supposed to be unscoped\n * @param {!HTMLStyleElement} style\n * @return {boolean} true if the style has the unscoping attribute\n */\nexport function isUnscopedStyle(style) {\n  return style.hasAttribute(scopingAttribute);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow, nativeCssVariables} from './style-settings.js';\nimport {parse, stringify, types, StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport {MEDIA_MATCH} from './common-regex.js';\nimport {processUnscopedStyle, isUnscopedStyle} from './unscoped-style-handler.js';\n\n/**\n * @param {string|StyleNode} rules\n * @param {function(StyleNode)=} callback\n * @return {string}\n */\nexport function toCssText (rules, callback) {\n  if (!rules) {\n    return '';\n  }\n  if (typeof rules === 'string') {\n    rules = parse(rules);\n  }\n  if (callback) {\n    forEachRule(rules, callback);\n  }\n  return stringify(rules, nativeCssVariables);\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @return {StyleNode}\n */\nexport function rulesForStyle(style) {\n  if (!style['__cssRules'] && style.textContent) {\n    style['__cssRules'] = parse(style.textContent);\n  }\n  return style['__cssRules'] || null;\n}\n\n// Tests if a rule is a keyframes selector, which looks almost exactly\n// like a normal selector but is not (it has nothing to do with scoping\n// for example).\n/**\n * @param {StyleNode} rule\n * @return {boolean}\n */\nexport function isKeyframesSelector(rule) {\n  return Boolean(rule['parent']) &&\n  rule['parent']['type'] === types.KEYFRAMES_RULE;\n}\n\n/**\n * @param {StyleNode} node\n * @param {Function=} styleRuleCallback\n * @param {Function=} keyframesRuleCallback\n * @param {boolean=} onlyActiveRules\n */\nexport function forEachRule(node, styleRuleCallback, keyframesRuleCallback, onlyActiveRules) {\n  if (!node) {\n    return;\n  }\n  let skipRules = false;\n  let type = node['type'];\n  if (onlyActiveRules) {\n    if (type === types.MEDIA_RULE) {\n      let matchMedia = node['selector'].match(MEDIA_MATCH);\n      if (matchMedia) {\n        // if rule is a non matching @media rule, skip subrules\n        if (!window.matchMedia(matchMedia[1]).matches) {\n          skipRules = true;\n        }\n      }\n    }\n  }\n  if (type === types.STYLE_RULE) {\n    styleRuleCallback(node);\n  } else if (keyframesRuleCallback &&\n    type === types.KEYFRAMES_RULE) {\n    keyframesRuleCallback(node);\n  } else if (type === types.MIXIN_RULE) {\n    skipRules = true;\n  }\n  let r$ = node['rules'];\n  if (r$ && !skipRules) {\n    for (let i=0, l=r$.length, r; (i<l) && (r=r$[i]); i++) {\n      forEachRule(r, styleRuleCallback, keyframesRuleCallback, onlyActiveRules);\n    }\n  }\n}\n\n// add a string of cssText to the document.\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @param {Node} target\n * @param {Node} contextNode\n * @return {HTMLStyleElement}\n */\nexport function applyCss(cssText, moniker, target, contextNode) {\n  let style = createScopeStyle(cssText, moniker);\n  applyStyle(style, target, contextNode);\n  return style;\n}\n\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @return {HTMLStyleElement}\n */\nexport function createScopeStyle(cssText, moniker) {\n  let style = /** @type {HTMLStyleElement} */(document.createElement('style'));\n  if (moniker) {\n    style.setAttribute('scope', moniker);\n  }\n  style.textContent = cssText;\n  return style;\n}\n\n/**\n * Track the position of the last added style for placing placeholders\n * @type {Node}\n */\nlet lastHeadApplyNode = null;\n\n// insert a comment node as a styling position placeholder.\n/**\n * @param {string} moniker\n * @return {!Comment}\n */\nexport function applyStylePlaceHolder(moniker) {\n  let placeHolder = document.createComment(' Shady DOM styles for ' +\n    moniker + ' ');\n  let after = lastHeadApplyNode ?\n    lastHeadApplyNode['nextSibling'] : null;\n  let scope = document.head;\n  scope.insertBefore(placeHolder, after || scope.firstChild);\n  lastHeadApplyNode = placeHolder;\n  return placeHolder;\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @param {?Node} target\n * @param {?Node} contextNode\n */\nexport function applyStyle(style, target, contextNode) {\n  target = target || document.head;\n  let after = (contextNode && contextNode.nextSibling) ||\n    target.firstChild;\n  target.insertBefore(style, after);\n  if (!lastHeadApplyNode) {\n    lastHeadApplyNode = style;\n  } else {\n    // only update lastHeadApplyNode if the new style is inserted after the old lastHeadApplyNode\n    let position = style.compareDocumentPosition(lastHeadApplyNode);\n    if (position === Node.DOCUMENT_POSITION_PRECEDING) {\n      lastHeadApplyNode = style;\n    }\n  }\n}\n\n/**\n * @param {string} buildType\n * @return {boolean}\n */\nexport function isTargetedBuild(buildType) {\n  return nativeShadow ? buildType === 'shadow' : buildType === 'shady';\n}\n\n/**\n * @param {Element} element\n * @return {?string}\n */\nexport function getCssBuildType(element) {\n  return element.getAttribute('css-build');\n}\n\n/**\n * Walk from text[start] matching parens and\n * returns position of the outer end paren\n * @param {string} text\n * @param {number} start\n * @return {number}\n */\nfunction findMatchingParen(text, start) {\n  let level = 0;\n  for (let i=start, l=text.length; i < l; i++) {\n    if (text[i] === '(') {\n      level++;\n    } else if (text[i] === ')') {\n      if (--level === 0) {\n        return i;\n      }\n    }\n  }\n  return -1;\n}\n\n/**\n * @param {string} str\n * @param {function(string, string, string, string)} callback\n */\nexport function processVariableAndFallback(str, callback) {\n  // find 'var('\n  let start = str.indexOf('var(');\n  if (start === -1) {\n    // no var?, everything is prefix\n    return callback(str, '', '', '');\n  }\n  //${prefix}var(${inner})${suffix}\n  let end = findMatchingParen(str, start + 3);\n  let inner = str.substring(start + 4, end);\n  let prefix = str.substring(0, start);\n  // suffix may have other variables\n  let suffix = processVariableAndFallback(str.substring(end + 1), callback);\n  let comma = inner.indexOf(',');\n  // value and fallback args should be trimmed to match in property lookup\n  if (comma === -1) {\n    // variable, no fallback\n    return callback(prefix, inner.trim(), '', suffix);\n  }\n  // var(${value},${fallback})\n  let value = inner.substring(0, comma).trim();\n  let fallback = inner.substring(comma + 1).trim();\n  return callback(prefix, value, fallback, suffix);\n}\n\n/**\n * @param {Element} element\n * @param {string} value\n */\nexport function setElementClassRaw(element, value) {\n  // use native setAttribute provided by ShadyDOM when setAttribute is patched\n  if (nativeShadow) {\n    element.setAttribute('class', value);\n  } else {\n    window['ShadyDOM']['nativeMethods']['setAttribute'].call(element, 'class', value);\n  }\n}\n\n/**\n * @param {Element | {is: string, extends: string}} element\n * @return {{is: string, typeExtension: string}}\n */\nexport function getIsExtends(element) {\n  let localName = element['localName'];\n  let is = '', typeExtension = '';\n  /*\n  NOTE: technically, this can be wrong for certain svg elements\n  with `-` in the name like `<font-face>`\n  */\n  if (localName) {\n    if (localName.indexOf('-') > -1) {\n      is = localName;\n    } else {\n      typeExtension = localName;\n      is = (element.getAttribute && element.getAttribute('is')) || '';\n    }\n  } else {\n    is = /** @type {?} */(element).is;\n    typeExtension = /** @type {?} */(element).extends;\n  }\n  return {is, typeExtension};\n}\n\n/**\n * @param {Element|DocumentFragment} element\n * @return {string}\n */\nexport function gatherStyleText(element) {\n  /** @type {!Array<string>} */\n  const styleTextParts = [];\n  const styles = /** @type {!NodeList<!HTMLStyleElement>} */(element.querySelectorAll('style'));\n  for (let i = 0; i < styles.length; i++) {\n    const style = styles[i];\n    if (isUnscopedStyle(style)) {\n      if (!nativeShadow) {\n        processUnscopedStyle(style);\n        style.parentNode.removeChild(style);\n      }\n    } else {\n      styleTextParts.push(style.textContent);\n      style.parentNode.removeChild(style);\n    }\n  }\n  return styleTextParts.join('').trim();\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport * as StyleUtil from './style-util.js';\nimport {nativeShadow} from './style-settings.js';\n\n/* Transforms ShadowDOM styling into ShadyDOM styling\n\n* scoping:\n\n  * elements in scope get scoping selector class=\"x-foo-scope\"\n  * selectors re-written as follows:\n\n    div button -> div.x-foo-scope button.x-foo-scope\n\n* :host -> scopeName\n\n* :host(...) -> scopeName...\n\n* ::slotted(...) -> scopeName > ...\n\n* ...:dir(ltr|rtl) -> [dir=\"ltr|rtl\"] ..., ...[dir=\"ltr|rtl\"]\n\n* :host(:dir[rtl]) -> scopeName:dir(rtl) -> [dir=\"rtl\"] scopeName, scopeName[dir=\"rtl\"]\n\n*/\nconst SCOPE_NAME = 'style-scope';\n\nclass StyleTransformer {\n  get SCOPE_NAME() {\n    return SCOPE_NAME;\n  }\n  // Given a node and scope name, add a scoping class to each node\n  // in the tree. This facilitates transforming css into scoped rules.\n  dom(node, scope, shouldRemoveScope) {\n    // one time optimization to skip scoping...\n    if (node['__styleScoped']) {\n      node['__styleScoped'] = null;\n    } else {\n      this._transformDom(node, scope || '', shouldRemoveScope);\n    }\n  }\n\n  _transformDom(node, selector, shouldRemoveScope) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      this.element(node, selector, shouldRemoveScope);\n    }\n    let c$ = (node.localName === 'template') ?\n      (node.content || node._content).childNodes :\n      node.children || node.childNodes;\n    if (c$) {\n      for (let i=0; i<c$.length; i++) {\n        this._transformDom(c$[i], selector, shouldRemoveScope);\n      }\n    }\n  }\n\n  element(element, scope, shouldRemoveScope) {\n    // note: if using classes, we add both the general 'style-scope' class\n    // as well as the specific scope. This enables easy filtering of all\n    // `style-scope` elements\n    if (scope) {\n      // note: svg on IE does not have classList so fallback to class\n      if (element.classList) {\n        if (shouldRemoveScope) {\n          element.classList.remove(SCOPE_NAME);\n          element.classList.remove(scope);\n        } else {\n          element.classList.add(SCOPE_NAME);\n          element.classList.add(scope);\n        }\n      } else if (element.getAttribute) {\n        let c = element.getAttribute(CLASS);\n        if (shouldRemoveScope) {\n          if (c) {\n            let newValue = c.replace(SCOPE_NAME, '').replace(scope, '');\n            StyleUtil.setElementClassRaw(element, newValue);\n          }\n        } else {\n          let newValue = (c ? c + ' ' : '') + SCOPE_NAME + ' ' + scope;\n          StyleUtil.setElementClassRaw(element, newValue);\n        }\n      }\n    }\n  }\n\n  elementStyles(element, styleRules, callback) {\n    let cssBuildType = element['__cssBuild'];\n    // no need to shim selectors if settings.useNativeShadow, also\n    // a shady css build will already have transformed selectors\n    // NOTE: This method may be called as part of static or property shimming.\n    // When there is a targeted build it will not be called for static shimming,\n    // but when the property shim is used it is called and should opt out of\n    // static shimming work when a proper build exists.\n    let cssText = '';\n    if (nativeShadow || cssBuildType === 'shady') {\n      cssText = StyleUtil.toCssText(styleRules, callback);\n    } else {\n      let {is, typeExtension} = StyleUtil.getIsExtends(element);\n      cssText = this.css(styleRules, is, typeExtension, callback) + '\\n\\n';\n    }\n    return cssText.trim();\n  }\n\n  // Given a string of cssText and a scoping string (scope), returns\n  // a string of scoped css where each selector is transformed to include\n  // a class created from the scope. ShadowDOM selectors are also transformed\n  // (e.g. :host) to use the scoping selector.\n  css(rules, scope, ext, callback) {\n    let hostScope = this._calcHostScope(scope, ext);\n    scope = this._calcElementScope(scope);\n    let self = this;\n    return StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      if (!rule.isScoped) {\n        self.rule(rule, scope, hostScope);\n        rule.isScoped = true;\n      }\n      if (callback) {\n        callback(rule, scope, hostScope);\n      }\n    });\n  }\n\n  _calcElementScope(scope) {\n    if (scope) {\n      return CSS_CLASS_PREFIX + scope;\n    } else {\n      return '';\n    }\n  }\n\n  _calcHostScope(scope, ext) {\n    return ext ? `[is=${scope}]` : scope;\n  }\n\n  rule(rule, scope, hostScope) {\n    this._transformRule(rule, this._transformComplexSelector,\n      scope, hostScope);\n  }\n\n  /**\n   * transforms a css rule to a scoped rule.\n   *\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRule(rule, transformer, scope, hostScope) {\n    // NOTE: save transformedSelector for subsequent matching of elements\n    // against selectors (e.g. when calculating style properties)\n    rule['selector'] = rule.transformedSelector =\n      this._transformRuleCss(rule, transformer, scope, hostScope);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRuleCss(rule, transformer, scope, hostScope) {\n    let p$ = rule['selector'].split(COMPLEX_SELECTOR_SEP);\n    // we want to skip transformation of rules that appear in keyframes,\n    // because they are keyframe selectors, not element selectors.\n    if (!StyleUtil.isKeyframesSelector(rule)) {\n      for (let i=0, l=p$.length, p; (i<l) && (p=p$[i]); i++) {\n        p$[i] = transformer.call(this, p, scope, hostScope);\n      }\n    }\n    return p$.join(COMPLEX_SELECTOR_SEP);\n  }\n\n  /**\n   * @param {string} selector\n   * @return {string}\n   */\n  _twiddleNthPlus(selector) {\n    return selector.replace(NTH, (m, type, inside) => {\n      if (inside.indexOf('+') > -1) {\n        inside = inside.replace(/\\+/g, '___');\n      } else if (inside.indexOf('___') > -1) {\n        inside = inside.replace(/___/g, '+');\n      }\n      return `:${type}(${inside})`;\n    });\n  }\n\n/**\n * @param {string} selector\n * @param {string} scope\n * @param {string=} hostScope\n */\n  _transformComplexSelector(selector, scope, hostScope) {\n    let stop = false;\n    selector = selector.trim();\n    // Remove spaces inside of selectors like `:nth-of-type` because it confuses SIMPLE_SELECTOR_SEP\n    let isNth = NTH.test(selector);\n    if (isNth) {\n      selector = selector.replace(NTH, (m, type, inner) => `:${type}(${inner.replace(/\\s/g, '')})`)\n      selector = this._twiddleNthPlus(selector);\n    }\n    selector = selector.replace(SLOTTED_START, `${HOST} $1`);\n    selector = selector.replace(SIMPLE_SELECTOR_SEP, (m, c, s) => {\n      if (!stop) {\n        let info = this._transformCompoundSelector(s, c, scope, hostScope);\n        stop = stop || info.stop;\n        c = info.combinator;\n        s = info.value;\n      }\n      return c + s;\n    });\n    if (isNth) {\n      selector = this._twiddleNthPlus(selector);\n    }\n    return selector;\n  }\n\n  _transformCompoundSelector(selector, combinator, scope, hostScope) {\n    // replace :host with host scoping class\n    let slottedIndex = selector.indexOf(SLOTTED);\n    if (selector.indexOf(HOST) >= 0) {\n      selector = this._transformHostSelector(selector, hostScope);\n    // replace other selectors with scoping class\n    } else if (slottedIndex !== 0) {\n      selector = scope ? this._transformSimpleSelector(selector, scope) :\n        selector;\n    }\n    // mark ::slotted() scope jump to replace with descendant selector + arg\n    // also ignore left-side combinator\n    let slotted = false;\n    if (slottedIndex >= 0) {\n      combinator = '';\n      slotted = true;\n    }\n    // process scope jumping selectors up to the scope jump and then stop\n    let stop;\n    if (slotted) {\n      stop = true;\n      if (slotted) {\n        // .zonk ::slotted(.foo) -> .zonk.scope > .foo\n        selector = selector.replace(SLOTTED_PAREN, (m, paren) => ` > ${paren}`);\n      }\n    }\n    selector = selector.replace(DIR_PAREN, (m, before, dir) =>\n      `[dir=\"${dir}\"] ${before}, ${before}[dir=\"${dir}\"]`);\n    return {value: selector, combinator, stop};\n  }\n\n  _transformSimpleSelector(selector, scope) {\n    let p$ = selector.split(PSEUDO_PREFIX);\n    p$[0] += scope;\n    return p$.join(PSEUDO_PREFIX);\n  }\n\n  // :host(...) -> scopeName...\n  _transformHostSelector(selector, hostScope) {\n    let m = selector.match(HOST_PAREN);\n    let paren = m && m[2].trim() || '';\n    if (paren) {\n      if (!paren[0].match(SIMPLE_SELECTOR_PREFIX)) {\n        // paren starts with a type selector\n        let typeSelector = paren.split(SIMPLE_SELECTOR_PREFIX)[0];\n        // if the type selector is our hostScope then avoid pre-pending it\n        if (typeSelector === hostScope) {\n          return paren;\n        // otherwise, this selector should not match in this scope so\n        // output a bogus selector.\n        } else {\n          return SELECTOR_NO_MATCH;\n        }\n      } else {\n        // make sure to do a replace here to catch selectors like:\n        // `:host(.foo)::before`\n        return selector.replace(HOST_PAREN, function(m, host, paren) {\n          return hostScope + paren;\n        });\n      }\n    // if no paren, do a straight :host replacement.\n    // TODO(sorvell): this should not strictly be necessary but\n    // it's needed to maintain support for `:host[foo]` type selectors\n    // which have been improperly used under Shady DOM. This should be\n    // deprecated.\n    } else {\n      return selector.replace(HOST, hostScope);\n    }\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  documentRule(rule) {\n    // reset selector in case this is redone.\n    rule['selector'] = rule['parsedSelector'];\n    this.normalizeRootSelector(rule);\n    this._transformRule(rule, this._transformDocumentSelector);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  normalizeRootSelector(rule) {\n    if (rule['selector'] === ROOT) {\n      rule['selector'] = 'html';\n    }\n  }\n\n/**\n * @param {string} selector\n */\n  _transformDocumentSelector(selector) {\n    return selector.match(SLOTTED) ?\n      this._transformComplexSelector(selector, SCOPE_DOC_SELECTOR) :\n      this._transformSimpleSelector(selector.trim(), SCOPE_DOC_SELECTOR);\n  }\n}\n\nlet NTH = /:(nth[-\\w]+)\\(([^)]+)\\)/;\nlet SCOPE_DOC_SELECTOR = `:not(.${SCOPE_NAME})`;\nlet COMPLEX_SELECTOR_SEP = ',';\nlet SIMPLE_SELECTOR_SEP = /(^|[\\s>+~]+)((?:\\[.+?\\]|[^\\s>+~=[])+)/g;\nlet SIMPLE_SELECTOR_PREFIX = /[[.:#*]/;\nlet HOST = ':host';\nlet ROOT = ':root';\nlet SLOTTED = '::slotted';\nlet SLOTTED_START = new RegExp(`^(${SLOTTED})`);\n// NOTE: this supports 1 nested () pair for things like\n// :host(:not([selected]), more general support requires\n// parsing which seems like overkill\nlet HOST_PAREN = /(:host)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\n// similar to HOST_PAREN\nlet SLOTTED_PAREN = /(?:::slotted)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\nlet DIR_PAREN = /(.*):dir\\((?:(ltr|rtl))\\)/;\nlet CSS_CLASS_PREFIX = '.';\nlet PSEUDO_PREFIX = ':';\nlet CLASS = 'class';\nlet SELECTOR_NO_MATCH = 'should_not_match';\n\nexport default new StyleTransformer()","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\n/** @const {string} */\nconst infoKey = '__styleInfo';\n\nexport default class StyleInfo {\n  /**\n   * @param {Element} node\n   * @return {StyleInfo}\n   */\n  static get(node) {\n    if (node) {\n      return node[infoKey];\n    } else {\n      return null;\n    }\n  }\n  /**\n   * @param {!Element} node\n   * @param {StyleInfo} styleInfo\n   * @return {StyleInfo}\n   */\n  static set(node, styleInfo) {\n    node[infoKey] = styleInfo;\n    return styleInfo;\n  }\n  /**\n   * @param {StyleNode} ast\n   * @param {Node=} placeholder\n   * @param {Array<string>=} ownStylePropertyNames\n   * @param {string=} elementName\n   * @param {string=} typeExtension\n   * @param {string=} cssBuild\n   */\n  constructor(ast, placeholder, ownStylePropertyNames, elementName, typeExtension, cssBuild) {\n    /** @type {StyleNode} */\n    this.styleRules = ast || null;\n    /** @type {Node} */\n    this.placeholder = placeholder || null;\n    /** @type {!Array<string>} */\n    this.ownStylePropertyNames = ownStylePropertyNames || [];\n    /** @type {Array<Object>} */\n    this.overrideStyleProperties = null;\n    /** @type {string} */\n    this.elementName = elementName || '';\n    /** @type {string} */\n    this.cssBuild = cssBuild || '';\n    /** @type {string} */\n    this.typeExtension = typeExtension || '';\n    /** @type {Object<string, string>} */\n    this.styleProperties = null;\n    /** @type {?string} */\n    this.scopeSelector = null;\n    /** @type {HTMLStyleElement} */\n    this.customStyle = null;\n  }\n  _getStyleRules() {\n    return this.styleRules;\n  }\n}\n\nStyleInfo.prototype['_getStyleRules'] = StyleInfo.prototype._getStyleRules;","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {removeCustomPropAssignment, StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport {nativeShadow} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport * as StyleUtil from './style-util.js';\nimport * as RX from './common-regex.js';\nimport StyleInfo from './style-info.js';\n\n// TODO: dedupe with shady\n/**\n * @const {function(string):boolean}\n */\nconst matchesSelector = ((p) => p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\np.oMatchesSelector || p.webkitMatchesSelector)(window.Element.prototype);\n\nconst IS_IE = navigator.userAgent.match('Trident');\n\nconst XSCOPE_NAME = 'x-scope';\n\nclass StyleProperties {\n  get XSCOPE_NAME() {\n    return XSCOPE_NAME;\n  }\n/**\n * decorates styles with rule info and returns an array of used style property names\n *\n * @param {StyleNode} rules\n * @return {Array<string>}\n */\n  decorateStyles(rules) {\n    let self = this, props = {}, keyframes = [], ruleIndex = 0;\n    StyleUtil.forEachRule(rules, function(rule) {\n      self.decorateRule(rule);\n      // mark in-order position of ast rule in styles block, used for cache key\n      rule.index = ruleIndex++;\n      self.collectPropertiesInCssText(rule.propertyInfo.cssText, props);\n    }, function onKeyframesRule(rule) {\n      keyframes.push(rule);\n    });\n    // Cache all found keyframes rules for later reference:\n    rules._keyframes = keyframes;\n    // return this list of property names *consumes* in these styles.\n    let names = [];\n    for (let i in props) {\n      names.push(i);\n    }\n    return names;\n  }\n\n  // decorate a single rule with property info\n  decorateRule(rule) {\n    if (rule.propertyInfo) {\n      return rule.propertyInfo;\n    }\n    let info = {}, properties = {};\n    let hasProperties = this.collectProperties(rule, properties);\n    if (hasProperties) {\n      info.properties = properties;\n      // TODO(sorvell): workaround parser seeing mixins as additional rules\n      rule['rules'] = null;\n    }\n    info.cssText = this.collectCssText(rule);\n    rule.propertyInfo = info;\n    return info;\n  }\n\n  // collects the custom properties from a rule's cssText\n  collectProperties(rule, properties) {\n    let info = rule.propertyInfo;\n    if (info) {\n      if (info.properties) {\n        Object.assign(properties, info.properties);\n        return true;\n      }\n    } else {\n      let m, rx = RX.VAR_ASSIGN;\n      let cssText = rule['parsedCssText'];\n      let value;\n      let any;\n      while ((m = rx.exec(cssText))) {\n        // note: group 2 is var, 3 is mixin\n        value = (m[2] || m[3]).trim();\n        // value of 'inherit' or 'unset' is equivalent to not setting the property here\n        if (value !== 'inherit' || value !== 'unset') {\n          properties[m[1].trim()] = value;\n        }\n        any = true;\n      }\n      return any;\n    }\n\n  }\n\n  // returns cssText of properties that consume variables/mixins\n  collectCssText(rule) {\n    return this.collectConsumingCssText(rule['parsedCssText']);\n  }\n\n  // NOTE: we support consumption inside mixin assignment\n  // but not production, so strip out {...}\n  collectConsumingCssText(cssText) {\n    return cssText.replace(RX.BRACKETED, '')\n      .replace(RX.VAR_ASSIGN, '');\n  }\n\n  collectPropertiesInCssText(cssText, props) {\n    let m;\n    while ((m = RX.VAR_CONSUMED.exec(cssText))) {\n      let name = m[1];\n      // This regex catches all variable names, and following non-whitespace char\n      // If next char is not ':', then variable is a consumer\n      if (m[2] !== ':') {\n        props[name] = true;\n      }\n    }\n  }\n\n  // turns custom properties into realized values.\n  reify(props) {\n    // big perf optimization here: reify only *own* properties\n    // since this object has __proto__ of the element's scope properties\n    let names = Object.getOwnPropertyNames(props);\n    for (let i=0, n; i < names.length; i++) {\n      n = names[i];\n      props[n] = this.valueForProperty(props[n], props);\n    }\n  }\n\n  // given a property value, returns the reified value\n  // a property value may be:\n  // (1) a literal value like: red or 5px;\n  // (2) a variable value like: var(--a), var(--a, red), or var(--a, --b) or\n  // var(--a, var(--b));\n  // (3) a literal mixin value like { properties }. Each of these properties\n  // can have values that are: (a) literal, (b) variables, (c) @apply mixins.\n  valueForProperty(property, props) {\n    // case (1) default\n    // case (3) defines a mixin and we have to reify the internals\n    if (property) {\n      if (property.indexOf(';') >=0) {\n        property = this.valueForProperties(property, props);\n      } else {\n        // case (2) variable\n        let self = this;\n        let fn = function(prefix, value, fallback, suffix) {\n          if (!value) {\n            return prefix + suffix;\n          }\n          let propertyValue = self.valueForProperty(props[value], props);\n          // if value is \"initial\", then the variable should be treated as unset\n          if (!propertyValue || propertyValue === 'initial') {\n            // fallback may be --a or var(--a) or literal\n            propertyValue = self.valueForProperty(props[fallback] || fallback, props) ||\n            fallback;\n          } else if (propertyValue === 'apply-shim-inherit') {\n            // CSS build will replace `inherit` with `apply-shim-inherit`\n            // for use with native css variables.\n            // Since we have full control, we can use `inherit` directly.\n            propertyValue = 'inherit';\n          }\n          return prefix + (propertyValue || '') + suffix;\n        };\n        property = StyleUtil.processVariableAndFallback(property, fn);\n      }\n    }\n    return property && property.trim() || '';\n  }\n\n  // note: we do not yet support mixin within mixin\n  valueForProperties(property, props) {\n    let parts = property.split(';');\n    for (let i=0, p, m; i<parts.length; i++) {\n      if ((p = parts[i])) {\n        RX.MIXIN_MATCH.lastIndex = 0;\n        m = RX.MIXIN_MATCH.exec(p);\n        if (m) {\n          p = this.valueForProperty(props[m[1]], props);\n        } else {\n          let colon = p.indexOf(':');\n          if (colon !== -1) {\n            let pp = p.substring(colon);\n            pp = pp.trim();\n            pp = this.valueForProperty(pp, props) || pp;\n            p = p.substring(0, colon) + pp;\n          }\n        }\n        parts[i] = (p && p.lastIndexOf(';') === p.length - 1) ?\n          // strip trailing ;\n          p.slice(0, -1) :\n          p || '';\n      }\n    }\n    return parts.join(';');\n  }\n\n  applyProperties(rule, props) {\n    let output = '';\n    // dynamically added sheets may not be decorated so ensure they are.\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (rule.propertyInfo.cssText) {\n      output = this.valueForProperties(rule.propertyInfo.cssText, props);\n    }\n    rule['cssText'] = output;\n  }\n\n  // Apply keyframe transformations to the cssText of a given rule. The\n  // keyframeTransforms object is a map of keyframe names to transformer\n  // functions which take in cssText and spit out transformed cssText.\n  applyKeyframeTransforms(rule, keyframeTransforms) {\n    let input = rule['cssText'];\n    let output = rule['cssText'];\n    if (rule.hasAnimations == null) {\n      // Cache whether or not the rule has any animations to begin with:\n      rule.hasAnimations = RX.ANIMATION_MATCH.test(input);\n    }\n    // If there are no animations referenced, we can skip transforms:\n    if (rule.hasAnimations) {\n      let transform;\n      // If we haven't transformed this rule before, we iterate over all\n      // transforms:\n      if (rule.keyframeNamesToTransform == null) {\n        rule.keyframeNamesToTransform = [];\n        for (let keyframe in keyframeTransforms) {\n          transform = keyframeTransforms[keyframe];\n          output = transform(input);\n          // If the transform actually changed the CSS text, we cache the\n          // transform name for future use:\n          if (input !== output) {\n            input = output;\n            rule.keyframeNamesToTransform.push(keyframe);\n          }\n        }\n      } else {\n        // If we already have a list of keyframe names that apply to this\n        // rule, we apply only those keyframe name transforms:\n        for (let i = 0; i < rule.keyframeNamesToTransform.length; ++i) {\n          transform = keyframeTransforms[rule.keyframeNamesToTransform[i]];\n          input = transform(input);\n        }\n        output = input;\n      }\n    }\n    rule['cssText'] = output;\n  }\n\n  // Test if the rules in these styles matches the given `element` and if so,\n  // collect any custom properties into `props`.\n  /**\n   * @param {StyleNode} rules\n   * @param {Element} element\n   */\n  propertyDataFromStyles(rules, element) {\n    let props = {}, self = this;\n    // generates a unique key for these matches\n    let o = [];\n    // note: active rules excludes non-matching @media rules\n    StyleUtil.forEachRule(rules, function(rule) {\n      // TODO(sorvell): we could trim the set of rules at declaration\n      // time to only include ones that have properties\n      if (!rule.propertyInfo) {\n        self.decorateRule(rule);\n      }\n      // match element against transformedSelector: selector may contain\n      // unwanted uniquification and parsedSelector does not directly match\n      // for :host selectors.\n      let selectorToMatch = rule.transformedSelector || rule['parsedSelector'];\n      if (element && rule.propertyInfo.properties && selectorToMatch) {\n        if (matchesSelector.call(element, selectorToMatch)) {\n          self.collectProperties(rule, props);\n          // produce numeric key for these matches for lookup\n          addToBitMask(rule.index, o);\n        }\n      }\n    }, null, true);\n    return {properties: props, key: o};\n  }\n\n  /**\n   * @param {Element} scope\n   * @param {StyleNode} rule\n   * @param {string|undefined} cssBuild\n   * @param {function(Object)} callback\n   */\n  whenHostOrRootRule(scope, rule, cssBuild, callback) {\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (!rule.propertyInfo.properties) {\n      return;\n    }\n    let {is, typeExtension} = StyleUtil.getIsExtends(scope);\n    let hostScope = is ?\n      StyleTransformer._calcHostScope(is, typeExtension) :\n      'html';\n    let parsedSelector = rule['parsedSelector'];\n    let isRoot = (parsedSelector === ':host > *' || parsedSelector === 'html');\n    let isHost = parsedSelector.indexOf(':host') === 0 && !isRoot;\n    // build info is either in scope (when scope is an element) or in the style\n    // when scope is the default scope; note: this allows default scope to have\n    // mixed mode built and unbuilt styles.\n    if (cssBuild === 'shady') {\n      // :root -> x-foo > *.x-foo for elements and html for custom-style\n      isRoot = parsedSelector === (hostScope + ' > *.' + hostScope) || parsedSelector.indexOf('html') !== -1;\n      // :host -> x-foo for elements, but sub-rules have .x-foo in them\n      isHost = !isRoot && parsedSelector.indexOf(hostScope) === 0;\n    }\n    if (cssBuild === 'shadow') {\n      isRoot = parsedSelector === ':host > *' || parsedSelector === 'html';\n      isHost = isHost && !isRoot;\n    }\n    if (!isRoot && !isHost) {\n      return;\n    }\n    let selectorToMatch = hostScope;\n    if (isHost) {\n      // need to transform :host under ShadowDOM because `:host` does not work with `matches`\n      if (nativeShadow && !rule.transformedSelector) {\n        // transform :host into a matchable selector\n        rule.transformedSelector =\n        StyleTransformer._transformRuleCss(\n          rule,\n          StyleTransformer._transformComplexSelector,\n          StyleTransformer._calcElementScope(is),\n          hostScope\n        );\n      }\n      selectorToMatch = rule.transformedSelector || hostScope;\n    }\n    callback({\n      selector: selectorToMatch,\n      isHost: isHost,\n      isRoot: isRoot\n    });\n  }\n/**\n * @param {Element} scope\n * @param {StyleNode} rules\n * @return {Object}\n */\n  hostAndRootPropertiesForScope(scope, rules) {\n    let hostProps = {}, rootProps = {}, self = this;\n    // note: active rules excludes non-matching @media rules\n    let cssBuild = rules && rules['__cssBuild'];\n    StyleUtil.forEachRule(rules, function(rule) {\n      // if scope is StyleDefaults, use _element for matchesSelector\n      self.whenHostOrRootRule(scope, rule, cssBuild, function(info) {\n        let element = scope._element || scope;\n        if (matchesSelector.call(element, info.selector)) {\n          if (info.isHost) {\n            self.collectProperties(rule, hostProps);\n          } else {\n            self.collectProperties(rule, rootProps);\n          }\n        }\n      });\n    }, null, true);\n    return {rootProps: rootProps, hostProps: hostProps};\n  }\n\n  /**\n   * @param {Element} element\n   * @param {Object} properties\n   * @param {string} scopeSelector\n   */\n  transformStyles(element, properties, scopeSelector) {\n    let self = this;\n    let {is, typeExtension} = StyleUtil.getIsExtends(element);\n    let hostSelector = StyleTransformer\n      ._calcHostScope(is, typeExtension);\n    let rxHostSelector = element.extends ?\n      '\\\\' + hostSelector.slice(0, -1) + '\\\\]' :\n      hostSelector;\n    let hostRx = new RegExp(RX.HOST_PREFIX + rxHostSelector +\n      RX.HOST_SUFFIX);\n    let rules = StyleInfo.get(element).styleRules;\n    let keyframeTransforms =\n      this._elementKeyframeTransforms(element, rules, scopeSelector);\n    return StyleTransformer.elementStyles(element, rules, function(rule) {\n      self.applyProperties(rule, properties);\n      if (!nativeShadow &&\n          !StyleUtil.isKeyframesSelector(rule) &&\n          rule['cssText']) {\n        // NOTE: keyframe transforms only scope munge animation names, so it\n        // is not necessary to apply them in ShadowDOM.\n        self.applyKeyframeTransforms(rule, keyframeTransforms);\n        self._scopeSelector(rule, hostRx, hostSelector, scopeSelector);\n      }\n    });\n  }\n\n  /**\n   * @param {Element} element\n   * @param {StyleNode} rules\n   * @param {string} scopeSelector\n   * @return {Object}\n   */\n  _elementKeyframeTransforms(element, rules, scopeSelector) {\n    let keyframesRules = rules._keyframes;\n    let keyframeTransforms = {};\n    if (!nativeShadow && keyframesRules) {\n      // For non-ShadowDOM, we transform all known keyframes rules in\n      // advance for the current scope. This allows us to catch keyframes\n      // rules that appear anywhere in the stylesheet:\n      for (let i = 0, keyframesRule = keyframesRules[i];\n           i < keyframesRules.length;\n           keyframesRule = keyframesRules[++i]) {\n        this._scopeKeyframes(keyframesRule, scopeSelector);\n        keyframeTransforms[keyframesRule['keyframesName']] =\n            this._keyframesRuleTransformer(keyframesRule);\n      }\n    }\n    return keyframeTransforms;\n  }\n\n  // Generate a factory for transforming a chunk of CSS text to handle a\n  // particular scoped keyframes rule.\n  /**\n   * @param {StyleNode} keyframesRule\n   * @return {function(string):string}\n   */\n  _keyframesRuleTransformer(keyframesRule) {\n    return function(cssText) {\n      return cssText.replace(\n          keyframesRule.keyframesNameRx,\n          keyframesRule.transformedKeyframesName);\n    };\n  }\n\n/**\n * Transforms `@keyframes` names to be unique for the current host.\n * Example: @keyframes foo-anim -> @keyframes foo-anim-x-foo-0\n *\n * @param {StyleNode} rule\n * @param {string} scopeId\n */\n  _scopeKeyframes(rule, scopeId) {\n    // Animation names are of the form [\\w-], so ensure that the name regex does not partially apply\n    // to similarly named keyframe names by checking for a word boundary at the beginning and\n    // a non-word boundary or `-` at the end.\n    rule.keyframesNameRx = new RegExp(`\\\\b${rule['keyframesName']}(?!\\\\B|-)`, 'g');\n    rule.transformedKeyframesName = rule['keyframesName'] + '-' + scopeId;\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    rule['selector'] = rule.transformedSelector.replace(\n        rule['keyframesName'], rule.transformedKeyframesName);\n  }\n\n  // Strategy: x scope shim a selector e.g. to scope `.x-foo-42` (via classes):\n  // non-host selector: .a.x-foo -> .x-foo-42 .a.x-foo\n  // host selector: x-foo.wide -> .x-foo-42.wide\n  // note: we use only the scope class (.x-foo-42) and not the hostSelector\n  // (x-foo) to scope :host rules; this helps make property host rules\n  // have low specificity. They are overrideable by class selectors but,\n  // unfortunately, not by type selectors (e.g. overriding via\n  // `.special` is ok, but not by `x-foo`).\n  /**\n   * @param {StyleNode} rule\n   * @param {RegExp} hostRx\n   * @param {string} hostSelector\n   * @param {string} scopeId\n   */\n  _scopeSelector(rule, hostRx, hostSelector, scopeId) {\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    let selector = rule.transformedSelector;\n    let scope = '.' + scopeId;\n    let parts = selector.split(',');\n    for (let i=0, l=parts.length, p; (i<l) && (p=parts[i]); i++) {\n      parts[i] = p.match(hostRx) ?\n        p.replace(hostSelector, scope) :\n        scope + ' ' + p;\n    }\n    rule['selector'] = parts.join(',');\n  }\n\n  /**\n   * @param {Element} element\n   * @param {string} selector\n   * @param {string} old\n   */\n  applyElementScopeSelector(element, selector, old) {\n    let c = element.getAttribute('class') || '';\n    let v = c;\n    if (old) {\n      v = c.replace(\n        new RegExp('\\\\s*' + XSCOPE_NAME + '\\\\s*' + old + '\\\\s*', 'g'), ' ');\n    }\n    v += (v ? ' ' : '') + XSCOPE_NAME + ' ' + selector;\n    if (c !== v) {\n      StyleUtil.setElementClassRaw(element, v);\n    }\n  }\n\n  /**\n   * @param {HTMLElement} element\n   * @param {Object} properties\n   * @param {string} selector\n   * @param {HTMLStyleElement} style\n   * @return {HTMLStyleElement}\n   */\n  applyElementStyle(element, properties, selector, style) {\n    // calculate cssText to apply\n    let cssText = style ? style.textContent || '' :\n      this.transformStyles(element, properties, selector);\n    // if shady and we have a cached style that is not style, decrement\n    let styleInfo = StyleInfo.get(element);\n    let s = styleInfo.customStyle;\n    if (s && !nativeShadow && (s !== style)) {\n      s['_useCount']--;\n      if (s['_useCount'] <= 0 && s.parentNode) {\n        s.parentNode.removeChild(s);\n      }\n    }\n    // apply styling always under native or if we generated style\n    // or the cached style is not in document(!)\n    if (nativeShadow) {\n      // update existing style only under native\n      if (styleInfo.customStyle) {\n        styleInfo.customStyle.textContent = cssText;\n        style = styleInfo.customStyle;\n      // otherwise, if we have css to apply, do so\n      } else if (cssText) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        style = StyleUtil.applyCss(cssText, selector, element.shadowRoot,\n          styleInfo.placeholder);\n      }\n    } else {\n      // shady and no cache hit\n      if (!style) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        if (cssText) {\n          style = StyleUtil.applyCss(cssText, selector, null,\n            styleInfo.placeholder);\n        }\n      // shady and cache hit but not in document\n      } else if (!style.parentNode) {\n        if (IS_IE && cssText.indexOf('@media') > -1) {\n            // @media rules may be stale in IE 10 and 11\n            // refresh the text content of the style to revalidate them.\n          style.textContent = cssText;\n        }\n        StyleUtil.applyStyle(style, null, styleInfo.placeholder);\n      }\n    }\n    // ensure this style is our custom style and increment its use count.\n    if (style) {\n      style['_useCount'] = style['_useCount'] || 0;\n      // increment use count if we changed styles\n      if (styleInfo.customStyle != style) {\n        style['_useCount']++;\n      }\n      styleInfo.customStyle = style;\n    }\n    return style;\n  }\n\n  /**\n   * @param {Element} style\n   * @param {Object} properties\n   */\n  applyCustomStyle(style, properties) {\n    let rules = StyleUtil.rulesForStyle(/** @type {HTMLStyleElement} */(style));\n    let self = this;\n    style.textContent = StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      let css = rule['cssText'] = rule['parsedCssText'];\n      if (rule.propertyInfo && rule.propertyInfo.cssText) {\n        // remove property assignments\n        // so next function isn't confused\n        // NOTE: we have 3 categories of css:\n        // (1) normal properties,\n        // (2) custom property assignments (--foo: red;),\n        // (3) custom property usage: border: var(--foo); @apply(--foo);\n        // In elements, 1 and 3 are separated for efficiency; here they\n        // are not and this makes this case unique.\n        css = removeCustomPropAssignment(/** @type {string} */(css));\n        // replace with reified properties, scenario is same as mixin\n        rule['cssText'] = self.valueForProperties(css, properties);\n      }\n    });\n  }\n}\n\n/**\n * @param {number} n\n * @param {Array<number>} bits\n */\nfunction addToBitMask(n, bits) {\n  let o = parseInt(n / 32, 10);\n  let v = 1 << (n % 32);\n  bits[o] = (bits[o] || 0) | v;\n}\n\nexport default new StyleProperties();","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {applyStylePlaceHolder} from './style-util.js';\nimport {nativeShadow} from './style-settings.js';\n\n/** @type {Object<string, !Node>} */\nlet placeholderMap = {};\n\n/**\n * @const {CustomElementRegistry}\n */\nconst ce = window['customElements'];\nif (ce && !nativeShadow) {\n  /**\n   * @const {function(this:CustomElementRegistry, string,function(new:HTMLElement),{extends: string}=)}\n   */\n  const origDefine = ce['define'];\n  /**\n   * @param {string} name\n   * @param {function(new:HTMLElement)} clazz\n   * @param {{extends: string}=} options\n   * @return {function(new:HTMLElement)}\n   */\n  const wrappedDefine = (name, clazz, options) => {\n    placeholderMap[name] = applyStylePlaceHolder(name);\n    return origDefine.call(/** @type {!CustomElementRegistry} */(ce), name, clazz, options);\n  }\n  ce['define'] = wrappedDefine;\n}\n\nexport default placeholderMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n'use strict';\n\nexport default class StyleCache {\n  constructor(typeMax = 100) {\n    // map element name -> [{properties, styleElement, scopeSelector}]\n    this.cache = {};\n    this.typeMax = typeMax;\n  }\n\n  _validate(cacheEntry, properties, ownPropertyNames) {\n    for (let idx = 0; idx < ownPropertyNames.length; idx++) {\n      let pn = ownPropertyNames[idx];\n      if (cacheEntry.properties[pn] !== properties[pn]) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  store(tagname, properties, styleElement, scopeSelector) {\n    let list = this.cache[tagname] || [];\n    list.push({properties, styleElement, scopeSelector});\n    if (list.length > this.typeMax) {\n      list.shift();\n    }\n    this.cache[tagname] = list;\n  }\n\n  fetch(tagname, properties, ownPropertyNames) {\n    let list = this.cache[tagname];\n    if (!list) {\n      return;\n    }\n    // reverse list for most-recent lookups\n    for (let idx = list.length - 1; idx >= 0; idx--) {\n      let entry = list[idx];\n      if (this._validate(entry, properties, ownPropertyNames)) {\n        return entry;\n      }\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport {getIsExtends} from './style-util.js';\n\nexport let flush = function() {};\n\n/**\n * @param {HTMLElement} element\n * @return {!Array<string>}\n */\nfunction getClasses(element) {\n  let classes = [];\n  if (element.classList) {\n    classes = Array.from(element.classList);\n  } else if (element instanceof window['SVGElement'] && element.hasAttribute('class')) {\n    classes = element.getAttribute('class').split(/\\s+/);\n  }\n  return classes;\n}\n\n/**\n * @param {HTMLElement} element\n * @return {string}\n */\nfunction getCurrentScope(element) {\n  let classes = getClasses(element);\n  let idx = classes.indexOf(StyleTransformer.SCOPE_NAME);\n  if (idx > -1) {\n    return classes[idx + 1];\n  }\n  return '';\n}\n\n/**\n * @param {Array<MutationRecord|null>|null} mxns\n */\nfunction handler(mxns) {\n  for (let x=0; x < mxns.length; x++) {\n    let mxn = mxns[x];\n    if (mxn.target === document.documentElement ||\n      mxn.target === document.head) {\n      continue;\n    }\n    for (let i=0; i < mxn.addedNodes.length; i++) {\n      let n = mxn.addedNodes[i];\n      if (n.nodeType !== Node.ELEMENT_NODE) {\n        continue;\n      }\n      n = /** @type {HTMLElement} */(n); // eslint-disable-line no-self-assign\n      let root = n.getRootNode();\n      let currentScope = getCurrentScope(n);\n      // node was scoped, but now is in document\n      if (currentScope && root === n.ownerDocument) {\n        StyleTransformer.dom(n, currentScope, true);\n      } else if (root.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n        let newScope;\n        let host = /** @type {ShadowRoot} */(root).host;\n        // element may no longer be in a shadowroot\n        if (!host) {\n          continue;\n        }\n        newScope = getIsExtends(host).is;\n        if (currentScope === newScope) {\n          // make sure all the subtree elements are scoped correctly\n          let unscoped = window['ShadyDOM']['nativeMethods']['querySelectorAll'].call(\n            n, `:not(.${StyleTransformer.SCOPE_NAME})`);\n          for (let j = 0; j < unscoped.length; j++) {\n            StyleTransformer.element(unscoped[j], currentScope);\n          }\n          continue;\n        }\n        if (currentScope) {\n          StyleTransformer.dom(n, currentScope, true);\n        }\n        StyleTransformer.dom(n, newScope);\n      }\n    }\n  }\n}\n\nif (!nativeShadow) {\n  let observer = new MutationObserver(handler);\n  let start = (node) => {\n    observer.observe(node, {childList: true, subtree: true});\n  }\n  let nativeCustomElements = (window['customElements'] &&\n    !window['customElements']['polyfillWrapFlushCallback']);\n  // need to start immediately with native custom elements\n  // TODO(dfreedm): with polyfilled HTMLImports and native custom elements\n  // excessive mutations may be observed; this can be optimized via cooperation\n  // with the HTMLImports polyfill.\n  if (nativeCustomElements) {\n    start(document);\n  } else {\n    let delayedStart = () => {\n      start(document.body);\n    }\n    // use polyfill timing if it's available\n    if (window['HTMLImports']) {\n      window['HTMLImports']['whenReady'](delayedStart);\n    // otherwise push beyond native imports being ready\n    // which requires RAF + readystate interactive.\n    } else {\n      requestAnimationFrame(function() {\n        if (document.readyState === 'loading') {\n          let listener = function() {\n            delayedStart();\n            document.removeEventListener('readystatechange', listener);\n          }\n          document.addEventListener('readystatechange', listener);\n        } else {\n          delayedStart();\n        }\n      });\n    }\n  }\n\n  flush = function() {\n    handler(observer.takeRecords());\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/**\n * @const {!Object<string, !HTMLTemplateElement>}\n */\nconst templateMap = {};\nexport default templateMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\nimport templateMap from './template-map.js';\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\n/*\n * Utilities for handling invalidating apply-shim mixins for a given template.\n *\n * The invalidation strategy involves keeping track of the \"current\" version of a template's mixins, and updating that count when a mixin is invalidated.\n * The template\n */\n\n/** @const {string} */\nconst CURRENT_VERSION = '_applyShimCurrentVersion';\n\n/** @const {string} */\nconst NEXT_VERSION = '_applyShimNextVersion';\n\n/** @const {string} */\nconst VALIDATING_VERSION = '_applyShimValidatingVersion';\n\n/**\n * @const {Promise<void>}\n */\nconst promise = Promise.resolve();\n\n/**\n * @param {string} elementName\n */\nexport function invalidate(elementName){\n  let template = templateMap[elementName];\n  if (template) {\n    invalidateTemplate(template);\n  }\n}\n\n/**\n * This function can be called multiple times to mark a template invalid\n * and signal that the style inside must be regenerated.\n *\n * Use `startValidatingTemplate` to begin an asynchronous validation cycle.\n * During that cycle, call `templateIsValidating` to see if the template must\n * be revalidated\n * @param {HTMLTemplateElement} template\n */\nexport function invalidateTemplate(template) {\n  // default the current version to 0\n  template[CURRENT_VERSION] = template[CURRENT_VERSION] || 0;\n  // ensure the \"validating for\" flag exists\n  template[VALIDATING_VERSION] = template[VALIDATING_VERSION] || 0;\n  // increment the next version\n  template[NEXT_VERSION] = (template[NEXT_VERSION] || 0) + 1;\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValid(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValid(template);\n  }\n  return true;\n}\n\n/**\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValid(template) {\n  return template[CURRENT_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValidating(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValidating(template);\n  }\n  return false;\n}\n\n/**\n * Returns true if the template is currently invalid and `startValidating` has been called since the last invalidation.\n * If false, the template must be validated.\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValidating(template) {\n  return !templateIsValid(template) && template[VALIDATING_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * the template is marked as `validating` for one microtask so that all instances\n * found in the tree crawl of `applyStyle` will update themselves,\n * but the template will only be updated once.\n * @param {string} elementName\n*/\nexport function startValidating(elementName) {\n  let template = templateMap[elementName];\n  startValidatingTemplate(template);\n}\n\n/**\n * Begin an asynchronous invalidation cycle.\n * This should be called after every validation of a template\n *\n * After one microtask, the template will be marked as valid until the next call to `invalidateTemplate`\n * @param {HTMLTemplateElement} template\n */\nexport function startValidatingTemplate(template) {\n  // remember that the current \"next version\" is the reason for this validation cycle\n  template[VALIDATING_VERSION] = template[NEXT_VERSION];\n  // however, there only needs to be one async task to clear the counters\n  if (!template._validating) {\n    template._validating = true;\n    promise.then(function() {\n      // sync the current version to let future invalidations cause a refresh cycle\n      template[CURRENT_VERSION] = template[NEXT_VERSION];\n      template._validating = false;\n    });\n  }\n}\n\n/**\n * @return {boolean}\n */\nexport function elementsAreInvalid() {\n  for (let elementName in templateMap) {\n    let template = templateMap[elementName];\n    if (!templateIsValid(template)) {\n      return true;\n    }\n  }\n  return false;\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {Promise<void>} */\nlet readyPromise = null;\n\n/** @type {?function(?function())} */\nlet whenReady = window['HTMLImports'] && window['HTMLImports']['whenReady'] || null;\n\n/** @type {function()} */\nlet resolveFn;\n\n/**\n * @param {?function()} callback\n */\nexport default function documentWait(callback) {\n  requestAnimationFrame(function() {\n    if (whenReady) {\n      whenReady(callback)\n    } else {\n      if (!readyPromise) {\n        readyPromise = new Promise((resolve) => {resolveFn = resolve});\n        if (document.readyState === 'complete') {\n          resolveFn();\n        } else {\n          document.addEventListener('readystatechange', () => {\n            if (document.readyState === 'complete') {\n              resolveFn();\n            }\n          });\n        }\n      }\n      readyPromise.then(function(){ callback && callback(); });\n    }\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js';\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n  // remove previous properties\n  for (let p in properties) {\n    // NOTE: for bc with shim, don't apply null values.\n    if (p === null) {\n      element.style.removeProperty(p);\n    } else {\n      element.style.setProperty(p, properties[p]);\n    }\n  }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n  /**\n   * @const {string}\n   */\n  const value = window.getComputedStyle(element).getPropertyValue(property);\n  if (!value) {\n    return '';\n  } else {\n    return value.trim();\n  }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n  const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n  // reset state of the regexes\n  MIXIN_MATCH.lastIndex = 0;\n  VAR_ASSIGN.lastIndex = 0;\n  return has;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport documentWait from './document-wait.js';\n\n/**\n * @typedef {HTMLStyleElement | {getStyle: function():HTMLStyleElement}}\n */\nexport let CustomStyleProvider;\n\nconst SEEN_MARKER = '__seenByShadyCSS';\nconst CACHED_STYLE = '__shadyCSSCachedStyle';\n\n/** @type {?function(!HTMLStyleElement)} */\nlet transformFn = null;\n\n/** @type {?function()} */\nlet validateFn = null;\n\n/**\nThis interface is provided to add document-level <style> elements to ShadyCSS for processing.\nThese styles must be processed by ShadyCSS to simulate ShadowRoot upper-bound encapsulation from outside styles\nIn addition, these styles may also need to be processed for @apply rules and CSS Custom Properties\n\nTo add document-level styles to ShadyCSS, one can call `ShadyCSS.addDocumentStyle(styleElement)` or `ShadyCSS.addDocumentStyle({getStyle: () => styleElement})`\n\nIn addition, if the process used to discover document-level styles can be synchronously flushed, one should set `ShadyCSS.documentStyleFlush`.\nThis function will be called when calculating styles.\n\nAn example usage of the document-level styling api can be found in `examples/document-style-lib.js`\n\n@unrestricted\n*/\nexport default class CustomStyleInterface {\n  constructor() {\n    /** @type {!Array<!CustomStyleProvider>} */\n    this['customStyles'] = [];\n    this['enqueued'] = false;\n  }\n  /**\n   * Queue a validation for new custom styles to batch style recalculations\n   */\n  enqueueDocumentValidation() {\n    if (this['enqueued'] || !validateFn) {\n      return;\n    }\n    this['enqueued'] = true;\n    documentWait(validateFn);\n  }\n  /**\n   * @param {!HTMLStyleElement} style\n   */\n  addCustomStyle(style) {\n    if (!style[SEEN_MARKER]) {\n      style[SEEN_MARKER] = true;\n      this['customStyles'].push(style);\n      this.enqueueDocumentValidation();\n    }\n  }\n  /**\n   * @param {!CustomStyleProvider} customStyle\n   * @return {HTMLStyleElement}\n   */\n  getStyleForCustomStyle(customStyle) {\n    if (customStyle[CACHED_STYLE]) {\n      return customStyle[CACHED_STYLE];\n    }\n    let style;\n    if (customStyle['getStyle']) {\n      style = customStyle['getStyle']();\n    } else {\n      style = customStyle;\n    }\n    return style;\n  }\n  /**\n   * @return {!Array<!CustomStyleProvider>}\n   */\n  processStyles() {\n    const cs = this['customStyles'];\n    for (let i = 0; i < cs.length; i++) {\n      const customStyle = cs[i];\n      if (customStyle[CACHED_STYLE]) {\n        continue;\n      }\n      const style = this.getStyleForCustomStyle(customStyle);\n      if (style) {\n        // HTMLImports polyfill may have cloned the style into the main document,\n        // which is referenced with __appliedElement.\n        const styleToTransform = /** @type {!HTMLStyleElement} */(style['__appliedElement'] || style);\n        if (transformFn) {\n          transformFn(styleToTransform);\n        }\n        customStyle[CACHED_STYLE] = styleToTransform;\n      }\n    }\n    return cs;\n  }\n}\n\nCustomStyleInterface.prototype['addCustomStyle'] = CustomStyleInterface.prototype.addCustomStyle;\nCustomStyleInterface.prototype['getStyleForCustomStyle'] = CustomStyleInterface.prototype.getStyleForCustomStyle;\nCustomStyleInterface.prototype['processStyles'] = CustomStyleInterface.prototype.processStyles;\n\nObject.defineProperties(CustomStyleInterface.prototype, {\n  'transformCallback': {\n    /** @return {?function(!HTMLStyleElement)} */\n    get() {\n      return transformFn;\n    },\n    /** @param {?function(!HTMLStyleElement)} fn */\n    set(fn) {\n      transformFn = fn;\n    }\n  },\n  'validateCallback': {\n    /** @return {?function()} */\n    get() {\n      return validateFn;\n    },\n    /**\n     * @param {?function()} fn\n     * @this {CustomStyleInterface}\n     */\n    set(fn) {\n      let needsEnqueue = false;\n      if (!validateFn) {\n        needsEnqueue = true;\n      }\n      validateFn = fn;\n      if (needsEnqueue) {\n        this.enqueueDocumentValidation();\n      }\n    },\n  }\n})\n\n/** @typedef {{\n * customStyles: !Array<!CustomStyleProvider>,\n * addCustomStyle: function(!CustomStyleProvider),\n * getStyleForCustomStyle: function(!CustomStyleProvider): HTMLStyleElement,\n * findStyles: function(),\n * transformCallback: ?function(!HTMLStyleElement),\n * validateCallback: ?function()\n * }}\n */\nexport let CustomStyleInterfaceInterface;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {parse, StyleNode} from './css-parse.js';\nimport {nativeShadow, nativeCssVariables} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport * as StyleUtil from './style-util.js';\nimport StyleProperties from './style-properties.js';\nimport placeholderMap from './style-placeholder.js';\nimport StyleInfo from './style-info.js';\nimport StyleCache from './style-cache.js';\nimport {flush as watcherFlush} from './document-watcher.js';\nimport templateMap from './template-map.js';\nimport * as ApplyShimUtils from './apply-shim-utils.js';\nimport documentWait from './document-wait.js';\nimport {updateNativeProperties, detectMixin} from './common-utils.js';\nimport {CustomStyleInterfaceInterface} from './custom-style-interface.js'; // eslint-disable-line no-unused-vars\n\n/**\n * @const {StyleCache}\n */\nconst styleCache = new StyleCache();\n\nexport default class ScopingShim {\n  constructor() {\n    this._scopeCounter = {};\n    this._documentOwner = document.documentElement;\n    let ast = new StyleNode();\n    ast['rules'] = [];\n    this._documentOwnerStyleInfo = StyleInfo.set(this._documentOwner, new StyleInfo(ast));\n    this._elementsHaveApplied = false;\n    this._applyShim = null;\n    /** @type {?CustomStyleInterfaceInterface} */\n    this._customStyleInterface = null;\n    documentWait(() => {\n      this._ensure();\n    });\n  }\n  flush() {\n    watcherFlush();\n  }\n  _generateScopeSelector(name) {\n    let id = this._scopeCounter[name] = (this._scopeCounter[name] || 0) + 1;\n    return `${name}-${id}`;\n  }\n  getStyleAst(style) {\n    return StyleUtil.rulesForStyle(style);\n  }\n  styleAstToString(ast) {\n    return StyleUtil.toCssText(ast);\n  }\n  _gatherStyles(template) {\n    return StyleUtil.gatherStyleText(template.content);\n  }\n  _getCssBuild(template) {\n    let style = template.content.querySelector('style');\n    if (!style) {\n      return '';\n    }\n    return style.getAttribute('css-build') || '';\n  }\n  /**\n   * Prepare the styling and template for the given element type\n   *\n   * @param {HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} typeExtension\n   */\n  prepareTemplate(template, elementName, typeExtension) {\n    if (template._prepared) {\n      return;\n    }\n    template._prepared = true;\n    template.name = elementName;\n    template.extends = typeExtension;\n    templateMap[elementName] = template;\n    let cssBuild = this._getCssBuild(template);\n    let cssText = this._gatherStyles(template);\n    let info = {\n      is: elementName,\n      extends: typeExtension,\n      __cssBuild: cssBuild,\n    };\n    if (!nativeShadow) {\n      StyleTransformer.dom(template.content, elementName);\n    }\n    // check if the styling has mixin definitions or uses\n    this._ensure();\n    let hasMixins = detectMixin(cssText)\n    let ast = parse(cssText);\n    // only run the applyshim transforms if there is a mixin involved\n    if (hasMixins && nativeCssVariables && this._applyShim) {\n      this._applyShim['transformRules'](ast, elementName);\n    }\n    template['_styleAst'] = ast;\n    template._cssBuild = cssBuild;\n\n    let ownPropertyNames = [];\n    if (!nativeCssVariables) {\n      ownPropertyNames = StyleProperties.decorateStyles(template['_styleAst'], info);\n    }\n    if (!ownPropertyNames.length || nativeCssVariables) {\n      let root = nativeShadow ? template.content : null;\n      let placeholder = placeholderMap[elementName];\n      let style = this._generateStaticStyle(info, template['_styleAst'], root, placeholder);\n      template._style = style;\n    }\n    template._ownPropertyNames = ownPropertyNames;\n  }\n  _generateStaticStyle(info, rules, shadowroot, placeholder) {\n    let cssText = StyleTransformer.elementStyles(info, rules);\n    if (cssText.length) {\n      return StyleUtil.applyCss(cssText, info.is, shadowroot, placeholder);\n    }\n  }\n  _prepareHost(host) {\n    let {is, typeExtension} = StyleUtil.getIsExtends(host);\n    let placeholder = placeholderMap[is];\n    let template = templateMap[is];\n    let ast;\n    let ownStylePropertyNames;\n    let cssBuild;\n    if (template) {\n      ast = template['_styleAst'];\n      ownStylePropertyNames = template._ownPropertyNames;\n      cssBuild = template._cssBuild;\n    }\n    return StyleInfo.set(host,\n      new StyleInfo(\n        ast,\n        placeholder,\n        ownStylePropertyNames,\n        is,\n        typeExtension,\n        cssBuild\n      )\n    );\n  }\n  _ensureApplyShim() {\n    if (this._applyShim) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.ApplyShim) {\n      this._applyShim = window.ShadyCSS.ApplyShim;\n      this._applyShim['invalidCallback'] = ApplyShimUtils.invalidate;\n    }\n  }\n  _ensureCustomStyleInterface() {\n    if (this._customStyleInterface) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.CustomStyleInterface) {\n      this._customStyleInterface = /** @type {!CustomStyleInterfaceInterface} */(window.ShadyCSS.CustomStyleInterface);\n      /** @type {function(!HTMLStyleElement)} */\n      this._customStyleInterface['transformCallback'] = (style) => {this.transformCustomStyleForDocument(style)};\n      this._customStyleInterface['validateCallback'] = () => {\n        requestAnimationFrame(() => {\n          if (this._customStyleInterface['enqueued'] || this._elementsHaveApplied) {\n            this.flushCustomStyles();\n          }\n        })\n      };\n    }\n  }\n  _ensure() {\n    this._ensureApplyShim();\n    this._ensureCustomStyleInterface();\n  }\n  /**\n   * Flush and apply custom styles to document\n   */\n  flushCustomStyles() {\n    this._ensure();\n    if (!this._customStyleInterface) {\n      return;\n    }\n    let customStyles = this._customStyleInterface['processStyles']();\n    // early return if custom-styles don't need validation\n    if (!this._customStyleInterface['enqueued']) {\n      return;\n    }\n    if (!nativeCssVariables) {\n      this._updateProperties(this._documentOwner, this._documentOwnerStyleInfo);\n      this._applyCustomStyles(customStyles);\n    } else {\n      this._revalidateCustomStyleApplyShim(customStyles);\n    }\n    this._customStyleInterface['enqueued'] = false;\n    // if custom elements have upgraded and there are no native css variables, we must recalculate the whole tree\n    if (this._elementsHaveApplied && !nativeCssVariables) {\n      this.styleDocument();\n    }\n  }\n  /**\n   * Apply styles for the given element\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} overrideProps\n   */\n  styleElement(host, overrideProps) {\n    let {is} = StyleUtil.getIsExtends(host);\n    let styleInfo = StyleInfo.get(host);\n    if (!styleInfo) {\n      styleInfo = this._prepareHost(host);\n    }\n    // Only trip the `elementsHaveApplied` flag if a node other that the root document has `applyStyle` called\n    if (!this._isRootOwner(host)) {\n      this._elementsHaveApplied = true;\n    }\n    if (overrideProps) {\n      styleInfo.overrideStyleProperties =\n        styleInfo.overrideStyleProperties || {};\n      Object.assign(styleInfo.overrideStyleProperties, overrideProps);\n    }\n    if (!nativeCssVariables) {\n     this._updateProperties(host, styleInfo);\n      if (styleInfo.ownStylePropertyNames && styleInfo.ownStylePropertyNames.length) {\n        this._applyStyleProperties(host, styleInfo);\n      }\n    } else {\n      if (styleInfo.overrideStyleProperties) {\n        updateNativeProperties(host, styleInfo.overrideStyleProperties);\n      }\n      let template = templateMap[is];\n      // bail early if there is no shadowroot for this element\n      if (!template && !this._isRootOwner(host)) {\n        return;\n      }\n      if (template && template._style && !ApplyShimUtils.templateIsValid(template)) {\n        // update template\n        if (!ApplyShimUtils.templateIsValidating(template)) {\n          this._ensure();\n          this._applyShim && this._applyShim['transformRules'](template['_styleAst'], is);\n          template._style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          ApplyShimUtils.startValidatingTemplate(template);\n        }\n        // update instance if native shadowdom\n        if (nativeShadow) {\n          let root = host.shadowRoot;\n          if (root) {\n            let style = root.querySelector('style');\n            style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          }\n        }\n        styleInfo.styleRules = template['_styleAst'];\n      }\n    }\n  }\n  _styleOwnerForNode(node) {\n    let root = node.getRootNode();\n    let host = root.host;\n    if (host) {\n      if (StyleInfo.get(host)) {\n        return host;\n      } else {\n        return this._styleOwnerForNode(host);\n      }\n    }\n    return this._documentOwner;\n  }\n  _isRootOwner(node) {\n    return (node === this._documentOwner);\n  }\n  _applyStyleProperties(host, styleInfo) {\n    let is = StyleUtil.getIsExtends(host).is;\n    let cacheEntry = styleCache.fetch(is, styleInfo.styleProperties, styleInfo.ownStylePropertyNames);\n    let cachedScopeSelector = cacheEntry && cacheEntry.scopeSelector;\n    let cachedStyle = cacheEntry ? cacheEntry.styleElement : null;\n    let oldScopeSelector = styleInfo.scopeSelector;\n    // only generate new scope if cached style is not found\n    styleInfo.scopeSelector = cachedScopeSelector || this._generateScopeSelector(is);\n    let style = StyleProperties.applyElementStyle(host, styleInfo.styleProperties, styleInfo.scopeSelector, cachedStyle);\n    if (!nativeShadow) {\n      StyleProperties.applyElementScopeSelector(host, styleInfo.scopeSelector, oldScopeSelector);\n    }\n    if (!cacheEntry) {\n      styleCache.store(is, styleInfo.styleProperties, style, styleInfo.scopeSelector);\n    }\n    return style;\n  }\n  _updateProperties(host, styleInfo) {\n    let owner = this._styleOwnerForNode(host);\n    let ownerStyleInfo = StyleInfo.get(owner);\n    let ownerProperties = ownerStyleInfo.styleProperties;\n    let props = Object.create(ownerProperties || null);\n    let hostAndRootProps = StyleProperties.hostAndRootPropertiesForScope(host, styleInfo.styleRules);\n    let propertyData = StyleProperties.propertyDataFromStyles(ownerStyleInfo.styleRules, host);\n    let propertiesMatchingHost = propertyData.properties\n    Object.assign(\n      props,\n      hostAndRootProps.hostProps,\n      propertiesMatchingHost,\n      hostAndRootProps.rootProps\n    );\n    this._mixinOverrideStyles(props, styleInfo.overrideStyleProperties);\n    StyleProperties.reify(props);\n    styleInfo.styleProperties = props;\n  }\n  _mixinOverrideStyles(props, overrides) {\n    for (let p in overrides) {\n      let v = overrides[p];\n      // skip override props if they are not truthy or 0\n      // in order to fall back to inherited values\n      if (v || v === 0) {\n        props[p] = v;\n      }\n    }\n  }\n  /**\n   * Update styles of the whole document\n   *\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    this.styleSubtree(this._documentOwner, properties);\n  }\n  /**\n   * Update styles of a subtree\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} properties\n   */\n  styleSubtree(host, properties) {\n    let root = host.shadowRoot;\n    if (root || this._isRootOwner(host)) {\n      this.styleElement(host, properties);\n    }\n    // process the shadowdom children of `host`\n    let shadowChildren = root && (root.children || root.childNodes);\n    if (shadowChildren) {\n      for (let i = 0; i < shadowChildren.length; i++) {\n        let c = /** @type {!HTMLElement} */(shadowChildren[i]);\n        this.styleSubtree(c);\n      }\n    } else {\n      // process the lightdom children of `host`\n      let children = host.children || host.childNodes;\n      if (children) {\n        for (let i = 0; i < children.length; i++) {\n          let c = /** @type {!HTMLElement} */(children[i]);\n          this.styleSubtree(c);\n        }\n      }\n    }\n  }\n  /* Custom Style operations */\n  _revalidateCustomStyleApplyShim(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        this._revalidateApplyShim(s);\n      }\n    }\n  }\n  _applyCustomStyles(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        StyleProperties.applyCustomStyle(s, this._documentOwnerStyleInfo.styleProperties);\n      }\n    }\n  }\n  transformCustomStyleForDocument(style) {\n    let ast = StyleUtil.rulesForStyle(style);\n    StyleUtil.forEachRule(ast, (rule) => {\n      if (nativeShadow) {\n        StyleTransformer.normalizeRootSelector(rule);\n      } else {\n        StyleTransformer.documentRule(rule);\n      }\n      if (nativeCssVariables) {\n        this._ensure();\n        this._applyShim && this._applyShim['transformRule'](rule);\n      }\n    });\n    if (nativeCssVariables) {\n      style.textContent = StyleUtil.toCssText(ast);\n    } else {\n      this._documentOwnerStyleInfo.styleRules.rules.push(ast);\n    }\n  }\n  _revalidateApplyShim(style) {\n    if (nativeCssVariables && this._applyShim) {\n      let ast = StyleUtil.rulesForStyle(style);\n      this._ensure();\n      this._applyShim['transformRules'](ast);\n      style.textContent = StyleUtil.toCssText(ast);\n    }\n  }\n  getComputedStyleValue(element, property) {\n    let value;\n    if (!nativeCssVariables) {\n      // element is either a style host, or an ancestor of a style host\n      let styleInfo = StyleInfo.get(element) || StyleInfo.get(this._styleOwnerForNode(element));\n      value = styleInfo.styleProperties[property];\n    }\n    // fall back to the property value from the computed styling\n    value = value || window.getComputedStyle(element).getPropertyValue(property);\n    // trim whitespace that can come after the `:` in css\n    // example: padding: 2px -> \" 2px\"\n    return value ? value.trim() : '';\n  }\n  // given an element and a classString, replaces\n  // the element's class with the provided classString and adds\n  // any necessary ShadyCSS static and property based scoping selectors\n  setElementClass(element, classString) {\n    let root = element.getRootNode();\n    let classes = classString ? classString.split(/\\s/) : [];\n    let scopeName = root.host && root.host.localName;\n    // If no scope, try to discover scope name from existing class.\n    // This can occur if, for example, a template stamped element that\n    // has been scoped is manipulated when not in a root.\n    if (!scopeName) {\n      var classAttr = element.getAttribute('class');\n      if (classAttr) {\n        let k$ = classAttr.split(/\\s/);\n        for (let i=0; i < k$.length; i++) {\n          if (k$[i] === StyleTransformer.SCOPE_NAME) {\n            scopeName = k$[i+1];\n            break;\n          }\n        }\n      }\n    }\n    if (scopeName) {\n      classes.push(StyleTransformer.SCOPE_NAME, scopeName);\n    }\n    if (!nativeCssVariables) {\n      let styleInfo = StyleInfo.get(element);\n      if (styleInfo && styleInfo.scopeSelector) {\n        classes.push(StyleProperties.XSCOPE_NAME, styleInfo.scopeSelector);\n      }\n    }\n    StyleUtil.setElementClassRaw(element, classes.join(' '));\n  }\n  _styleInfoForNode(node) {\n    return StyleInfo.get(node);\n  }\n}\n\n/* exports */\nScopingShim.prototype['flush'] = ScopingShim.prototype.flush;\nScopingShim.prototype['prepareTemplate'] = ScopingShim.prototype.prepareTemplate;\nScopingShim.prototype['styleElement'] = ScopingShim.prototype.styleElement;\nScopingShim.prototype['styleDocument'] = ScopingShim.prototype.styleDocument;\nScopingShim.prototype['styleSubtree'] = ScopingShim.prototype.styleSubtree;\nScopingShim.prototype['getComputedStyleValue'] = ScopingShim.prototype.getComputedStyleValue;\nScopingShim.prototype['setElementClass'] = ScopingShim.prototype.setElementClass;\nScopingShim.prototype['_styleInfoForNode'] = ScopingShim.prototype._styleInfoForNode;\nScopingShim.prototype['transformCustomStyleForDocument'] = ScopingShim.prototype.transformCustomStyleForDocument;\nScopingShim.prototype['getStyleAst'] = ScopingShim.prototype.getStyleAst;\nScopingShim.prototype['styleAstToString'] = ScopingShim.prototype.styleAstToString;\nScopingShim.prototype['flushCustomStyles'] = ScopingShim.prototype.flushCustomStyles;\nObject.defineProperties(ScopingShim.prototype, {\n  'nativeShadow': {\n    get() {\n      return nativeShadow;\n    }\n  },\n  'nativeCss': {\n    get() {\n      return nativeCssVariables;\n    }\n  }\n});","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport ScopingShim from '../src/scoping-shim.js';\nimport {nativeCssVariables, nativeShadow} from '../src/style-settings.js';\n\n/** @const {ScopingShim} */\nconst scopingShim = new ScopingShim();\n\nlet ApplyShim, CustomStyleInterface;\n\nif (window['ShadyCSS']) {\n  ApplyShim = window['ShadyCSS']['ApplyShim'];\n  CustomStyleInterface = window['ShadyCSS']['CustomStyleInterface'];\n}\n\nwindow.ShadyCSS = {\n  ScopingShim: scopingShim,\n  /**\n   * @param {!HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} elementExtends\n   */\n  prepareTemplate(template, elementName, elementExtends) {\n    scopingShim.flushCustomStyles();\n    scopingShim.prepareTemplate(template, elementName, elementExtends)\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   * @param {Object=} properties\n   */\n  styleSubtree(element, properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleSubtree(element, properties);\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   */\n  styleElement(element) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleElement(element);\n  },\n\n  /**\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleDocument(properties);\n  },\n\n  /**\n   * @param {Element} element\n   * @param {string} property\n   * @return {string}\n   */\n  getComputedStyleValue(element, property) {\n    return scopingShim.getComputedStyleValue(element, property);\n  },\n\n  nativeCss: nativeCssVariables,\n\n  nativeShadow: nativeShadow\n};\n\nif (ApplyShim) {\n  window.ShadyCSS.ApplyShim = ApplyShim;\n}\n\nif (CustomStyleInterface) {\n  window.ShadyCSS.CustomStyleInterface = CustomStyleInterface;\n}","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n'use strict';\n// It's desireable to provide a default stylesheet\n// that's convenient for styling unresolved elements, but\n// it's cumbersome to have to include this manually in every page.\n// It would make sense to put inside some HTMLImport but\n// the HTMLImports polyfill does not allow loading of stylesheets\n// that block rendering. Therefore this injection is tolerated here.\n//\n// NOTE: position: relative fixes IE's failure to inherit opacity\n// when a child is not statically positioned.\nlet style = document.createElement('style');\nstyle.textContent = ''\n    + 'body {'\n    + 'transition: opacity ease-in 0.2s;'\n    + ' } \\n'\n    + 'body[unresolved] {'\n    + 'opacity: 0; display: block; overflow: hidden; position: relative;'\n    + ' } \\n'\n    ;\nlet head = document.querySelector('head');\nhead.insertBefore(style, head.firstChild);","/*\n *  @license\n *    Copyright 2017 Brigham Young University\n *\n *    Licensed under the Apache License, Version 2.0 (the \"License\");\n *    you may not use this file except in compliance with the License.\n *    You may obtain a copy of the License at\n *\n *        http://www.apache.org/licenses/LICENSE-2.0\n *\n *    Unless required by applicable law or agreed to in writing, software\n *    distributed under the License is distributed on an \"AS IS\" BASIS,\n *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n *    See the License for the specific language governing permissions and\n *    limitations under the License.\n */\n\"use strict\";\n\n//------ webcomponents-platform ------\nimport '../node_modules/webcomponents-platform/webcomponents-platform.js'\n//------ template ------\nimport '../node_modules/@webcomponents/template/template.js'\n//------ es6-promise ------\nimport '../node_modules/es6-promise/lib/es6-promise.auto.js'\n//------ pre-polyfill ------\nimport '../node_modules/webcomponents.js/src/pre-polyfill.js'\n//------ shadydom ------\nimport '../node_modules/@webcomponents/shadydom/src/shadydom.js'\n//------ custom-elements ------\nimport '../node_modules/@webcomponents/custom-elements/src/custom-elements.js'\n//------ shadycss ------\nimport '../node_modules/@webcomponents/shadycss/entrypoints/scoping-shim.js'\n//------ unresolved styles ------\nimport 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diff --git a/dist/web-component-polyfills.min.js b/dist/web-component-polyfills.min.js
index 31a8e75..c8e99d4 100644
--- a/dist/web-component-polyfills.min.js
+++ b/dist/web-component-polyfills.min.js
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t=e.__shady.flattenedNodes;if(t)for(var n=0;n<t.length;n++){var o=t[n],r=te(o);r&&Jn.call(r,o)}},Uo.prototype._hasInsertionPoint=function(){return this._validateSlots(),Boolean(this._slotList.length)},Uo.prototype.addEventListener=function(e,t,n){"object"!==(void 0===n?"undefined":nn(n))&&(n={capture:Boolean(n)}),n.__shadyTarget=this,this.host.addEventListener(e,t,n)},Uo.prototype.removeEventListener=function(e,t,n){"object"!==(void 0===n?"undefined":nn(n))&&(n={capture:Boolean(n)}),n.__shadyTarget=this,this.host.removeEventListener(e,t,n)},Uo.prototype.getElementById=function(e){return Pe(this,function(t){return t.id==e},function(e){return Boolean(e)})[0]||null},function(e){ve(e,bo,!0),ve(e,Co,!0)}(Uo.prototype);var Wo={addEventListener:$e.bind(window),removeEventListener:Je.bind(window)},Ko={addEventListener:$e,removeEventListener:Je,appendChild:function(e){return be(this,e)},insertBefore:function(e,t){return be(this,e,t)},removeChild:function(e){return Ce(this,e)},replaceChild:function(e,t){return be(this,e,t),Ce(this,t),e},cloneNode:function(e){return He(this,e)},getRootNode:function(e){return Me(this,e)},contains:function(e){return V(this,e)},get isConnected(){var e=this.ownerDocument;if(Wn&&co.call(e,this))return!0;if(e.documentElement&&co.call(e.documentElement,this))return!0;for(var t=this;t&&!(t instanceof Document);)t=t.parentNode||(t instanceof Uo?t.host:void 0);return!!(t&&t instanceof Document)},dispatchEvent:function(e){return Y(),so.call(this,e)}},Vo={get assignedSlot(){return ut(this)}},Go={querySelector:function(e){return Pe(this,function(t){return I(t,e)},function(e){return Boolean(e)})[0]||null},querySelectorAll:function(e){return Pe(this,function(t){return I(t,e)})}},Yo={assignedNodes:function(e){if("slot"===this.localName)return Fe(this),this.__shady?(e&&e.flatten?this.__shady.flattenedNodes:this.__shady.assignedNodes)||[]:[]}},zo=q({setAttribute:function(e,t){je(this,e,t)},removeAttribute:function(e){Ie(this,e)},attachShadow:function(e){return ct(this,e)},get slot(){return this.getAttribute("slot")},set slot(e){je(this,"slot",e)},get assignedSlot(){return ut(this)}},Go,Yo);Object.defineProperties(zo,No);var Xo=q({importNode:function(e,t){return Be(e,t)},getElementById:function(e){return Pe(this,function(t){return t.id==e},function(e){return Boolean(e)})[0]||null}},Go);Object.defineProperties(Xo,{_activeElement:Co.activeElement});var $o=HTMLElement.prototype.blur,Jo=q({blur:function(){var e=this.__shady&&this.__shady.root,t=e&&e.activeElement;t?t.blur():$o.call(this)}});/**
 @license
 Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -115,16 +115,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
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e},Nn.prototype._render=function(){this._renderPending&&this._getRenderRoot()._renderRoot()},Nn.prototype._renderRoot=function(){this._renderPending=!1,this._distribute(),this._compose(),this._hasRendered=!0},Nn.prototype._distribute=function(){for(var e,t=0;t<this._slotList.length;t++)e=this._slotList[t],this._clearSlotAssignedNodes(e);for(var n=this.host.firstChild;n;n=n.nextSibling)this._distributeNodeToSlot(n);for(var o,r=0;r<this._slotList.length;r++){if(o=this._slotList[r],!o.__shady.assignedNodes.length)for(var i=o.firstChild;i;i=i.nextSibling)this._distributeNodeToSlot(i,o);var s=o.parentNode,a=s.__shady&&s.__shady.root;a&&a._hasInsertionPoint()&&a._renderRoot(),this._addAssignedToFlattenedNodes(o.__shady.flattenedNodes,o.__shady.assignedNodes);var l=o.__shady._previouslyAssignedNodes;if(l){for(var c=0;c<l.length;c++)l[c].__shady._prevAssignedSlot=null;o.__shady._previouslyAssignedNodes=null,l.length>o.__shady.assignedNodes.length&&(o.__shady.dirty=!0)}o.__shady.dirty&&(o.__shady.dirty=!1,this._fireSlotChange(o))}},Nn.prototype._distributeNodeToSlot=function(e,t){e.__shady=e.__shady||{};var n=e.__shady._prevAssignedSlot;e.__shady._prevAssignedSlot=null;var o=t;if(!o){var r=e.slot||"__catchall",i=this._slotMap[r];o=i&&i[0]}o?(o.__shady.assignedNodes.push(e),e.__shady.assignedSlot=o):e.__shady.assignedSlot=void 0,n!==e.__shady.assignedSlot&&e.__shady.assignedSlot&&(e.__shady.assignedSlot.__shady.dirty=!0)},Nn.prototype._clearSlotAssignedNodes=function(e){var t=e.__shady.assignedNodes;if(e.__shady.assignedNodes=[],e.__shady.flattenedNodes=[],e.__shady._previouslyAssignedNodes=t,t)for(var n=0;n<t.length;n++){var o=t[n];o.__shady._prevAssignedSlot=o.__shady.assignedSlot,o.__shady.assignedSlot===e&&(o.__shady.assignedSlot=null)}},Nn.prototype._addAssignedToFlattenedNodes=function(e,t){for(var n,o=0;o<t.length&&(n=t[o]);o++)"slot"==n.localName?this._addAssignedToFlattenedNodes(e,n.__shady.assignedNodes):e.push(t[o])},Nn.prototype._fireSlotChange=function(e){qt.call(e,new Event("slotchange")),e.__shady.assignedSlot&&this._fireSlotChange(e.__shady.assignedSlot)},Nn.prototype._compose=function(){for(var e=this._slotList,t=[],n=0;n<e.length;n++){var o=e[n].parentNode;o.__shady&&o.__shady.root||!(t.indexOf(o)<0)||t.push(o)}for(var r=0;r<t.length;r++){var i=t[r],s=i===this?this.host:i;this._updateChildNodes(s,this._composeNode(i))}},Nn.prototype._composeNode=function(e){for(var t=[],n=e.childNodes,o=0;o<n.length;o++){var r=n[o];if(this._isInsertionPoint(r))for(var i=r.__shady.flattenedNodes,s=0;s<i.length;s++){var a=i[s];t.push(a)}else t.push(r)}return t},Nn.prototype._isInsertionPoint=function(e){return"slot"==e.localName},Nn.prototype._updateChildNodes=function(e,t){for(var n,o=N(e),r=Ne(t,o),i=0,s=0;i<r.length&&(n=r[i]);i++){for(var a,l=0;l<n.removed.length&&(a=n.removed[l]);l++)g(a)===e&&Rt.call(e,a),o.splice(n.index+s,1);s-=n.addedCount}for(var c,u,d=0;d<r.length&&(c=r[d]);d++){u=o[c.index];for(var h,f=c.index;f<c.index+c.addedCount;f++)h=t[f],Pt.call(e,h,u),o.splice(f,0,h)}},Nn.prototype._addSlots=function(e){var t=void 0;this._slotMap=this._slotMap||{},this._slotList=this._slotList||[];for(var n=0;n<e.length;n++){var o=e[n];o.__shady=o.__shady||{},dn(o),dn(o.parentNode);var r=this._nameForSlot(o);this._slotMap[r]?(t=t||{},t[r]=!0,this._slotMap[r].push(o)):this._slotMap[r]=[o],this._slotList.push(o)}if(t)for(var i in t)this._slotMap[i]=this._sortSlots(this._slotMap[i])},Nn.prototype._nameForSlot=function(e){var t=e.name||e.getAttribute("name")||"__catchall";return e.__slotName=t,t},Nn.prototype._sortSlots=function(e){return e.sort(function(e,t){for(var n=Ce(e),o=Ce(t),r=0;r<n.length;r++){var i=n[r],s=o[r];if(i!==s){var a=Array.from(i.parentNode.childNodes);return a.indexOf(i)-a.indexOf(s)}}})},Nn.prototype._removeContainedSlots=function(e){var t=void 0;this._slotMap=this._slotMap||{},this._slotList=this._slotList||[];var n=this._slotMap;for(var o in n)for(var r=n[o],i=0;i<r.length;i++){var s=r[i];if(Te(e,s)){r.splice(i,1);var a=this._slotList.indexOf(s);a>=0&&this._slotList.splice(a,1),i--,this._removeFlattenedNodes(s),t=!0}}return t},Nn.prototype._updateSlotName=function(e){var t=e.__slotName,n=this._nameForSlot(e);if(n!==t){var o=this._slotMap[t],r=o.indexOf(e);r>=0&&o.splice(r,1);var i=this._slotMap[n]||(this._slotMap[n]=[]);i.push(e),i.length>1&&(this._slotMap[n]=this._sortSlots(i))}},Nn.prototype._removeFlattenedNodes=function(e){var t=e.__shady.flattenedNodes;if(t)for(var n=0;n<t.length;n++){var o=t[n],r=g(o);r&&Rt.call(r,o)}},Nn.prototype._hasInsertionPoint=function(){return Boolean(this._slotList.length)},Nn.prototype.addEventListener=function(e,t,n){"object"!==(void 0===n?"undefined":mt(n))&&(n={capture:Boolean(n)}),n.__shadyTarget=this,this.host.addEventListener(e,t,n)},Nn.prototype.removeEventListener=function(e,t,n){"object"!==(void 0===n?"undefined":mt(n))&&(n={capture:Boolean(n)}),n.__shadyTarget=this,this.host.removeEventListener(e,t,n)},Nn.prototype.getElementById=function(e){return J(this,function(t){return t.id==e},function(e){return Boolean(e)})[0]||null},function(e){j(e,sn,!0),j(e,ln,!0)}(Nn.prototype);var Cn={addEventListener:fe.bind(window),removeEventListener:pe.bind(window)},Tn={addEventListener:fe,removeEventListener:pe,appendChild:function(e){return U(this,e)},insertBefore:function(e,t){return U(this,e,t)},removeChild:function(e){return q(this,e)},replaceChild:function(e,t){return U(this,e,t),q(this,t),e},cloneNode:function(e){return oe(this,e)},getRootNode:function(e){return $(this,e)},get isConnected(){var e=this.ownerDocument;if(e&&e.contains&&e.contains(this))return!0;var t=e.documentElement;if(t&&t.contains&&t.contains(this))return!0;for(var n=this;n&&!(n instanceof Document);)n=n.parentNode||(n instanceof Nn?n.host:void 0);return!!(n&&n instanceof Document)},dispatchEvent:function(e){return d(),qt.call(this,e)}},An={get assignedSlot(){return ke(this)}},kn={querySelector:function(e){return J(this,function(t){return o(t,e)},function(e){return Boolean(e)})[0]||null},querySelectorAll:function(e){return J(this,function(t){return o(t,e)})}},On={assignedNodes:function(e){if("slot"===this.localName)return ee(this),this.__shady?(e&&e.flatten?this.__shady.flattenedNodes:this.__shady.assignedNodes)||[]:[]}},Dn=s({setAttribute:function(e,t){te(this,e,t)},removeAttribute:function(e){ne(this,e)},attachShadow:function(e){return Ae(this,e)},get slot(){return this.getAttribute("slot")},set slot(e){te(this,"slot",e)},get assignedSlot(){return ke(this)}},kn,On);Object.defineProperties(Dn,an);var xn=s({importNode:function(e,t){return re(e,t)},getElementById:function(e){return J(this,function(t){return t.id==e},function(e){return Boolean(e)})[0]||null}},kn);Object.defineProperties(xn,{_activeElement:ln.activeElement});var Mn=HTMLElement.prototype.blur,Pn=s({blur:function(){var e=this.__shady&&this.__shady.root,t=e&&e.activeElement;t?t.blur():Mn.call(this)}});/**
-@license
-Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-*/
-if(St.inUse){var Rn={inUse:St.inUse,patch:function(e){return e},isShadyRoot:t,enqueue:u,flush:d,settings:St,filterMutations:h,observeChildren:Dt,unobserveChildren:xt,nativeMethods:Yt,nativeTree:Zt};window.ShadyDOM=Rn,function(){window.Event=yn,window.CustomEvent=mn,window.MouseEvent=vn,_e()}(),function(){var e=window.customElements&&window.customElements.nativeHTMLElement||HTMLElement;Oe(window.Node.prototype,Tn),Oe(window.Window.prototype,Cn),Oe(window.Text.prototype,An),Oe(window.DocumentFragment.prototype,kn),Oe(window.Element.prototype,Dn),Oe(window.Document.prototype,xn),window.HTMLSlotElement&&Oe(window.HTMLSlotElement.prototype,On),Oe(e.prototype,Pn),St.hasDescriptors&&(I(window.Node.prototype),I(window.Text.prototype),I(window.DocumentFragment.prototype),I(window.Element.prototype),I(e.prototype),I(window.Document.prototype),window.HTMLSlotElement&&I(window.HTMLSlotElement.prototype))}(),window.ShadowRoot=Nn}var Ln=new Set(["annotation-xml","color-profile","font-face","font-face-src","font-face-uri","font-face-format","font-face-name","missing-glyph"]),jn={custom:1,failed:2},In=function(){function e(){vt(this,e),this._localNameToDefinition=new Map,this._constructorToDefinition=new Map,this._patches=[],this._hasPatches=!1}return gt(e,[{key:"setDefinition",value:function(e,t){this._localNameToDefinition.set(e,t),this._constructorToDefinition.set(t.constructor,t)}},{key:"localNameToDefinition",value:function(e){return this._localNameToDefinition.get(e)}},{key:"constructorToDefinition",value:function(e){return this._constructorToDefinition.get(e)}},{key:"addPatch",value:function(e){this._hasPatches=!0,this._patches.push(e)}},{key:"patchTree",value:function(e){var t=this;this._hasPatches&&Re(e,function(e){return t.patch(e)})}},{key:"patch",value:function(e){if(this._hasPatches&&!e.__CE_patched){e.__CE_patched=!0;for(var t=0;t<this._patches.length;t++)this._patches[t](e)}}},{key:"connectTree",value:function(e){var t=[];Re(e,function(e){return t.push(e)});for(var n=0;n<t.length;n++){var o=t[n];o.__CE_state===jn.custom?this.connectedCallback(o):this.upgradeElement(o)}}},{key:"disconnectTree",value:function(e){var t=[];Re(e,function(e){return t.push(e)});for(var n=0;n<t.length;n++){var o=t[n];o.__CE_state===jn.custom&&this.disconnectedCallback(o)}}},{key:"patchAndUpgradeTree",value:function(e){var t=this,n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},o=n.visitedImports||new Set,r=n.upgrade||function(e){return t.upgradeElement(e)},i=[];if(Re(e,function(e){if("link"===e.localName&&"import"===e.getAttribute("rel")){var n=e.import;n instanceof Node&&"complete"===n.readyState?(n.__CE_isImportDocument=!0,n.__CE_hasRegistry=!0):e.addEventListener("load",function(){var n=e.import;if(!n.__CE_documentLoadHandled){n.__CE_documentLoadHandled=!0,n.__CE_isImportDocument=!0,n.__CE_hasRegistry=!0;new Set(o);o.delete(n),t.patchAndUpgradeTree(n,{visitedImports:o,upgrade:r})}})}else i.push(e)},o),this._hasPatches)for(var s=0;s<i.length;s++)this.patch(i[s]);for(var a=0;a<i.length;a++)r(i[a])}},{key:"upgradeElement",value:function(e){if(void 0===e.__CE_state){var t=this.localNameToDefinition(e.localName);if(t){t.constructionStack.push(e);var n=t.constructor;try{try{if(new n!==e)throw new Error("The custom element constructor did not produce the element being upgraded.")}finally{t.constructionStack.pop()}}catch(t){throw e.__CE_state=jn.failed,t}if(e.__CE_state=jn.custom,e.__CE_definition=t,t.attributeChangedCallback)for(var o=t.observedAttributes,r=0;r<o.length;r++){var i=o[r],s=e.getAttribute(i);null!==s&&this.attributeChangedCallback(e,i,null,s,null)}xe(e)&&this.connectedCallback(e)}}}},{key:"connectedCallback",value:function(e){var t=e.__CE_definition;t.connectedCallback&&t.connectedCallback.call(e)}},{key:"disconnectedCallback",value:function(e){var t=e.__CE_definition;t.disconnectedCallback&&t.disconnectedCallback.call(e)}},{key:"attributeChangedCallback",value:function(e,t,n,o,r){var i=e.__CE_definition;i.attributeChangedCallback&&i.observedAttributes.indexOf(t)>-1&&i.attributeChangedCallback.call(e,t,n,o,r)}}]),e}(),Fn=function(){function e(t,n){vt(this,e),this._internals=t,this._document=n,this._observer=void 0,this._internals.patchAndUpgradeTree(this._document),"loading"===this._document.readyState&&(this._observer=new MutationObserver(this._handleMutations.bind(this)),this._observer.observe(this._document,{childList:!0,subtree:!0}))}return gt(e,[{key:"disconnect",value:function(){this._observer&&this._observer.disconnect()}},{key:"_handleMutations",value:function(e){var t=this._document.readyState;"interactive"!==t&&"complete"!==t||this.disconnect();for(var n=0;n<e.length;n++)for(var o=e[n].addedNodes,r=0;r<o.length;r++){var i=o[r];this._internals.patchAndUpgradeTree(i)}}}]),e}(),Hn=function(){function e(){var t=this;vt(this,e),this._value=void 0,this._resolve=void 0,this._promise=new Promise(function(e){t._resolve=e,t._value&&e(t._value)})}return gt(e,[{key:"resolve",value:function(e){if(this._value)throw new Error("Already resolved.");this._value=e,this._resolve&&this._resolve(e)}},{key:"toPromise",value:function(){return this._promise}}]),e}(),Bn=function(){function e(t){vt(this,e),this._elementDefinitionIsRunning=!1,this._internals=t,this._whenDefinedDeferred=new Map,this._flushCallback=function(e){return e()},this._flushPending=!1,this._pendingDefinitions=[],this._documentConstructionObserver=new Fn(t,document)}return gt(e,[{key:"define",value:function(e,t){var n=this;if(!(t instanceof Function))throw new TypeError("Custom element constructors must be functions.");if(!De(e))throw new SyntaxError("The element name '"+e+"' is not valid.");if(this._internals.localNameToDefinition(e))throw new Error("A custom element with name '"+e+"' has already been 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e=this;if(!1!==this._flushPending){this._flushPending=!1;for(var t=this._pendingDefinitions,n=new Map,o=0;o<t.length;o++)n.set(t[o].localName,[]);for(this._internals.patchAndUpgradeTree(document,{upgrade:function(t){if(e._internals.upgradeElement(t),void 0===t.__CE_state){var o=n.get(t.localName);o&&o.push(t)}}});t.length>0;){var r=t.shift(),i=r.localName;this._internals.setDefinition(i,r);for(var s=n.get(r.localName),a=0;a<s.length;a++)this._internals.upgradeElement(s[a]);var l=this._whenDefinedDeferred.get(i);l&&l.resolve(void 0)}}}},{key:"get",value:function(e){var t=this._internals.localNameToDefinition(e);if(t)return t.constructor}},{key:"whenDefined",value:function(e){if(!De(e))return Promise.reject(new SyntaxError("'"+e+"' is not a valid custom element name."));var t=this._whenDefinedDeferred.get(e);if(t)return t.toPromise();var n=new Hn;return this._whenDefinedDeferred.set(e,n),this._internals.localNameToDefinition(e)&&!this._pendingDefinitions.some(function(t){return 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 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -133,7 +124,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
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 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -142,7 +133,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var io=/(?:^|[;\s{]\s*)(--[\w-]*?)\s*:\s*(?:((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^)]*?\)|[^};{])+)|\{([^}]*)\}(?:(?=[;\s}])|$))/gi,so=/(?:^|\W+)@apply\s*\(?([^);\n]*)\)?/gi,ao=/(--[\w-]+)\s*([:,;)]|$)/gi,lo=/(animation\s*:)|(animation-name\s*:)/,co=/@media\s(.*)/,uo=/\{[^}]*\}/g,ho=null,fo=function(){function e(){vt(this,e)}return gt(e,[{key:"dom",value:function(e,t,n){e.__styleScoped?e.__styleScoped=null:this._transformDom(e,t||"",n)}},{key:"_transformDom",value:function(e,t,n){e.nodeType===Node.ELEMENT_NODE&&this.element(e,t,n);var o="template"===e.localName?(e.content||e._content).childNodes:e.children||e.childNodes;if(o)for(var r=0;r<o.length;r++)this._transformDom(o[r],t,n)}},{key:"element",value:function(e,t,n){if(t)if(e.classList)n?(e.classList.remove("style-scope"),e.classList.remove(t)):(e.classList.add("style-scope"),e.classList.add(t));else if(e.getAttribute){var o=e.getAttribute(ko);if(n){if(o){var r=o.replace("style-scope","").replace(t,"");ot(e,r)}}else{var i=(o?o+" ":"")+"style-scope "+t;ot(e,i)}}}},{key:"elementStyles",value:function(e,t,n){var o=e.__cssBuild,r="";if(oo||"shady"===o)r=ze(t,n);else{var i=rt(e),s=i.is,a=i.typeExtension;r=this.css(t,s,a,n)+"\n\n"}return r.trim()}},{key:"css",value:function(e,t,n,o){var r=this._calcHostScope(t,n);t=this._calcElementScope(t);var i=this;return ze(e,function(e){e.isScoped||(i.rule(e,t,r),e.isScoped=!0),o&&o(e,t,r)})}},{key:"_calcElementScope",value:function(e){return e?To+e:""}},{key:"_calcHostScope",value:function(e,t){return t?"[is="+e+"]":e}},{key:"rule",value:function(e,t,n){this._transformRule(e,this._transformComplexSelector,t,n)}},{key:"_transformRule",value:function(e,t,n,o){e.selector=e.transformedSelector=this._transformRuleCss(e,t,n,o)}},{key:"_transformRuleCss",value:function(e,t,n,o){var r=e.selector.split(yo);if(!Xe(e))for(var i,s=0,a=r.length;s<a&&(i=r[s]);s++)r[s]=t.call(this,i,n,o);return r.join(yo)}},{key:"_transformComplexSelector",value:function(e,t,n){var o=this,r=!1;return e=e.trim(),e=e.replace(po,function(e,t,n){return":"+t+"("+n.replace(/\s/g,"")+")"}),e=e.replace(Eo,go+" $1"),e=e.replace(mo,function(e,i,s){if(!r){var a=o._transformCompoundSelector(s,i,t,n);r=r||a.stop,i=a.combinator,s=a.value}return i+s})}},{key:"_transformCompoundSelector",value:function(e,t,n,o){var r=e.indexOf(wo);e.indexOf(go)>=0?e=this._transformHostSelector(e,o):0!==r&&(e=n?this._transformSimpleSelector(e,n):e);var i=!1;r>=0&&(t="",i=!0);var s=void 0;return i&&(s=!0,i&&(e=e.replace(No,function(e,t){return" > "+t}))),e=e.replace(Co,function(e,t,n){return'[dir="'+n+'"] '+t+", "+t+'[dir="'+n+'"]'}),{value:e,combinator:t,stop:s}}},{key:"_transformSimpleSelector",value:function(e,t){var n=e.split(Ao);return n[0]+=t,n.join(Ao)}},{key:"_transformHostSelector",value:function(e,t){var n=e.match(bo),o=n&&n[2].trim()||"";if(o){if(o[0].match(vo))return e.replace(bo,function(e,n,o){return t+o});return o.split(vo)[0]===t?o:Oo}return e.replace(go,t)}},{key:"documentRule",value:function(e){e.selector=e.parsedSelector,this.normalizeRootSelector(e),this._transformRule(e,this._transformDocumentSelector)}},{key:"normalizeRootSelector",value:function(e){e.selector===So&&(e.selector="html")}},{key:"_transformDocumentSelector",value:function(e){return e.match(wo)?this._transformComplexSelector(e,_o):this._transformSimpleSelector(e.trim(),_o)}},{key:"SCOPE_NAME",get:function(){return"style-scope"}}]),e}(),po=/:(nth[-\w]+)\(([^)]+)\)/,_o=":not(.style-scope)",yo=",",mo=/(^|[\s>+~]+)((?:\[.+?\]|[^\s>+~=[])+)/g,vo=/[[.:#*]/,go=":host",So=":root",wo="::slotted",Eo=new RegExp("^("+wo+")"),bo=/(:host)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))/,No=/(?:::slotted)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))/,Co=/(.*):dir\((?:(ltr|rtl))\)/,To=".",Ao=":",ko="class",Oo="should_not_match",Do=new fo,xo=function(){function e(t,n,o,r,i,s){vt(this,e),this.styleRules=t||null,this.placeholder=n||null,this.ownStylePropertyNames=o||[],this.overrideStyleProperties=null,this.elementName=r||"",this.cssBuild=s||"",this.typeExtension=i||"",this.styleProperties=null,this.scopeSelector=null,this.customStyle=null}return gt(e,null,[{key:"get",value:function(e){return e?e.__styleInfo:null}},{key:"set",value:function(e,t){return e.__styleInfo=t,t}}]),gt(e,[{key:"_getStyleRules",value:function(){return this.styleRules}}]),e}();xo.prototype._getStyleRules=xo.prototype._getStyleRules;/**
+var br=/(?:^|[;\s{]\s*)(--[\w-]*?)\s*:\s*(?:((?:'(?:\\'|.)*?'|"(?:\\"|.)*?"|\([^)]*?\)|[^};{])+)|\{([^}]*)\}(?:(?=[;\s}])|$))/gi,Nr=/(?:^|\W+)@apply\s*\(?([^);\n]*)\)?/gi,Cr=/(--[\w-]+)\s*([:,;)]|$)/gi,Tr=/(animation\s*:)|(animation-name\s*:)/,Ar=/@media\s(.*)/,Dr=/\{[^}]*\}/g,kr=new Set,Or="shady-unscoped",xr=null,Mr=function(){function e(){on(this,e)}return rn(e,[{key:"dom",value:function(e,t,n){e.__styleScoped?e.__styleScoped=null:this._transformDom(e,t||"",n)}},{key:"_transformDom",value:function(e,t,n){e.nodeType===Node.ELEMENT_NODE&&this.element(e,t,n);var o="template"===e.localName?(e.content||e._content).childNodes:e.children||e.childNodes;if(o)for(var r=0;r<o.length;r++)this._transformDom(o[r],t,n)}},{key:"element",value:function(e,t,n){if(t)if(e.classList)n?(e.classList.remove("style-scope"),e.classList.remove(t)):(e.classList.add("style-scope"),e.classList.add(t));else if(e.getAttribute){var o=e.getAttribute(Yr);if(n){if(o){var r=o.replace("style-scope","").replace(t,"");qt(e,r)}}else{var i=(o?o+" ":"")+"style-scope "+t;qt(e,i)}}}},{key:"elementStyles",value:function(e,t,n){var o=e.__cssBuild,r="";if(wr||"shady"===o)r=xt(t,n);else{var i=Ut(e),s=i.is,a=i.typeExtension;r=this.css(t,s,a,n)+"\n\n"}return r.trim()}},{key:"css",value:function(e,t,n,o){var r=this._calcHostScope(t,n);t=this._calcElementScope(t);var i=this;return xt(e,function(e){e.isScoped||(i.rule(e,t,r),e.isScoped=!0),o&&o(e,t,r)})}},{key:"_calcElementScope",value:function(e){return e?Vr+e:""}},{key:"_calcHostScope",value:function(e,t){return t?"[is="+e+"]":e}},{key:"rule",value:function(e,t,n){this._transformRule(e,this._transformComplexSelector,t,n)}},{key:"_transformRule",value:function(e,t,n,o){e.selector=e.transformedSelector=this._transformRuleCss(e,t,n,o)}},{key:"_transformRuleCss",value:function(e,t,n,o){var r=e.selector.split(Lr);if(!Pt(e))for(var i,s=0,a=r.length;s<a&&(i=r[s]);s++)r[s]=t.call(this,i,n,o);return r.join(Lr)}},{key:"_twiddleNthPlus",value:function(e){return e.replace(Pr,function(e,t,n){return n.indexOf("+")>-1?n=n.replace(/\+/g,"___"):n.indexOf("___")>-1&&(n=n.replace(/___/g,"+")),":"+t+"("+n+")"})}},{key:"_transformComplexSelector",value:function(e,t,n){var o=this,r=!1;e=e.trim();var i=Pr.test(e);return i&&(e=e.replace(Pr,function(e,t,n){return":"+t+"("+n.replace(/\s/g,"")+")"}),e=this._twiddleNthPlus(e)),e=e.replace(qr,Ir+" $1"),e=e.replace(Fr,function(e,i,s){if(!r){var a=o._transformCompoundSelector(s,i,t,n);r=r||a.stop,i=a.combinator,s=a.value}return i+s}),i&&(e=this._twiddleNthPlus(e)),e}},{key:"_transformCompoundSelector",value:function(e,t,n,o){var r=e.indexOf(Br);e.indexOf(Ir)>=0?e=this._transformHostSelector(e,o):0!==r&&(e=n?this._transformSimpleSelector(e,n):e);var i=!1;r>=0&&(t="",i=!0);var s=void 0;return i&&(s=!0,i&&(e=e.replace(Wr,function(e,t){return" > "+t}))),e=e.replace(Kr,function(e,t,n){return'[dir="'+n+'"] '+t+", "+t+'[dir="'+n+'"]'}),{value:e,combinator:t,stop:s}}},{key:"_transformSimpleSelector",value:function(e,t){var n=e.split(Gr);return n[0]+=t,n.join(Gr)}},{key:"_transformHostSelector",value:function(e,t){var n=e.match(Ur),o=n&&n[2].trim()||"";if(o){if(o[0].match(jr))return e.replace(Ur,function(e,n,o){return t+o});return o.split(jr)[0]===t?o:zr}return e.replace(Ir,t)}},{key:"documentRule",value:function(e){e.selector=e.parsedSelector,this.normalizeRootSelector(e),this._transformRule(e,this._transformDocumentSelector)}},{key:"normalizeRootSelector",value:function(e){e.selector===Hr&&(e.selector="html")}},{key:"_transformDocumentSelector",value:function(e){return e.match(Br)?this._transformComplexSelector(e,Rr):this._transformSimpleSelector(e.trim(),Rr)}},{key:"SCOPE_NAME",get:function(){return"style-scope"}}]),e}(),Pr=/:(nth[-\w]+)\(([^)]+)\)/,Rr=":not(.style-scope)",Lr=",",Fr=/(^|[\s>+~]+)((?:\[.+?\]|[^\s>+~=[])+)/g,jr=/[[.:#*]/,Ir=":host",Hr=":root",Br="::slotted",qr=new RegExp("^("+Br+")"),Ur=/(:host)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))/,Wr=/(?:::slotted)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))/,Kr=/(.*):dir\((?:(ltr|rtl))\)/,Vr=".",Gr=":",Yr="class",zr="should_not_match",Xr=new Mr,$r=function(){function e(t,n,o,r,i,s){on(this,e),this.styleRules=t||null,this.placeholder=n||null,this.ownStylePropertyNames=o||[],this.overrideStyleProperties=null,this.elementName=r||"",this.cssBuild=s||"",this.typeExtension=i||"",this.styleProperties=null,this.scopeSelector=null,this.customStyle=null}return rn(e,null,[{key:"get",value:function(e){return e?e.__styleInfo:null}},{key:"set",value:function(e,t){return e.__styleInfo=t,t}}]),rn(e,[{key:"_getStyleRules",value:function(){return this.styleRules}}]),e}();$r.prototype._getStyleRules=$r.prototype._getStyleRules;/**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -151,7 +142,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var Mo=function(e){return e.matches||e.matchesSelector||e.mozMatchesSelector||e.msMatchesSelector||e.oMatchesSelector||e.webkitMatchesSelector}(window.Element.prototype),Po=navigator.userAgent.match("Trident"),Ro=function(){function e(){vt(this,e)}return gt(e,[{key:"decorateStyles",value:function(e){var t=this,n={},o=[],r=0;$e(e,function(e){t.decorateRule(e),e.index=r++,t.collectPropertiesInCssText(e.propertyInfo.cssText,n)},function(e){o.push(e)}),e._keyframes=o;var i=[];for(var s in n)i.push(s);return i}},{key:"decorateRule",value:function(e){if(e.propertyInfo)return e.propertyInfo;var t={},n={};return this.collectProperties(e,n)&&(t.properties=n,e.rules=null),t.cssText=this.collectCssText(e),e.propertyInfo=t,t}},{key:"collectProperties",value:function(e,t){var n=e.propertyInfo;if(!n){for(var o=void 0,r=io,i=e.parsedCssText,s=void 0,a=void 0;o=r.exec(i);)s=(o[2]||o[3]).trim(),"inherit"===s&&"unset"===s||(t[o[1].trim()]=s),a=!0;return a}if(n.properties)return Object.assign(t,n.properties),!0}},{key:"collectCssText",value:function(e){return this.collectConsumingCssText(e.parsedCssText)}},{key:"collectConsumingCssText",value:function(e){return e.replace(uo,"").replace(io,"")}},{key:"collectPropertiesInCssText",value:function(e,t){for(var n=void 0;n=ao.exec(e);){var o=n[1];":"!==n[2]&&(t[o]=!0)}}},{key:"reify",value:function(e){for(var t,n=Object.getOwnPropertyNames(e),o=0;o<n.length;o++)t=n[o],e[t]=this.valueForProperty(e[t],e)}},{key:"valueForProperty",value:function(e,t){if(e)if(e.indexOf(";")>=0)e=this.valueForProperties(e,t);else{var n=this,o=function(e,o,r,i){if(!o)return e+i;var s=n.valueForProperty(t[o],t);return s&&"initial"!==s?"apply-shim-inherit"===s&&(s="inherit"):s=n.valueForProperty(t[r]||r,t)||r,e+(s||"")+i};e=nt(e,o)}return e&&e.trim()||""}},{key:"valueForProperties",value:function(e,t){for(var n,o,r=e.split(";"),i=0;i<r.length;i++)if(n=r[i]){if(so.lastIndex=0,o=so.exec(n))n=this.valueForProperty(t[o[1]],t);else{var s=n.indexOf(":");if(-1!==s){var a=n.substring(s);a=a.trim(),a=this.valueForProperty(a,t)||a,n=n.substring(0,s)+a}}r[i]=n&&n.lastIndexOf(";")===n.length-1?n.slice(0,-1):n||""}return r.join(";")}},{key:"applyProperties",value:function(e,t){var n="";e.propertyInfo||this.decorateRule(e),e.propertyInfo.cssText&&(n=this.valueForProperties(e.propertyInfo.cssText,t)),e.cssText=n}},{key:"applyKeyframeTransforms",value:function(e,t){var n=e.cssText,o=e.cssText;if(null==e.hasAnimations&&(e.hasAnimations=lo.test(n)),e.hasAnimations){var r=void 0;if(null==e.keyframeNamesToTransform){e.keyframeNamesToTransform=[];for(var i in t)r=t[i],o=r(n),n!==o&&(n=o,e.keyframeNamesToTransform.push(i))}else{for(var s=0;s<e.keyframeNamesToTransform.length;++s)r=t[e.keyframeNamesToTransform[s]],n=r(n);o=n}}e.cssText=o}},{key:"propertyDataFromStyles",value:function(e,t){var n={},o=this,r=[];return $e(e,function(e){e.propertyInfo||o.decorateRule(e);var i=e.transformedSelector||e.parsedSelector;t&&e.propertyInfo.properties&&i&&Mo.call(t,i)&&(o.collectProperties(e,n),it(e.index,r))},null,!0),{properties:n,key:r}}},{key:"whenHostOrRootRule",value:function(e,t,n,o){if(t.propertyInfo||this.decorateRule(t),t.propertyInfo.properties){var r=rt(e),i=r.is,s=r.typeExtension,a=i?Do._calcHostScope(i,s):"html",l=t.parsedSelector,c=":host > *"===l||"html"===l,u=0===l.indexOf(":host")&&!c;if("shady"===n&&(c=l===a+" > *."+a||-1!==l.indexOf("html"),u=!c&&0===l.indexOf(a)),"shadow"===n&&(c=":host > *"===l||"html"===l,u=u&&!c),c||u){var d=a;u&&(oo&&!t.transformedSelector&&(t.transformedSelector=Do._transformRuleCss(t,Do._transformComplexSelector,Do._calcElementScope(i),a)),d=t.transformedSelector||a),o({selector:d,isHost:u,isRoot:c})}}}},{key:"hostAndRootPropertiesForScope",value:function(e,t){var n={},o={},r=this,i=t&&t.__cssBuild;return $e(t,function(t){r.whenHostOrRootRule(e,t,i,function(i){var s=e._element||e;Mo.call(s,i.selector)&&(i.isHost?r.collectProperties(t,n):r.collectProperties(t,o))})},null,!0),{rootProps:o,hostProps:n}}},{key:"transformStyles",value:function(e,t,n){var o=this,r=rt(e),i=r.is,s=r.typeExtension,a=Do._calcHostScope(i,s),l=e.extends?"\\"+a.slice(0,-1)+"\\]":a,c=new RegExp("(?:^|[^.#[:])"+l+"($|[.:[\\s>+~])"),u=xo.get(e).styleRules,d=this._elementKeyframeTransforms(e,u,n);return Do.elementStyles(e,u,function(e){o.applyProperties(e,t),oo||Xe(e)||!e.cssText||(o.applyKeyframeTransforms(e,d),o._scopeSelector(e,c,a,n))})}},{key:"_elementKeyframeTransforms",value:function(e,t,n){var o=t._keyframes,r={};if(!oo&&o)for(var i=0,s=o[i];i<o.length;s=o[++i])this._scopeKeyframes(s,n),r[s.keyframesName]=this._keyframesRuleTransformer(s);return r}},{key:"_keyframesRuleTransformer",value:function(e){return function(t){return t.replace(e.keyframesNameRx,e.transformedKeyframesName)}}},{key:"_scopeKeyframes",value:function(e,t){e.keyframesNameRx=new RegExp(e.keyframesName,"g"),e.transformedKeyframesName=e.keyframesName+"-"+t,e.transformedSelector=e.transformedSelector||e.selector,e.selector=e.transformedSelector.replace(e.keyframesName,e.transformedKeyframesName)}},{key:"_scopeSelector",value:function(e,t,n,o){e.transformedSelector=e.transformedSelector||e.selector;for(var r,i=e.transformedSelector,s="."+o,a=i.split(","),l=0,c=a.length;l<c&&(r=a[l]);l++)a[l]=r.match(t)?r.replace(n,s):s+" "+r;e.selector=a.join(",")}},{key:"applyElementScopeSelector",value:function(e,t,n){var o=e.getAttribute("class")||"",r=o;n&&(r=o.replace(new RegExp("\\s*x-scope\\s*"+n+"\\s*","g")," ")),r+=(r?" ":"")+"x-scope "+t,o!==r&&ot(e,r)}},{key:"applyElementStyle",value:function(e,t,n,o){var r=o?o.textContent||"":this.transformStyles(e,t,n),i=xo.get(e),s=i.customStyle;return s&&!oo&&s!==o&&--s._useCount<=0&&s.parentNode&&s.parentNode.removeChild(s),oo?i.customStyle?(i.customStyle.textContent=r,o=i.customStyle):r&&(o=Je(r,n,e.shadowRoot,i.placeholder)):o?o.parentNode||(Po&&r.indexOf("@media")>-1&&(o.textContent=r),et(o,null,i.placeholder)):r&&(o=Je(r,n,null,i.placeholder)),o&&(o._useCount=o._useCount||0,i.customStyle!=o&&o._useCount++,i.customStyle=o),o}},{key:"applyCustomStyle",value:function(e,t){var n=Ge(e),o=this;e.textContent=ze(n,function(e){var n=e.cssText=e.parsedCssText;e.propertyInfo&&e.propertyInfo.cssText&&(n=Ke(n),e.cssText=o.valueForProperties(n,t))})}},{key:"XSCOPE_NAME",get:function(){return"x-scope"}}]),e}(),Lo=new Ro,jo={},Io=window.customElements;if(Io&&!oo){var Fo=Io.define,Ho=function(e,t,n){return jo[e]=Ze(e),Fo.call(Io,e,t,n)};Io.define=Ho}/**
+var Jr=function(e){return e.matches||e.matchesSelector||e.mozMatchesSelector||e.msMatchesSelector||e.oMatchesSelector||e.webkitMatchesSelector}(window.Element.prototype),Qr=navigator.userAgent.match("Trident"),Zr=function(){function e(){on(this,e)}return rn(e,[{key:"decorateStyles",value:function(e){var t=this,n={},o=[],r=0;Rt(e,function(e){t.decorateRule(e),e.index=r++,t.collectPropertiesInCssText(e.propertyInfo.cssText,n)},function(e){o.push(e)}),e._keyframes=o;var i=[];for(var s in n)i.push(s);return i}},{key:"decorateRule",value:function(e){if(e.propertyInfo)return e.propertyInfo;var t={},n={};return this.collectProperties(e,n)&&(t.properties=n,e.rules=null),t.cssText=this.collectCssText(e),e.propertyInfo=t,t}},{key:"collectProperties",value:function(e,t){var n=e.propertyInfo;if(!n){for(var o=void 0,r=br,i=e.parsedCssText,s=void 0,a=void 0;o=r.exec(i);)s=(o[2]||o[3]).trim(),"inherit"===s&&"unset"===s||(t[o[1].trim()]=s),a=!0;return a}if(n.properties)return Object.assign(t,n.properties),!0}},{key:"collectCssText",value:function(e){return this.collectConsumingCssText(e.parsedCssText)}},{key:"collectConsumingCssText",value:function(e){return e.replace(Dr,"").replace(br,"")}},{key:"collectPropertiesInCssText",value:function(e,t){for(var n=void 0;n=Cr.exec(e);){var o=n[1];":"!==n[2]&&(t[o]=!0)}}},{key:"reify",value:function(e){for(var t,n=Object.getOwnPropertyNames(e),o=0;o<n.length;o++)t=n[o],e[t]=this.valueForProperty(e[t],e)}},{key:"valueForProperty",value:function(e,t){if(e)if(e.indexOf(";")>=0)e=this.valueForProperties(e,t);else{var n=this,o=function(e,o,r,i){if(!o)return e+i;var s=n.valueForProperty(t[o],t);return s&&"initial"!==s?"apply-shim-inherit"===s&&(s="inherit"):s=n.valueForProperty(t[r]||r,t)||r,e+(s||"")+i};e=Bt(e,o)}return e&&e.trim()||""}},{key:"valueForProperties",value:function(e,t){for(var n,o,r=e.split(";"),i=0;i<r.length;i++)if(n=r[i]){if(Nr.lastIndex=0,o=Nr.exec(n))n=this.valueForProperty(t[o[1]],t);else{var s=n.indexOf(":");if(-1!==s){var a=n.substring(s);a=a.trim(),a=this.valueForProperty(a,t)||a,n=n.substring(0,s)+a}}r[i]=n&&n.lastIndexOf(";")===n.length-1?n.slice(0,-1):n||""}return r.join(";")}},{key:"applyProperties",value:function(e,t){var n="";e.propertyInfo||this.decorateRule(e),e.propertyInfo.cssText&&(n=this.valueForProperties(e.propertyInfo.cssText,t)),e.cssText=n}},{key:"applyKeyframeTransforms",value:function(e,t){var n=e.cssText,o=e.cssText;if(null==e.hasAnimations&&(e.hasAnimations=Tr.test(n)),e.hasAnimations){var r=void 0;if(null==e.keyframeNamesToTransform){e.keyframeNamesToTransform=[];for(var i in t)r=t[i],o=r(n),n!==o&&(n=o,e.keyframeNamesToTransform.push(i))}else{for(var s=0;s<e.keyframeNamesToTransform.length;++s)r=t[e.keyframeNamesToTransform[s]],n=r(n);o=n}}e.cssText=o}},{key:"propertyDataFromStyles",value:function(e,t){var n={},o=this,r=[];return Rt(e,function(e){e.propertyInfo||o.decorateRule(e);var i=e.transformedSelector||e.parsedSelector;t&&e.propertyInfo.properties&&i&&Jr.call(t,i)&&(o.collectProperties(e,n),Kt(e.index,r))},null,!0),{properties:n,key:r}}},{key:"whenHostOrRootRule",value:function(e,t,n,o){if(t.propertyInfo||this.decorateRule(t),t.propertyInfo.properties){var r=Ut(e),i=r.is,s=r.typeExtension,a=i?Xr._calcHostScope(i,s):"html",l=t.parsedSelector,c=":host > *"===l||"html"===l,u=0===l.indexOf(":host")&&!c;if("shady"===n&&(c=l===a+" > *."+a||-1!==l.indexOf("html"),u=!c&&0===l.indexOf(a)),"shadow"===n&&(c=":host > *"===l||"html"===l,u=u&&!c),c||u){var d=a;u&&(wr&&!t.transformedSelector&&(t.transformedSelector=Xr._transformRuleCss(t,Xr._transformComplexSelector,Xr._calcElementScope(i),a)),d=t.transformedSelector||a),o({selector:d,isHost:u,isRoot:c})}}}},{key:"hostAndRootPropertiesForScope",value:function(e,t){var n={},o={},r=this,i=t&&t.__cssBuild;return Rt(t,function(t){r.whenHostOrRootRule(e,t,i,function(i){var s=e._element||e;Jr.call(s,i.selector)&&(i.isHost?r.collectProperties(t,n):r.collectProperties(t,o))})},null,!0),{rootProps:o,hostProps:n}}},{key:"transformStyles",value:function(e,t,n){var o=this,r=Ut(e),i=r.is,s=r.typeExtension,a=Xr._calcHostScope(i,s),l=e.extends?"\\"+a.slice(0,-1)+"\\]":a,c=new RegExp("(?:^|[^.#[:])"+l+"($|[.:[\\s>+~])"),u=$r.get(e).styleRules,d=this._elementKeyframeTransforms(e,u,n);return Xr.elementStyles(e,u,function(e){o.applyProperties(e,t),wr||Pt(e)||!e.cssText||(o.applyKeyframeTransforms(e,d),o._scopeSelector(e,c,a,n))})}},{key:"_elementKeyframeTransforms",value:function(e,t,n){var o=t._keyframes,r={};if(!wr&&o)for(var i=0,s=o[i];i<o.length;s=o[++i])this._scopeKeyframes(s,n),r[s.keyframesName]=this._keyframesRuleTransformer(s);return r}},{key:"_keyframesRuleTransformer",value:function(e){return function(t){return t.replace(e.keyframesNameRx,e.transformedKeyframesName)}}},{key:"_scopeKeyframes",value:function(e,t){e.keyframesNameRx=new RegExp("\\b"+e.keyframesName+"(?!\\B|-)","g"),e.transformedKeyframesName=e.keyframesName+"-"+t,e.transformedSelector=e.transformedSelector||e.selector,e.selector=e.transformedSelector.replace(e.keyframesName,e.transformedKeyframesName)}},{key:"_scopeSelector",value:function(e,t,n,o){e.transformedSelector=e.transformedSelector||e.selector;for(var r,i=e.transformedSelector,s="."+o,a=i.split(","),l=0,c=a.length;l<c&&(r=a[l]);l++)a[l]=r.match(t)?r.replace(n,s):s+" "+r;e.selector=a.join(",")}},{key:"applyElementScopeSelector",value:function(e,t,n){var o=e.getAttribute("class")||"",r=o;n&&(r=o.replace(new RegExp("\\s*x-scope\\s*"+n+"\\s*","g")," ")),r+=(r?" ":"")+"x-scope "+t,o!==r&&qt(e,r)}},{key:"applyElementStyle",value:function(e,t,n,o){var r=o?o.textContent||"":this.transformStyles(e,t,n),i=$r.get(e),s=i.customStyle;return s&&!wr&&s!==o&&--s._useCount<=0&&s.parentNode&&s.parentNode.removeChild(s),wr?i.customStyle?(i.customStyle.textContent=r,o=i.customStyle):r&&(o=Lt(r,n,e.shadowRoot,i.placeholder)):o?o.parentNode||(Qr&&r.indexOf("@media")>-1&&(o.textContent=r),It(o,null,i.placeholder)):r&&(o=Lt(r,n,null,i.placeholder)),o&&(o._useCount=o._useCount||0,i.customStyle!=o&&o._useCount++,i.customStyle=o),o}},{key:"applyCustomStyle",value:function(e,t){var n=Mt(e),o=this;e.textContent=xt(n,function(e){var n=e.cssText=e.parsedCssText;e.propertyInfo&&e.propertyInfo.cssText&&(n=Tt(n),e.cssText=o.valueForProperties(n,t))})}},{key:"XSCOPE_NAME",get:function(){return"x-scope"}}]),e}(),ei=new Zr,ti={},ni=window.customElements;if(ni&&!wr){var oi=ni.define,ri=function(e,t,n){return ti[e]=jt(e),oi.call(ni,e,t,n)};ni.define=ri}/**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -160,7 +151,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var Bo=function(){function e(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:100;vt(this,e),this.cache={},this.typeMax=t}return gt(e,[{key:"_validate",value:function(e,t,n){for(var o=0;o<n.length;o++){var r=n[o];if(e.properties[r]!==t[r])return!1}return!0}},{key:"store",value:function(e,t,n,o){var r=this.cache[e]||[];r.push({properties:t,styleElement:n,scopeSelector:o}),r.length>this.typeMax&&r.shift(),this.cache[e]=r}},{key:"fetch",value:function(e,t,n){var o=this.cache[e];if(o)for(var r=o.length-1;r>=0;r--){var i=o[r];if(this._validate(i,t,n))return i}}}]),e}(),Uo=function(){};if(!oo){var Wo=new MutationObserver(lt),qo=function(e){Wo.observe(e,{childList:!0,subtree:!0})};if(window.customElements&&!window.customElements.polyfillWrapFlushCallback)qo(document);else{var Ko=function(){qo(document.body)};window.HTMLImports?window.HTMLImports.whenReady(Ko):requestAnimationFrame(function(){if("loading"===document.readyState){var e=function e(){Ko(),document.removeEventListener("readystatechange",e)};document.addEventListener("readystatechange",e)}else Ko()})}Uo=function(){lt(Wo.takeRecords())}}/**
+var ii=function(){function e(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:100;on(this,e),this.cache={},this.typeMax=t}return rn(e,[{key:"_validate",value:function(e,t,n){for(var o=0;o<n.length;o++){var r=n[o];if(e.properties[r]!==t[r])return!1}return!0}},{key:"store",value:function(e,t,n,o){var r=this.cache[e]||[];r.push({properties:t,styleElement:n,scopeSelector:o}),r.length>this.typeMax&&r.shift(),this.cache[e]=r}},{key:"fetch",value:function(e,t,n){var o=this.cache[e];if(o)for(var r=o.length-1;r>=0;r--){var i=o[r];if(this._validate(i,t,n))return i}}}]),e}(),si=function(){};if(!wr){var ai=new MutationObserver(Yt),li=function(e){ai.observe(e,{childList:!0,subtree:!0})};if(window.customElements&&!window.customElements.polyfillWrapFlushCallback)li(document);else{var ci=function(){li(document.body)};window.HTMLImports?window.HTMLImports.whenReady(ci):requestAnimationFrame(function(){if("loading"===document.readyState){var e=function e(){ci(),document.removeEventListener("readystatechange",e)};document.addEventListener("readystatechange",e)}else ci()})}si=function(){Yt(ai.takeRecords())}}/**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -169,7 +160,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var Vo={},Yo="_applyShimCurrentVersion",zo="_applyShimNextVersion",Go="_applyShimValidatingVersion",Xo=Promise.resolve(),$o=null,Jo=window.HTMLImports&&window.HTMLImports.whenReady||null,Qo=void 0,Zo="__shadyCSSCachedStyle",er=null,tr=null,nr=function(){function e(){vt(this,e),this.customStyles=[],this.enqueued=!1}return gt(e,[{key:"enqueueDocumentValidation",value:function(){!this.enqueued&&tr&&(this.enqueued=!0,pt(tr))}},{key:"addCustomStyle",value:function(e){e.__seenByShadyCSS||(e.__seenByShadyCSS=!0,this.customStyles.push(e),this.enqueueDocumentValidation())}},{key:"getStyleForCustomStyle",value:function(e){if(e[Zo])return e[Zo];return e.getStyle?e.getStyle():e}},{key:"processStyles",value:function(){for(var e=this.customStyles,t=0;t<e.length;t++){var n=e[t];if(!n[Zo]){var o=this.getStyleForCustomStyle(n);if(o){var r=o.__appliedElement||o;er&&er(r),n[Zo]=r}}}return e}}]),e}();nr.prototype.addCustomStyle=nr.prototype.addCustomStyle,nr.prototype.getStyleForCustomStyle=nr.prototype.getStyleForCustomStyle,nr.prototype.processStyles=nr.prototype.processStyles,Object.defineProperties(nr.prototype,{transformCallback:{get:function(){return er},set:function(e){er=e}},validateCallback:{get:function(){return tr},set:function(e){var t=!1;tr||(t=!0),tr=e,t&&this.enqueueDocumentValidation()}}});/**
+var ui={},di="_applyShimCurrentVersion",hi="_applyShimNextVersion",pi="_applyShimValidatingVersion",fi=Promise.resolve(),_i=null,mi=window.HTMLImports&&window.HTMLImports.whenReady||null,yi=void 0,vi="__shadyCSSCachedStyle",gi=null,Si=null,wi=function(){function e(){on(this,e),this.customStyles=[],this.enqueued=!1}return rn(e,[{key:"enqueueDocumentValidation",value:function(){!this.enqueued&&Si&&(this.enqueued=!0,Zt(Si))}},{key:"addCustomStyle",value:function(e){e.__seenByShadyCSS||(e.__seenByShadyCSS=!0,this.customStyles.push(e),this.enqueueDocumentValidation())}},{key:"getStyleForCustomStyle",value:function(e){if(e[vi])return e[vi];return e.getStyle?e.getStyle():e}},{key:"processStyles",value:function(){for(var e=this.customStyles,t=0;t<e.length;t++){var n=e[t];if(!n[vi]){var o=this.getStyleForCustomStyle(n);if(o){var r=o.__appliedElement||o;gi&&gi(r),n[vi]=r}}}return e}}]),e}();wi.prototype.addCustomStyle=wi.prototype.addCustomStyle,wi.prototype.getStyleForCustomStyle=wi.prototype.getStyleForCustomStyle,wi.prototype.processStyles=wi.prototype.processStyles,Object.defineProperties(wi.prototype,{transformCallback:{get:function(){return gi},set:function(e){gi=e}},validateCallback:{get:function(){return Si},set:function(e){var t=!1;Si||(t=!0),Si=e,t&&this.enqueueDocumentValidation()}}});/**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -178,7 +169,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var or=new Bo,rr=function(){function e(){var t=this;vt(this,e),this._scopeCounter={},this._documentOwner=document.documentElement;var n=new Xn;n.rules=[],this._documentOwnerStyleInfo=xo.set(this._documentOwner,new xo(n)),this._elementsHaveApplied=!1,this._applyShim=null,this._customStyleInterface=null,pt(function(){t._ensure()})}return gt(e,[{key:"flush",value:function(){Uo()}},{key:"_generateScopeSelector",value:function(e){return e+"-"+(this._scopeCounter[e]=(this._scopeCounter[e]||0)+1)}},{key:"getStyleAst",value:function(e){return Ge(e)}},{key:"styleAstToString",value:function(e){return ze(e)}},{key:"_gatherStyles",value:function(e){for(var t=e.content.querySelectorAll("style"),n=[],o=0;o<t.length;o++){var r=t[o];n.push(r.textContent),r.parentNode.removeChild(r)}return n.join("").trim()}},{key:"_getCssBuild",value:function(e){var t=e.content.querySelector("style");return t?t.getAttribute("css-build")||"":""}},{key:"prepareTemplate",value:function(e,t,n){if(!e._prepared){e._prepared=!0,e.name=t,e.extends=n,Vo[t]=e;var o=this._getCssBuild(e),r=this._gatherStyles(e),i={is:t,extends:n,__cssBuild:o};oo||Do.dom(e.content,t),this._ensure();var s=yt(r),a=je(r);s&&ro&&this._applyShim&&this._applyShim.transformRules(a,t),e._styleAst=a,e._cssBuild=o;var l=[];if(ro||(l=Lo.decorateStyles(e._styleAst,i)),!l.length||ro){var c=oo?e.content:null,u=jo[t],d=this._generateStaticStyle(i,e._styleAst,c,u);e._style=d}e._ownPropertyNames=l}}},{key:"_generateStaticStyle",value:function(e,t,n,o){var r=Do.elementStyles(e,t);if(r.length)return Je(r,e.is,n,o)}},{key:"_prepareHost",value:function(e){var t=rt(e),n=t.is,o=t.typeExtension,r=jo[n],i=Vo[n],s=void 0,a=void 0,l=void 0;return i&&(s=i._styleAst,a=i._ownPropertyNames,l=i._cssBuild),xo.set(e,new xo(s,r,a,n,o,l))}},{key:"_ensureApplyShim",value:function(){this._applyShim||window.ShadyCSS&&window.ShadyCSS.ApplyShim&&(this._applyShim=window.ShadyCSS.ApplyShim,this._applyShim.invalidCallback=ct)}},{key:"_ensureCustomStyleInterface",value:function(){var e=this;this._customStyleInterface||window.ShadyCSS&&window.ShadyCSS.CustomStyleInterface&&(this._customStyleInterface=window.ShadyCSS.CustomStyleInterface,this._customStyleInterface.transformCallback=function(t){e.transformCustomStyleForDocument(t)},this._customStyleInterface.validateCallback=function(){requestAnimationFrame(function(){(e._customStyleInterface.enqueued||e._elementsHaveApplied)&&e.flushCustomStyles()})})}},{key:"_ensure",value:function(){this._ensureApplyShim(),this._ensureCustomStyleInterface()}},{key:"flushCustomStyles",value:function(){if(this._ensure(),this._customStyleInterface){var e=this._customStyleInterface.processStyles();this._customStyleInterface.enqueued&&(ro?this._revalidateCustomStyleApplyShim(e):(this._updateProperties(this._documentOwner,this._documentOwnerStyleInfo),this._applyCustomStyles(e)),this._customStyleInterface.enqueued=!1,this._elementsHaveApplied&&!ro&&this.styleDocument())}}},{key:"styleElement",value:function(e,t){var n=rt(e),o=n.is,r=xo.get(e);if(r||(r=this._prepareHost(e)),this._isRootOwner(e)||(this._elementsHaveApplied=!0),t&&(r.overrideStyleProperties=r.overrideStyleProperties||{},Object.assign(r.overrideStyleProperties,t)),ro){r.overrideStyleProperties&&_t(e,r.overrideStyleProperties);var i=Vo[o];if(!i&&!this._isRootOwner(e))return;if(i&&i._style&&!dt(i)){if(ht(i)||(this._ensure(),this._applyShim&&this._applyShim.transformRules(i._styleAst,o),i._style.textContent=Do.elementStyles(e,r.styleRules),ft(i)),oo){var s=e.shadowRoot;if(s){s.querySelector("style").textContent=Do.elementStyles(e,r.styleRules)}}r.styleRules=i._styleAst}}else this._updateProperties(e,r),r.ownStylePropertyNames&&r.ownStylePropertyNames.length&&this._applyStyleProperties(e,r)}},{key:"_styleOwnerForNode",value:function(e){var t=e.getRootNode(),n=t.host;return n?xo.get(n)?n:this._styleOwnerForNode(n):this._documentOwner}},{key:"_isRootOwner",value:function(e){return e===this._documentOwner}},{key:"_applyStyleProperties",value:function(e,t){var n=rt(e).is,o=or.fetch(n,t.styleProperties,t.ownStylePropertyNames),r=o&&o.scopeSelector,i=o?o.styleElement:null,s=t.scopeSelector;t.scopeSelector=r||this._generateScopeSelector(n);var a=Lo.applyElementStyle(e,t.styleProperties,t.scopeSelector,i);return oo||Lo.applyElementScopeSelector(e,t.scopeSelector,s),o||or.store(n,t.styleProperties,a,t.scopeSelector),a}},{key:"_updateProperties",value:function(e,t){var n=this._styleOwnerForNode(e),o=xo.get(n),r=o.styleProperties,i=Object.create(r||null),s=Lo.hostAndRootPropertiesForScope(e,t.styleRules),a=Lo.propertyDataFromStyles(o.styleRules,e),l=a.properties;Object.assign(i,s.hostProps,l,s.rootProps),this._mixinOverrideStyles(i,t.overrideStyleProperties),Lo.reify(i),t.styleProperties=i}},{key:"_mixinOverrideStyles",value:function(e,t){for(var n in t){var o=t[n];(o||0===o)&&(e[n]=o)}}},{key:"styleDocument",value:function(e){this.styleSubtree(this._documentOwner,e)}},{key:"styleSubtree",value:function(e,t){var n=e.shadowRoot;(n||this._isRootOwner(e))&&this.styleElement(e,t);var o=n&&(n.children||n.childNodes);if(o)for(var r=0;r<o.length;r++){var i=o[r];this.styleSubtree(i)}else{var s=e.children||e.childNodes;if(s)for(var a=0;a<s.length;a++){var l=s[a];this.styleSubtree(l)}}}},{key:"_revalidateCustomStyleApplyShim",value:function(e){for(var t=0;t<e.length;t++){var n=e[t],o=this._customStyleInterface.getStyleForCustomStyle(n);o&&this._revalidateApplyShim(o)}}},{key:"_applyCustomStyles",value:function(e){for(var t=0;t<e.length;t++){var n=e[t],o=this._customStyleInterface.getStyleForCustomStyle(n);o&&Lo.applyCustomStyle(o,this._documentOwnerStyleInfo.styleProperties)}}},{key:"transformCustomStyleForDocument",value:function(e){var t=this,n=Ge(e);$e(n,function(e){oo?Do.normalizeRootSelector(e):Do.documentRule(e),ro&&(t._ensure(),t._applyShim&&t._applyShim.transformRule(e))}),ro?e.textContent=ze(n):this._documentOwnerStyleInfo.styleRules.rules.push(n)}},{key:"_revalidateApplyShim",value:function(e){if(ro&&this._applyShim){var t=Ge(e);this._ensure(),this._applyShim.transformRules(t),e.textContent=ze(t)}}},{key:"getComputedStyleValue",value:function(e,t){var n=void 0;if(!ro){n=(xo.get(e)||xo.get(this._styleOwnerForNode(e))).styleProperties[t]}return n=n||window.getComputedStyle(e).getPropertyValue(t),n?n.trim():""}},{key:"setElementClass",value:function(e,t){var n=e.getRootNode(),o=t?t.split(/\s/):[],r=n.host&&n.host.localName;if(!r){var i=e.getAttribute("class");if(i)for(var s=i.split(/\s/),a=0;a<s.length;a++)if(s[a]===Do.SCOPE_NAME){r=s[a+1];break}}if(r&&o.push(Do.SCOPE_NAME,r),!ro){var l=xo.get(e);l&&l.scopeSelector&&o.push(Lo.XSCOPE_NAME,l.scopeSelector)}ot(e,o.join(" "))}},{key:"_styleInfoForNode",value:function(e){return xo.get(e)}}]),e}();rr.prototype.flush=rr.prototype.flush,rr.prototype.prepareTemplate=rr.prototype.prepareTemplate,rr.prototype.styleElement=rr.prototype.styleElement,rr.prototype.styleDocument=rr.prototype.styleDocument,rr.prototype.styleSubtree=rr.prototype.styleSubtree,rr.prototype.getComputedStyleValue=rr.prototype.getComputedStyleValue,rr.prototype.setElementClass=rr.prototype.setElementClass,rr.prototype._styleInfoForNode=rr.prototype._styleInfoForNode,rr.prototype.transformCustomStyleForDocument=rr.prototype.transformCustomStyleForDocument,rr.prototype.getStyleAst=rr.prototype.getStyleAst,rr.prototype.styleAstToString=rr.prototype.styleAstToString,rr.prototype.flushCustomStyles=rr.prototype.flushCustomStyles,Object.defineProperties(rr.prototype,{nativeShadow:{get:function(){return oo}},nativeCss:{get:function(){return ro}}});/**
+var Ei=new ii,bi=function(){function e(){var t=this;on(this,e),this._scopeCounter={},this._documentOwner=document.documentElement;var n=new pr;n.rules=[],this._documentOwnerStyleInfo=$r.set(this._documentOwner,new $r(n)),this._elementsHaveApplied=!1,this._applyShim=null,this._customStyleInterface=null,Zt(function(){t._ensure()})}return rn(e,[{key:"flush",value:function(){si()}},{key:"_generateScopeSelector",value:function(e){return e+"-"+(this._scopeCounter[e]=(this._scopeCounter[e]||0)+1)}},{key:"getStyleAst",value:function(e){return Mt(e)}},{key:"styleAstToString",value:function(e){return xt(e)}},{key:"_gatherStyles",value:function(e){return Wt(e.content)}},{key:"_getCssBuild",value:function(e){var t=e.content.querySelector("style");return t?t.getAttribute("css-build")||"":""}},{key:"prepareTemplate",value:function(e,t,n){if(!e._prepared){e._prepared=!0,e.name=t,e.extends=n,ui[t]=e;var o=this._getCssBuild(e),r=this._gatherStyles(e),i={is:t,extends:n,__cssBuild:o};wr||Xr.dom(e.content,t),this._ensure();var s=tn(r),a=vt(r);s&&Er&&this._applyShim&&this._applyShim.transformRules(a,t),e._styleAst=a,e._cssBuild=o;var l=[];if(Er||(l=ei.decorateStyles(e._styleAst,i)),!l.length||Er){var c=wr?e.content:null,u=ti[t],d=this._generateStaticStyle(i,e._styleAst,c,u);e._style=d}e._ownPropertyNames=l}}},{key:"_generateStaticStyle",value:function(e,t,n,o){var r=Xr.elementStyles(e,t);if(r.length)return Lt(r,e.is,n,o)}},{key:"_prepareHost",value:function(e){var t=Ut(e),n=t.is,o=t.typeExtension,r=ti[n],i=ui[n],s=void 0,a=void 0,l=void 0;return i&&(s=i._styleAst,a=i._ownPropertyNames,l=i._cssBuild),$r.set(e,new $r(s,r,a,n,o,l))}},{key:"_ensureApplyShim",value:function(){this._applyShim||window.ShadyCSS&&window.ShadyCSS.ApplyShim&&(this._applyShim=window.ShadyCSS.ApplyShim,this._applyShim.invalidCallback=zt)}},{key:"_ensureCustomStyleInterface",value:function(){var e=this;this._customStyleInterface||window.ShadyCSS&&window.ShadyCSS.CustomStyleInterface&&(this._customStyleInterface=window.ShadyCSS.CustomStyleInterface,this._customStyleInterface.transformCallback=function(t){e.transformCustomStyleForDocument(t)},this._customStyleInterface.validateCallback=function(){requestAnimationFrame(function(){(e._customStyleInterface.enqueued||e._elementsHaveApplied)&&e.flushCustomStyles()})})}},{key:"_ensure",value:function(){this._ensureApplyShim(),this._ensureCustomStyleInterface()}},{key:"flushCustomStyles",value:function(){if(this._ensure(),this._customStyleInterface){var e=this._customStyleInterface.processStyles();this._customStyleInterface.enqueued&&(Er?this._revalidateCustomStyleApplyShim(e):(this._updateProperties(this._documentOwner,this._documentOwnerStyleInfo),this._applyCustomStyles(e)),this._customStyleInterface.enqueued=!1,this._elementsHaveApplied&&!Er&&this.styleDocument())}}},{key:"styleElement",value:function(e,t){var n=Ut(e),o=n.is,r=$r.get(e);if(r||(r=this._prepareHost(e)),this._isRootOwner(e)||(this._elementsHaveApplied=!0),t&&(r.overrideStyleProperties=r.overrideStyleProperties||{},Object.assign(r.overrideStyleProperties,t)),Er){r.overrideStyleProperties&&en(e,r.overrideStyleProperties);var i=ui[o];if(!i&&!this._isRootOwner(e))return;if(i&&i._style&&!$t(i)){if(Jt(i)||(this._ensure(),this._applyShim&&this._applyShim.transformRules(i._styleAst,o),i._style.textContent=Xr.elementStyles(e,r.styleRules),Qt(i)),wr){var s=e.shadowRoot;if(s){s.querySelector("style").textContent=Xr.elementStyles(e,r.styleRules)}}r.styleRules=i._styleAst}}else this._updateProperties(e,r),r.ownStylePropertyNames&&r.ownStylePropertyNames.length&&this._applyStyleProperties(e,r)}},{key:"_styleOwnerForNode",value:function(e){var t=e.getRootNode(),n=t.host;return n?$r.get(n)?n:this._styleOwnerForNode(n):this._documentOwner}},{key:"_isRootOwner",value:function(e){return e===this._documentOwner}},{key:"_applyStyleProperties",value:function(e,t){var n=Ut(e).is,o=Ei.fetch(n,t.styleProperties,t.ownStylePropertyNames),r=o&&o.scopeSelector,i=o?o.styleElement:null,s=t.scopeSelector;t.scopeSelector=r||this._generateScopeSelector(n);var a=ei.applyElementStyle(e,t.styleProperties,t.scopeSelector,i);return wr||ei.applyElementScopeSelector(e,t.scopeSelector,s),o||Ei.store(n,t.styleProperties,a,t.scopeSelector),a}},{key:"_updateProperties",value:function(e,t){var n=this._styleOwnerForNode(e),o=$r.get(n),r=o.styleProperties,i=Object.create(r||null),s=ei.hostAndRootPropertiesForScope(e,t.styleRules),a=ei.propertyDataFromStyles(o.styleRules,e),l=a.properties;Object.assign(i,s.hostProps,l,s.rootProps),this._mixinOverrideStyles(i,t.overrideStyleProperties),ei.reify(i),t.styleProperties=i}},{key:"_mixinOverrideStyles",value:function(e,t){for(var n in t){var o=t[n];(o||0===o)&&(e[n]=o)}}},{key:"styleDocument",value:function(e){this.styleSubtree(this._documentOwner,e)}},{key:"styleSubtree",value:function(e,t){var n=e.shadowRoot;(n||this._isRootOwner(e))&&this.styleElement(e,t);var o=n&&(n.children||n.childNodes);if(o)for(var r=0;r<o.length;r++){var i=o[r];this.styleSubtree(i)}else{var s=e.children||e.childNodes;if(s)for(var a=0;a<s.length;a++){var l=s[a];this.styleSubtree(l)}}}},{key:"_revalidateCustomStyleApplyShim",value:function(e){for(var t=0;t<e.length;t++){var n=e[t],o=this._customStyleInterface.getStyleForCustomStyle(n);o&&this._revalidateApplyShim(o)}}},{key:"_applyCustomStyles",value:function(e){for(var t=0;t<e.length;t++){var n=e[t],o=this._customStyleInterface.getStyleForCustomStyle(n);o&&ei.applyCustomStyle(o,this._documentOwnerStyleInfo.styleProperties)}}},{key:"transformCustomStyleForDocument",value:function(e){var t=this,n=Mt(e);Rt(n,function(e){wr?Xr.normalizeRootSelector(e):Xr.documentRule(e),Er&&(t._ensure(),t._applyShim&&t._applyShim.transformRule(e))}),Er?e.textContent=xt(n):this._documentOwnerStyleInfo.styleRules.rules.push(n)}},{key:"_revalidateApplyShim",value:function(e){if(Er&&this._applyShim){var t=Mt(e);this._ensure(),this._applyShim.transformRules(t),e.textContent=xt(t)}}},{key:"getComputedStyleValue",value:function(e,t){var n=void 0;if(!Er){n=($r.get(e)||$r.get(this._styleOwnerForNode(e))).styleProperties[t]}return n=n||window.getComputedStyle(e).getPropertyValue(t),n?n.trim():""}},{key:"setElementClass",value:function(e,t){var n=e.getRootNode(),o=t?t.split(/\s/):[],r=n.host&&n.host.localName;if(!r){var i=e.getAttribute("class");if(i)for(var s=i.split(/\s/),a=0;a<s.length;a++)if(s[a]===Xr.SCOPE_NAME){r=s[a+1];break}}if(r&&o.push(Xr.SCOPE_NAME,r),!Er){var l=$r.get(e);l&&l.scopeSelector&&o.push(ei.XSCOPE_NAME,l.scopeSelector)}qt(e,o.join(" "))}},{key:"_styleInfoForNode",value:function(e){return $r.get(e)}}]),e}();bi.prototype.flush=bi.prototype.flush,bi.prototype.prepareTemplate=bi.prototype.prepareTemplate,bi.prototype.styleElement=bi.prototype.styleElement,bi.prototype.styleDocument=bi.prototype.styleDocument,bi.prototype.styleSubtree=bi.prototype.styleSubtree,bi.prototype.getComputedStyleValue=bi.prototype.getComputedStyleValue,bi.prototype.setElementClass=bi.prototype.setElementClass,bi.prototype._styleInfoForNode=bi.prototype._styleInfoForNode,bi.prototype.transformCustomStyleForDocument=bi.prototype.transformCustomStyleForDocument,bi.prototype.getStyleAst=bi.prototype.getStyleAst,bi.prototype.styleAstToString=bi.prototype.styleAstToString,bi.prototype.flushCustomStyles=bi.prototype.flushCustomStyles,Object.defineProperties(bi.prototype,{nativeShadow:{get:function(){return wr}},nativeCss:{get:function(){return Er}}});/**
 @license
 Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -187,7 +178,7 @@ The complete set of contributors may be found at http://polymer.github.io/CONTRI
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
-var ir=new rr,sr=void 0,ar=void 0;window.ShadyCSS&&(sr=window.ShadyCSS.ApplyShim,ar=window.ShadyCSS.CustomStyleInterface),window.ShadyCSS={ScopingShim:ir,prepareTemplate:function(e,t,n){ir.flushCustomStyles(),ir.prepareTemplate(e,t,n)},styleSubtree:function(e,t){ir.flushCustomStyles(),ir.styleSubtree(e,t)},styleElement:function(e){ir.flushCustomStyles(),ir.styleElement(e)},styleDocument:function(e){ir.flushCustomStyles(),ir.styleDocument(e)},getComputedStyleValue:function(e,t){return ir.getComputedStyleValue(e,t)},nativeCss:ro,nativeShadow:oo},sr&&(window.ShadyCSS.ApplyShim=sr),ar&&(window.ShadyCSS.CustomStyleInterface=ar),/**
+var Ni=new bi,Ci=void 0,Ti=void 0;window.ShadyCSS&&(Ci=window.ShadyCSS.ApplyShim,Ti=window.ShadyCSS.CustomStyleInterface),window.ShadyCSS={ScopingShim:Ni,prepareTemplate:function(e,t,n){Ni.flushCustomStyles(),Ni.prepareTemplate(e,t,n)},styleSubtree:function(e,t){Ni.flushCustomStyles(),Ni.styleSubtree(e,t)},styleElement:function(e){Ni.flushCustomStyles(),Ni.styleElement(e)},styleDocument:function(e){Ni.flushCustomStyles(),Ni.styleDocument(e)},getComputedStyleValue:function(e,t){return Ni.getComputedStyleValue(e,t)},nativeCss:Er,nativeShadow:wr},Ci&&(window.ShadyCSS.ApplyShim=Ci),Ti&&(window.ShadyCSS.CustomStyleInterface=Ti);/**
  * @license
  * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
@@ -196,5 +187,5 @@ var ir=new rr,sr=void 0,ar=void 0;window.ShadyCSS&&(sr=window.ShadyCSS.ApplyShim
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
-function(){var e=document.createElement("style");e.textContent="body {transition: opacity ease-in 0.2s; } \nbody[unresolved] {opacity: 0; display: block; overflow: hidden; position: relative; } \n";var t=document.querySelector("head");t.insertBefore(e,t.firstChild)}()}();
+var Ai=document.createElement("style");Ai.textContent="body {transition: opacity ease-in 0.2s; } \nbody[unresolved] {opacity: 0; display: block; overflow: hidden; position: relative; } \n";var Di=document.querySelector("head");Di.insertBefore(Ai,Di.firstChild)}();
 //# sourceMappingURL=web-component-polyfills.min.js.map
diff --git a/dist/web-component-polyfills.min.js.map b/dist/web-component-polyfills.min.js.map
index 43a01ff..5242c23 100644
--- a/dist/web-component-polyfills.min.js.map
+++ b/dist/web-component-polyfills.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"web-component-polyfills.min.js","sources":["../node_modules/@webcomponents/shadydom/src/utils.js","../node_modules/@webcomponents/shadydom/src/flush.js","../node_modules/@webcomponents/shadydom/src/observe-changes.js","../node_modules/@webcomponents/shadydom/src/innerHTML.js","../node_modules/@webcomponents/shadydom/src/native-tree.js","../node_modules/@webcomponents/shadydom/src/patch-accessors.js","../node_modules/@webcomponents/shadydom/src/logical-tree.js","../node_modules/@webcomponents/shadydom/src/logical-mutation.js","../node_modules/@webcomponents/shadydom/src/patch-events.js","../node_modules/@webcomponents/shadydom/src/array-splice.js","../node_modules/@webcomponents/shadydom/src/attach-shadow.js","../node_modules/@webcomponents/shadydom/src/patch-builtins.js","../node_modules/@webcomponents/custom-elements/src/Utilities.js","../node_modules/@webcomponents/shadycss/src/css-parse.js","../node_modules/@webcomponents/shadycss/src/style-settings.js","../node_modules/@webcomponents/shadycss/src/style-util.js","../node_modules/@webcomponents/shadycss/src/style-properties.js","../node_modules/@webcomponents/shadycss/src/document-watcher.js","../node_modules/@webcomponents/shadycss/src/apply-shim-utils.js","../node_modules/@webcomponents/shadycss/src/document-wait.js","../node_modules/@webcomponents/shadycss/src/common-utils.js","../node_modules/webcomponents-platform/webcomponents-platform.js","../node_modules/@webcomponents/template/template.js","../node_modules/es6-promise/dist/es6-promise.auto.min.js","../node_modules/webcomponents.js/src/pre-polyfill.js","../node_modules/@webcomponents/shadydom/src/native-methods.js","../node_modules/@webcomponents/shadydom/src/shadydom.js","../node_modules/@webcomponents/custom-elements/src/CustomElementState.js","../node_modules/@webcomponents/custom-elements/src/CustomElementInternals.js","../node_modules/@webcomponents/custom-elements/src/DocumentConstructionObserver.js","../node_modules/@webcomponents/custom-elements/src/Deferred.js","../node_modules/@webcomponents/custom-elements/src/CustomElementRegistry.js","../node_modules/@webcomponents/custom-elements/src/Patch/Native.js","../node_modules/@webcomponents/custom-elements/src/AlreadyConstructedMarker.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ParentNode.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ChildNode.js","../node_modules/@webcomponents/custom-elements/src/custom-elements.js","../node_modules/@webcomponents/custom-elements/src/Patch/HTMLElement.js","../node_modules/@webcomponents/custom-elements/src/Patch/Document.js","../node_modules/@webcomponents/custom-elements/src/Patch/Node.js","../node_modules/@webcomponents/custom-elements/src/Patch/Element.js","../node_modules/@webcomponents/shadycss/src/common-regex.js","../node_modules/@webcomponents/shadycss/src/style-transformer.js","../node_modules/@webcomponents/shadycss/src/style-info.js","../node_modules/@webcomponents/shadycss/src/style-placeholder.js","../node_modules/@webcomponents/shadycss/src/style-cache.js","../node_modules/@webcomponents/shadycss/src/template-map.js","../node_modules/@webcomponents/shadycss/src/custom-style-interface.js","../node_modules/@webcomponents/shadycss/src/scoping-shim.js","../node_modules/@webcomponents/shadycss/entrypoints/scoping-shim.js","../node_modules/webcomponents.js/src/unresolved.js"],"sourcesContent":["/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let settings = window['ShadyDOM'] || {};\n\nsettings.hasNativeShadowDOM = Boolean(Element.prototype.attachShadow && Node.prototype.getRootNode);\n\nlet desc = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild');\n\nsettings.hasDescriptors = Boolean(desc && desc.configurable && desc.get);\nsettings.inUse = settings['force'] || !settings.hasNativeShadowDOM;\n\nexport function isTrackingLogicalChildNodes(node) {\n  return (node.__shady && node.__shady.firstChild !== undefined);\n}\n\nexport function isShadyRoot(obj) {\n  return Boolean(obj.__localName === 'ShadyRoot');\n}\n\nexport function ownerShadyRootForNode(node) {\n  let root = node.getRootNode();\n  if (isShadyRoot(root)) {\n    return root;\n  }\n}\n\nlet p = Element.prototype;\nlet matches = p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\n  p.oMatchesSelector || p.webkitMatchesSelector;\n\nexport function matchesSelector(element, selector) {\n  return matches.call(element, selector);\n}\n\nfunction copyOwnProperty(name, source, target) {\n  let pd = Object.getOwnPropertyDescriptor(source, name);\n  if (pd) {\n    Object.defineProperty(target, name, pd);\n  }\n}\n\nexport function extend(target, source) {\n  if (target && source) {\n    let n$ = Object.getOwnPropertyNames(source);\n    for (let i=0, n; (i<n$.length) && (n=n$[i]); i++) {\n      copyOwnProperty(n, source, target);\n    }\n  }\n  return target || source;\n}\n\nexport function extendAll(target, ...sources) {\n  for (let i=0; i < sources.length; i++) {\n    extend(target, sources[i]);\n  }\n  return target;\n}\n\nexport function mixin(target, source) {\n  for (var i in source) {\n    target[i] = source[i];\n  }\n  return target;\n}\n\nexport function patchPrototype(obj, mixin) {\n  let proto = Object.getPrototypeOf(obj);\n  if (!proto.hasOwnProperty('__patchProto')) {\n    let patchProto = Object.create(proto);\n    patchProto.__sourceProto = proto;\n    extend(patchProto, mixin);\n    proto['__patchProto'] = patchProto;\n  }\n  // old browsers don't have setPrototypeOf\n  obj.__proto__ = proto['__patchProto'];\n}\n\n\nlet twiddle = document.createTextNode('');\nlet content = 0;\nlet queue = [];\nnew MutationObserver(() => {\n  while (queue.length) {\n    // catch errors in user code...\n    try {\n      queue.shift()();\n    } catch(e) {\n      // enqueue another record and throw\n      twiddle.textContent = content++;\n      throw(e);\n    }\n  }\n}).observe(twiddle, {characterData: true});\n\n// use MutationObserver to get microtask async timing.\nexport function microtask(callback) {\n  queue.push(callback);\n  twiddle.textContent = content++;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\n// render enqueuer/flusher\nlet flushList = [];\nlet scheduled;\nexport function enqueue(callback) {\n  if (!scheduled) {\n    scheduled = true;\n    utils.microtask(flush);\n  }\n  flushList.push(callback);\n}\n\nexport function flush() {\n  scheduled = false;\n  let didFlush = Boolean(flushList.length);\n  while (flushList.length) {\n    flushList.shift()();\n  }\n  return didFlush;\n}\n\nflush['list'] = flushList;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\nclass AsyncObserver {\n\n  constructor() {\n    this._scheduled = false;\n    this.addedNodes = [];\n    this.removedNodes = [];\n    this.callbacks = new Set();\n  }\n\n  schedule() {\n    if (!this._scheduled) {\n      this._scheduled = true;\n      utils.microtask(() => {\n        this.flush();\n      });\n    }\n  }\n\n  flush() {\n    if (this._scheduled) {\n      this._scheduled = false;\n      let mutations = this.takeRecords();\n      if (mutations.length) {\n        this.callbacks.forEach(function(cb) {\n          cb(mutations);\n        });\n      }\n    }\n  }\n\n  takeRecords() {\n    if (this.addedNodes.length || this.removedNodes.length) {\n      let mutations = [{\n        addedNodes: this.addedNodes,\n        removedNodes: this.removedNodes\n      }];\n      this.addedNodes = [];\n      this.removedNodes = [];\n      return mutations;\n    }\n    return [];\n  }\n\n}\n\n// TODO(sorvell): consider instead polyfilling MutationObserver\n// directly so that users do not have to fork their code.\n// Supporting the entire api may be challenging: e.g. filtering out\n// removed nodes in the wrong scope and seeing non-distributing\n// subtree child mutations.\nexport let observeChildren = function(node, callback) {\n  node.__shady = node.__shady || {};\n  if (!node.__shady.observer) {\n    node.__shady.observer = new AsyncObserver();\n  }\n  node.__shady.observer.callbacks.add(callback);\n  let observer = node.__shady.observer;\n  return {\n    _callback: callback,\n    _observer: observer,\n    _node: node,\n    takeRecords() {\n      return observer.takeRecords()\n    }\n  };\n}\n\nexport let unobserveChildren = function(handle) {\n  let observer = handle && handle._observer;\n  if (observer) {\n    observer.callbacks.delete(handle._callback);\n    if (!observer.callbacks.size) {\n      handle._node.__shady.observer = null;\n    }\n  }\n}\n\nexport function filterMutations(mutations, target) {\n  /** @const {Node} */\n  const targetRootNode = target.getRootNode();\n  return mutations.map(function(mutation) {\n    /** @const {boolean} */\n    const mutationInScope = (targetRootNode === mutation.target.getRootNode());\n    if (mutationInScope && mutation.addedNodes) {\n      let nodes = Array.from(mutation.addedNodes).filter(function(n) {\n        return (targetRootNode === n.getRootNode());\n      });\n      if (nodes.length) {\n        mutation = Object.create(mutation);\n        Object.defineProperty(mutation, 'addedNodes', {\n          value: nodes,\n          configurable: true\n        });\n        return mutation;\n      }\n    } else if (mutationInScope) {\n      return mutation;\n    }\n  }).filter(function(m) { return m});\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n// Cribbed from ShadowDOM polyfill\n// https://github.com/webcomponents/webcomponentsjs/blob/master/src/ShadowDOM/wrappers/HTMLElement.js#L28\n/////////////////////////////////////////////////////////////////////////////\n// innerHTML and outerHTML\n\n// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString\nlet escapeAttrRegExp = /[&\\u00A0\"]/g;\nlet escapeDataRegExp = /[&\\u00A0<>]/g;\n\nfunction escapeReplace(c) {\n  switch (c) {\n    case '&':\n      return '&amp;';\n    case '<':\n      return '&lt;';\n    case '>':\n      return '&gt;';\n    case '\"':\n      return '&quot;';\n    case '\\u00A0':\n      return '&nbsp;';\n  }\n}\n\nfunction escapeAttr(s) {\n  return s.replace(escapeAttrRegExp, escapeReplace);\n}\n\nfunction escapeData(s) {\n  return s.replace(escapeDataRegExp, escapeReplace);\n}\n\nfunction makeSet(arr) {\n  let set = {};\n  for (let i = 0; i < arr.length; i++) {\n    set[arr[i]] = true;\n  }\n  return set;\n}\n\n// http://www.whatwg.org/specs/web-apps/current-work/#void-elements\nlet voidElements = makeSet([\n  'area',\n  'base',\n  'br',\n  'col',\n  'command',\n  'embed',\n  'hr',\n  'img',\n  'input',\n  'keygen',\n  'link',\n  'meta',\n  'param',\n  'source',\n  'track',\n  'wbr'\n]);\n\nlet plaintextParents = makeSet([\n  'style',\n  'script',\n  'xmp',\n  'iframe',\n  'noembed',\n  'noframes',\n  'plaintext',\n  'noscript'\n]);\n\n/**\n * @param {Node} node\n * @param {Node} parentNode\n * @param {Function=} callback\n */\nexport function getOuterHTML(node, parentNode, callback) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE: {\n      let tagName = node.localName;\n      let s = '<' + tagName;\n      let attrs = node.attributes;\n      for (let i = 0, attr; (attr = attrs[i]); i++) {\n        s += ' ' + attr.name + '=\"' + escapeAttr(attr.value) + '\"';\n      }\n      s += '>';\n      if (voidElements[tagName]) {\n        return s;\n      }\n      return s + getInnerHTML(node, callback) + '</' + tagName + '>';\n    }\n    case Node.TEXT_NODE: {\n      let data = /** @type {Text} */ (node).data;\n      if (parentNode && plaintextParents[parentNode.localName]) {\n        return data;\n      }\n      return escapeData(data);\n    }\n    case Node.COMMENT_NODE: {\n      return '<!--' + /** @type {Comment} */ (node).data + '-->';\n    }\n    default: {\n      window.console.error(node);\n      throw new Error('not implemented');\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Function=} callback\n */\nexport function getInnerHTML(node, callback) {\n  if (node.localName === 'template') {\n    node =  /** @type {HTMLTemplateElement} */ (node).content;\n  }\n  let s = '';\n  let c$ = callback ? callback(node) : node.childNodes;\n  for (let i=0, l=c$.length, child; (i<l) && (child=c$[i]); i++) {\n    s += getOuterHTML(child, node, callback);\n  }\n  return s;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {getInnerHTML} from './innerHTML.js';\n\nlet nodeWalker = document.createTreeWalker(document, NodeFilter.SHOW_ALL,\n  null, false);\n\nlet elementWalker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT,\n  null, false);\n\nexport function parentNode(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.parentNode();\n}\n\nexport function firstChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.firstChild();\n}\n\nexport function lastChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.lastChild();\n}\n\nexport function previousSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.previousSibling();\n}\n\nexport function nextSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.nextSibling();\n}\n\nexport function childNodes(node) {\n  let nodes = [];\n  nodeWalker.currentNode = node;\n  let n = nodeWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = nodeWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function parentElement(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.parentNode();\n}\n\nexport function firstElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.firstChild();\n}\n\nexport function lastElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.lastChild();\n}\n\nexport function previousElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.previousSibling();\n}\n\nexport function nextElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.nextSibling();\n}\n\nexport function children(node) {\n  let nodes = [];\n  elementWalker.currentNode = node;\n  let n = elementWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = elementWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function innerHTML(node) {\n  return getInnerHTML(node, (n) => childNodes(n));\n}\n\nexport function textContent(node) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE:\n    case Node.DOCUMENT_FRAGMENT_NODE:\n      let textWalker = document.createTreeWalker(node, NodeFilter.SHOW_TEXT,\n        null, false);\n      let content = '', n;\n      while ( (n = textWalker.nextNode()) ) {\n        // TODO(sorvell): can't use textContent since we patch it on Node.prototype!\n        // However, should probably patch it only on element.\n        content += n.nodeValue;\n      }\n      return content;\n    default:\n      return node.nodeValue;\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {getInnerHTML} from './innerHTML.js';\nimport * as nativeTree from './native-tree.js';\n\nfunction clearNode(node) {\n  while (node.firstChild) {\n    node.removeChild(node.firstChild);\n  }\n}\n\nconst nativeInnerHTMLDesc = /** @type {ObjectPropertyDescriptor} */(\n  Object.getOwnPropertyDescriptor(Element.prototype, 'innerHTML') ||\n  Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerHTML'));\n\nconst inertDoc = document.implementation.createHTMLDocument('inert');\nconst htmlContainer = inertDoc.createElement('div');\n\nconst nativeActiveElementDescriptor =\n  /** @type {ObjectPropertyDescriptor} */(\n    Object.getOwnPropertyDescriptor(Document.prototype, 'activeElement')\n  );\nfunction getDocumentActiveElement() {\n  if (nativeActiveElementDescriptor && nativeActiveElementDescriptor.get) {\n    return nativeActiveElementDescriptor.get.call(document);\n  } else if (!utils.settings.hasDescriptors) {\n    return document.activeElement;\n  }\n}\n\nfunction activeElementForNode(node) {\n  let active = getDocumentActiveElement();\n  // In IE11, activeElement might be an empty object if the document is\n  // contained in an iframe.\n  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10998788/\n  if (!active || !active.nodeType) {\n    return null;\n  }\n  let isShadyRoot = !!(utils.isShadyRoot(node));\n  if (node !== document) {\n    // If this node isn't a document or shady root, then it doesn't have\n    // an active element.\n    if (!isShadyRoot) {\n      return null;\n    }\n    // If this shady root's host is the active element or the active\n    // element is not a descendant of the host (in the composed tree),\n    // then it doesn't have an active element.\n    if (node.host === active ||\n        !node.host.contains(active)) {\n      return null;\n    }\n  }\n  // This node is either the document or a shady root of which the active\n  // element is a (composed) descendant of its host; iterate upwards to\n  // find the active element's most shallow host within it.\n  let activeRoot = utils.ownerShadyRootForNode(active);\n  while (activeRoot && activeRoot !== node) {\n    active = activeRoot.host;\n    activeRoot = utils.ownerShadyRootForNode(active);\n  }\n  if (node === document) {\n    // This node is the document, so activeRoot should be null.\n    return activeRoot ? null : active;\n  } else {\n    // This node is a non-document shady root, and it should be\n    // activeRoot.\n    return activeRoot === node ? active : null;\n  }\n}\n\nlet OutsideAccessors = {\n\n  parentElement: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      if (l && l.nodeType !== Node.ELEMENT_NODE) {\n        l = null;\n      }\n      return l !== undefined ? l : nativeTree.parentElement(this);\n    },\n    configurable: true\n  },\n\n  parentNode: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      return l !== undefined ? l : nativeTree.parentNode(this);\n    },\n    configurable: true\n  },\n\n  nextSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.nextSibling;\n      return l !== undefined ? l : nativeTree.nextSibling(this);\n    },\n    configurable: true\n  },\n\n  previousSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.previousSibling;\n      return l !== undefined ? l : nativeTree.previousSibling(this);\n    },\n    configurable: true\n  },\n\n  className: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.getAttribute('class') || '';\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(value) {\n      this.setAttribute('class', value);\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  nextElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.nextSibling !== undefined) {\n        let n = this.nextSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.nextElementSibling(this);\n      }\n    },\n    configurable: true\n  },\n\n  previousElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.previousSibling !== undefined) {\n        let n = this.previousSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.previousElementSibling(this);\n      }\n    },\n    configurable: true\n  }\n\n};\n\nlet InsideAccessors = {\n\n  childNodes: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let childNodes;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        if (!this.__shady.childNodes) {\n          this.__shady.childNodes = [];\n          for (let n=this.firstChild; n; n=n.nextSibling) {\n            this.__shady.childNodes.push(n);\n          }\n        }\n        childNodes = this.__shady.childNodes;\n      } else {\n        childNodes = nativeTree.childNodes(this);\n      }\n      childNodes.item = function(index) {\n        return childNodes[index];\n      }\n      return childNodes;\n    },\n    configurable: true\n  },\n\n  childElementCount: {\n    /** @this {HTMLElement} */\n    get() {\n      return this.children.length;\n    },\n    configurable: true\n  },\n\n  firstChild: {\n    /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.firstChild;\n      return l !== undefined ? l : nativeTree.firstChild(this);\n    },\n    configurable: true\n  },\n\n  lastChild: {\n  /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.lastChild;\n      return l !== undefined ? l : nativeTree.lastChild(this);\n    },\n    configurable: true\n  },\n\n  textContent: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        let tc = [];\n        for (let i = 0, cn = this.childNodes, c; (c = cn[i]); i++) {\n          if (c.nodeType !== Node.COMMENT_NODE) {\n            tc.push(c.textContent);\n          }\n        }\n        return tc.join('');\n      } else {\n        return nativeTree.textContent(this);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     * @param {string} text\n     */\n    set(text) {\n      switch (this.nodeType) {\n        case Node.ELEMENT_NODE:\n        case Node.DOCUMENT_FRAGMENT_NODE:\n          clearNode(this);\n          this.appendChild(document.createTextNode(text));\n          break;\n        default:\n          // TODO(sorvell): can't do this if patch nodeValue.\n          this.nodeValue = text;\n          break;\n      }\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  firstElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.firstChild !== undefined) {\n        let n = this.firstChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.firstElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  lastElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.lastChild !== undefined) {\n        let n = this.lastChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.lastElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  children: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let children;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        children = Array.prototype.filter.call(this.childNodes, function(n) {\n          return (n.nodeType === Node.ELEMENT_NODE);\n        });\n      } else {\n        children = nativeTree.children(this);\n      }\n      children.item = function(index) {\n        return children[index];\n      }\n      return children;\n    },\n    configurable: true\n  },\n\n  // element (HTMLElement on IE11)\n  innerHTML: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        return getInnerHTML(content);\n      } else {\n        return nativeTree.innerHTML(content);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(text) {\n      let content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      clearNode(content);\n      if (nativeInnerHTMLDesc && nativeInnerHTMLDesc.set) {\n        nativeInnerHTMLDesc.set.call(htmlContainer, text);\n      } else {\n        htmlContainer.innerHTML = text;\n      }\n      while (htmlContainer.firstChild) {\n        content.appendChild(htmlContainer.firstChild);\n      }\n    },\n    configurable: true\n  }\n\n};\n\n// Note: Can be patched on element prototype on all browsers.\n// Must be patched on instance on browsers that support native Shadow DOM\n// but do not have builtin accessors (old Chrome).\nexport let ShadowRootAccessor = {\n\n  shadowRoot: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.__shady && this.__shady.publicRoot || null;\n    },\n    configurable: true\n  }\n};\n\n// Note: Can be patched on document prototype on browsers with builtin accessors.\n// Must be patched separately on simulated ShadowRoot.\n// Must be patched as `_activeElement` on browsers without builtin accessors.\nexport let ActiveElementAccessor = {\n\n  activeElement: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return activeElementForNode(this);\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set() {},\n    configurable: true\n  }\n\n};\n\n// patch a group of descriptors on an object only if it exists or if the `force`\n// argument is true.\n/**\n * @param {!Object} obj\n * @param {!Object} descriptors\n * @param {boolean=} force\n */\nfunction patchAccessorGroup(obj, descriptors, force) {\n  for (let p in descriptors) {\n    let objDesc = Object.getOwnPropertyDescriptor(obj, p);\n    if ((objDesc && objDesc.configurable) ||\n      (!objDesc && force)) {\n      Object.defineProperty(obj, p, descriptors[p]);\n    } else if (force) {\n      console.warn('Could not define', p, 'on', obj);\n    }\n  }\n}\n\n// patch dom accessors on proto where they exist\nexport function patchAccessors(proto) {\n  patchAccessorGroup(proto, OutsideAccessors);\n  patchAccessorGroup(proto, InsideAccessors);\n  patchAccessorGroup(proto, ActiveElementAccessor);\n}\n\n// ensure element descriptors (IE/Edge don't have em)\nexport function patchShadowRootAccessors(proto) {\n  patchAccessorGroup(proto, InsideAccessors, true);\n  patchAccessorGroup(proto, ActiveElementAccessor, true);\n}\n\n// ensure an element has patched \"outside\" accessors; no-op when not needed\nexport let patchOutsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__outsideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__outsideAccessors = true;\n      patchAccessorGroup(element, OutsideAccessors, true);\n    }\n  }\n\n// ensure an element has patched \"inside\" accessors; no-op when not needed\nexport let patchInsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__insideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__insideAccessors = true;\n      patchAccessorGroup(element, InsideAccessors, true);\n      patchAccessorGroup(element, ShadowRootAccessor, true);\n    }\n  }\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-accessors.js';\nimport {firstChild, lastChild, childNodes} from './native-tree.js';\n\nexport function recordInsertBefore(node, container, ref_node) {\n  patchInsideElementAccessors(container);\n  container.__shady = container.__shady || {};\n  if (container.__shady.firstChild !== undefined) {\n    container.__shady.childNodes = null;\n  }\n  // handle document fragments\n  if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n    let c$ = node.childNodes;\n    for (let i=0; i < c$.length; i++) {\n      linkNode(c$[i], container, ref_node);\n    }\n    // cleanup logical dom in doc fragment.\n    node.__shady = node.__shady || {};\n    let resetTo = (node.__shady.firstChild !== undefined) ? null : undefined;\n    node.__shady.firstChild = node.__shady.lastChild = resetTo;\n    node.__shady.childNodes = resetTo;\n  } else {\n    linkNode(node, container, ref_node);\n  }\n}\n\nfunction linkNode(node, container, ref_node) {\n  patchOutsideElementAccessors(node);\n  ref_node = ref_node || null;\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (ref_node) {\n    ref_node.__shady = ref_node.__shady || {};\n  }\n  // update ref_node.previousSibling <-> node\n  node.__shady.previousSibling = ref_node ? ref_node.__shady.previousSibling :\n    container.lastChild;\n  let ps = node.__shady.previousSibling;\n  if (ps && ps.__shady) {\n    ps.__shady.nextSibling = node;\n  }\n  // update node <-> ref_node\n  let ns = node.__shady.nextSibling = ref_node;\n  if (ns && ns.__shady) {\n    ns.__shady.previousSibling = node;\n  }\n  // update node <-> container\n  node.__shady.parentNode = container;\n  if (ref_node) {\n    if (ref_node === container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  } else {\n    container.__shady.lastChild = node;\n    if (!container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  }\n  // remove caching of childNodes\n  container.__shady.childNodes = null;\n}\n\nexport function recordRemoveChild(node, container) {\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (node === container.__shady.firstChild) {\n    container.__shady.firstChild = node.__shady.nextSibling;\n  }\n  if (node === container.__shady.lastChild) {\n    container.__shady.lastChild = node.__shady.previousSibling;\n  }\n  let p = node.__shady.previousSibling;\n  let n = node.__shady.nextSibling;\n  if (p) {\n    p.__shady = p.__shady || {};\n    p.__shady.nextSibling = n;\n  }\n  if (n) {\n    n.__shady = n.__shady || {};\n    n.__shady.previousSibling = p;\n  }\n  // When an element is removed, logical data is no longer tracked.\n  // Explicitly set `undefined` here to indicate this. This is disginguished\n  // from `null` which is set if info is null.\n  node.__shady.parentNode = node.__shady.previousSibling =\n    node.__shady.nextSibling = undefined;\n  if (container.__shady.childNodes !== undefined) {\n    // remove caching of childNodes\n    container.__shady.childNodes = null;\n  }\n}\n\nexport let recordChildNodes = function(node) {\n  if (!node.__shady || node.__shady.firstChild === undefined) {\n    node.__shady = node.__shady || {};\n    node.__shady.firstChild = firstChild(node);\n    node.__shady.lastChild = lastChild(node);\n    patchInsideElementAccessors(node);\n    let c$ = node.__shady.childNodes = childNodes(node);\n    for (let i=0, n; (i<c$.length) && (n=c$[i]); i++) {\n      n.__shady = n.__shady || {};\n      n.__shady.parentNode = node;\n      n.__shady.nextSibling = c$[i+1] || null;\n      n.__shady.previousSibling = c$[i-1] || null;\n      patchOutsideElementAccessors(n);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as logicalTree from './logical-tree.js';\nimport * as nativeMethods from './native-methods.js';\nimport {parentNode} from './native-tree.js';\n\n// Patched `insertBefore`. Note that all mutations that add nodes are routed\n// here. When a <slot> is added or a node is added to a host with a shadowRoot\n// with a slot, a standard dom `insert` call is aborted and `_asyncRender`\n// is called on the relevant shadowRoot. In all other cases, a standard dom\n// `insert` can be made, but the location and ref_node may need to be changed.\n/**\n * @param {Node} parent\n * @param {Node} node\n * @param {Node=} ref_node\n */\nexport function insertBefore(parent, node, ref_node) {\n  if (node === parent) {\n    throw Error(`Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`);\n  }\n  if (ref_node) {\n    let p = ref_node.__shady && ref_node.__shady.parentNode;\n    if ((p !== undefined && p !== parent) ||\n      (p === undefined && parentNode(ref_node) !== parent)) {\n      throw Error(`Failed to execute 'insertBefore' on 'Node': The node ` +\n       `before which the new node is to be inserted is not a child of this node.`);\n    }\n  }\n  if (ref_node === node) {\n    return node;\n  }\n  // remove from existing location\n  if (node.parentNode) {\n    // NOTE: avoid node.removeChild as this *can* trigger another patched\n    // method (e.g. custom elements) and we want only the shady method to run.\n    removeChild(node.parentNode, node);\n  }\n  // add to new parent\n  let preventNativeInsert;\n  let ownerRoot = utils.ownerShadyRootForNode(parent);\n  // if a slot is added, must render containing root.\n  let slotsAdded = ownerRoot && findContainedSlots(node);\n  if (ownerRoot && (parent.localName === 'slot' || slotsAdded)) {\n    ownerRoot._asyncRender();\n  }\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordInsertBefore(node, parent, ref_node);\n    // when inserting into a host with a shadowRoot with slot, use\n    // `shadowRoot._asyncRender()` via `attach-shadow` module\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeInsert = true;\n    // when inserting into a host with shadowRoot with NO slot, do nothing\n    // as the node should not be added to composed dome anywhere.\n    } else if (parent.__shady.root) {\n      preventNativeInsert = true;\n    }\n  }\n  if (!preventNativeInsert) {\n    // if adding to a shadyRoot, add to host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host : parent;\n    // if ref_node, get the ref_node that's actually in composed dom.\n    if (ref_node) {\n      ref_node = firstComposedNode(ref_node);\n      nativeMethods.insertBefore.call(container, node, ref_node);\n    } else {\n      nativeMethods.appendChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, node);\n  // with insertion complete, can safely update insertion points.\n  if (slotsAdded) {\n    ownerRoot._addSlots(slotsAdded);\n  }\n  return node;\n}\n\nfunction findContainedSlots(node) {\n  if (!node['__noInsertionPoint']) {\n    let slots;\n    if (node.localName === 'slot') {\n      slots = [node];\n    } else if (node.querySelectorAll) {\n      slots = node.querySelectorAll('slot');\n    }\n    if (slots && slots.length) {\n      return slots;\n    }\n  }\n}\n\n/**\n * Patched `removeChild`. Note that all dom \"removals\" are routed here.\n * Removes the given `node` from the element's `children`.\n * This method also performs dom composition.\n * @param {Node} parent\n * @param {Node} node\n*/\nexport function removeChild(parent, node) {\n  if (node.parentNode !== parent) {\n    throw Error('The node to be removed is not a child of this node: ' +\n      node);\n  }\n  let preventNativeRemove;\n  let ownerRoot = utils.ownerShadyRootForNode(node);\n  let removingInsertionPoint;\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordRemoveChild(node, parent);\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeRemove = true;\n    }\n  }\n  removeOwnerShadyRoot(node);\n  // if removing slot, must render containing root\n  if (ownerRoot) {\n    let changeSlotContent = parent && parent.localName === 'slot';\n    if (changeSlotContent) {\n      preventNativeRemove = true;\n    }\n    removingInsertionPoint = ownerRoot._removeContainedSlots(node);\n    if (removingInsertionPoint || changeSlotContent) {\n      ownerRoot._asyncRender();\n    }\n  }\n  if (!preventNativeRemove) {\n    // if removing from a shadyRoot, remove form host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host :\n      parent;\n    // not guaranteed to physically be in container; e.g.\n    // (1) if parent has a shadyRoot, element may or may not at distributed\n    // location (could be undistributed)\n    // (2) if parent is a slot, element may not ben in composed dom\n    if (!(parent.__shady.root || node.localName === 'slot') ||\n      (container === parentNode(node))) {\n      nativeMethods.removeChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, null, node);\n  return node;\n}\n\nfunction removeOwnerShadyRoot(node) {\n  // optimization: only reset the tree if node is actually in a root\n  if (hasCachedOwnerRoot(node)) {\n    let c$ = node.childNodes;\n    for (let i=0, l=c$.length, n; (i<l) && (n=c$[i]); i++) {\n      removeOwnerShadyRoot(n);\n    }\n  }\n  if (node.__shady) {\n    node.__shady.ownerShadyRoot = undefined;\n  }\n}\n\nfunction hasCachedOwnerRoot(node) {\n  return Boolean(node.__shady && node.__shady.ownerShadyRoot !== undefined);\n}\n\n/**\n * Finds the first flattened node that is composed in the node's parent.\n * If the given node is a slot, then the first flattened node is returned\n * if it exists, otherwise advance to the node's nextSibling.\n * @param {Node} node within which to find first composed node\n * @returns {Node} first composed node\n */\nfunction firstComposedNode(node) {\n  let composed = node;\n  if (node && node.localName === 'slot') {\n    let flattened = node.__shady && node.__shady.flattenedNodes;\n    composed = flattened && flattened.length ? flattened[0] :\n      firstComposedNode(node.nextSibling);\n  }\n  return composed;\n}\n\nfunction hasShadowRootWithSlot(node) {\n  let root = node && node.__shady && node.__shady.root;\n  return (root && root._hasInsertionPoint());\n}\n\n/**\n * Should be called whenever an attribute changes. If the `slot` attribute\n * changes, provokes rendering if necessary. If a `<slot>` element's `name`\n * attribute changes, updates the root's slot map and renders.\n * @param {Node} node\n * @param {string} name\n */\nfunction distributeAttributeChange(node, name) {\n  if (name === 'slot') {\n    const parent = node.parentNode;\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n    }\n  } else if (node.localName === 'slot' && name === 'name') {\n    let root = utils.ownerShadyRootForNode(node);\n    if (root) {\n      root._updateSlotName(node);\n      root._asyncRender();\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Node=} addedNode\n * @param {Node=} removedNode\n */\nfunction scheduleObserver(node, addedNode, removedNode) {\n  let observer = node.__shady && node.__shady.observer;\n  if (observer) {\n    if (addedNode) {\n      observer.addedNodes.push(addedNode);\n    }\n    if (removedNode) {\n      observer.removedNodes.push(removedNode);\n    }\n    observer.schedule();\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Object=} options\n */\nexport function getRootNode(node, options) { // eslint-disable-line no-unused-vars\n  if (!node || !node.nodeType) {\n    return;\n  }\n  node.__shady = node.__shady || {};\n  let root = node.__shady.ownerShadyRoot;\n  if (root === undefined) {\n    if (utils.isShadyRoot(node)) {\n      root = node;\n    } else {\n      let parent = node.parentNode;\n      root = parent ? getRootNode(parent) : node;\n    }\n    // memo-ize result for performance but only memo-ize\n    // result if node is in the document. This avoids a problem where a root\n    // can be cached while an element is inside a fragment.\n    // If this happens and we cache the result, the value can become stale\n    // because for perf we avoid processing the subtree of added fragments.\n    if (document.documentElement.contains(node)) {\n      node.__shady.ownerShadyRoot = root;\n    }\n  }\n  return root;\n}\n\n// NOTE: `query` is used primarily for ShadyDOM's querySelector impl,\n// but it's also generally useful to recurse through the element tree\n// and is used by Polymer's styling system.\n/**\n * @param {Node} node\n * @param {Function} matcher\n * @param {Function=} halter\n */\nexport function query(node, matcher, halter) {\n  let list = [];\n  queryElements(node.childNodes, matcher,\n    halter, list);\n  return list;\n}\n\nfunction queryElements(elements, matcher, halter, list) {\n  for (let i=0, l=elements.length, c; (i<l) && (c=elements[i]); i++) {\n    if (c.nodeType === Node.ELEMENT_NODE &&\n        queryElement(c, matcher, halter, list)) {\n      return true;\n    }\n  }\n}\n\nfunction queryElement(node, matcher, halter, list) {\n  let result = matcher(node);\n  if (result) {\n    list.push(node);\n  }\n  if (halter && halter(result)) {\n    return result;\n  }\n  queryElements(node.childNodes, matcher,\n    halter, list);\n}\n\nexport function renderRootNode(element) {\n  var root = element.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    root._render();\n  }\n}\n\nlet scopingShim = null;\n\nexport function setAttribute(node, attr, value) {\n  if (!scopingShim) {\n    scopingShim = window['ShadyCSS'] && window['ShadyCSS']['ScopingShim'];\n  }\n  if (scopingShim && attr === 'class') {\n    scopingShim['setElementClass'](node, value);\n  } else {\n    nativeMethods.setAttribute.call(node, attr, value);\n    distributeAttributeChange(node, attr);\n  }\n}\n\nexport function removeAttribute(node, attr) {\n  nativeMethods.removeAttribute.call(node, attr);\n  distributeAttributeChange(node, attr);\n}\n\nexport function cloneNode(node, deep) {\n  if (node.localName == 'template') {\n    return nativeMethods.cloneNode.call(node, deep);\n  } else {\n    let n = nativeMethods.cloneNode.call(node, false);\n    if (deep) {\n      let c$ = node.childNodes;\n      for (let i=0, nc; i < c$.length; i++) {\n        nc = c$[i].cloneNode(true);\n        n.appendChild(nc);\n      }\n    }\n    return n;\n  }\n}\n\n// note: Though not technically correct, we fast path `importNode`\n// when called on a node not owned by the main document.\n// This allows, for example, elements that cannot\n// contain custom elements and are therefore not likely to contain shadowRoots\n// to cloned natively. This is a fairly significant performance win.\nexport function importNode(node, deep) {\n  if (node.ownerDocument !== document) {\n    return nativeMethods.importNode.call(document, node, deep);\n  }\n  let n = nativeMethods.importNode.call(document, node, false);\n  if (deep) {\n    let c$ = node.childNodes;\n    for (let i=0, nc; i < c$.length; i++) {\n      nc = importNode(c$[i], true);\n      n.appendChild(nc);\n    }\n  }\n  return n;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as nativeMethods from './native-methods.js';\n\n// https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937\nlet alwaysComposed = {\n  'blur': true,\n  'focus': true,\n  'focusin': true,\n  'focusout': true,\n  'click': true,\n  'dblclick': true,\n  'mousedown': true,\n  'mouseenter': true,\n  'mouseleave': true,\n  'mousemove': true,\n  'mouseout': true,\n  'mouseover': true,\n  'mouseup': true,\n  'wheel': true,\n  'beforeinput': true,\n  'input': true,\n  'keydown': true,\n  'keyup': true,\n  'compositionstart': true,\n  'compositionupdate': true,\n  'compositionend': true,\n  'touchstart': true,\n  'touchend': true,\n  'touchmove': true,\n  'touchcancel': true,\n  'pointerover': true,\n  'pointerenter': true,\n  'pointerdown': true,\n  'pointermove': true,\n  'pointerup': true,\n  'pointercancel': true,\n  'pointerout': true,\n  'pointerleave': true,\n  'gotpointercapture': true,\n  'lostpointercapture': true,\n  'dragstart': true,\n  'drag': true,\n  'dragenter': true,\n  'dragleave': true,\n  'dragover': true,\n  'drop': true,\n  'dragend': true,\n  'DOMActivate': true,\n  'DOMFocusIn': true,\n  'DOMFocusOut': true,\n  'keypress': true\n};\n\nfunction pathComposer(startNode, composed) {\n  let composedPath = [];\n  let current = startNode;\n  let startRoot = startNode === window ? window : startNode.getRootNode();\n  while (current) {\n    composedPath.push(current);\n    if (current.assignedSlot) {\n      current = current.assignedSlot;\n    } else if (current.nodeType === Node.DOCUMENT_FRAGMENT_NODE && current.host && (composed || current !== startRoot)) {\n      current = current.host;\n    } else {\n      current = current.parentNode;\n    }\n  }\n  // event composedPath includes window when startNode's ownerRoot is document\n  if (composedPath[composedPath.length - 1] === document) {\n    composedPath.push(window);\n  }\n  return composedPath;\n}\n\nfunction retarget(refNode, path) {\n  if (!utils.isShadyRoot) {\n    return refNode;\n  }\n  // If ANCESTOR's root is not a shadow root or ANCESTOR's root is BASE's\n  // shadow-including inclusive ancestor, return ANCESTOR.\n  let refNodePath = pathComposer(refNode, true);\n  let p$ = path;\n  for (let i=0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {\n    ancestor = p$[i];\n    root = ancestor === window ? window : ancestor.getRootNode();\n    if (root !== lastRoot) {\n      rootIdx = refNodePath.indexOf(root);\n      lastRoot = root;\n    }\n    if (!utils.isShadyRoot(root) || rootIdx > -1) {\n      return ancestor;\n    }\n  }\n}\n\nlet eventMixin = {\n\n  /**\n   * @this {Event}\n   */\n  get composed() {\n    // isTrusted may not exist in this browser, so just check if isTrusted is explicitly false\n    if (this.isTrusted !== false && this.__composed === undefined) {\n      this.__composed = alwaysComposed[this.type];\n    }\n    return this.__composed || false;\n  },\n\n  /**\n   * @this {Event}\n   */\n  composedPath() {\n    if (!this.__composedPath) {\n      this.__composedPath = pathComposer(this['__target'], this.composed);\n    }\n    return this.__composedPath;\n  },\n\n  /**\n   * @this {Event}\n   */\n  get target() {\n    return retarget(this.currentTarget, this.composedPath());\n  },\n\n  // http://w3c.github.io/webcomponents/spec/shadow/#event-relatedtarget-retargeting\n  /**\n   * @this {Event}\n   */\n  get relatedTarget() {\n    if (!this.__relatedTarget) {\n      return null;\n    }\n    if (!this.__relatedTargetComposedPath) {\n      this.__relatedTargetComposedPath = pathComposer(this.__relatedTarget, true);\n    }\n    // find the deepest node in relatedTarget composed path that is in the same root with the currentTarget\n    return retarget(this.currentTarget, this.__relatedTargetComposedPath);\n  },\n  /**\n   * @this {Event}\n   */\n  stopPropagation() {\n    Event.prototype.stopPropagation.call(this);\n    this.__propagationStopped = true;\n  },\n  /**\n   * @this {Event}\n   */\n  stopImmediatePropagation() {\n    Event.prototype.stopImmediatePropagation.call(this);\n    this.__immediatePropagationStopped = true;\n    this.__propagationStopped = true;\n  }\n\n};\n\nfunction mixinComposedFlag(Base) {\n  // NOTE: avoiding use of `class` here so that transpiled output does not\n  // try to do `Base.call` with a dom construtor.\n  let klazz = function(type, options) {\n    let event = new Base(type, options);\n    event.__composed = options && Boolean(options['composed']);\n    return event;\n  }\n  // put constructor properties on subclass\n  utils.mixin(klazz, Base);\n  klazz.prototype = Base.prototype;\n  return klazz;\n}\n\nlet nonBubblingEventsToRetarget = {\n  'focus': true,\n  'blur': true\n};\n\n\nfunction fireHandlers(event, node, phase) {\n  let hs = node.__handlers && node.__handlers[event.type] &&\n    node.__handlers[event.type][phase];\n  if (hs) {\n    for (let i = 0, fn; (fn = hs[i]); i++) {\n      if (event.target === event.relatedTarget) {\n        return;\n      }\n      fn.call(node, event);\n      if (event.__immediatePropagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction retargetNonBubblingEvent(e) {\n  let path = e.composedPath();\n  let node;\n  // override `currentTarget` to let patched `target` calculate correctly\n  Object.defineProperty(e, 'currentTarget', {\n    get: function() {\n      return node;\n    },\n    configurable: true\n  });\n  for (let i = path.length - 1; i >= 0; i--) {\n    node = path[i];\n    // capture phase fires all capture handlers\n    fireHandlers(e, node, 'capture');\n    if (e.__propagationStopped) {\n      return;\n    }\n  }\n\n  // set the event phase to `AT_TARGET` as in spec\n  Object.defineProperty(e, 'eventPhase', {get() { return Event.AT_TARGET }});\n\n  // the event only needs to be fired when owner roots change when iterating the event path\n  // keep track of the last seen owner root\n  let lastFiredRoot;\n  for (let i = 0; i < path.length; i++) {\n    node = path[i];\n    const root = node.__shady && node.__shady.root;\n    if (i === 0 || (root && root === lastFiredRoot)) {\n      fireHandlers(e, node, 'bubble');\n      // don't bother with window, it doesn't have `getRootNode` and will be last in the path anyway\n      if (node !== window) {\n        lastFiredRoot = node.getRootNode();\n      }\n      if (e.__propagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction listenerSettingsEqual(savedListener, node, type, capture, once, passive) {\n  let {\n    node: savedNode,\n    type: savedType,\n    capture: savedCapture,\n    once: savedOnce,\n    passive: savedPassive\n  } = savedListener;\n  return node === savedNode &&\n    type === savedType &&\n    capture === savedCapture &&\n    once === savedOnce &&\n    passive === savedPassive;\n}\n\nexport function findListener(wrappers, node, type, capture, once, passive) {\n  for (let i = 0; i < wrappers.length; i++) {\n    if (listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)) {\n      return i;\n    }\n  }\n  return -1;\n}\n\n/**\n * Firefox can throw on accessing __eventWrappers inside of `removeEventListener` during a selenium run\n * Try/Catch accessing __eventWrappers to work around\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1353074\n */\nfunction getEventWrappers(eventLike) {\n  let wrappers = null;\n  try {\n    wrappers = eventLike.__eventWrappers;\n  } catch (e) {} // eslint-disable-line no-empty\n  return wrappers;\n}\n\n/**\n * @this {Event}\n */\nexport function addEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // The callback `fn` might be used for multiple nodes/events. Since we generate\n  // a wrapper function, we need to keep track of it when we remove the listener.\n  // It's more efficient to store the node/type/options information as Array in\n  // `fn` itself rather than the node (we assume that the same callback is used\n  // for few nodes at most, whereas a node will likely have many event listeners).\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  // hack to let ShadyRoots have event listeners\n  // event listener will be on host, but `currentTarget`\n  // will be set to shadyroot for event listener\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n\n  let wrappers = fnOrObj.__eventWrappers;\n  if (wrappers) {\n    // Stop if the wrapper function has already been created.\n    if (findListener(wrappers, target, type, capture, once, passive) > -1) {\n      return;\n    }\n  } else {\n    fnOrObj.__eventWrappers = [];\n  }\n\n  /**\n   * @this {HTMLElement}\n   */\n  const wrapperFn = function(e) {\n    // Support `once` option.\n    if (once) {\n      this.removeEventListener(type, fnOrObj, optionsOrCapture);\n    }\n    if (!e['__target']) {\n      patchEvent(e);\n    }\n    let lastCurrentTargetDesc;\n    if (target !== this) {\n      // replace `currentTarget` to make `target` and `relatedTarget` correct for inside the shadowroot\n      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(e, 'currentTarget');\n      Object.defineProperty(e, 'currentTarget', {get() { return target }, configurable: true});\n    }\n    // There are two critera that should stop events from firing on this node\n    // 1. the event is not composed and the current node is not in the same root as the target\n    // 2. when bubbling, if after retargeting, relatedTarget and target point to the same node\n    if (e.composed || e.composedPath().indexOf(target) > -1) {\n      if (e.target === e.relatedTarget) {\n        if (e.eventPhase === Event.BUBBLING_PHASE) {\n          e.stopImmediatePropagation();\n        }\n        return;\n      }\n      // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase\n      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target) {\n        return;\n      }\n      let ret = (typeof fnOrObj === 'object' && fnOrObj.handleEvent) ?\n        fnOrObj.handleEvent(e) :\n        fnOrObj.call(target, e);\n      if (target !== this) {\n        // replace the \"correct\" `currentTarget`\n        if (lastCurrentTargetDesc) {\n          Object.defineProperty(e, 'currentTarget', lastCurrentTargetDesc);\n          lastCurrentTargetDesc = null;\n        } else {\n          delete e['currentTarget'];\n        }\n      }\n      return ret;\n    }\n  };\n  // Store the wrapper information.\n  fnOrObj.__eventWrappers.push({\n    node: this,\n    type: type,\n    capture: capture,\n    once: once,\n    passive: passive,\n    wrapperFn: wrapperFn\n  });\n\n  if (nonBubblingEventsToRetarget[type]) {\n    this.__handlers = this.__handlers || {};\n    this.__handlers[type] = this.__handlers[type] ||\n      {'capture': [], 'bubble': []};\n    this.__handlers[type][capture ? 'capture' : 'bubble'].push(wrapperFn);\n  } else {\n    let ael = this instanceof Window ? nativeMethods.windowAddEventListener :\n      nativeMethods.addEventListener;\n    ael.call(this, type, wrapperFn, optionsOrCapture);\n  }\n}\n\n/**\n * @this {Event}\n */\nexport function removeEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n  // Search the wrapped function.\n  let wrapperFn = undefined;\n  let wrappers = getEventWrappers(fnOrObj);\n  if (wrappers) {\n    let idx = findListener(wrappers, target, type, capture, once, passive);\n    if (idx > -1) {\n      wrapperFn = wrappers.splice(idx, 1)[0].wrapperFn;\n      // Cleanup.\n      if (!wrappers.length) {\n        fnOrObj.__eventWrappers = undefined;\n      }\n    }\n  }\n  let rel = this instanceof Window ? nativeMethods.windowRemoveEventListener :\n    nativeMethods.removeEventListener;\n  rel.call(this, type, wrapperFn || fnOrObj, optionsOrCapture);\n  if (wrapperFn && nonBubblingEventsToRetarget[type] &&\n      this.__handlers && this.__handlers[type]) {\n    const arr = this.__handlers[type][capture ? 'capture' : 'bubble'];\n    const idx = arr.indexOf(wrapperFn);\n    if (idx > -1) {\n      arr.splice(idx, 1);\n    }\n  }\n}\n\nfunction activateFocusEventOverrides() {\n  for (let ev in nonBubblingEventsToRetarget) {\n    window.addEventListener(ev, function(e) {\n      if (!e['__target']) {\n        patchEvent(e);\n        retargetNonBubblingEvent(e);\n      }\n    }, true);\n  }\n}\n\nfunction patchEvent(event) {\n  event['__target'] = event.target;\n  event.__relatedTarget = event.relatedTarget;\n  // patch event prototype if we can\n  if (utils.settings.hasDescriptors) {\n    utils.patchPrototype(event, eventMixin);\n  // and fallback to patching instance\n  } else {\n    utils.extend(event, eventMixin);\n  }\n}\n\nlet PatchedEvent = mixinComposedFlag(window.Event);\nlet PatchedCustomEvent = mixinComposedFlag(window.CustomEvent);\nlet PatchedMouseEvent = mixinComposedFlag(window.MouseEvent);\n\nexport function patchEvents() {\n  window.Event = PatchedEvent;\n  window.CustomEvent = PatchedCustomEvent;\n  window.MouseEvent = PatchedMouseEvent;\n  activateFocusEventOverrides();\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nfunction newSplice(index, removed, addedCount) {\n  return {\n    index: index,\n    removed: removed,\n    addedCount: addedCount\n  };\n}\n\nconst EDIT_LEAVE = 0;\nconst EDIT_UPDATE = 1;\nconst EDIT_ADD = 2;\nconst EDIT_DELETE = 3;\n\n// Note: This function is *based* on the computation of the Levenshtein\n// \"edit\" distance. The one change is that \"updates\" are treated as two\n// edits - not one. With Array splices, an update is really a delete\n// followed by an add. By retaining this, we optimize for \"keeping\" the\n// maximum array items in the original array. For example:\n//\n//   'xxxx123' -> '123yyyy'\n//\n// With 1-edit updates, the shortest path would be just to update all seven\n// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This\n// leaves the substring '123' intact.\nfunction calcEditDistances(current, currentStart, currentEnd,\n                            old, oldStart, oldEnd) {\n  // \"Deletion\" columns\n  let rowCount = oldEnd - oldStart + 1;\n  let columnCount = currentEnd - currentStart + 1;\n  let distances = new Array(rowCount);\n\n  // \"Addition\" rows. Initialize null column.\n  for (let i = 0; i < rowCount; i++) {\n    distances[i] = new Array(columnCount);\n    distances[i][0] = i;\n  }\n\n  // Initialize null row\n  for (let j = 0; j < columnCount; j++)\n    distances[0][j] = j;\n\n  for (let i = 1; i < rowCount; i++) {\n    for (let j = 1; j < columnCount; j++) {\n      if (equals(current[currentStart + j - 1], old[oldStart + i - 1]))\n        distances[i][j] = distances[i - 1][j - 1];\n      else {\n        let north = distances[i - 1][j] + 1;\n        let west = distances[i][j - 1] + 1;\n        distances[i][j] = north < west ? north : west;\n      }\n    }\n  }\n\n  return distances;\n}\n\n// This starts at the final weight, and walks \"backward\" by finding\n// the minimum previous weight recursively until the origin of the weight\n// matrix.\nfunction spliceOperationsFromEditDistances(distances) {\n  let i = distances.length - 1;\n  let j = distances[0].length - 1;\n  let current = distances[i][j];\n  let edits = [];\n  while (i > 0 || j > 0) {\n    if (i == 0) {\n      edits.push(EDIT_ADD);\n      j--;\n      continue;\n    }\n    if (j == 0) {\n      edits.push(EDIT_DELETE);\n      i--;\n      continue;\n    }\n    let northWest = distances[i - 1][j - 1];\n    let west = distances[i - 1][j];\n    let north = distances[i][j - 1];\n\n    let min;\n    if (west < north)\n      min = west < northWest ? west : northWest;\n    else\n      min = north < northWest ? north : northWest;\n\n    if (min == northWest) {\n      if (northWest == current) {\n        edits.push(EDIT_LEAVE);\n      } else {\n        edits.push(EDIT_UPDATE);\n        current = northWest;\n      }\n      i--;\n      j--;\n    } else if (min == west) {\n      edits.push(EDIT_DELETE);\n      i--;\n      current = west;\n    } else {\n      edits.push(EDIT_ADD);\n      j--;\n      current = north;\n    }\n  }\n\n  edits.reverse();\n  return edits;\n}\n\n/**\n * Splice Projection functions:\n *\n * A splice map is a representation of how a previous array of items\n * was transformed into a new array of items. Conceptually it is a list of\n * tuples of\n *\n *   <index, removed, addedCount>\n *\n * which are kept in ascending index order of. The tuple represents that at\n * the |index|, |removed| sequence of items were removed, and counting forward\n * from |index|, |addedCount| items were added.\n */\n\n/**\n * Lacking individual splice mutation information, the minimal set of\n * splices can be synthesized given the previous state and final state of an\n * array. The basic approach is to calculate the edit distance matrix and\n * choose the shortest path through it.\n *\n * Complexity: O(l * p)\n *   l: The length of the current array\n *   p: The length of the old array\n */\nfunction calcSplices(current, currentStart, currentEnd,\n                      old, oldStart, oldEnd) {\n  let prefixCount = 0;\n  let suffixCount = 0;\n  let splice;\n\n  let minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);\n  if (currentStart == 0 && oldStart == 0)\n    prefixCount = sharedPrefix(current, old, minLength);\n\n  if (currentEnd == current.length && oldEnd == old.length)\n    suffixCount = sharedSuffix(current, old, minLength - prefixCount);\n\n  currentStart += prefixCount;\n  oldStart += prefixCount;\n  currentEnd -= suffixCount;\n  oldEnd -= suffixCount;\n\n  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)\n    return [];\n\n  if (currentStart == currentEnd) {\n    splice = newSplice(currentStart, [], 0);\n    while (oldStart < oldEnd)\n      splice.removed.push(old[oldStart++]);\n\n    return [ splice ];\n  } else if (oldStart == oldEnd)\n    return [ newSplice(currentStart, [], currentEnd - currentStart) ];\n\n  let ops = spliceOperationsFromEditDistances(\n      calcEditDistances(current, currentStart, currentEnd,\n                             old, oldStart, oldEnd));\n\n  splice = undefined;\n  let splices = [];\n  let index = currentStart;\n  let oldIndex = oldStart;\n  for (let i = 0; i < ops.length; i++) {\n    switch(ops[i]) {\n      case EDIT_LEAVE:\n        if (splice) {\n          splices.push(splice);\n          splice = undefined;\n        }\n\n        index++;\n        oldIndex++;\n        break;\n      case EDIT_UPDATE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n      case EDIT_ADD:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n        break;\n      case EDIT_DELETE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n    }\n  }\n\n  if (splice) {\n    splices.push(splice);\n  }\n  return splices;\n}\n\nfunction sharedPrefix(current, old, searchLength) {\n  for (let i = 0; i < searchLength; i++)\n    if (!equals(current[i], old[i]))\n      return i;\n  return searchLength;\n}\n\nfunction sharedSuffix(current, old, searchLength) {\n  let index1 = current.length;\n  let index2 = old.length;\n  let count = 0;\n  while (count < searchLength && equals(current[--index1], old[--index2]))\n    count++;\n\n  return count;\n}\n\nfunction equals(currentValue, previousValue) {\n  return currentValue === previousValue;\n}\n\nexport function calculateSplices(current, previous) {\n  return calcSplices(current, 0, current.length, previous, 0,\n                          previous.length);\n}\n\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as mutation from './logical-mutation.js';\nimport {calculateSplices} from './array-splice.js';\nimport * as utils from './utils.js';\nimport {enqueue} from './flush.js';\nimport {recordChildNodes} from './logical-tree.js';\nimport {removeChild, insertBefore, dispatchEvent} from './native-methods.js';\nimport {parentNode, childNodes} from './native-tree.js';\nimport {patchShadowRootAccessors} from './patch-accessors.js';\n\n// Do not export this object. It must be passed as the first argument to the\n// ShadyRoot constructor in `attachShadow` to prevent the constructor from\n// throwing. This prevents the user from being able to manually construct a\n// ShadyRoot (i.e. `new ShadowRoot()`).\nconst ShadyRootConstructionToken = {};\n\nconst CATCHALL_NAME = '__catchall';\n\n/**\n * @constructor\n * @extends {ShadowRoot}\n */\nexport let ShadyRoot = function(token, host, options) {\n  if (token !== ShadyRootConstructionToken) {\n    throw new TypeError('Illegal constructor');\n  }\n  // NOTE: this strange construction is necessary because\n  // DocumentFragment cannot be subclassed on older browsers.\n  let shadowRoot = document.createDocumentFragment();\n  shadowRoot.__proto__ = ShadyRoot.prototype;\n  /** @type {ShadyRoot} */ (shadowRoot)._init(host, options);\n  return shadowRoot;\n};\n\nShadyRoot.prototype = Object.create(DocumentFragment.prototype);\n\nShadyRoot.prototype._init = function(host, options) {\n  // NOTE: set a fake local name so this element can be\n  // distinguished from a DocumentFragment when patching.\n  // FF doesn't allow this to be `localName`\n  this.__localName = 'ShadyRoot';\n  // logical dom setup\n  recordChildNodes(host);\n  recordChildNodes(this);\n  // root <=> host\n  this.host = host;\n  this._mode = options && options.mode;\n  host.__shady = host.__shady || {};\n  host.__shady.root = this;\n  host.__shady.publicRoot = this._mode !== 'closed' ? this : null;\n  // state flags\n  this._renderPending = false;\n  this._hasRendered = false;\n  this._slotList = [];\n  this._slotMap = null;\n  // fast path initial render: remove existing physical dom.\n  let c$ = childNodes(host);\n  for (let i=0, l=c$.length; i < l; i++) {\n    removeChild.call(host, c$[i])\n  }\n}\n\n// async render\nShadyRoot.prototype._asyncRender = function() {\n  if (!this._renderPending) {\n    this._renderPending = true;\n    enqueue(() => this._render());\n  }\n}\n\n// returns the oldest renderPending ancestor root.\nShadyRoot.prototype._getRenderRoot = function() {\n  let renderRoot = this;\n  let root = this;\n  while (root) {\n    if (root._renderPending) {\n      renderRoot = root;\n    }\n    root = root._rendererForHost();\n  }\n  return renderRoot;\n}\n\n// Returns the shadyRoot `this.host` if `this.host`\n// has children that require distribution.\nShadyRoot.prototype._rendererForHost = function() {\n  let root = this.host.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    let c$ = this.host.childNodes;\n    for (let i=0, c; i < c$.length; i++) {\n      c = c$[i];\n      if (this._isInsertionPoint(c)) {\n        return root;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._render = function() {\n  if (this._renderPending) {\n    this._getRenderRoot()['_renderRoot']();\n  }\n}\n\n// NOTE: avoid renaming to ease testability.\nShadyRoot.prototype['_renderRoot'] = function() {\n  this._renderPending = false;\n  this._distribute();\n  this._compose();\n  this._hasRendered = true;\n}\n\nShadyRoot.prototype._distribute = function() {\n  // capture # of previously assigned nodes to help determine if dirty.\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    this._clearSlotAssignedNodes(slot);\n  }\n  // distribute host children.\n  for (let n=this.host.firstChild; n; n=n.nextSibling) {\n    this._distributeNodeToSlot(n);\n  }\n  // fallback content, slotchange, and dirty roots\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    // distribute fallback content\n    if (!slot.__shady.assignedNodes.length) {\n      for (let n=slot.firstChild; n; n=n.nextSibling) {\n        this._distributeNodeToSlot(n, slot);\n      }\n    }\n    const slotParent = slot.parentNode;\n    const slotParentRoot = slotParent.__shady && slotParent.__shady.root;\n    if (slotParentRoot && slotParentRoot._hasInsertionPoint()) {\n      slotParentRoot['_renderRoot']();\n    }\n    this._addAssignedToFlattenedNodes(slot.__shady.flattenedNodes,\n      slot.__shady.assignedNodes);\n    let prevAssignedNodes = slot.__shady._previouslyAssignedNodes;\n    if (prevAssignedNodes) {\n      for (let i=0; i < prevAssignedNodes.length; i++) {\n        prevAssignedNodes[i].__shady._prevAssignedSlot = null;\n      }\n      slot.__shady._previouslyAssignedNodes = null;\n      // dirty if previously less assigned nodes than previously assigned.\n      if (prevAssignedNodes.length > slot.__shady.assignedNodes.length) {\n        slot.__shady.dirty = true;\n      }\n    }\n    /* Note: A slot is marked dirty whenever a node is newly assigned to it\n    or a node is assigned to a different slot (done in `_distributeNodeToSlot`)\n    or if the number of nodes assigned to the slot has decreased (done above);\n     */\n    if (slot.__shady.dirty) {\n      slot.__shady.dirty = false;\n      this._fireSlotChange(slot);\n    }\n  }\n}\n\n/**\n * Distributes given `node` to the appropriate slot based on its `slot`\n * attribute. If `forcedSlot` is given, then the node is distributed to the\n * `forcedSlot`.\n * Note: slot to which the node is assigned will be marked dirty for firing\n * `slotchange`.\n * @param {Node} node\n * @param {Node=} forcedSlot\n *\n */\nShadyRoot.prototype._distributeNodeToSlot = function(node, forcedSlot) {\n  node.__shady = node.__shady || {};\n  let oldSlot = node.__shady._prevAssignedSlot;\n  node.__shady._prevAssignedSlot = null;\n  let slot = forcedSlot;\n  if (!slot) {\n    let name = node.slot || CATCHALL_NAME;\n    const list = this._slotMap[name];\n    slot = list && list[0];\n  }\n  if (slot) {\n    slot.__shady.assignedNodes.push(node);\n    node.__shady.assignedSlot = slot;\n  } else {\n    node.__shady.assignedSlot = undefined;\n  }\n  if (oldSlot !== node.__shady.assignedSlot) {\n    if (node.__shady.assignedSlot) {\n      node.__shady.assignedSlot.__shady.dirty = true;\n    }\n  }\n}\n\n/**\n * Clears the assignedNodes tracking data for a given `slot`. Note, the current\n * assigned node data is tracked (via _previouslyAssignedNodes and\n * _prevAssignedSlot) to see if `slotchange` should fire. This data may be out\n *  of date at this time because the assigned nodes may have already been\n * distributed to another root. This is ok since this data is only used to\n * track changes.\n * @param {HTMLSlotElement} slot\n */\nShadyRoot.prototype._clearSlotAssignedNodes = function(slot) {\n  let n$ = slot.__shady.assignedNodes;\n  slot.__shady.assignedNodes = [];\n  slot.__shady.flattenedNodes = [];\n  slot.__shady._previouslyAssignedNodes = n$;\n  if (n$) {\n    for (let i=0; i < n$.length; i++) {\n      let n = n$[i];\n      n.__shady._prevAssignedSlot = n.__shady.assignedSlot;\n      // only clear if it was previously set to this slot;\n      // this helps ensure that if the node has otherwise been distributed\n      // ignore it.\n      if (n.__shady.assignedSlot === slot) {\n        n.__shady.assignedSlot = null;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._addAssignedToFlattenedNodes = function(flattened, asssigned) {\n  for (let i=0, n; (i<asssigned.length) && (n=asssigned[i]); i++) {\n    if (n.localName == 'slot') {\n      this._addAssignedToFlattenedNodes(flattened, n.__shady.assignedNodes);\n    } else {\n      flattened.push(asssigned[i]);\n    }\n  }\n}\n\nShadyRoot.prototype._fireSlotChange = function(slot) {\n  // NOTE: cannot bubble correctly here so not setting bubbles: true\n  // Safari tech preview does not bubble but chrome does\n  // Spec says it bubbles (https://dom.spec.whatwg.org/#mutation-observers)\n  dispatchEvent.call(slot, new Event('slotchange'));\n  if (slot.__shady.assignedSlot) {\n    this._fireSlotChange(slot.__shady.assignedSlot);\n  }\n}\n\n// Reify dom such that it is at its correct rendering position\n// based on logical distribution.\n// NOTE: here we only compose parents of <slot> elements and not the\n// shadowRoot into the host. The latter is performend via a fast path\n// in the `logical-mutation`.insertBefore.\nShadyRoot.prototype._compose = function() {\n  const slots = this._slotList;\n  let composeList = [];\n  for (let i=0; i < slots.length; i++) {\n    const parent = slots[i].parentNode;\n    /* compose node only if:\n      (1) parent does not have a shadowRoot since shadowRoot has already\n      composed into the host\n      (2) we're not already composing it\n      [consider (n^2) but rare better than Set]\n    */\n    if (!(parent.__shady && parent.__shady.root) &&\n      composeList.indexOf(parent) < 0) {\n      composeList.push(parent);\n    }\n  }\n  for (let i=0; i < composeList.length; i++) {\n    const node = composeList[i];\n    const targetNode = node === this ? this.host : node;\n    this._updateChildNodes(targetNode, this._composeNode(node));\n  }\n}\n\n// Returns the list of nodes which should be rendered inside `node`.\nShadyRoot.prototype._composeNode = function(node) {\n  let children = [];\n  let c$ = node.childNodes;\n  for (let i = 0; i < c$.length; i++) {\n    let child = c$[i];\n    // Note: if we see a slot here, the nodes are guaranteed to need to be\n    // composed here. This is because if there is redistribution, it has\n    // already been handled by this point.\n    if (this._isInsertionPoint(child)) {\n      let flattenedNodes = child.__shady.flattenedNodes;\n      for (let j = 0; j < flattenedNodes.length; j++) {\n        let distributedNode = flattenedNodes[j];\n          children.push(distributedNode);\n      }\n    } else {\n      children.push(child);\n    }\n  }\n  return children;\n}\n\nShadyRoot.prototype._isInsertionPoint = function(node) {\n    return node.localName == 'slot';\n  }\n\n// Ensures that the rendered node list inside `container` is `children`.\nShadyRoot.prototype._updateChildNodes = function(container, children) {\n  let composed = childNodes(container);\n  let splices = calculateSplices(children, composed);\n  // process removals\n  for (let i=0, d=0, s; (i<splices.length) && (s=splices[i]); i++) {\n    for (let j=0, n; (j < s.removed.length) && (n=s.removed[j]); j++) {\n      // check if the node is still where we expect it is before trying\n      // to remove it; this can happen if we move a node and\n      // then schedule its previous host for distribution resulting in\n      // the node being removed here.\n      if (parentNode(n) === container) {\n        removeChild.call(container, n);\n      }\n      composed.splice(s.index + d, 1);\n    }\n    d -= s.addedCount;\n  }\n  // process adds\n  for (let i=0, s, next; (i<splices.length) && (s=splices[i]); i++) { //eslint-disable-line no-redeclare\n    next = composed[s.index];\n    for (let j=s.index, n; j < s.index + s.addedCount; j++) {\n      n = children[j];\n      insertBefore.call(container, n, next);\n      composed.splice(j, 0, n);\n    }\n  }\n}\n\n/**\n * Adds the given slots. Slots are maintained in an dom-ordered list.\n * In addition a map of name to slot is updated.\n */\nShadyRoot.prototype._addSlots = function(slots) {\n  let slotNamesToSort;\n  this._slotMap = this._slotMap || {};\n  this._slotList = this._slotList || [];\n  for (let i=0; i < slots.length; i++) {\n    let slot = slots[i];\n    // ensure insertionPoints's and their parents have logical dom info.\n    // save logical tree info\n    // a. for shadyRoot\n    // b. for insertion points (fallback)\n    // c. for parents of insertion points\n    slot.__shady = slot.__shady || {};\n    recordChildNodes(slot);\n    recordChildNodes(slot.parentNode);\n    let name = this._nameForSlot(slot);\n    if (this._slotMap[name]) {\n      slotNamesToSort = slotNamesToSort || {};\n      slotNamesToSort[name] = true;\n      this._slotMap[name].push(slot);\n    } else {\n      this._slotMap[name] = [slot];\n    }\n    this._slotList.push(slot);\n  }\n  if (slotNamesToSort) {\n    for (let n in slotNamesToSort) {\n      this._slotMap[n] = this._sortSlots(this._slotMap[n]);\n    }\n  }\n}\n\nShadyRoot.prototype._nameForSlot = function(slot) {\n  const name = slot['name'] || slot.getAttribute('name') || CATCHALL_NAME;\n  slot.__slotName = name;\n  return name;\n}\n\n/**\n * Slots are kept in an ordered list. Slots with the same name\n * are sorted here by tree order.\n */\nShadyRoot.prototype._sortSlots = function(slots) {\n  // NOTE: Cannot use `compareDocumentPosition` because it's not polyfilled,\n  // but the code here could be used to polyfill the preceeding/following info\n  // in `compareDocumentPosition`.\n  return slots.sort((a, b) => {\n    let listA = ancestorList(a);\n    let listB = ancestorList(b);\n    for (var i=0; i < listA.length; i++) {\n      let nA = listA[i];\n      let nB = listB[i];\n      if (nA !== nB) {\n        let c$ = Array.from(nA.parentNode.childNodes);\n        return c$.indexOf(nA) - c$.indexOf(nB);\n      }\n    }\n  });\n}\n\nfunction ancestorList(node) {\n  let ancestors = [];\n  do {\n    ancestors.unshift(node);\n  } while ((node = node.parentNode));\n  return ancestors;\n}\n\n// NOTE: could be used to help polyfill `document.contains`.\nfunction contains(container, node) {\n  while (node) {\n    if (node == container) {\n      return true;\n    }\n    node = node.parentNode;\n  }\n}\n\n/**\n * Removes from tracked slot data any slots contained within `container` and\n * then updates the tracked data (_slotList and _slotMap).\n * Any removed slots also have their `assignedNodes` removed from comopsed dom.\n */\nShadyRoot.prototype._removeContainedSlots = function(container) {\n  let didRemove;\n  this._slotMap = this._slotMap || {};\n  this._slotList = this._slotList || [];\n  const map = this._slotMap;\n  for (let n in map) {\n    let slots = map[n];\n    for (let i=0; i < slots.length; i++) {\n      let slot = slots[i];\n      if (contains(container, slot)) {\n        slots.splice(i, 1);\n        const x = this._slotList.indexOf(slot);\n        if (x >= 0) {\n          this._slotList.splice(x, 1);\n        }\n        i--;\n        this._removeFlattenedNodes(slot);\n        didRemove = true;\n      }\n    }\n  }\n  return didRemove;\n}\n\nShadyRoot.prototype._updateSlotName = function(slot) {\n  const oldName = slot.__slotName;\n  const name = this._nameForSlot(slot);\n  if (name === oldName) {\n    return;\n  }\n  // remove from existing tracking\n  let slots = this._slotMap[oldName];\n  const i = slots.indexOf(slot);\n  if (i >= 0) {\n    slots.splice(i, 1);\n  }\n  // add to new location and sort if nedessary\n  let list = this._slotMap[name] || (this._slotMap[name] = []);\n  list.push(slot);\n  if (list.length > 1) {\n    this._slotMap[name] = this._sortSlots(list);\n  }\n}\n\nShadyRoot.prototype._removeFlattenedNodes = function(slot) {\n  let n$ = slot.__shady.flattenedNodes;\n  if (n$) {\n    for (let i=0; i<n$.length; i++) {\n      let node = n$[i];\n      let parent = parentNode(node);\n      if (parent) {\n        removeChild.call(parent, node);\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._hasInsertionPoint = function() {\n  return Boolean(this._slotList.length);\n}\n\nShadyRoot.prototype.addEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.addEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.removeEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.removeEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.getElementById = function(id) {\n  let result = mutation.query(this, function(n) {\n    return n.id == id;\n  }, function(n) {\n    return Boolean(n);\n  })[0];\n  return result || null;\n}\n\n/**\n  Implements a pared down version of ShadowDOM's scoping, which is easy to\n  polyfill across browsers.\n*/\nexport function attachShadow(host, options) {\n  if (!host) {\n    throw 'Must provide a host.';\n  }\n  if (!options) {\n    throw 'Not enough arguments.'\n  }\n  return new ShadyRoot(ShadyRootConstructionToken, host, options);\n}\n\npatchShadowRootAccessors(ShadyRoot.prototype);","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {flush} from './flush.js';\nimport {dispatchEvent} from './native-methods.js';\nimport * as mutation from './logical-mutation.js';\nimport {ActiveElementAccessor, ShadowRootAccessor, patchAccessors} from './patch-accessors.js';\nimport {addEventListener, removeEventListener} from './patch-events.js';\nimport {attachShadow, ShadyRoot} from './attach-shadow.js';\n\nfunction getAssignedSlot(node) {\n  mutation.renderRootNode(node);\n  return node.__shady && node.__shady.assignedSlot || null;\n}\n\nlet windowMixin = {\n\n  // NOTE: ensure these methods are bound to `window` so that `this` is correct\n  // when called directly from global context without a receiver; e.g.\n  // `addEventListener(...)`.\n  addEventListener: addEventListener.bind(window),\n\n  removeEventListener: removeEventListener.bind(window)\n\n};\n\nlet nodeMixin = {\n\n  addEventListener: addEventListener,\n\n  removeEventListener: removeEventListener,\n\n  appendChild(node) {\n    return mutation.insertBefore(this, node);\n  },\n\n  insertBefore(node, ref_node) {\n    return mutation.insertBefore(this, node, ref_node);\n  },\n\n  removeChild(node) {\n    return mutation.removeChild(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  replaceChild(node, ref_node) {\n    mutation.insertBefore(this, node, ref_node);\n    mutation.removeChild(this, ref_node);\n    return node;\n  },\n\n  /**\n   * @this {Node}\n   */\n  cloneNode(deep) {\n    return mutation.cloneNode(this, deep);\n  },\n\n  /**\n   * @this {Node}\n   */\n  getRootNode(options) {\n    return mutation.getRootNode(this, options);\n  },\n\n  /**\n   * @this {Node}\n   */\n  get isConnected() {\n    // Fast path for distributed nodes.\n    const ownerDocument = this.ownerDocument;\n    if (ownerDocument && ownerDocument.contains && ownerDocument.contains(this)) return true;\n    const ownerDocumentElement = ownerDocument.documentElement;\n    if (ownerDocumentElement && ownerDocumentElement.contains && ownerDocumentElement.contains(this)) return true;\n\n    let node = this;\n    while (node && !(node instanceof Document)) {\n      node = node.parentNode || (node instanceof ShadyRoot ? /** @type {ShadowRoot} */(node).host : undefined);\n    }\n    return !!(node && node instanceof Document);\n  },\n\n  /**\n   * @this {Node}\n   */\n  dispatchEvent(event) {\n    flush();\n    return dispatchEvent.call(this, event);\n  }\n\n};\n\n// NOTE: For some reason 'Text' redefines 'assignedSlot'\nlet textMixin = {\n  /**\n   * @this {Text}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n};\n\nlet fragmentMixin = {\n\n  // TODO(sorvell): consider doing native QSA and filtering results.\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelector(selector) {\n    // match selector and halt on first result.\n    let result = mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  },\n\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelectorAll(selector) {\n    return mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    });\n  }\n\n};\n\nlet slotMixin = {\n\n  /**\n   * @this {HTMLSlotElement}\n   */\n  assignedNodes(options) {\n    if (this.localName === 'slot') {\n      mutation.renderRootNode(this);\n      return this.__shady ?\n        ((options && options.flatten ? this.__shady.flattenedNodes :\n        this.__shady.assignedNodes) || []) :\n        [];\n    }\n  }\n\n};\n\nlet elementMixin = utils.extendAll({\n\n  /**\n   * @this {HTMLElement}\n   */\n  setAttribute(name, value) {\n    mutation.setAttribute(this, name, value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  removeAttribute(name) {\n    mutation.removeAttribute(this, name);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  attachShadow(options) {\n    return attachShadow(this, options);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get slot() {\n    return this.getAttribute('slot');\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  set slot(value) {\n    mutation.setAttribute(this, 'slot', value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n\n}, fragmentMixin, slotMixin);\n\nObject.defineProperties(elementMixin, ShadowRootAccessor);\n\nlet documentMixin = utils.extendAll({\n  /**\n   * @this {Document}\n   */\n  importNode(node, deep) {\n    return mutation.importNode(node, deep);\n  },\n\n  /**\n   * @this {Document}\n   */\n  getElementById(id) {\n    let result = mutation.query(this, function(n) {\n      return n.id == id;\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  }\n\n}, fragmentMixin);\n\nObject.defineProperties(documentMixin, {\n  '_activeElement': ActiveElementAccessor.activeElement\n});\n\nlet nativeBlur = HTMLElement.prototype.blur;\n\nlet htmlElementMixin = utils.extendAll({\n  /**\n   * @this {HTMLElement}\n   */\n  blur() {\n    let root = this.__shady && this.__shady.root;\n    let shadowActive = root && root.activeElement;\n    if (shadowActive) {\n      shadowActive.blur();\n    } else {\n      nativeBlur.call(this);\n    }\n  }\n})\n\nfunction patchBuiltin(proto, obj) {\n  let n$ = Object.getOwnPropertyNames(obj);\n  for (let i=0; i < n$.length; i++) {\n    let n = n$[i];\n    let d = Object.getOwnPropertyDescriptor(obj, n);\n    // NOTE: we prefer writing directly here because some browsers\n    // have descriptors that are writable but not configurable (e.g.\n    // `appendChild` on older browsers)\n    if (d.value) {\n      proto[n] = d.value;\n    } else {\n      Object.defineProperty(proto, n, d);\n    }\n  }\n}\n\n\n// Apply patches to builtins (e.g. Element.prototype). Some of these patches\n// can be done unconditionally (mostly methods like\n// `Element.prototype.appendChild`) and some can only be done when the browser\n// has proper descriptors on the builtin prototype\n// (e.g. `Element.prototype.firstChild`)`. When descriptors are not available,\n// elements are individually patched when needed (see e.g.\n// `patchInside/OutsideElementAccessors` in `patch-accessors.js`).\nexport function patchBuiltins() {\n  let nativeHTMLElement =\n    (window['customElements'] && window['customElements']['nativeHTMLElement']) ||\n    HTMLElement;\n  // These patches can always be done, for all supported browsers.\n  patchBuiltin(window.Node.prototype, nodeMixin);\n  patchBuiltin(window.Window.prototype, windowMixin);\n  patchBuiltin(window.Text.prototype, textMixin);\n  patchBuiltin(window.DocumentFragment.prototype, fragmentMixin);\n  patchBuiltin(window.Element.prototype, elementMixin);\n  patchBuiltin(window.Document.prototype, documentMixin);\n  if (window.HTMLSlotElement) {\n    patchBuiltin(window.HTMLSlotElement.prototype, slotMixin);\n  }\n  patchBuiltin(nativeHTMLElement.prototype, htmlElementMixin);\n  // These patches can *only* be done\n  // on browsers that have proper property descriptors on builtin prototypes.\n  // This includes: IE11, Edge, Chrome >= 4?; Safari >= 10, Firefox\n  // On older browsers (Chrome <= 4?, Safari 9), a per element patching\n  // strategy is used for patching accessors.\n  if (utils.settings.hasDescriptors) {\n    patchAccessors(window.Node.prototype);\n    patchAccessors(window.Text.prototype);\n    patchAccessors(window.DocumentFragment.prototype);\n    patchAccessors(window.Element.prototype);\n    patchAccessors(nativeHTMLElement.prototype);\n    patchAccessors(window.Document.prototype);\n    if (window.HTMLSlotElement) {\n      patchAccessors(window.HTMLSlotElement.prototype);\n    }\n  }\n}\n","const reservedTagList = new Set([\n  'annotation-xml',\n  'color-profile',\n  'font-face',\n  'font-face-src',\n  'font-face-uri',\n  'font-face-format',\n  'font-face-name',\n  'missing-glyph',\n]);\n\n/**\n * @param {string} localName\n * @returns {boolean}\n */\nexport function isValidCustomElementName(localName) {\n  const reserved = reservedTagList.has(localName);\n  const validForm = /^[a-z][.0-9_a-z]*-[\\-.0-9_a-z]*$/.test(localName);\n  return !reserved && validForm;\n}\n\n/**\n * @private\n * @param {!Node} node\n * @return {boolean}\n */\nexport function isConnected(node) {\n  // Use `Node#isConnected`, if defined.\n  const nativeValue = node.isConnected;\n  if (nativeValue !== undefined) {\n    return nativeValue;\n  }\n\n  /** @type {?Node|undefined} */\n  let current = node;\n  while (current && !(current.__CE_isImportDocument || current instanceof Document)) {\n    current = current.parentNode || (window.ShadowRoot && current instanceof ShadowRoot ? current.host : undefined);\n  }\n  return !!(current && (current.__CE_isImportDocument || current instanceof Document));\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextSiblingOrAncestorSibling(root, start) {\n  let node = start;\n  while (node && node !== root && !node.nextSibling) {\n    node = node.parentNode;\n  }\n  return (!node || node === root) ? null : node.nextSibling;\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextNode(root, start) {\n  return start.firstChild ? start.firstChild : nextSiblingOrAncestorSibling(root, start);\n}\n\n/**\n * @param {!Node} root\n * @param {!function(!Element)} callback\n * @param {!Set<Node>=} visitedImports\n */\nexport function walkDeepDescendantElements(root, callback, visitedImports = new Set()) {\n  let node = root;\n  while (node) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      const element = /** @type {!Element} */(node);\n\n      callback(element);\n\n      const localName = element.localName;\n      if (localName === 'link' && element.getAttribute('rel') === 'import') {\n        // If this import (polyfilled or not) has it's root node available,\n        // walk it.\n        const importNode = /** @type {!Node} */ (element.import);\n        if (importNode instanceof Node && !visitedImports.has(importNode)) {\n          // Prevent multiple walks of the same import root.\n          visitedImports.add(importNode);\n\n          for (let child = importNode.firstChild; child; child = child.nextSibling) {\n            walkDeepDescendantElements(child, callback, visitedImports);\n          }\n        }\n\n        // Ignore descendants of import links to prevent attempting to walk the\n        // elements created by the HTML Imports polyfill that we just walked\n        // above.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      } else if (localName === 'template') {\n        // Ignore descendants of templates. There shouldn't be any descendants\n        // because they will be moved into `.content` during construction in\n        // browsers that support template but, in case they exist and are still\n        // waiting to be moved by a polyfill, they will be ignored.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      }\n\n      // Walk shadow roots.\n      const shadowRoot = element.__CE_shadowRoot;\n      if (shadowRoot) {\n        for (let child = shadowRoot.firstChild; child; child = child.nextSibling) {\n          walkDeepDescendantElements(child, callback, visitedImports);\n        }\n      }\n    }\n\n    node = nextNode(root, node);\n  }\n}\n\n/**\n * Used to suppress Closure's \"Modifying the prototype is only allowed if the\n * constructor is in the same scope\" warning without using\n * `@suppress {newCheckTypes, duplicate}` because `newCheckTypes` is too broad.\n *\n * @param {!Object} destination\n * @param {string} name\n * @param {*} value\n */\nexport function setPropertyUnchecked(destination, name, value) {\n  destination[name] = value;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/*\nExtremely simple css parser. Intended to be not more than what we need\nand definitely not necessarily correct =).\n*/\n\n'use strict';\n\n/** @unrestricted */\nclass StyleNode {\n  constructor() {\n    /** @type {number} */\n    this['start'] = 0;\n    /** @type {number} */\n    this['end'] = 0;\n    /** @type {StyleNode} */\n    this['previous'] = null;\n    /** @type {StyleNode} */\n    this['parent'] = null;\n    /** @type {Array<StyleNode>} */\n    this['rules'] = null;\n    /** @type {string} */\n    this['parsedCssText'] = '';\n    /** @type {string} */\n    this['cssText'] = '';\n    /** @type {boolean} */\n    this['atRule'] = false;\n    /** @type {number} */\n    this['type'] = 0;\n    /** @type {string} */\n    this['keyframesName'] = '';\n    /** @type {string} */\n    this['selector'] = '';\n    /** @type {string} */\n    this['parsedSelector'] = '';\n  }\n}\n\nexport {StyleNode}\n\n// given a string of css, return a simple rule tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nexport function parse(text) {\n  text = clean(text);\n  return parseCss(lex(text), text);\n}\n\n// remove stuff we don't care about that may hinder parsing\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction clean(cssText) {\n  return cssText.replace(RX.comments, '').replace(RX.port, '');\n}\n\n// super simple {...} lexer that returns a node tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nfunction lex(text) {\n  let root = new StyleNode();\n  root['start'] = 0;\n  root['end'] = text.length\n  let n = root;\n  for (let i = 0, l = text.length; i < l; i++) {\n    if (text[i] === OPEN_BRACE) {\n      if (!n['rules']) {\n        n['rules'] = [];\n      }\n      let p = n;\n      let previous = p['rules'][p['rules'].length - 1] || null;\n      n = new StyleNode();\n      n['start'] = i + 1;\n      n['parent'] = p;\n      n['previous'] = previous;\n      p['rules'].push(n);\n    } else if (text[i] === CLOSE_BRACE) {\n      n['end'] = i + 1;\n      n = n['parent'] || root;\n    }\n  }\n  return root;\n}\n\n// add selectors/cssText to node tree\n/**\n * @param {StyleNode} node\n * @param {string} text\n * @return {StyleNode}\n */\nfunction parseCss(node, text) {\n  let t = text.substring(node['start'], node['end'] - 1);\n  node['parsedCssText'] = node['cssText'] = t.trim();\n  if (node['parent']) {\n    let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];\n    t = text.substring(ss, node['start'] - 1);\n    t = _expandUnicodeEscapes(t);\n    t = t.replace(RX.multipleSpaces, ' ');\n    // TODO(sorvell): ad hoc; make selector include only after last ;\n    // helps with mixin syntax\n    t = t.substring(t.lastIndexOf(';') + 1);\n    let s = node['parsedSelector'] = node['selector'] = t.trim();\n    node['atRule'] = (s.indexOf(AT_START) === 0);\n    // note, support a subset of rule types...\n    if (node['atRule']) {\n      if (s.indexOf(MEDIA_START) === 0) {\n        node['type'] = types.MEDIA_RULE;\n      } else if (s.match(RX.keyframesRule)) {\n        node['type'] = types.KEYFRAMES_RULE;\n        node['keyframesName'] =\n          node['selector'].split(RX.multipleSpaces).pop();\n      }\n    } else {\n      if (s.indexOf(VAR_START) === 0) {\n        node['type'] = types.MIXIN_RULE;\n      } else {\n        node['type'] = types.STYLE_RULE;\n      }\n    }\n  }\n  let r$ = node['rules'];\n  if (r$) {\n    for (let i = 0, l = r$.length, r;\n      (i < l) && (r = r$[i]); i++) {\n      parseCss(r, text);\n    }\n  }\n  return node;\n}\n\n/**\n * conversion of sort unicode escapes with spaces like `\\33 ` (and longer) into\n * expanded form that doesn't require trailing space `\\000033`\n * @param {string} s\n * @return {string}\n */\nfunction _expandUnicodeEscapes(s) {\n  return s.replace(/\\\\([0-9a-f]{1,6})\\s/gi, function() {\n    let code = arguments[1],\n      repeat = 6 - code.length;\n    while (repeat--) {\n      code = '0' + code;\n    }\n    return '\\\\' + code;\n  });\n}\n\n/**\n * stringify parsed css.\n * @param {StyleNode} node\n * @param {boolean=} preserveProperties\n * @param {string=} text\n * @return {string}\n */\nexport function stringify(node, preserveProperties, text = '') {\n  // calc rule cssText\n  let cssText = '';\n  if (node['cssText'] || node['rules']) {\n    let r$ = node['rules'];\n    if (r$ && !_hasMixinRules(r$)) {\n      for (let i = 0, l = r$.length, r;\n        (i < l) && (r = r$[i]); i++) {\n        cssText = stringify(r, preserveProperties, cssText);\n      }\n    } else {\n      cssText = preserveProperties ? node['cssText'] :\n        removeCustomProps(node['cssText']);\n      cssText = cssText.trim();\n      if (cssText) {\n        cssText = '  ' + cssText + '\\n';\n      }\n    }\n  }\n  // emit rule if there is cssText\n  if (cssText) {\n    if (node['selector']) {\n      text += node['selector'] + ' ' + OPEN_BRACE + '\\n';\n    }\n    text += cssText;\n    if (node['selector']) {\n      text += CLOSE_BRACE + '\\n\\n';\n    }\n  }\n  return text;\n}\n\n/**\n * @param {Array<StyleNode>} rules\n * @return {boolean}\n */\nfunction _hasMixinRules(rules) {\n  let r = rules[0];\n  return Boolean(r) && Boolean(r['selector']) && r['selector'].indexOf(VAR_START) === 0;\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomProps(cssText) {\n  cssText = removeCustomPropAssignment(cssText);\n  return removeCustomPropApply(cssText);\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nexport function removeCustomPropAssignment(cssText) {\n  return cssText\n    .replace(RX.customProp, '')\n    .replace(RX.mixinProp, '');\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomPropApply(cssText) {\n  return cssText\n    .replace(RX.mixinApply, '')\n    .replace(RX.varApply, '');\n}\n\n/** @enum {number} */\nexport const types = {\n  STYLE_RULE: 1,\n  KEYFRAMES_RULE: 7,\n  MEDIA_RULE: 4,\n  MIXIN_RULE: 1000\n}\n\nconst OPEN_BRACE = '{';\nconst CLOSE_BRACE = '}';\n\n// helper regexp's\nconst RX = {\n  comments: /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//gim,\n  port: /@import[^;]*;/gim,\n  customProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?(?:[;\\n]|$)/gim,\n  mixinProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?{[^}]*?}(?:[;\\n]|$)?/gim,\n  mixinApply: /@apply\\s*\\(?[^);]*\\)?\\s*(?:[;\\n]|$)?/gim,\n  varApply: /[^;:]*?:[^;]*?var\\([^;]*\\)(?:[;\\n]|$)?/gim,\n  keyframesRule: /^@[^\\s]*keyframes/,\n  multipleSpaces: /\\s+/g\n}\n\nconst VAR_START = '--';\nconst MEDIA_START = '@media';\nconst AT_START = '@';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport let nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);\nexport let nativeCssVariables;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n  if (settings && settings['shimcssproperties']) {\n    nativeCssVariables = false;\n  } else {\n    // chrome 49 has semi-working css vars, check if box-shadow works\n    // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n    // However, shim css custom properties are only supported with ShadyDOM enabled,\n    // so fall back on native if we do not detect ShadyDOM\n    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match('AppleWebKit/601') &&\n      window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));\n  }\n}\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n  nativeCssVariables = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n  calcCssVariables(window.ShadyCSS);\n  // reset window variable to let ShadyCSS API take its place\n  window.ShadyCSS = undefined;\n} else {\n  calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow, nativeCssVariables} from './style-settings.js'\nimport {parse, stringify, types, StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport {MEDIA_MATCH} from './common-regex.js';\n\n/**\n * @param {string|StyleNode} rules\n * @param {function(StyleNode)=} callback\n * @return {string}\n */\nexport function toCssText (rules, callback) {\n  if (!rules) {\n    return '';\n  }\n  if (typeof rules === 'string') {\n    rules = parse(rules);\n  }\n  if (callback) {\n    forEachRule(rules, callback);\n  }\n  return stringify(rules, nativeCssVariables);\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @return {StyleNode}\n */\nexport function rulesForStyle(style) {\n  if (!style['__cssRules'] && style.textContent) {\n    style['__cssRules'] = parse(style.textContent);\n  }\n  return style['__cssRules'] || null;\n}\n\n// Tests if a rule is a keyframes selector, which looks almost exactly\n// like a normal selector but is not (it has nothing to do with scoping\n// for example).\n/**\n * @param {StyleNode} rule\n * @return {boolean}\n */\nexport function isKeyframesSelector(rule) {\n  return Boolean(rule['parent']) &&\n  rule['parent']['type'] === types.KEYFRAMES_RULE;\n}\n\n/**\n * @param {StyleNode} node\n * @param {Function=} styleRuleCallback\n * @param {Function=} keyframesRuleCallback\n * @param {boolean=} onlyActiveRules\n */\nexport function forEachRule(node, styleRuleCallback, keyframesRuleCallback, onlyActiveRules) {\n  if (!node) {\n    return;\n  }\n  let skipRules = false;\n  let type = node['type'];\n  if (onlyActiveRules) {\n    if (type === types.MEDIA_RULE) {\n      let matchMedia = node['selector'].match(MEDIA_MATCH);\n      if (matchMedia) {\n        // if rule is a non matching @media rule, skip subrules\n        if (!window.matchMedia(matchMedia[1]).matches) {\n          skipRules = true;\n        }\n      }\n    }\n  }\n  if (type === types.STYLE_RULE) {\n    styleRuleCallback(node);\n  } else if (keyframesRuleCallback &&\n    type === types.KEYFRAMES_RULE) {\n    keyframesRuleCallback(node);\n  } else if (type === types.MIXIN_RULE) {\n    skipRules = true;\n  }\n  let r$ = node['rules'];\n  if (r$ && !skipRules) {\n    for (let i=0, l=r$.length, r; (i<l) && (r=r$[i]); i++) {\n      forEachRule(r, styleRuleCallback, keyframesRuleCallback, onlyActiveRules);\n    }\n  }\n}\n\n// add a string of cssText to the document.\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @param {Node} target\n * @param {Node} contextNode\n * @return {HTMLStyleElement}\n */\nexport function applyCss(cssText, moniker, target, contextNode) {\n  let style = createScopeStyle(cssText, moniker);\n  applyStyle(style, target, contextNode);\n  return style;\n}\n\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @return {HTMLStyleElement}\n */\nexport function createScopeStyle(cssText, moniker) {\n  let style = /** @type {HTMLStyleElement} */(document.createElement('style'));\n  if (moniker) {\n    style.setAttribute('scope', moniker);\n  }\n  style.textContent = cssText;\n  return style;\n}\n\n/**\n * Track the position of the last added style for placing placeholders\n * @type {Node}\n */\nlet lastHeadApplyNode = null;\n\n// insert a comment node as a styling position placeholder.\n/**\n * @param {string} moniker\n * @return {!Comment}\n */\nexport function applyStylePlaceHolder(moniker) {\n  let placeHolder = document.createComment(' Shady DOM styles for ' +\n    moniker + ' ');\n  let after = lastHeadApplyNode ?\n    lastHeadApplyNode['nextSibling'] : null;\n  let scope = document.head;\n  scope.insertBefore(placeHolder, after || scope.firstChild);\n  lastHeadApplyNode = placeHolder;\n  return placeHolder;\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @param {?Node} target\n * @param {?Node} contextNode\n */\nexport function applyStyle(style, target, contextNode) {\n  target = target || document.head;\n  let after = (contextNode && contextNode.nextSibling) ||\n    target.firstChild;\n  target.insertBefore(style, after);\n  if (!lastHeadApplyNode) {\n    lastHeadApplyNode = style;\n  } else {\n    // only update lastHeadApplyNode if the new style is inserted after the old lastHeadApplyNode\n    let position = style.compareDocumentPosition(lastHeadApplyNode);\n    if (position === Node.DOCUMENT_POSITION_PRECEDING) {\n      lastHeadApplyNode = style;\n    }\n  }\n}\n\n/**\n * @param {string} buildType\n * @return {boolean}\n */\nexport function isTargetedBuild(buildType) {\n  return nativeShadow ? buildType === 'shadow' : buildType === 'shady';\n}\n\n/**\n * @param {Element} element\n * @return {?string}\n */\nexport function getCssBuildType(element) {\n  return element.getAttribute('css-build');\n}\n\n/**\n * Walk from text[start] matching parens and\n * returns position of the outer end paren\n * @param {string} text\n * @param {number} start\n * @return {number}\n */\nfunction findMatchingParen(text, start) {\n  let level = 0;\n  for (let i=start, l=text.length; i < l; i++) {\n    if (text[i] === '(') {\n      level++;\n    } else if (text[i] === ')') {\n      if (--level === 0) {\n        return i;\n      }\n    }\n  }\n  return -1;\n}\n\n/**\n * @param {string} str\n * @param {function(string, string, string, string)} callback\n */\nexport function processVariableAndFallback(str, callback) {\n  // find 'var('\n  let start = str.indexOf('var(');\n  if (start === -1) {\n    // no var?, everything is prefix\n    return callback(str, '', '', '');\n  }\n  //${prefix}var(${inner})${suffix}\n  let end = findMatchingParen(str, start + 3);\n  let inner = str.substring(start + 4, end);\n  let prefix = str.substring(0, start);\n  // suffix may have other variables\n  let suffix = processVariableAndFallback(str.substring(end + 1), callback);\n  let comma = inner.indexOf(',');\n  // value and fallback args should be trimmed to match in property lookup\n  if (comma === -1) {\n    // variable, no fallback\n    return callback(prefix, inner.trim(), '', suffix);\n  }\n  // var(${value},${fallback})\n  let value = inner.substring(0, comma).trim();\n  let fallback = inner.substring(comma + 1).trim();\n  return callback(prefix, value, fallback, suffix);\n}\n\n/**\n * @param {Element} element\n * @param {string} value\n */\nexport function setElementClassRaw(element, value) {\n  // use native setAttribute provided by ShadyDOM when setAttribute is patched\n  if (nativeShadow) {\n    element.setAttribute('class', value);\n  } else {\n    window['ShadyDOM']['nativeMethods']['setAttribute'].call(element, 'class', value);\n  }\n}\n\n/**\n * @param {Element | {is: string, extends: string}} element\n * @return {{is: string, typeExtension: string}}\n */\nexport function getIsExtends(element) {\n  let localName = element['localName'];\n  let is = '', typeExtension = '';\n  /*\n  NOTE: technically, this can be wrong for certain svg elements\n  with `-` in the name like `<font-face>`\n  */\n  if (localName) {\n    if (localName.indexOf('-') > -1) {\n      is = localName;\n    } else {\n      typeExtension = localName;\n      is = (element.getAttribute && element.getAttribute('is')) || '';\n    }\n  } else {\n    is = /** @type {?} */(element).is;\n    typeExtension = /** @type {?} */(element).extends;\n  }\n  return {is, typeExtension};\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {removeCustomPropAssignment, StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport {nativeShadow} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport * as StyleUtil from './style-util.js'\nimport * as RX from './common-regex.js'\nimport StyleInfo from './style-info.js'\n\n// TODO: dedupe with shady\n/**\n * @const {function(string):boolean}\n */\nconst matchesSelector = ((p) => p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\np.oMatchesSelector || p.webkitMatchesSelector)(window.Element.prototype);\n\nconst IS_IE = navigator.userAgent.match('Trident');\n\nconst XSCOPE_NAME = 'x-scope';\n\nclass StyleProperties {\n  get XSCOPE_NAME() {\n    return XSCOPE_NAME;\n  }\n/**\n * decorates styles with rule info and returns an array of used style property names\n *\n * @param {StyleNode} rules\n * @return {Array<string>}\n */\n  decorateStyles(rules) {\n    let self = this, props = {}, keyframes = [], ruleIndex = 0;\n    StyleUtil.forEachRule(rules, function(rule) {\n      self.decorateRule(rule);\n      // mark in-order position of ast rule in styles block, used for cache key\n      rule.index = ruleIndex++;\n      self.collectPropertiesInCssText(rule.propertyInfo.cssText, props);\n    }, function onKeyframesRule(rule) {\n      keyframes.push(rule);\n    });\n    // Cache all found keyframes rules for later reference:\n    rules._keyframes = keyframes;\n    // return this list of property names *consumes* in these styles.\n    let names = [];\n    for (let i in props) {\n      names.push(i);\n    }\n    return names;\n  }\n\n  // decorate a single rule with property info\n  decorateRule(rule) {\n    if (rule.propertyInfo) {\n      return rule.propertyInfo;\n    }\n    let info = {}, properties = {};\n    let hasProperties = this.collectProperties(rule, properties);\n    if (hasProperties) {\n      info.properties = properties;\n      // TODO(sorvell): workaround parser seeing mixins as additional rules\n      rule['rules'] = null;\n    }\n    info.cssText = this.collectCssText(rule);\n    rule.propertyInfo = info;\n    return info;\n  }\n\n  // collects the custom properties from a rule's cssText\n  collectProperties(rule, properties) {\n    let info = rule.propertyInfo;\n    if (info) {\n      if (info.properties) {\n        Object.assign(properties, info.properties);\n        return true;\n      }\n    } else {\n      let m, rx = RX.VAR_ASSIGN;\n      let cssText = rule['parsedCssText'];\n      let value;\n      let any;\n      while ((m = rx.exec(cssText))) {\n        // note: group 2 is var, 3 is mixin\n        value = (m[2] || m[3]).trim();\n        // value of 'inherit' or 'unset' is equivalent to not setting the property here\n        if (value !== 'inherit' || value !== 'unset') {\n          properties[m[1].trim()] = value;\n        }\n        any = true;\n      }\n      return any;\n    }\n\n  }\n\n  // returns cssText of properties that consume variables/mixins\n  collectCssText(rule) {\n    return this.collectConsumingCssText(rule['parsedCssText']);\n  }\n\n  // NOTE: we support consumption inside mixin assignment\n  // but not production, so strip out {...}\n  collectConsumingCssText(cssText) {\n    return cssText.replace(RX.BRACKETED, '')\n      .replace(RX.VAR_ASSIGN, '');\n  }\n\n  collectPropertiesInCssText(cssText, props) {\n    let m;\n    while ((m = RX.VAR_CONSUMED.exec(cssText))) {\n      let name = m[1];\n      // This regex catches all variable names, and following non-whitespace char\n      // If next char is not ':', then variable is a consumer\n      if (m[2] !== ':') {\n        props[name] = true;\n      }\n    }\n  }\n\n  // turns custom properties into realized values.\n  reify(props) {\n    // big perf optimization here: reify only *own* properties\n    // since this object has __proto__ of the element's scope properties\n    let names = Object.getOwnPropertyNames(props);\n    for (let i=0, n; i < names.length; i++) {\n      n = names[i];\n      props[n] = this.valueForProperty(props[n], props);\n    }\n  }\n\n  // given a property value, returns the reified value\n  // a property value may be:\n  // (1) a literal value like: red or 5px;\n  // (2) a variable value like: var(--a), var(--a, red), or var(--a, --b) or\n  // var(--a, var(--b));\n  // (3) a literal mixin value like { properties }. Each of these properties\n  // can have values that are: (a) literal, (b) variables, (c) @apply mixins.\n  valueForProperty(property, props) {\n    // case (1) default\n    // case (3) defines a mixin and we have to reify the internals\n    if (property) {\n      if (property.indexOf(';') >=0) {\n        property = this.valueForProperties(property, props);\n      } else {\n        // case (2) variable\n        let self = this;\n        let fn = function(prefix, value, fallback, suffix) {\n          if (!value) {\n            return prefix + suffix;\n          }\n          let propertyValue = self.valueForProperty(props[value], props);\n          // if value is \"initial\", then the variable should be treated as unset\n          if (!propertyValue || propertyValue === 'initial') {\n            // fallback may be --a or var(--a) or literal\n            propertyValue = self.valueForProperty(props[fallback] || fallback, props) ||\n            fallback;\n          } else if (propertyValue === 'apply-shim-inherit') {\n            // CSS build will replace `inherit` with `apply-shim-inherit`\n            // for use with native css variables.\n            // Since we have full control, we can use `inherit` directly.\n            propertyValue = 'inherit';\n          }\n          return prefix + (propertyValue || '') + suffix;\n        };\n        property = StyleUtil.processVariableAndFallback(property, fn);\n      }\n    }\n    return property && property.trim() || '';\n  }\n\n  // note: we do not yet support mixin within mixin\n  valueForProperties(property, props) {\n    let parts = property.split(';');\n    for (let i=0, p, m; i<parts.length; i++) {\n      if ((p = parts[i])) {\n        RX.MIXIN_MATCH.lastIndex = 0;\n        m = RX.MIXIN_MATCH.exec(p);\n        if (m) {\n          p = this.valueForProperty(props[m[1]], props);\n        } else {\n          let colon = p.indexOf(':');\n          if (colon !== -1) {\n            let pp = p.substring(colon);\n            pp = pp.trim();\n            pp = this.valueForProperty(pp, props) || pp;\n            p = p.substring(0, colon) + pp;\n          }\n        }\n        parts[i] = (p && p.lastIndexOf(';') === p.length - 1) ?\n          // strip trailing ;\n          p.slice(0, -1) :\n          p || '';\n      }\n    }\n    return parts.join(';');\n  }\n\n  applyProperties(rule, props) {\n    let output = '';\n    // dynamically added sheets may not be decorated so ensure they are.\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (rule.propertyInfo.cssText) {\n      output = this.valueForProperties(rule.propertyInfo.cssText, props);\n    }\n    rule['cssText'] = output;\n  }\n\n  // Apply keyframe transformations to the cssText of a given rule. The\n  // keyframeTransforms object is a map of keyframe names to transformer\n  // functions which take in cssText and spit out transformed cssText.\n  applyKeyframeTransforms(rule, keyframeTransforms) {\n    let input = rule['cssText'];\n    let output = rule['cssText'];\n    if (rule.hasAnimations == null) {\n      // Cache whether or not the rule has any animations to begin with:\n      rule.hasAnimations = RX.ANIMATION_MATCH.test(input);\n    }\n    // If there are no animations referenced, we can skip transforms:\n    if (rule.hasAnimations) {\n      let transform;\n      // If we haven't transformed this rule before, we iterate over all\n      // transforms:\n      if (rule.keyframeNamesToTransform == null) {\n        rule.keyframeNamesToTransform = [];\n        for (let keyframe in keyframeTransforms) {\n          transform = keyframeTransforms[keyframe];\n          output = transform(input);\n          // If the transform actually changed the CSS text, we cache the\n          // transform name for future use:\n          if (input !== output) {\n            input = output;\n            rule.keyframeNamesToTransform.push(keyframe);\n          }\n        }\n      } else {\n        // If we already have a list of keyframe names that apply to this\n        // rule, we apply only those keyframe name transforms:\n        for (let i = 0; i < rule.keyframeNamesToTransform.length; ++i) {\n          transform = keyframeTransforms[rule.keyframeNamesToTransform[i]];\n          input = transform(input);\n        }\n        output = input;\n      }\n    }\n    rule['cssText'] = output;\n  }\n\n  // Test if the rules in these styles matches the given `element` and if so,\n  // collect any custom properties into `props`.\n  /**\n   * @param {StyleNode} rules\n   * @param {Element} element\n   */\n  propertyDataFromStyles(rules, element) {\n    let props = {}, self = this;\n    // generates a unique key for these matches\n    let o = [];\n    // note: active rules excludes non-matching @media rules\n    StyleUtil.forEachRule(rules, function(rule) {\n      // TODO(sorvell): we could trim the set of rules at declaration\n      // time to only include ones that have properties\n      if (!rule.propertyInfo) {\n        self.decorateRule(rule);\n      }\n      // match element against transformedSelector: selector may contain\n      // unwanted uniquification and parsedSelector does not directly match\n      // for :host selectors.\n      let selectorToMatch = rule.transformedSelector || rule['parsedSelector'];\n      if (element && rule.propertyInfo.properties && selectorToMatch) {\n        if (matchesSelector.call(element, selectorToMatch)) {\n          self.collectProperties(rule, props);\n          // produce numeric key for these matches for lookup\n          addToBitMask(rule.index, o);\n        }\n      }\n    }, null, true);\n    return {properties: props, key: o};\n  }\n\n  /**\n   * @param {Element} scope\n   * @param {StyleNode} rule\n   * @param {string|undefined} cssBuild\n   * @param {function(Object)} callback\n   */\n  whenHostOrRootRule(scope, rule, cssBuild, callback) {\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (!rule.propertyInfo.properties) {\n      return;\n    }\n    let {is, typeExtension} = StyleUtil.getIsExtends(scope);\n    let hostScope = is ?\n      StyleTransformer._calcHostScope(is, typeExtension) :\n      'html';\n    let parsedSelector = rule['parsedSelector'];\n    let isRoot = (parsedSelector === ':host > *' || parsedSelector === 'html');\n    let isHost = parsedSelector.indexOf(':host') === 0 && !isRoot;\n    // build info is either in scope (when scope is an element) or in the style\n    // when scope is the default scope; note: this allows default scope to have\n    // mixed mode built and unbuilt styles.\n    if (cssBuild === 'shady') {\n      // :root -> x-foo > *.x-foo for elements and html for custom-style\n      isRoot = parsedSelector === (hostScope + ' > *.' + hostScope) || parsedSelector.indexOf('html') !== -1;\n      // :host -> x-foo for elements, but sub-rules have .x-foo in them\n      isHost = !isRoot && parsedSelector.indexOf(hostScope) === 0;\n    }\n    if (cssBuild === 'shadow') {\n      isRoot = parsedSelector === ':host > *' || parsedSelector === 'html';\n      isHost = isHost && !isRoot;\n    }\n    if (!isRoot && !isHost) {\n      return;\n    }\n    let selectorToMatch = hostScope;\n    if (isHost) {\n      // need to transform :host under ShadowDOM because `:host` does not work with `matches`\n      if (nativeShadow && !rule.transformedSelector) {\n        // transform :host into a matchable selector\n        rule.transformedSelector =\n        StyleTransformer._transformRuleCss(\n          rule,\n          StyleTransformer._transformComplexSelector,\n          StyleTransformer._calcElementScope(is),\n          hostScope\n        );\n      }\n      selectorToMatch = rule.transformedSelector || hostScope;\n    }\n    callback({\n      selector: selectorToMatch,\n      isHost: isHost,\n      isRoot: isRoot\n    });\n  }\n/**\n * @param {Element} scope\n * @param {StyleNode} rules\n * @return {Object}\n */\n  hostAndRootPropertiesForScope(scope, rules) {\n    let hostProps = {}, rootProps = {}, self = this;\n    // note: active rules excludes non-matching @media rules\n    let cssBuild = rules && rules['__cssBuild'];\n    StyleUtil.forEachRule(rules, function(rule) {\n      // if scope is StyleDefaults, use _element for matchesSelector\n      self.whenHostOrRootRule(scope, rule, cssBuild, function(info) {\n        let element = scope._element || scope;\n        if (matchesSelector.call(element, info.selector)) {\n          if (info.isHost) {\n            self.collectProperties(rule, hostProps);\n          } else {\n            self.collectProperties(rule, rootProps);\n          }\n        }\n      });\n    }, null, true);\n    return {rootProps: rootProps, hostProps: hostProps};\n  }\n\n  /**\n   * @param {Element} element\n   * @param {Object} properties\n   * @param {string} scopeSelector\n   */\n  transformStyles(element, properties, scopeSelector) {\n    let self = this;\n    let {is, typeExtension} = StyleUtil.getIsExtends(element);\n    let hostSelector = StyleTransformer\n      ._calcHostScope(is, typeExtension);\n    let rxHostSelector = element.extends ?\n      '\\\\' + hostSelector.slice(0, -1) + '\\\\]' :\n      hostSelector;\n    let hostRx = new RegExp(RX.HOST_PREFIX + rxHostSelector +\n      RX.HOST_SUFFIX);\n    let rules = StyleInfo.get(element).styleRules;\n    let keyframeTransforms =\n      this._elementKeyframeTransforms(element, rules, scopeSelector);\n    return StyleTransformer.elementStyles(element, rules, function(rule) {\n      self.applyProperties(rule, properties);\n      if (!nativeShadow &&\n          !StyleUtil.isKeyframesSelector(rule) &&\n          rule['cssText']) {\n        // NOTE: keyframe transforms only scope munge animation names, so it\n        // is not necessary to apply them in ShadowDOM.\n        self.applyKeyframeTransforms(rule, keyframeTransforms);\n        self._scopeSelector(rule, hostRx, hostSelector, scopeSelector);\n      }\n    });\n  }\n\n  /**\n   * @param {Element} element\n   * @param {StyleNode} rules\n   * @param {string} scopeSelector\n   * @return {Object}\n   */\n  _elementKeyframeTransforms(element, rules, scopeSelector) {\n    let keyframesRules = rules._keyframes;\n    let keyframeTransforms = {};\n    if (!nativeShadow && keyframesRules) {\n      // For non-ShadowDOM, we transform all known keyframes rules in\n      // advance for the current scope. This allows us to catch keyframes\n      // rules that appear anywhere in the stylesheet:\n      for (let i = 0, keyframesRule = keyframesRules[i];\n           i < keyframesRules.length;\n           keyframesRule = keyframesRules[++i]) {\n        this._scopeKeyframes(keyframesRule, scopeSelector);\n        keyframeTransforms[keyframesRule['keyframesName']] =\n            this._keyframesRuleTransformer(keyframesRule);\n      }\n    }\n    return keyframeTransforms;\n  }\n\n  // Generate a factory for transforming a chunk of CSS text to handle a\n  // particular scoped keyframes rule.\n  /**\n   * @param {StyleNode} keyframesRule\n   * @return {function(string):string}\n   */\n  _keyframesRuleTransformer(keyframesRule) {\n    return function(cssText) {\n      return cssText.replace(\n          keyframesRule.keyframesNameRx,\n          keyframesRule.transformedKeyframesName);\n    };\n  }\n\n/**\n * Transforms `@keyframes` names to be unique for the current host.\n * Example: @keyframes foo-anim -> @keyframes foo-anim-x-foo-0\n *\n * @param {StyleNode} rule\n * @param {string} scopeId\n */\n  _scopeKeyframes(rule, scopeId) {\n    rule.keyframesNameRx = new RegExp(rule['keyframesName'], 'g');\n    rule.transformedKeyframesName = rule['keyframesName'] + '-' + scopeId;\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    rule['selector'] = rule.transformedSelector.replace(\n        rule['keyframesName'], rule.transformedKeyframesName);\n  }\n\n  // Strategy: x scope shim a selector e.g. to scope `.x-foo-42` (via classes):\n  // non-host selector: .a.x-foo -> .x-foo-42 .a.x-foo\n  // host selector: x-foo.wide -> .x-foo-42.wide\n  // note: we use only the scope class (.x-foo-42) and not the hostSelector\n  // (x-foo) to scope :host rules; this helps make property host rules\n  // have low specificity. They are overrideable by class selectors but,\n  // unfortunately, not by type selectors (e.g. overriding via\n  // `.special` is ok, but not by `x-foo`).\n  /**\n   * @param {StyleNode} rule\n   * @param {RegExp} hostRx\n   * @param {string} hostSelector\n   * @param {string} scopeId\n   */\n  _scopeSelector(rule, hostRx, hostSelector, scopeId) {\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    let selector = rule.transformedSelector;\n    let scope = '.' + scopeId;\n    let parts = selector.split(',');\n    for (let i=0, l=parts.length, p; (i<l) && (p=parts[i]); i++) {\n      parts[i] = p.match(hostRx) ?\n        p.replace(hostSelector, scope) :\n        scope + ' ' + p;\n    }\n    rule['selector'] = parts.join(',');\n  }\n\n  /**\n   * @param {Element} element\n   * @param {string} selector\n   * @param {string} old\n   */\n  applyElementScopeSelector(element, selector, old) {\n    let c = element.getAttribute('class') || '';\n    let v = c;\n    if (old) {\n      v = c.replace(\n        new RegExp('\\\\s*' + XSCOPE_NAME + '\\\\s*' + old + '\\\\s*', 'g'), ' ');\n    }\n    v += (v ? ' ' : '') + XSCOPE_NAME + ' ' + selector;\n    if (c !== v) {\n      StyleUtil.setElementClassRaw(element, v);\n    }\n  }\n\n  /**\n   * @param {HTMLElement} element\n   * @param {Object} properties\n   * @param {string} selector\n   * @param {HTMLStyleElement} style\n   * @return {HTMLStyleElement}\n   */\n  applyElementStyle(element, properties, selector, style) {\n    // calculate cssText to apply\n    let cssText = style ? style.textContent || '' :\n      this.transformStyles(element, properties, selector);\n    // if shady and we have a cached style that is not style, decrement\n    let styleInfo = StyleInfo.get(element);\n    let s = styleInfo.customStyle;\n    if (s && !nativeShadow && (s !== style)) {\n      s['_useCount']--;\n      if (s['_useCount'] <= 0 && s.parentNode) {\n        s.parentNode.removeChild(s);\n      }\n    }\n    // apply styling always under native or if we generated style\n    // or the cached style is not in document(!)\n    if (nativeShadow) {\n      // update existing style only under native\n      if (styleInfo.customStyle) {\n        styleInfo.customStyle.textContent = cssText;\n        style = styleInfo.customStyle;\n      // otherwise, if we have css to apply, do so\n      } else if (cssText) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        style = StyleUtil.applyCss(cssText, selector, element.shadowRoot,\n          styleInfo.placeholder);\n      }\n    } else {\n      // shady and no cache hit\n      if (!style) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        if (cssText) {\n          style = StyleUtil.applyCss(cssText, selector, null,\n            styleInfo.placeholder);\n        }\n      // shady and cache hit but not in document\n      } else if (!style.parentNode) {\n        if (IS_IE && cssText.indexOf('@media') > -1) {\n            // @media rules may be stale in IE 10 and 11\n            // refresh the text content of the style to revalidate them.\n          style.textContent = cssText;\n        }\n        StyleUtil.applyStyle(style, null, styleInfo.placeholder);\n      }\n    }\n    // ensure this style is our custom style and increment its use count.\n    if (style) {\n      style['_useCount'] = style['_useCount'] || 0;\n      // increment use count if we changed styles\n      if (styleInfo.customStyle != style) {\n        style['_useCount']++;\n      }\n      styleInfo.customStyle = style;\n    }\n    return style;\n  }\n\n  /**\n   * @param {Element} style\n   * @param {Object} properties\n   */\n  applyCustomStyle(style, properties) {\n    let rules = StyleUtil.rulesForStyle(/** @type {HTMLStyleElement} */(style));\n    let self = this;\n    style.textContent = StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      let css = rule['cssText'] = rule['parsedCssText'];\n      if (rule.propertyInfo && rule.propertyInfo.cssText) {\n        // remove property assignments\n        // so next function isn't confused\n        // NOTE: we have 3 categories of css:\n        // (1) normal properties,\n        // (2) custom property assignments (--foo: red;),\n        // (3) custom property usage: border: var(--foo); @apply(--foo);\n        // In elements, 1 and 3 are separated for efficiency; here they\n        // are not and this makes this case unique.\n        css = removeCustomPropAssignment(/** @type {string} */(css));\n        // replace with reified properties, scenario is same as mixin\n        rule['cssText'] = self.valueForProperties(css, properties);\n      }\n    });\n  }\n}\n\n/**\n * @param {number} n\n * @param {Array<number>} bits\n */\nfunction addToBitMask(n, bits) {\n  let o = parseInt(n / 32, 10);\n  let v = 1 << (n % 32);\n  bits[o] = (bits[o] || 0) | v;\n}\n\nexport default new StyleProperties();","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport {getIsExtends} from './style-util.js'\n\nexport let flush = function() {};\n\n/**\n * @param {HTMLElement} element\n * @return {!Array<string>}\n */\nfunction getClasses(element) {\n  let classes = [];\n  if (element.classList) {\n    classes = Array.from(element.classList);\n  } else if (element instanceof window['SVGElement'] && element.hasAttribute('class')) {\n    classes = element.getAttribute('class').split(/\\s+/);\n  }\n  return classes;\n}\n\n/**\n * @param {HTMLElement} element\n * @return {string}\n */\nfunction getCurrentScope(element) {\n  let classes = getClasses(element);\n  let idx = classes.indexOf(StyleTransformer.SCOPE_NAME);\n  if (idx > -1) {\n    return classes[idx + 1];\n  }\n  return '';\n}\n\n/**\n * @param {Array<MutationRecord|null>|null} mxns\n */\nfunction handler(mxns) {\n  for (let x=0; x < mxns.length; x++) {\n    let mxn = mxns[x];\n    if (mxn.target === document.documentElement ||\n      mxn.target === document.head) {\n      continue;\n    }\n    for (let i=0; i < mxn.addedNodes.length; i++) {\n      let n = mxn.addedNodes[i];\n      if (n.nodeType !== Node.ELEMENT_NODE) {\n        continue;\n      }\n      n = /** @type {HTMLElement} */(n); // eslint-disable-line no-self-assign\n      let root = n.getRootNode();\n      let currentScope = getCurrentScope(n);\n      // node was scoped, but now is in document\n      if (currentScope && root === n.ownerDocument) {\n        StyleTransformer.dom(n, currentScope, true);\n      } else if (root.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n        let newScope;\n        let host = /** @type {ShadowRoot} */(root).host;\n        // element may no longer be in a shadowroot\n        if (!host) {\n          continue;\n        }\n        newScope = getIsExtends(host).is;\n        if (currentScope === newScope) {\n          continue;\n        }\n        if (currentScope) {\n          StyleTransformer.dom(n, currentScope, true);\n        }\n        StyleTransformer.dom(n, newScope);\n      }\n    }\n  }\n}\n\nif (!nativeShadow) {\n  let observer = new MutationObserver(handler);\n  let start = (node) => {\n    observer.observe(node, {childList: true, subtree: true});\n  }\n  let nativeCustomElements = (window['customElements'] &&\n    !window['customElements']['polyfillWrapFlushCallback']);\n  // need to start immediately with native custom elements\n  // TODO(dfreedm): with polyfilled HTMLImports and native custom elements\n  // excessive mutations may be observed; this can be optimized via cooperation\n  // with the HTMLImports polyfill.\n  if (nativeCustomElements) {\n    start(document);\n  } else {\n    let delayedStart = () => {\n      start(document.body);\n    }\n    // use polyfill timing if it's available\n    if (window['HTMLImports']) {\n      window['HTMLImports']['whenReady'](delayedStart);\n    // otherwise push beyond native imports being ready\n    // which requires RAF + readystate interactive.\n    } else {\n      requestAnimationFrame(function() {\n        if (document.readyState === 'loading') {\n          let listener = function() {\n            delayedStart();\n            document.removeEventListener('readystatechange', listener);\n          }\n          document.addEventListener('readystatechange', listener);\n        } else {\n          delayedStart();\n        }\n      });\n    }\n  }\n\n  flush = function() {\n    handler(observer.takeRecords());\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\nimport templateMap from './template-map.js'\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\n\n/*\n * Utilities for handling invalidating apply-shim mixins for a given template.\n *\n * The invalidation strategy involves keeping track of the \"current\" version of a template's mixins, and updating that count when a mixin is invalidated.\n * The template\n */\n\n/** @const {string} */\nconst CURRENT_VERSION = '_applyShimCurrentVersion';\n\n/** @const {string} */\nconst NEXT_VERSION = '_applyShimNextVersion';\n\n/** @const {string} */\nconst VALIDATING_VERSION = '_applyShimValidatingVersion';\n\n/**\n * @const {Promise<void>}\n */\nconst promise = Promise.resolve();\n\n/**\n * @param {string} elementName\n */\nexport function invalidate(elementName){\n  let template = templateMap[elementName];\n  if (template) {\n    invalidateTemplate(template);\n  }\n}\n\n/**\n * This function can be called multiple times to mark a template invalid\n * and signal that the style inside must be regenerated.\n *\n * Use `startValidatingTemplate` to begin an asynchronous validation cycle.\n * During that cycle, call `templateIsValidating` to see if the template must\n * be revalidated\n * @param {HTMLTemplateElement} template\n */\nexport function invalidateTemplate(template) {\n  // default the current version to 0\n  template[CURRENT_VERSION] = template[CURRENT_VERSION] || 0;\n  // ensure the \"validating for\" flag exists\n  template[VALIDATING_VERSION] = template[VALIDATING_VERSION] || 0;\n  // increment the next version\n  template[NEXT_VERSION] = (template[NEXT_VERSION] || 0) + 1;\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValid(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValid(template);\n  }\n  return true;\n}\n\n/**\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValid(template) {\n  return template[CURRENT_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValidating(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValidating(template);\n  }\n  return false;\n}\n\n/**\n * Returns true if the template is currently invalid and `startValidating` has been called since the last invalidation.\n * If false, the template must be validated.\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValidating(template) {\n  return !templateIsValid(template) && template[VALIDATING_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * the template is marked as `validating` for one microtask so that all instances\n * found in the tree crawl of `applyStyle` will update themselves,\n * but the template will only be updated once.\n * @param {string} elementName\n*/\nexport function startValidating(elementName) {\n  let template = templateMap[elementName];\n  startValidatingTemplate(template);\n}\n\n/**\n * Begin an asynchronous invalidation cycle.\n * This should be called after every validation of a template\n *\n * After one microtask, the template will be marked as valid until the next call to `invalidateTemplate`\n * @param {HTMLTemplateElement} template\n */\nexport function startValidatingTemplate(template) {\n  // remember that the current \"next version\" is the reason for this validation cycle\n  template[VALIDATING_VERSION] = template[NEXT_VERSION];\n  // however, there only needs to be one async task to clear the counters\n  if (!template._validating) {\n    template._validating = true;\n    promise.then(function() {\n      // sync the current version to let future invalidations cause a refresh cycle\n      template[CURRENT_VERSION] = template[NEXT_VERSION];\n      template._validating = false;\n    });\n  }\n}\n\n/**\n * @return {boolean}\n */\nexport function elementsAreInvalid() {\n  for (let elementName in templateMap) {\n    let template = templateMap[elementName];\n    if (!templateIsValid(template)) {\n      return true;\n    }\n  }\n  return false;\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {Promise<void>} */\nlet readyPromise = null;\n\n/** @type {?function(?function())} */\nlet whenReady = window['HTMLImports'] && window['HTMLImports']['whenReady'] || null;\n\n/** @type {function()} */\nlet resolveFn;\n\n/**\n * @param {?function()} callback\n */\nexport default function documentWait(callback) {\n  requestAnimationFrame(function() {\n    if (whenReady) {\n      whenReady(callback)\n    } else {\n      if (!readyPromise) {\n        readyPromise = new Promise((resolve) => {resolveFn = resolve});\n        if (document.readyState === 'complete') {\n          resolveFn();\n        } else {\n          document.addEventListener('readystatechange', () => {\n            if (document.readyState === 'complete') {\n              resolveFn();\n            }\n          });\n        }\n      }\n      readyPromise.then(function(){ callback && callback(); });\n    }\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js'\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n  // remove previous properties\n  for (let p in properties) {\n    // NOTE: for bc with shim, don't apply null values.\n    if (p === null) {\n      element.style.removeProperty(p);\n    } else {\n      element.style.setProperty(p, properties[p]);\n    }\n  }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n  /**\n   * @const {string}\n   */\n  const value = window.getComputedStyle(element).getPropertyValue(property);\n  if (!value) {\n    return '';\n  } else {\n    return value.trim();\n  }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n  const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n  // reset state of the regexes\n  MIXIN_MATCH.lastIndex = 0;\n  VAR_ASSIGN.lastIndex = 0;\n  return has;\n}\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function(scope) {\n\n  'use strict';\n\n  // defaultPrevented is broken in IE.\n  // https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called\n  var workingDefaultPrevented = (function() {\n    var e = document.createEvent('Event');\n    e.initEvent('foo', true, true);\n    e.preventDefault();\n    return e.defaultPrevented;\n  })();\n\n  if (!workingDefaultPrevented) {\n    var origPreventDefault = Event.prototype.preventDefault;\n    Event.prototype.preventDefault = function() {\n      if (!this.cancelable) {\n        return;\n      }\n\n      origPreventDefault.call(this);\n\n      Object.defineProperty(this, 'defaultPrevented', {\n        get: function() {\n          return true;\n        },\n        configurable: true\n      });\n    };\n  }\n\n  var isIE = /Trident/.test(navigator.userAgent);\n\n  // CustomEvent constructor shim\n  if (!window.CustomEvent || isIE && (typeof window.CustomEvent !== 'function')) {\n    window.CustomEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('CustomEvent');\n      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);\n      return e;\n    };\n    window.CustomEvent.prototype = window.Event.prototype;\n  }\n\n  // Event constructor shim\n  if (!window.Event || isIE && (typeof window.Event !== 'function')) {\n    var origEvent = window.Event;\n    window.Event = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('Event');\n      e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));\n      return e;\n    };\n    if (origEvent) {\n      for (var i in origEvent) {\n        window.Event[i] = origEvent[i];\n      }\n    }\n    window.Event.prototype = origEvent.prototype;\n  }\n\n  if (!window.MouseEvent || isIE && (typeof window.MouseEvent !== 'function')) {\n    var origMouseEvent = window.MouseEvent;\n    window.MouseEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('MouseEvent');\n      e.initMouseEvent(inType,\n        Boolean(params.bubbles), Boolean(params.cancelable),\n        params.view || window, params.detail,\n        params.screenX, params.screenY, params.clientX, params.clientY,\n        params.ctrlKey, params.altKey, params.shiftKey, params.metaKey,\n        params.button, params.relatedTarget);\n      return e;\n    };\n    if (origMouseEvent) {\n      for (var i in origMouseEvent) {\n        window.MouseEvent[i] = origMouseEvent[i];\n      }\n    }\n    window.MouseEvent.prototype = origMouseEvent.prototype;\n  }\n\n  // ES6 stuff\n  if (!Array.from) {\n    Array.from = function (object) {\n      return [].slice.call(object);\n    };\n  }\n\n  if (!Object.assign) {\n    var assign = function(target, source) {\n      var n$ = Object.getOwnPropertyNames(source);\n      for (var i=0, p; i < n$.length; i++) {\n        p = n$[i];\n        target[p] = source[p];\n      }\n    }\n\n    Object.assign = function(target, sources) {\n      var args = [].slice.call(arguments, 1);\n      for (var i=0, s; i < args.length; i++) {\n        s = args[i];\n        if (s) {\n          assign(target, s);\n        }\n      }\n      return target;\n    }\n  }\n\n})(window.WebComponents);\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n// minimal template polyfill\n(function() {\n\n  var needsTemplate = (typeof HTMLTemplateElement === 'undefined');\n\n  // NOTE: Patch document.importNode to work around IE11 bug that\n  // casues children of a document fragment imported while\n  // there is a mutation observer to not have a parentNode (!?!)\n  // It's important that this is the first patch to `importNode` so that\n  // dom produced for later patches is correct.\n  if (/Trident/.test(navigator.userAgent)) {\n    (function() {\n      var Native_importNode = Document.prototype.importNode;\n      Document.prototype.importNode = function() {\n        var n = Native_importNode.apply(this, arguments);\n        // Copy all children to a new document fragment since\n        // this one may be broken\n        if (n.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n          var f = this.createDocumentFragment();\n          f.appendChild(n);\n          return f;\n        } else {\n          return n;\n        }\n      };\n    })();\n  }\n\n  // NOTE: we rely on this cloneNode not causing element upgrade.\n  // This means this polyfill must load before the CE polyfill and\n  // this would need to be re-worked if a browser supports native CE\n  // but not <template>.\n  var Native_cloneNode = Node.prototype.cloneNode;\n  var Native_createElement = Document.prototype.createElement;\n  var Native_importNode = Document.prototype.importNode;\n\n  // returns true if nested templates cannot be cloned (they cannot be on\n  // some impl's like Safari 8 and Edge)\n  // OR if cloning a document fragment does not result in a document fragment\n  var needsCloning = (function() {\n    if (!needsTemplate) {\n      var t = document.createElement('template');\n      var t2 = document.createElement('template');\n      t2.content.appendChild(document.createElement('div'));\n      t.content.appendChild(t2);\n      var clone = t.cloneNode(true);\n      return (clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0\n        || !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment));\n    }\n  })();\n\n  var TEMPLATE_TAG = 'template';\n  var PolyfilledHTMLTemplateElement = function() {};\n\n  if (needsTemplate) {\n\n    var contentDoc = document.implementation.createHTMLDocument('template');\n    var canDecorate = true;\n\n    var templateStyle = document.createElement('style');\n    templateStyle.textContent = TEMPLATE_TAG + '{display:none;}';\n\n    var head = document.head;\n    head.insertBefore(templateStyle, head.firstElementChild);\n\n    /**\n      Provides a minimal shim for the <template> element.\n    */\n    PolyfilledHTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);\n\n\n    // if elements do not have `innerHTML` on instances, then\n    // templates can be patched by swizzling their prototypes.\n    var canProtoPatch =\n      !(document.createElement('div').hasOwnProperty('innerHTML'));\n\n    /**\n      The `decorate` method moves element children to the template's `content`.\n      NOTE: there is no support for dynamically adding elements to templates.\n    */\n    PolyfilledHTMLTemplateElement.decorate = function(template) {\n      // if the template is decorated, return fast\n      if (template.content) {\n        return;\n      }\n      template.content = contentDoc.createDocumentFragment();\n      var child;\n      while (child = template.firstChild) {\n        template.content.appendChild(child);\n      }\n      // NOTE: prefer prototype patching for performance and\n      // because on some browsers (IE11), re-defining `innerHTML`\n      // can result in intermittent errors.\n      if (canProtoPatch) {\n        template.__proto__ = PolyfilledHTMLTemplateElement.prototype;\n      } else {\n        template.cloneNode = function(deep) {\n          return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n        };\n        // add innerHTML to template, if possible\n        // Note: this throws on Safari 7\n        if (canDecorate) {\n          try {\n            defineInnerHTML(template);\n          } catch (err) {\n            canDecorate = false;\n          }\n        }\n      }\n      // bootstrap recursively\n      PolyfilledHTMLTemplateElement.bootstrap(template.content);\n    };\n\n    function defineInnerHTML(obj) {\n      Object.defineProperty(obj, 'innerHTML', {\n        get: function() {\n          var o = '';\n          for (var e = this.content.firstChild; e; e = e.nextSibling) {\n            o += e.outerHTML || escapeData(e.data);\n          }\n          return o;\n        },\n        set: function(text) {\n          contentDoc.body.innerHTML = text;\n          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);\n          while (this.content.firstChild) {\n            this.content.removeChild(this.content.firstChild);\n          }\n          while (contentDoc.body.firstChild) {\n            this.content.appendChild(contentDoc.body.firstChild);\n          }\n        },\n        configurable: true\n      });\n    }\n\n    defineInnerHTML(PolyfilledHTMLTemplateElement.prototype);\n\n    /**\n      The `bootstrap` method is called automatically and \"fixes\" all\n      <template> elements in the document referenced by the `doc` argument.\n    */\n    PolyfilledHTMLTemplateElement.bootstrap = function(doc) {\n      var templates = doc.querySelectorAll(TEMPLATE_TAG);\n      for (var i=0, l=templates.length, t; (i<l) && (t=templates[i]); i++) {\n        PolyfilledHTMLTemplateElement.decorate(t);\n      }\n    };\n\n    // auto-bootstrapping for main document\n    document.addEventListener('DOMContentLoaded', function() {\n      PolyfilledHTMLTemplateElement.bootstrap(document);\n    });\n\n    // Patch document.createElement to ensure newly created templates have content\n    Document.prototype.createElement = function() {\n      'use strict';\n      var el = Native_createElement.apply(this, arguments);\n      if (el.localName === 'template') {\n        PolyfilledHTMLTemplateElement.decorate(el);\n      }\n      return el;\n    };\n\n    var escapeDataRegExp = /[&\\u00A0<>]/g;\n\n    function escapeReplace(c) {\n      switch (c) {\n        case '&':\n          return '&amp;';\n        case '<':\n          return '&lt;';\n        case '>':\n          return '&gt;';\n        case '\\u00A0':\n          return '&nbsp;';\n      }\n    }\n\n    function escapeData(s) {\n      return s.replace(escapeDataRegExp, escapeReplace);\n    }\n  }\n\n  // make cloning/importing work!\n  if (needsTemplate || needsCloning) {\n\n    PolyfilledHTMLTemplateElement._cloneNode = function(template, deep) {\n      var clone = Native_cloneNode.call(template, false);\n      // NOTE: decorate doesn't auto-fix children because they are already\n      // decorated so they need special clone fixup.\n      if (this.decorate) {\n        this.decorate(clone);\n      }\n      if (deep) {\n        // NOTE: use native clone node to make sure CE's wrapped\n        // cloneNode does not cause elements to upgrade.\n        clone.content.appendChild(\n            Native_cloneNode.call(template.content, true));\n        // now ensure nested templates are cloned correctly.\n        this.fixClonedDom(clone.content, template.content);\n      }\n      return clone;\n    };\n\n    PolyfilledHTMLTemplateElement.prototype.cloneNode = function(deep) {\n      return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n    }\n\n    // Given a source and cloned 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https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8619646/\n      if (this instanceof DocumentFragment) {\n        if (!deep) {\n          return this.ownerDocument.createDocumentFragment();\n        } else {\n          dom = this.ownerDocument.importNode(this, true);\n        }\n      } else {\n        dom = Native_cloneNode.call(this, deep);\n      }\n      // template.content is cloned iff `deep`.\n      if (deep) {\n        PolyfilledHTMLTemplateElement.fixClonedDom(dom, this);\n      }\n      return dom;\n    };\n\n    // NOTE: we are cloning instead of importing <template>'s.\n    // However, the ownerDocument of the cloned template will be correct!\n    // This is because the native import node creates the right document owned\n    // subtree and `fixClonedDom` inserts cloned templates into this subtree,\n    // thus updating the owner doc.\n    Document.prototype.importNode = function(element, deep) {\n      if (element.localName === TEMPLATE_TAG) {\n        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All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function() {\n\n  'use strict';\n\n  // Establish scope.\n  window['WebComponents'] = window['WebComponents'] || {'flags':{}};\n\n  // loading script\n  var file = 'webcomponents-lite.js';\n  var script = document.querySelector('script[src*=\"' + file + '\"]');\n  var flagMatcher = /wc-(.+)/;\n\n  // Flags. Convert url arguments to flags\n  var flags = {};\n  if (!flags['noOpts']) {\n    // from url\n    location.search.slice(1).split('&').forEach(function(option) {\n      var parts = option.split('=');\n      var match;\n      if (parts[0] && (match = parts[0].match(flagMatcher))) {\n        flags[match[1]] = parts[1] || true;\n      }\n    });\n    // from script\n    if (script) {\n      for (var i=0, a; (a=script.attributes[i]); i++) {\n        if (a.name !== 'src') {\n          flags[a.name] = a.value || true;\n        }\n      }\n    }\n    // log flags\n    if (flags['log'] && flags['log']['split']) {\n      var parts = flags['log'].split(',');\n      flags['log'] = {};\n      parts.forEach(function(f) {\n        flags['log'][f] = true;\n      });\n    } else {\n      flags['log'] = {};\n    }\n  }\n\n  // exports\n  window['WebComponents']['flags'] = flags;\n  var forceShady = flags['shadydom'];\n  if (forceShady) {\n    window['ShadyDOM'] = window['ShadyDOM'] || {};\n    window['ShadyDOM']['force'] = forceShady;\n  }\n\n  var forceCE = flags['register'] || flags['ce'];\n  if (forceCE && window['customElements']) {\n    window['customElements']['forcePolyfill'] = forceCE;\n  }\n\n})();\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let appendChild = Element.prototype.appendChild;\nexport let insertBefore = Element.prototype.insertBefore;\nexport let removeChild = Element.prototype.removeChild;\nexport let setAttribute = Element.prototype.setAttribute;\nexport let removeAttribute = Element.prototype.removeAttribute;\nexport let cloneNode = Element.prototype.cloneNode;\nexport let importNode = Document.prototype.importNode;\nexport let addEventListener = Element.prototype.addEventListener;\nexport let removeEventListener = Element.prototype.removeEventListener;\nexport let windowAddEventListener = Window.prototype.addEventListener;\nexport let windowRemoveEventListener = Window.prototype.removeEventListener;\nexport let dispatchEvent = Element.prototype.dispatchEvent;\nexport let querySelector = Element.prototype.querySelector;\nexport let querySelectorAll = Element.prototype.querySelectorAll;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/**\n * Patches elements that interacts with ShadyDOM\n * such that tree traversal and mutation apis act like they would under\n * ShadowDOM.\n *\n * This import enables seemless interaction with ShadyDOM powered\n * custom elements, enabling better interoperation with 3rd party code,\n * libraries, and frameworks that use DOM tree manipulation apis.\n */\n\nimport * as utils from './utils.js';\nimport {flush, enqueue} from './flush.js';\nimport {observeChildren, unobserveChildren, filterMutations} from './observe-changes.js';\nimport * as nativeMethods from './native-methods.js';\nimport * as nativeTree from './native-tree.js';\nimport {patchBuiltins} from './patch-builtins.js';\nimport {patchEvents} from './patch-events.js';\nimport {ShadyRoot} from './attach-shadow.js';\n\nif (utils.settings.inUse) {\n  let ShadyDOM = {\n    // TODO(sorvell): remove when Polymer does not depend on this.\n    'inUse': utils.settings.inUse,\n    // TODO(sorvell): remove when Polymer does not depend on this\n    'patch': (node) => node,\n    'isShadyRoot': utils.isShadyRoot,\n    'enqueue': enqueue,\n    'flush': flush,\n    'settings': utils.settings,\n    'filterMutations': filterMutations,\n    'observeChildren': observeChildren,\n    'unobserveChildren': unobserveChildren,\n    'nativeMethods': nativeMethods,\n    'nativeTree': nativeTree\n  };\n\n  window['ShadyDOM'] = ShadyDOM;\n\n  // Apply patches to events...\n  patchEvents();\n  // Apply patches to builtins (e.g. Element.prototype) where applicable.\n  patchBuiltins();\n\n  window.ShadowRoot = ShadyRoot;\n}\n","/**\n * @enum {number}\n */\nconst CustomElementState = {\n  custom: 1,\n  failed: 2,\n};\n\nexport default CustomElementState;\n","import * as Utilities from './Utilities.js';\nimport CEState from './CustomElementState.js';\n\nexport default class CustomElementInternals {\n  constructor() {\n    /** @type {!Map<string, !CustomElementDefinition>} */\n    this._localNameToDefinition = new Map();\n\n    /** @type {!Map<!Function, !CustomElementDefinition>} */\n    this._constructorToDefinition = new Map();\n\n    /** @type {!Array<!function(!Node)>} */\n    this._patches = [];\n\n    /** @type {boolean} */\n    this._hasPatches = false;\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!CustomElementDefinition} definition\n   */\n  setDefinition(localName, definition) {\n    this._localNameToDefinition.set(localName, definition);\n    this._constructorToDefinition.set(definition.constructor, definition);\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!CustomElementDefinition|undefined}\n   */\n  localNameToDefinition(localName) {\n    return this._localNameToDefinition.get(localName);\n  }\n\n  /**\n   * @param {!Function} constructor\n   * @return {!CustomElementDefinition|undefined}\n   */\n  constructorToDefinition(constructor) {\n    return this._constructorToDefinition.get(constructor);\n  }\n\n  /**\n   * @param {!function(!Node)} listener\n   */\n  addPatch(listener) {\n    this._hasPatches = true;\n    this._patches.push(listener);\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patchTree(node) {\n    if (!this._hasPatches) return;\n\n    Utilities.walkDeepDescendantElements(node, element => this.patch(element));\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patch(node) {\n    if (!this._hasPatches) return;\n\n    if (node.__CE_patched) return;\n    node.__CE_patched = true;\n\n    for (let i = 0; i < this._patches.length; i++) {\n      this._patches[i](node);\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  connectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.connectedCallback(element);\n      } else {\n        this.upgradeElement(element);\n      }\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  disconnectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.disconnectedCallback(element);\n      }\n    }\n  }\n\n  /**\n   * Upgrades all uncustomized custom elements at and below a root node for\n   * which there is a definition. When custom element reaction callbacks are\n   * assumed to be called synchronously (which, by the current DOM / HTML spec\n   * definitions, they are *not*), callbacks for both elements customized\n   * synchronously by the parser and elements being upgraded occur in the same\n   * relative order.\n   *\n   * NOTE: This function, when used to simulate the construction of a tree that\n   * is already created but not customized (i.e. by the parser), does *not*\n   * prevent the element from reading the 'final' (true) state of the tree. For\n   * example, the element, during truly synchronous parsing / construction would\n   * see that it contains no children as they have not yet been inserted.\n   * However, this function does not modify the tree, the element will\n   * (incorrectly) have children. Additionally, self-modification restrictions\n   * for custom element constructors imposed by the DOM spec are *not* enforced.\n   *\n   *\n   * The following nested list shows the steps extending down from the HTML\n   * spec's parsing section that cause elements to be synchronously created and\n   * upgraded:\n   *\n   * The \"in body\" insertion mode:\n   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody\n   * - Switch on token:\n   *   .. other cases ..\n   *   -> Any other start tag\n   *      - [Insert an HTML element](below) for the token.\n   *\n   * Insert an HTML element:\n   * https://html.spec.whatwg.org/multipage/syntax.html#insert-an-html-element\n   * - Insert a foreign element for the token in the HTML namespace:\n   *   https://html.spec.whatwg.org/multipage/syntax.html#insert-a-foreign-element\n   *   - Create an element for a token:\n   *     https://html.spec.whatwg.org/multipage/syntax.html#create-an-element-for-the-token\n   *     - Will execute script flag is true?\n   *       - (Element queue pushed to the custom element reactions stack.)\n   *     - Create an element:\n   *       https://dom.spec.whatwg.org/#concept-create-element\n   *       - Sync CE flag is true?\n   *         - Constructor called.\n   *         - Self-modification restrictions enforced.\n   *       - Sync CE flag is false?\n   *         - (Upgrade reaction enqueued.)\n   *     - Attributes appended to element.\n   *       (`attributeChangedCallback` reactions enqueued.)\n   *     - Will execute script flag is true?\n   *       - (Element queue popped from the custom element reactions stack.\n   *         Reactions in the popped stack are invoked.)\n   *   - (Element queue pushed to the custom element reactions stack.)\n   *   - Insert the element:\n   *     https://dom.spec.whatwg.org/#concept-node-insert\n   *     - Shadow-including descendants are connected. During parsing\n   *       construction, there are no shadow-*excluding* descendants.\n   *       However, the constructor may have validly attached a shadow\n   *       tree to itself and added descendants to that shadow tree.\n   *       (`connectedCallback` reactions enqueued.)\n   *   - (Element queue popped from the custom element reactions stack.\n   *     Reactions in the popped stack are invoked.)\n   *\n   * @param {!Node} root\n   * @param {{\n   *   visitedImports: (!Set<!Node>|undefined),\n   *   upgrade: (!function(!Element)|undefined),\n   * }=} options\n   */\n  patchAndUpgradeTree(root, options = {}) {\n    const visitedImports = options.visitedImports || new Set();\n    const upgrade = options.upgrade || (element => this.upgradeElement(element));\n\n    const elements = [];\n\n    const gatherElements = element => {\n      if (element.localName === 'link' && element.getAttribute('rel') === 'import') {\n        // The HTML Imports polyfill sets a descendant element of the link to\n        // the `import` property, specifically this is *not* a Document.\n        const importNode = /** @type {?Node} */ (element.import);\n\n        if (importNode instanceof Node && importNode.readyState === 'complete') {\n          importNode.__CE_isImportDocument = true;\n\n          // Connected links are associated with the registry.\n          importNode.__CE_hasRegistry = true;\n        } else {\n          // If this link's import root is not available, its contents can't be\n          // walked. Wait for 'load' and walk it when it's ready.\n          element.addEventListener('load', () => {\n            const importNode = /** @type {!Node} */ (element.import);\n\n            if (importNode.__CE_documentLoadHandled) return;\n            importNode.__CE_documentLoadHandled = true;\n\n            importNode.__CE_isImportDocument = true;\n\n            // Connected links are associated with the registry.\n            importNode.__CE_hasRegistry = true;\n\n            // Clone the `visitedImports` set that was populated sync during\n            // the `patchAndUpgradeTree` call that caused this 'load' handler to\n            // be added. Then, remove *this* link's import node so that we can\n            // walk that import again, even if it was partially walked later\n            // during the same `patchAndUpgradeTree` call.\n            const clonedVisitedImports = new Set(visitedImports);\n            visitedImports.delete(importNode);\n\n            this.patchAndUpgradeTree(importNode, {visitedImports, upgrade});\n          });\n        }\n      } else {\n        elements.push(element);\n      }\n    };\n\n    // `walkDeepDescendantElements` populates (and internally checks against)\n    // `visitedImports` when traversing a loaded import.\n    Utilities.walkDeepDescendantElements(root, gatherElements, visitedImports);\n\n    if (this._hasPatches) {\n      for (let i = 0; i < elements.length; i++) {\n        this.patch(elements[i]);\n      }\n    }\n\n    for (let i = 0; i < elements.length; i++) {\n      upgrade(elements[i]);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  upgradeElement(element) {\n    const currentState = element.__CE_state;\n    if (currentState !== undefined) return;\n\n    const definition = this.localNameToDefinition(element.localName);\n    if (!definition) return;\n\n    definition.constructionStack.push(element);\n\n    const constructor = definition.constructor;\n    try {\n      try {\n        let result = new (constructor)();\n        if (result !== element) {\n          throw new Error('The custom element constructor did not produce the element being upgraded.');\n        }\n      } finally {\n        definition.constructionStack.pop();\n      }\n    } catch (e) {\n      element.__CE_state = CEState.failed;\n      throw e;\n    }\n\n    element.__CE_state = CEState.custom;\n    element.__CE_definition = definition;\n\n    if (definition.attributeChangedCallback) {\n      const observedAttributes = definition.observedAttributes;\n      for (let i = 0; i < observedAttributes.length; i++) {\n        const name = observedAttributes[i];\n        const value = element.getAttribute(name);\n        if (value !== null) {\n          this.attributeChangedCallback(element, name, null, value, null);\n        }\n      }\n    }\n\n    if (Utilities.isConnected(element)) {\n      this.connectedCallback(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  connectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.connectedCallback) {\n      definition.connectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  disconnectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.disconnectedCallback) {\n      definition.disconnectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   * @param {string} name\n   * @param {?string} oldValue\n   * @param {?string} newValue\n   * @param {?string} namespace\n   */\n  attributeChangedCallback(element, name, oldValue, newValue, namespace) {\n    const definition = element.__CE_definition;\n    if (\n      definition.attributeChangedCallback &&\n      definition.observedAttributes.indexOf(name) > -1\n    ) {\n      definition.attributeChangedCallback.call(element, name, oldValue, newValue, namespace);\n    }\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\n\nexport default class DocumentConstructionObserver {\n  constructor(internals, doc) {\n    /**\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @type {!Document}\n     */\n    this._document = doc;\n\n    /**\n     * @type {MutationObserver|undefined}\n     */\n    this._observer = undefined;\n\n\n    // Simulate tree construction for all currently accessible nodes in the\n    // document.\n    this._internals.patchAndUpgradeTree(this._document);\n\n    if (this._document.readyState === 'loading') {\n      this._observer = new MutationObserver(this._handleMutations.bind(this));\n\n      // Nodes created by the parser are given to the observer *before* the next\n      // task runs. Inline scripts are run in a new task. This means that the\n      // observer will be able to handle the newly parsed nodes before the inline\n      // script is run.\n      this._observer.observe(this._document, {\n        childList: true,\n        subtree: true,\n      });\n    }\n  }\n\n  disconnect() {\n    if (this._observer) {\n      this._observer.disconnect();\n    }\n  }\n\n  /**\n   * @param {!Array<!MutationRecord>} mutations\n   */\n  _handleMutations(mutations) {\n    // Once the document's `readyState` is 'interactive' or 'complete', all new\n    // nodes created within that document will be the result of script and\n    // should be handled by patching.\n    const readyState = this._document.readyState;\n    if (readyState === 'interactive' || readyState === 'complete') {\n      this.disconnect();\n    }\n\n    for (let i = 0; i < mutations.length; i++) {\n      const addedNodes = mutations[i].addedNodes;\n      for (let j = 0; j < addedNodes.length; j++) {\n        const node = addedNodes[j];\n        this._internals.patchAndUpgradeTree(node);\n      }\n    }\n  }\n}\n","/**\n * @template T\n */\nexport default class Deferred {\n  constructor() {\n    /**\n     * @private\n     * @type {T|undefined}\n     */\n    this._value = undefined;\n\n    /**\n     * @private\n     * @type {Function|undefined}\n     */\n    this._resolve = undefined;\n\n    /**\n     * @private\n     * @type {!Promise<T>}\n     */\n    this._promise = new Promise(resolve => {\n      this._resolve = resolve;\n\n      if (this._value) {\n        resolve(this._value);\n      }\n    });\n  }\n\n  /**\n   * @param {T} value\n   */\n  resolve(value) {\n    if (this._value) {\n      throw new Error('Already resolved.');\n    }\n\n    this._value = value;\n\n    if (this._resolve) {\n      this._resolve(value);\n    }\n  }\n\n  /**\n   * @return {!Promise<T>}\n   */\n  toPromise() {\n    return this._promise;\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\nimport DocumentConstructionObserver from './DocumentConstructionObserver.js';\nimport Deferred from './Deferred.js';\nimport * as Utilities from './Utilities.js';\n\n/**\n * @unrestricted\n */\nexport default class CustomElementRegistry {\n\n  /**\n   * @param {!CustomElementInternals} internals\n   */\n  constructor(internals) {\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._elementDefinitionIsRunning = false;\n\n    /**\n     * @private\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @private\n     * @type {!Map<string, !Deferred<undefined>>}\n     */\n    this._whenDefinedDeferred = new Map();\n\n    /**\n     * The default flush callback triggers the document walk synchronously.\n     * @private\n     * @type {!Function}\n     */\n    this._flushCallback = fn => fn();\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._flushPending = false;\n\n    /**\n     * @private\n     * @type {!Array<!CustomElementDefinition>}\n     */\n    this._pendingDefinitions = [];\n\n    /**\n     * @private\n     * @type {!DocumentConstructionObserver}\n     */\n    this._documentConstructionObserver = new DocumentConstructionObserver(internals, document);\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!Function} constructor\n   */\n  define(localName, constructor) {\n    if (!(constructor instanceof Function)) {\n      throw new TypeError('Custom element constructors must be functions.');\n    }\n\n    if (!Utilities.isValidCustomElementName(localName)) {\n      throw new SyntaxError(`The element name '${localName}' is not valid.`);\n    }\n\n    if (this._internals.localNameToDefinition(localName)) {\n      throw new Error(`A custom element with name '${localName}' has already been defined.`);\n    }\n\n    if (this._elementDefinitionIsRunning) {\n      throw new Error('A custom element is already being defined.');\n    }\n    this._elementDefinitionIsRunning = true;\n\n    let connectedCallback;\n    let disconnectedCallback;\n    let adoptedCallback;\n    let attributeChangedCallback;\n    let observedAttributes;\n    try {\n      /** @type {!Object} */\n      const prototype = constructor.prototype;\n      if (!(prototype instanceof Object)) {\n        throw new TypeError('The custom element constructor\\'s prototype is not an object.');\n      }\n\n      function getCallback(name) {\n        const callbackValue = prototype[name];\n        if (callbackValue !== undefined && !(callbackValue instanceof Function)) {\n          throw new Error(`The '${name}' callback must be a function.`);\n        }\n        return callbackValue;\n      }\n\n      connectedCallback = getCallback('connectedCallback');\n      disconnectedCallback = getCallback('disconnectedCallback');\n      adoptedCallback = getCallback('adoptedCallback');\n      attributeChangedCallback = getCallback('attributeChangedCallback');\n      observedAttributes = constructor['observedAttributes'] || [];\n    } catch (e) {\n      return;\n    } finally {\n      this._elementDefinitionIsRunning = false;\n    }\n\n    const definition = {\n      localName,\n      constructor,\n      connectedCallback,\n      disconnectedCallback,\n      adoptedCallback,\n      attributeChangedCallback,\n      observedAttributes,\n      constructionStack: [],\n    };\n\n    this._pendingDefinitions.push(definition);\n\n    // If we've already called the flush callback and it hasn't called back yet,\n    // don't call it again.\n    if (!this._flushPending) {\n      this._flushPending = true;\n      this._flushCallback(() => this._flush());\n    }\n  }\n\n  _flush() {\n    // If no new definitions were defined, don't attempt to flush. This could\n    // happen if a flush callback keeps the function it is given and calls it\n    // multiple times.\n    if (this._flushPending === false) return;\n    this._flushPending = false;\n\n    const pendingDefinitions = this._pendingDefinitions;\n    /** @type {!Map<string, !Array<!Element>>} */\n    const localNameToUpgradableElements = new Map();\n    for (let i = 0; i < pendingDefinitions.length; i++) {\n      localNameToUpgradableElements.set(pendingDefinitions[i].localName, []);\n    }\n\n    this._internals.patchAndUpgradeTree(document, {\n      upgrade: element => {\n        // Attempt to upgrade using *non-pending* definitions.\n        this._internals.upgradeElement(element);\n\n        // If the element was upgraded, then no pending definition applies to it.\n        if (element.__CE_state !== undefined) return;\n\n        // If there is an applicable pending definition for the element, add the\n        // element to the set of upgradable elements for that definition.\n        let upgradableElements = localNameToUpgradableElements.get(element.localName);\n        if (upgradableElements) {\n          upgradableElements.push(element);\n        }\n      },\n    });\n\n    while (pendingDefinitions.length > 0) {\n      const definition = pendingDefinitions.shift();\n      const localName = definition.localName;\n\n      this._internals.setDefinition(localName, definition);\n\n      // Attempt to upgrade all applicable elements.\n      const upgradableElements = localNameToUpgradableElements.get(definition.localName);\n      for (let i = 0; i < upgradableElements.length; i++) {\n        this._internals.upgradeElement(upgradableElements[i]);\n      }\n\n      // Resolve any promises created by `whenDefined` for the definition.\n      const deferred = this._whenDefinedDeferred.get(localName);\n      if (deferred) {\n        deferred.resolve(undefined);\n      }\n    }\n  }\n\n  /**\n   * @param {string} localName\n   * @return {Function|undefined}\n   */\n  get(localName) {\n    const definition = this._internals.localNameToDefinition(localName);\n    if (definition) {\n      return definition.constructor;\n    }\n\n    return undefined;\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!Promise<undefined>}\n   */\n  whenDefined(localName) {\n    if (!Utilities.isValidCustomElementName(localName)) {\n      return Promise.reject(new SyntaxError(`'${localName}' is not a valid custom element name.`));\n    }\n\n    const prior = this._whenDefinedDeferred.get(localName);\n    if (prior) {\n      return prior.toPromise();\n    }\n\n    const deferred = new Deferred();\n    this._whenDefinedDeferred.set(localName, deferred);\n\n    const definition = this._internals.localNameToDefinition(localName);\n    // Resolve immediately only if the given local name has a definition *and*\n    // the full document walk to upgrade elements with that local name has\n    // already happened.\n    if (definition && !this._pendingDefinitions.some(d => d.localName === localName)) {\n      deferred.resolve(undefined);\n    }\n\n    return deferred.toPromise();\n  }\n\n  polyfillWrapFlushCallback(outer) {\n    this._documentConstructionObserver.disconnect();\n    const inner = this._flushCallback;\n    this._flushCallback = flush => outer(() => inner(flush));\n  }\n}\n\n// Closure compiler exports.\nwindow['CustomElementRegistry'] = CustomElementRegistry;\nCustomElementRegistry.prototype['define'] = CustomElementRegistry.prototype.define;\nCustomElementRegistry.prototype['get'] = CustomElementRegistry.prototype.get;\nCustomElementRegistry.prototype['whenDefined'] = CustomElementRegistry.prototype.whenDefined;\nCustomElementRegistry.prototype['polyfillWrapFlushCallback'] = CustomElementRegistry.prototype.polyfillWrapFlushCallback;\n","export default {\n  Document_createElement: window.Document.prototype.createElement,\n  Document_createElementNS: window.Document.prototype.createElementNS,\n  Document_importNode: window.Document.prototype.importNode,\n  Document_prepend: window.Document.prototype['prepend'],\n  Document_append: window.Document.prototype['append'],\n  Node_cloneNode: window.Node.prototype.cloneNode,\n  Node_appendChild: window.Node.prototype.appendChild,\n  Node_insertBefore: window.Node.prototype.insertBefore,\n  Node_removeChild: window.Node.prototype.removeChild,\n  Node_replaceChild: window.Node.prototype.replaceChild,\n  Node_textContent: Object.getOwnPropertyDescriptor(window.Node.prototype, 'textContent'),\n  Element_attachShadow: window.Element.prototype['attachShadow'],\n  Element_innerHTML: Object.getOwnPropertyDescriptor(window.Element.prototype, 'innerHTML'),\n  Element_getAttribute: window.Element.prototype.getAttribute,\n  Element_setAttribute: window.Element.prototype.setAttribute,\n  Element_removeAttribute: window.Element.prototype.removeAttribute,\n  Element_getAttributeNS: window.Element.prototype.getAttributeNS,\n  Element_setAttributeNS: window.Element.prototype.setAttributeNS,\n  Element_removeAttributeNS: window.Element.prototype.removeAttributeNS,\n  Element_insertAdjacentElement: window.Element.prototype['insertAdjacentElement'],\n  Element_prepend: window.Element.prototype['prepend'],\n  Element_append: window.Element.prototype['append'],\n  Element_before: window.Element.prototype['before'],\n  Element_after: window.Element.prototype['after'],\n  Element_replaceWith: window.Element.prototype['replaceWith'],\n  Element_remove: window.Element.prototype['remove'],\n  HTMLElement: window.HTMLElement,\n  HTMLElement_innerHTML: Object.getOwnPropertyDescriptor(window.HTMLElement.prototype, 'innerHTML'),\n  HTMLElement_insertAdjacentElement: window.HTMLElement.prototype['insertAdjacentElement'],\n};\n","/**\n * This class exists only to work around Closure's lack of a way to describe\n * singletons. It represents the 'already constructed marker' used in custom\n * element construction stacks.\n *\n * https://html.spec.whatwg.org/#concept-already-constructed-marker\n */\nclass AlreadyConstructedMarker {}\n\nexport default new AlreadyConstructedMarker();\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   prepend: !function(...(!Node|string)),\n  *  append: !function(...(!Node|string)),\n * }}\n */\nlet ParentNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ParentNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['prepend'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.prepend.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['append'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.append.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   before: !function(...(!Node|string)),\n *   after: !function(...(!Node|string)),\n *   replaceWith: !function(...(!Node|string)),\n *   remove: !function(),\n * }}\n */\nlet ChildNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ChildNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['before'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.before.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['after'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    builtIn.after.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (Utilities.isConnected(this)) {\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  /**\n   * @param {...(!Node|string)} nodes\n   */\n  destination['replaceWith'] = function(...nodes) {\n    // TODO: Fix this for when one of `nodes` is a DocumentFragment!\n    const connectedBefore = /** @type {!Array<!Node>} */ (nodes.filter(node => {\n      // DocumentFragments are not connected and will not be added to the list.\n      return node instanceof Node && Utilities.isConnected(node);\n    }));\n\n    const wasConnected = Utilities.isConnected(this);\n\n    builtIn.replaceWith.apply(this, nodes);\n\n    for (let i = 0; i < connectedBefore.length; i++) {\n      internals.disconnectTree(connectedBefore[i]);\n    }\n\n    if (wasConnected) {\n      internals.disconnectTree(this);\n      for (let i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n        if (node instanceof Element) {\n          internals.connectTree(node);\n        }\n      }\n    }\n  };\n\n  destination['remove'] = function() {\n    const wasConnected = Utilities.isConnected(this);\n\n    builtIn.remove.call(this);\n\n    if (wasConnected) {\n      internals.disconnectTree(this);\n    }\n  };\n};\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\nimport CustomElementInternals from './CustomElementInternals.js';\nimport CustomElementRegistry from './CustomElementRegistry.js';\n\nimport PatchHTMLElement from './Patch/HTMLElement.js';\nimport PatchDocument from './Patch/Document.js';\nimport PatchNode from './Patch/Node.js';\nimport PatchElement from './Patch/Element.js';\n\nconst priorCustomElements = window['customElements'];\n\nif (!priorCustomElements ||\n     priorCustomElements['forcePolyfill'] ||\n     (typeof priorCustomElements['define'] != 'function') ||\n     (typeof priorCustomElements['get'] != 'function')) {\n  /** @type {!CustomElementInternals} */\n  const internals = new CustomElementInternals();\n\n  PatchHTMLElement(internals);\n  PatchDocument(internals);\n  PatchNode(internals);\n  PatchElement(internals);\n\n  // The main document is always associated with the registry.\n  document.__CE_hasRegistry = true;\n\n  /** @type {!CustomElementRegistry} */\n  const customElements = new CustomElementRegistry(internals);\n\n  Object.defineProperty(window, 'customElements', {\n    configurable: true,\n    enumerable: true,\n    value: customElements,\n  });\n}\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport AlreadyConstructedMarker from '../AlreadyConstructedMarker.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  window['HTMLElement'] = (function() {\n    /**\n     * @type {function(new: HTMLElement): !HTMLElement}\n     */\n    function HTMLElement() {\n      // This should really be `new.target` but `new.target` can't be emulated\n      // in ES5. Assuming the user keeps the default value of the constructor's\n      // prototype's `constructor` property, this is equivalent.\n      /** @type {!Function} */\n      const constructor = this.constructor;\n\n      const definition = internals.constructorToDefinition(constructor);\n      if (!definition) {\n        throw new Error('The custom element being constructed was not registered with `customElements`.');\n      }\n\n      const constructionStack = definition.constructionStack;\n\n      if (constructionStack.length === 0) {\n        const element = Native.Document_createElement.call(document, definition.localName);\n        Object.setPrototypeOf(element, constructor.prototype);\n        element.__CE_state = CEState.custom;\n        element.__CE_definition = definition;\n        internals.patch(element);\n        return element;\n      }\n\n      const lastIndex = constructionStack.length - 1;\n      const element = constructionStack[lastIndex];\n      if (element === AlreadyConstructedMarker) {\n        throw new Error('The HTMLElement constructor was either called reentrantly for this constructor or called multiple times.');\n      }\n      constructionStack[lastIndex] = AlreadyConstructedMarker;\n\n      Object.setPrototypeOf(element, constructor.prototype);\n      internals.patch(/** @type {!HTMLElement} */ (element));\n\n      return element;\n    }\n\n    HTMLElement.prototype = Native.HTMLElement.prototype;\n\n    return HTMLElement;\n  })();\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElement',\n    /**\n     * @this {Document}\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElement.call(this, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'importNode',\n    /**\n     * @this {Document}\n     * @param {!Node} node\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(node, deep) {\n      const clone = Native.Document_importNode.call(this, node, deep);\n      // Only create custom elements if this document is associated with the registry.\n      if (!this.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  const NS_HTML = \"http://www.w3.org/1999/xhtml\";\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElementNS',\n    /**\n     * @this {Document}\n     * @param {?string} namespace\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(namespace, localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry && (namespace === null || namespace === NS_HTML)) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElementNS.call(this, namespace, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  PatchParentNode(internals, Document.prototype, {\n    prepend: Native.Document_prepend,\n    append: Native.Document_append,\n  });\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  // `Node#nodeValue` is implemented on `Attr`.\n  // `Node#textContent` is implemented on `Attr`, `Element`.\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'insertBefore',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @param {?Node} refNode\n     * @return {!Node}\n     */\n    function(node, refNode) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'appendChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_appendChild.call(this, node);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_appendChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'cloneNode',\n    /**\n     * @this {Node}\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(deep) {\n      const clone = Native.Node_cloneNode.call(this, deep);\n      // Only create custom elements if this element's owner document is\n      // associated with the registry.\n      if (!this.ownerDocument.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'removeChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_removeChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'replaceChild',\n    /**\n     * @this {Node}\n     * @param {!Node} nodeToInsert\n     * @param {!Node} nodeToRemove\n     * @return {!Node}\n     */\n    function(nodeToInsert, nodeToRemove) {\n      if (nodeToInsert instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(nodeToInsert.childNodes);\n        const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          internals.disconnectTree(nodeToRemove);\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeToInsertWasConnected = Utilities.isConnected(nodeToInsert);\n      const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n      const thisIsConnected = Utilities.isConnected(this);\n\n      if (thisIsConnected) {\n        internals.disconnectTree(nodeToRemove);\n      }\n\n      if (nodeToInsertWasConnected) {\n        internals.disconnectTree(nodeToInsert);\n      }\n\n      if (thisIsConnected) {\n        internals.connectTree(nodeToInsert);\n      }\n\n      return nativeResult;\n    });\n\n\n  function patch_textContent(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'textContent', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Node} */ function(assignedValue) {\n        // If this is a text node then there are no nodes to disconnect.\n        if (this.nodeType === Node.TEXT_NODE) {\n          baseDescriptor.set.call(this, assignedValue);\n          return;\n        }\n\n        let removedNodes = undefined;\n        // Checking for `firstChild` is faster than reading `childNodes.length`\n        // to compare with 0.\n        if (this.firstChild) {\n          // Using `childNodes` is faster than `children`, even though we only\n          // care about elements.\n          const childNodes = this.childNodes;\n          const childNodesLength = childNodes.length;\n          if (childNodesLength > 0 && Utilities.isConnected(this)) {\n            // Copying an array by iterating is faster than using slice.\n            removedNodes = new Array(childNodesLength);\n            for (let i = 0; i < childNodesLength; i++) {\n              removedNodes[i] = childNodes[i];\n            }\n          }\n        }\n\n        baseDescriptor.set.call(this, assignedValue);\n\n        if (removedNodes) {\n          for (let i = 0; i < removedNodes.length; i++) {\n            internals.disconnectTree(removedNodes[i]);\n          }\n        }\n      },\n    });\n  }\n\n  if (Native.Node_textContent && Native.Node_textContent.get) {\n    patch_textContent(Node.prototype, Native.Node_textContent);\n  } else {\n    internals.addPatch(function(element) {\n      patch_textContent(element, {\n        enumerable: true,\n        configurable: true,\n        // NOTE: This implementation of the `textContent` getter assumes that\n        // text nodes' `textContent` getter will not be patched.\n        get: /** @this {Node} */ function() {\n          /** @type {!Array<string>} */\n          const parts = [];\n\n          for (let i = 0; i < this.childNodes.length; i++) {\n            parts.push(this.childNodes[i].textContent);\n          }\n\n          return parts.join('');\n        },\n        set: /** @this {Node} */ function(assignedValue) {\n          while (this.firstChild) {\n            Native.Node_removeChild.call(this, this.firstChild);\n          }\n          Native.Node_appendChild.call(this, document.createTextNode(assignedValue));\n        },\n      });\n    });\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\nimport PatchChildNode from './Interface/ChildNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  if (Native.Element_attachShadow) {\n    Utilities.setPropertyUnchecked(Element.prototype, 'attachShadow',\n      /**\n       * @this {Element}\n       * @param {!{mode: string}} init\n       * @return {ShadowRoot}\n       */\n      function(init) {\n        const shadowRoot = Native.Element_attachShadow.call(this, init);\n        this.__CE_shadowRoot = shadowRoot;\n        return shadowRoot;\n      });\n  } else {\n    console.warn('Custom Elements: `Element#attachShadow` was not patched.');\n  }\n\n\n  function patch_innerHTML(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'innerHTML', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Element} */ function(htmlString) {\n        const isConnected = Utilities.isConnected(this);\n\n        // NOTE: In IE11, when using the native `innerHTML` setter, all nodes\n        // that were previously descendants of the context element have all of\n        // their children removed as part of the set - the entire subtree is\n        // 'disassembled'. This work around walks the subtree *before* using the\n        // native setter.\n        /** @type {!Array<!Element>|undefined} */\n        let removedElements = undefined;\n        if (isConnected) {\n          removedElements = [];\n          Utilities.walkDeepDescendantElements(this, element => {\n            if (element !== this) {\n              removedElements.push(element);\n            }\n          });\n        }\n\n        baseDescriptor.set.call(this, htmlString);\n\n        if (removedElements) {\n          for (let i = 0; i < removedElements.length; i++) {\n            const element = removedElements[i];\n            if (element.__CE_state === CEState.custom) {\n              internals.disconnectedCallback(element);\n            }\n          }\n        }\n\n        // Only create custom elements if this element's owner document is\n        // associated with the registry.\n        if (!this.ownerDocument.__CE_hasRegistry) {\n          internals.patchTree(this);\n        } else {\n          internals.patchAndUpgradeTree(this);\n        }\n        return htmlString;\n      },\n    });\n  }\n\n  if (Native.Element_innerHTML && Native.Element_innerHTML.get) {\n    patch_innerHTML(Element.prototype, Native.Element_innerHTML);\n  } else if (Native.HTMLElement_innerHTML && Native.HTMLElement_innerHTML.get) {\n    patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);\n  } else {\n\n    /** @type {HTMLDivElement} */\n    const rawDiv = Native.Document_createElement.call(document, 'div');\n\n    internals.addPatch(function(element) {\n      patch_innerHTML(element, {\n        enumerable: true,\n        configurable: true,\n        // Implements getting `innerHTML` by performing an unpatched `cloneNode`\n        // of the element and returning the resulting element's `innerHTML`.\n        // TODO: Is this too expensive?\n        get: /** @this {Element} */ function() {\n          return Native.Node_cloneNode.call(this, true).innerHTML;\n        },\n        // Implements setting `innerHTML` by creating an unpatched element,\n        // setting `innerHTML` of that element and replacing the target\n        // element's children with those of the unpatched element.\n        set: /** @this {Element} */ function(assignedValue) {\n          // NOTE: re-route to `content` for `template` elements.\n          // We need to do this because `template.appendChild` does not\n          // route into `template.content`.\n          /** @type {!Node} */\n          const content = this.localName === 'template' ? (/** @type {!HTMLTemplateElement} */ (this)).content : this;\n          rawDiv.innerHTML = assignedValue;\n\n          while (content.childNodes.length > 0) {\n            Native.Node_removeChild.call(content, content.childNodes[0]);\n          }\n          while (rawDiv.childNodes.length > 0) {\n            Native.Node_appendChild.call(content, rawDiv.childNodes[0]);\n          }\n        },\n      });\n    });\n  }\n\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttribute.call(this, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_setAttribute.call(this, name, newValue);\n      newValue = Native.Element_getAttribute.call(this, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, null);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(namespace, name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     */\n    function(name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttribute.call(this, name);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_removeAttribute.call(this, name);\n      if (oldValue !== null) {\n        internals.attributeChangedCallback(this, name, oldValue, null, null);\n      }\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     */\n    function(namespace, name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttributeNS.call(this, namespace, name);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_removeAttributeNS.call(this, namespace, name);\n      // In older browsers, `Element#getAttributeNS` may return the empty string\n      // instead of null if the attribute does not exist. For details, see;\n      // https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes\n      const newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      if (oldValue !== newValue) {\n        internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n      }\n    });\n\n\n  function patch_insertAdjacentElement(destination, baseMethod) {\n    Utilities.setPropertyUnchecked(destination, 'insertAdjacentElement',\n      /**\n       * @this {Element}\n       * @param {string} where\n       * @param {!Element} element\n       * @return {?Element}\n       */\n      function(where, element) {\n        const wasConnected = Utilities.isConnected(element);\n        const insertedElement = /** @type {!Element} */\n          (baseMethod.call(this, where, element));\n\n        if (wasConnected) {\n          internals.disconnectTree(element);\n        }\n\n        if (Utilities.isConnected(insertedElement)) {\n          internals.connectTree(element);\n        }\n        return insertedElement;\n      });\n  }\n\n  if (Native.HTMLElement_insertAdjacentElement) {\n    patch_insertAdjacentElement(HTMLElement.prototype, Native.HTMLElement_insertAdjacentElement);\n  } else if (Native.Element_insertAdjacentElement) {\n    patch_insertAdjacentElement(Element.prototype, Native.Element_insertAdjacentElement);\n  } else {\n    console.warn('Custom Elements: `Element#insertAdjacentElement` was not patched.');\n  }\n\n\n  PatchParentNode(internals, Element.prototype, {\n    prepend: Native.Element_prepend,\n    append: Native.Element_append,\n  });\n\n  PatchChildNode(internals, Element.prototype, {\n    before: Native.Element_before,\n    after: Native.Element_after,\n    replaceWith: Native.Element_replaceWith,\n    remove: Native.Element_remove,\n  });\n};\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport const VAR_ASSIGN = /(?:^|[;\\s{]\\s*)(--[\\w-]*?)\\s*:\\s*(?:((?:'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\([^)]*?\\)|[^};{])+)|\\{([^}]*)\\}(?:(?=[;\\s}])|$))/gi;\nexport const MIXIN_MATCH = /(?:^|\\W+)@apply\\s*\\(?([^);\\n]*)\\)?/gi;\nexport const VAR_CONSUMED = /(--[\\w-]+)\\s*([:,;)]|$)/gi;\nexport const ANIMATION_MATCH = /(animation\\s*:)|(animation-name\\s*:)/;\nexport const MEDIA_MATCH = /@media\\s(.*)/;\nexport const IS_VAR = /^--/;\nexport const BRACKETED = /\\{[^}]*\\}/g;\nexport const HOST_PREFIX = '(?:^|[^.#[:])';\nexport const HOST_SUFFIX = '($|[.:[\\\\s>+~])';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\nimport * as StyleUtil from './style-util.js'\nimport {nativeShadow} from './style-settings.js'\n\n/* Transforms ShadowDOM styling into ShadyDOM styling\n\n* scoping:\n\n  * elements in scope get scoping selector class=\"x-foo-scope\"\n  * selectors re-written as follows:\n\n    div button -> div.x-foo-scope button.x-foo-scope\n\n* :host -> scopeName\n\n* :host(...) -> scopeName...\n\n* ::slotted(...) -> scopeName > ...\n\n* ...:dir(ltr|rtl) -> [dir=\"ltr|rtl\"] ..., ...[dir=\"ltr|rtl\"]\n\n* :host(:dir[rtl]) -> scopeName:dir(rtl) -> [dir=\"rtl\"] scopeName, scopeName[dir=\"rtl\"]\n\n*/\nconst SCOPE_NAME = 'style-scope';\n\nclass StyleTransformer {\n  get SCOPE_NAME() {\n    return SCOPE_NAME;\n  }\n  // Given a node and scope name, add a scoping class to each node\n  // in the tree. This facilitates transforming css into scoped rules.\n  dom(node, scope, shouldRemoveScope) {\n    // one time optimization to skip scoping...\n    if (node['__styleScoped']) {\n      node['__styleScoped'] = null;\n    } else {\n      this._transformDom(node, scope || '', shouldRemoveScope);\n    }\n  }\n\n  _transformDom(node, selector, shouldRemoveScope) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      this.element(node, selector, shouldRemoveScope);\n    }\n    let c$ = (node.localName === 'template') ?\n      (node.content || node._content).childNodes :\n      node.children || node.childNodes;\n    if (c$) {\n      for (let i=0; i<c$.length; i++) {\n        this._transformDom(c$[i], selector, shouldRemoveScope);\n      }\n    }\n  }\n\n  element(element, scope, shouldRemoveScope) {\n    // note: if using classes, we add both the general 'style-scope' class\n    // as well as the specific scope. This enables easy filtering of all\n    // `style-scope` elements\n    if (scope) {\n      // note: svg on IE does not have classList so fallback to class\n      if (element.classList) {\n        if (shouldRemoveScope) {\n          element.classList.remove(SCOPE_NAME);\n          element.classList.remove(scope);\n        } else {\n          element.classList.add(SCOPE_NAME);\n          element.classList.add(scope);\n        }\n      } else if (element.getAttribute) {\n        let c = element.getAttribute(CLASS);\n        if (shouldRemoveScope) {\n          if (c) {\n            let newValue = c.replace(SCOPE_NAME, '').replace(scope, '');\n            StyleUtil.setElementClassRaw(element, newValue);\n          }\n        } else {\n          let newValue = (c ? c + ' ' : '') + SCOPE_NAME + ' ' + scope;\n          StyleUtil.setElementClassRaw(element, newValue);\n        }\n      }\n    }\n  }\n\n  elementStyles(element, styleRules, callback) {\n    let cssBuildType = element['__cssBuild'];\n    // no need to shim selectors if settings.useNativeShadow, also\n    // a shady css build will already have transformed selectors\n    // NOTE: This method may be called as part of static or property shimming.\n    // When there is a targeted build it will not be called for static shimming,\n    // but when the property shim is used it is called and should opt out of\n    // static shimming work when a proper build exists.\n    let cssText = '';\n    if (nativeShadow || cssBuildType === 'shady') {\n      cssText = StyleUtil.toCssText(styleRules, callback);\n    } else {\n      let {is, typeExtension} = StyleUtil.getIsExtends(element);\n      cssText = this.css(styleRules, is, typeExtension, callback) + '\\n\\n';\n    }\n    return cssText.trim();\n  }\n\n  // Given a string of cssText and a scoping string (scope), returns\n  // a string of scoped css where each selector is transformed to include\n  // a class created from the scope. ShadowDOM selectors are also transformed\n  // (e.g. :host) to use the scoping selector.\n  css(rules, scope, ext, callback) {\n    let hostScope = this._calcHostScope(scope, ext);\n    scope = this._calcElementScope(scope);\n    let self = this;\n    return StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      if (!rule.isScoped) {\n        self.rule(rule, scope, hostScope);\n        rule.isScoped = true;\n      }\n      if (callback) {\n        callback(rule, scope, hostScope);\n      }\n    });\n  }\n\n  _calcElementScope(scope) {\n    if (scope) {\n      return CSS_CLASS_PREFIX + scope;\n    } else {\n      return '';\n    }\n  }\n\n  _calcHostScope(scope, ext) {\n    return ext ? `[is=${scope}]` : scope;\n  }\n\n  rule(rule, scope, hostScope) {\n    this._transformRule(rule, this._transformComplexSelector,\n      scope, hostScope);\n  }\n\n  /**\n   * transforms a css rule to a scoped rule.\n   *\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRule(rule, transformer, scope, hostScope) {\n    // NOTE: save transformedSelector for subsequent matching of elements\n    // against selectors (e.g. when calculating style properties)\n    rule['selector'] = rule.transformedSelector =\n      this._transformRuleCss(rule, transformer, scope, hostScope);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRuleCss(rule, transformer, scope, hostScope) {\n    let p$ = rule['selector'].split(COMPLEX_SELECTOR_SEP);\n    // we want to skip transformation of rules that appear in keyframes,\n    // because they are keyframe selectors, not element selectors.\n    if (!StyleUtil.isKeyframesSelector(rule)) {\n      for (let i=0, l=p$.length, p; (i<l) && (p=p$[i]); i++) {\n        p$[i] = transformer.call(this, p, scope, hostScope);\n      }\n    }\n    return p$.join(COMPLEX_SELECTOR_SEP);\n  }\n\n/**\n * @param {string} selector\n * @param {string} scope\n * @param {string=} hostScope\n */\n  _transformComplexSelector(selector, scope, hostScope) {\n    let stop = false;\n    selector = selector.trim();\n    // Remove spaces inside of selectors like `:nth-of-type` because it confuses SIMPLE_SELECTOR_SEP\n    selector = selector.replace(NTH, (m, type, inner) => `:${type}(${inner.replace(/\\s/g, '')})`);\n    selector = selector.replace(SLOTTED_START, `${HOST} $1`);\n    selector = selector.replace(SIMPLE_SELECTOR_SEP, (m, c, s) => {\n      if (!stop) {\n        let info = this._transformCompoundSelector(s, c, scope, hostScope);\n        stop = stop || info.stop;\n        c = info.combinator;\n        s = info.value;\n      }\n      return c + s;\n    });\n    return selector;\n  }\n\n  _transformCompoundSelector(selector, combinator, scope, hostScope) {\n    // replace :host with host scoping class\n    let slottedIndex = selector.indexOf(SLOTTED);\n    if (selector.indexOf(HOST) >= 0) {\n      selector = this._transformHostSelector(selector, hostScope);\n    // replace other selectors with scoping class\n    } else if (slottedIndex !== 0) {\n      selector = scope ? this._transformSimpleSelector(selector, scope) :\n        selector;\n    }\n    // mark ::slotted() scope jump to replace with descendant selector + arg\n    // also ignore left-side combinator\n    let slotted = false;\n    if (slottedIndex >= 0) {\n      combinator = '';\n      slotted = true;\n    }\n    // process scope jumping selectors up to the scope jump and then stop\n    let stop;\n    if (slotted) {\n      stop = true;\n      if (slotted) {\n        // .zonk ::slotted(.foo) -> .zonk.scope > .foo\n        selector = selector.replace(SLOTTED_PAREN, (m, paren) => ` > ${paren}`);\n      }\n    }\n    selector = selector.replace(DIR_PAREN, (m, before, dir) =>\n      `[dir=\"${dir}\"] ${before}, ${before}[dir=\"${dir}\"]`);\n    return {value: selector, combinator, stop};\n  }\n\n  _transformSimpleSelector(selector, scope) {\n    let p$ = selector.split(PSEUDO_PREFIX);\n    p$[0] += scope;\n    return p$.join(PSEUDO_PREFIX);\n  }\n\n  // :host(...) -> scopeName...\n  _transformHostSelector(selector, hostScope) {\n    let m = selector.match(HOST_PAREN);\n    let paren = m && m[2].trim() || '';\n    if (paren) {\n      if (!paren[0].match(SIMPLE_SELECTOR_PREFIX)) {\n        // paren starts with a type selector\n        let typeSelector = paren.split(SIMPLE_SELECTOR_PREFIX)[0];\n        // if the type selector is our hostScope then avoid pre-pending it\n        if (typeSelector === hostScope) {\n          return paren;\n        // otherwise, this selector should not match in this scope so\n        // output a bogus selector.\n        } else {\n          return SELECTOR_NO_MATCH;\n        }\n      } else {\n        // make sure to do a replace here to catch selectors like:\n        // `:host(.foo)::before`\n        return selector.replace(HOST_PAREN, function(m, host, paren) {\n          return hostScope + paren;\n        });\n      }\n    // if no paren, do a straight :host replacement.\n    // TODO(sorvell): this should not strictly be necessary but\n    // it's needed to maintain support for `:host[foo]` type selectors\n    // which have been improperly used under Shady DOM. This should be\n    // deprecated.\n    } else {\n      return selector.replace(HOST, hostScope);\n    }\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  documentRule(rule) {\n    // reset selector in case this is redone.\n    rule['selector'] = rule['parsedSelector'];\n    this.normalizeRootSelector(rule);\n    this._transformRule(rule, this._transformDocumentSelector);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  normalizeRootSelector(rule) {\n    if (rule['selector'] === ROOT) {\n      rule['selector'] = 'html';\n    }\n  }\n\n/**\n * @param {string} selector\n */\n  _transformDocumentSelector(selector) {\n    return selector.match(SLOTTED) ?\n      this._transformComplexSelector(selector, SCOPE_DOC_SELECTOR) :\n      this._transformSimpleSelector(selector.trim(), SCOPE_DOC_SELECTOR);\n  }\n}\n\nlet NTH = /:(nth[-\\w]+)\\(([^)]+)\\)/;\nlet SCOPE_DOC_SELECTOR = `:not(.${SCOPE_NAME})`;\nlet COMPLEX_SELECTOR_SEP = ',';\nlet SIMPLE_SELECTOR_SEP = /(^|[\\s>+~]+)((?:\\[.+?\\]|[^\\s>+~=[])+)/g;\nlet SIMPLE_SELECTOR_PREFIX = /[[.:#*]/;\nlet HOST = ':host';\nlet ROOT = ':root';\nlet SLOTTED = '::slotted';\nlet SLOTTED_START = new RegExp(`^(${SLOTTED})`);\n// NOTE: this supports 1 nested () pair for things like\n// :host(:not([selected]), more general support requires\n// parsing which seems like overkill\nlet HOST_PAREN = /(:host)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\n// similar to HOST_PAREN\nlet SLOTTED_PAREN = /(?:::slotted)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\nlet DIR_PAREN = /(.*):dir\\((?:(ltr|rtl))\\)/;\nlet CSS_CLASS_PREFIX = '.';\nlet PSEUDO_PREFIX = ':';\nlet CLASS = 'class';\nlet SELECTOR_NO_MATCH = 'should_not_match';\n\nexport default new StyleTransformer()","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js' // eslint-disable-line no-unused-vars\n\n/** @const {string} */\nconst infoKey = '__styleInfo';\n\nexport default class StyleInfo {\n  /**\n   * @param {Element} node\n   * @return {StyleInfo}\n   */\n  static get(node) {\n    if (node) {\n      return node[infoKey];\n    } else {\n      return null;\n    }\n  }\n  /**\n   * @param {!Element} node\n   * @param {StyleInfo} styleInfo\n   * @return {StyleInfo}\n   */\n  static set(node, styleInfo) {\n    node[infoKey] = styleInfo;\n    return styleInfo;\n  }\n  /**\n   * @param {StyleNode} ast\n   * @param {Node=} placeholder\n   * @param {Array<string>=} ownStylePropertyNames\n   * @param {string=} elementName\n   * @param {string=} typeExtension\n   * @param {string=} cssBuild\n   */\n  constructor(ast, placeholder, ownStylePropertyNames, elementName, typeExtension, cssBuild) {\n    /** @type {StyleNode} */\n    this.styleRules = ast || null;\n    /** @type {Node} */\n    this.placeholder = placeholder || null;\n    /** @type {!Array<string>} */\n    this.ownStylePropertyNames = ownStylePropertyNames || [];\n    /** @type {Array<Object>} */\n    this.overrideStyleProperties = null;\n    /** @type {string} */\n    this.elementName = elementName || '';\n    /** @type {string} */\n    this.cssBuild = cssBuild || '';\n    /** @type {string} */\n    this.typeExtension = typeExtension || '';\n    /** @type {Object<string, string>} */\n    this.styleProperties = null;\n    /** @type {?string} */\n    this.scopeSelector = null;\n    /** @type {HTMLStyleElement} */\n    this.customStyle = null;\n  }\n  _getStyleRules() {\n    return this.styleRules;\n  }\n}\n\nStyleInfo.prototype['_getStyleRules'] = StyleInfo.prototype._getStyleRules;","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {applyStylePlaceHolder} from './style-util.js'\nimport {nativeShadow} from './style-settings.js'\n\n/** @type {Object<string, !Node>} */\nlet placeholderMap = {};\n\n/**\n * @const {CustomElementRegistry}\n */\nconst ce = window['customElements'];\nif (ce && !nativeShadow) {\n  /**\n   * @const {function(this:CustomElementRegistry, string,function(new:HTMLElement),{extends: string}=)}\n   */\n  const origDefine = ce['define'];\n  /**\n   * @param {string} name\n   * @param {function(new:HTMLElement)} clazz\n   * @param {{extends: string}=} options\n   * @return {function(new:HTMLElement)}\n   */\n  const wrappedDefine = (name, clazz, options) => {\n    placeholderMap[name] = applyStylePlaceHolder(name);\n    return origDefine.call(/** @type {!CustomElementRegistry} */(ce), name, clazz, options);\n  }\n  ce['define'] = wrappedDefine;\n}\n\nexport default placeholderMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n'use strict';\n\nexport default class StyleCache {\n  constructor(typeMax = 100) {\n    // map element name -> [{properties, styleElement, scopeSelector}]\n    this.cache = {};\n    this.typeMax = typeMax;\n  }\n\n  _validate(cacheEntry, properties, ownPropertyNames) {\n    for (let idx = 0; idx < ownPropertyNames.length; idx++) {\n      let pn = ownPropertyNames[idx];\n      if (cacheEntry.properties[pn] !== properties[pn]) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  store(tagname, properties, styleElement, scopeSelector) {\n    let list = this.cache[tagname] || [];\n    list.push({properties, styleElement, scopeSelector});\n    if (list.length > this.typeMax) {\n      list.shift();\n    }\n    this.cache[tagname] = list;\n  }\n\n  fetch(tagname, properties, ownPropertyNames) {\n    let list = this.cache[tagname];\n    if (!list) {\n      return;\n    }\n    // reverse list for most-recent lookups\n    for (let idx = list.length - 1; idx >= 0; idx--) {\n      let entry = list[idx];\n      if (this._validate(entry, properties, ownPropertyNames)) {\n        return entry;\n      }\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/**\n * @const {!Object<string, !HTMLTemplateElement>}\n */\nconst templateMap = {};\nexport default templateMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport documentWait from './document-wait.js'\n\n/**\n * @typedef {HTMLStyleElement | {getStyle: function():HTMLStyleElement}}\n */\nexport let CustomStyleProvider;\n\nconst SEEN_MARKER = '__seenByShadyCSS';\nconst CACHED_STYLE = '__shadyCSSCachedStyle';\n\n/** @type {?function(!HTMLStyleElement)} */\nlet transformFn = null;\n\n/** @type {?function()} */\nlet validateFn = null;\n\n/**\nThis interface is provided to add document-level <style> elements to ShadyCSS for processing.\nThese styles must be processed by ShadyCSS to simulate ShadowRoot upper-bound encapsulation from outside styles\nIn addition, these styles may also need to be processed for @apply rules and CSS Custom Properties\n\nTo add document-level styles to ShadyCSS, one can call `ShadyCSS.addDocumentStyle(styleElement)` or `ShadyCSS.addDocumentStyle({getStyle: () => styleElement})`\n\nIn addition, if the process used to discover document-level styles can be synchronously flushed, one should set `ShadyCSS.documentStyleFlush`.\nThis function will be called when calculating styles.\n\nAn example usage of the document-level styling api can be found in `examples/document-style-lib.js`\n\n@unrestricted\n*/\nexport default class CustomStyleInterface {\n  constructor() {\n    /** @type {!Array<!CustomStyleProvider>} */\n    this['customStyles'] = [];\n    this['enqueued'] = false;\n  }\n  /**\n   * Queue a validation for new custom styles to batch style recalculations\n   */\n  enqueueDocumentValidation() {\n    if (this['enqueued'] || !validateFn) {\n      return;\n    }\n    this['enqueued'] = true;\n    documentWait(validateFn);\n  }\n  /**\n   * @param {!HTMLStyleElement} style\n   */\n  addCustomStyle(style) {\n    if (!style[SEEN_MARKER]) {\n      style[SEEN_MARKER] = true;\n      this['customStyles'].push(style);\n      this.enqueueDocumentValidation();\n    }\n  }\n  /**\n   * @param {!CustomStyleProvider} customStyle\n   * @return {HTMLStyleElement}\n   */\n  getStyleForCustomStyle(customStyle) {\n    if (customStyle[CACHED_STYLE]) {\n      return customStyle[CACHED_STYLE];\n    }\n    let style;\n    if (customStyle['getStyle']) {\n      style = customStyle['getStyle']();\n    } else {\n      style = customStyle;\n    }\n    return style;\n  }\n  /**\n   * @return {!Array<!CustomStyleProvider>}\n   */\n  processStyles() {\n    const cs = this['customStyles'];\n    for (let i = 0; i < cs.length; i++) {\n      const customStyle = cs[i];\n      if (customStyle[CACHED_STYLE]) {\n        continue;\n      }\n      const style = this.getStyleForCustomStyle(customStyle);\n      if (style) {\n        // HTMLImports polyfill may have cloned the style into the main document,\n        // which is referenced with __appliedElement.\n        const styleToTransform = /** @type {!HTMLStyleElement} */(style['__appliedElement'] || style);\n        if (transformFn) {\n          transformFn(styleToTransform);\n        }\n        customStyle[CACHED_STYLE] = styleToTransform;\n      }\n    }\n    return cs;\n  }\n}\n\nCustomStyleInterface.prototype['addCustomStyle'] = CustomStyleInterface.prototype.addCustomStyle;\nCustomStyleInterface.prototype['getStyleForCustomStyle'] = CustomStyleInterface.prototype.getStyleForCustomStyle;\nCustomStyleInterface.prototype['processStyles'] = CustomStyleInterface.prototype.processStyles;\n\nObject.defineProperties(CustomStyleInterface.prototype, {\n  'transformCallback': {\n    /** @return {?function(!HTMLStyleElement)} */\n    get() {\n      return transformFn;\n    },\n    /** @param {?function(!HTMLStyleElement)} fn */\n    set(fn) {\n      transformFn = fn;\n    }\n  },\n  'validateCallback': {\n    /** @return {?function()} */\n    get() {\n      return validateFn;\n    },\n    /**\n     * @param {?function()} fn\n     * @this {CustomStyleInterface}\n     */\n    set(fn) {\n      let needsEnqueue = false;\n      if (!validateFn) {\n        needsEnqueue = true;\n      }\n      validateFn = fn;\n      if (needsEnqueue) {\n        this.enqueueDocumentValidation();\n      }\n    },\n  }\n})\n\n/** @typedef {{\n * customStyles: !Array<!CustomStyleProvider>,\n * addCustomStyle: function(!CustomStyleProvider),\n * getStyleForCustomStyle: function(!CustomStyleProvider): HTMLStyleElement,\n * findStyles: function(),\n * transformCallback: ?function(!HTMLStyleElement),\n * validateCallback: ?function()\n * }}\n */\nexport let CustomStyleInterfaceInterface;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {parse, StyleNode} from './css-parse.js'\nimport {nativeShadow, nativeCssVariables} from './style-settings.js'\nimport StyleTransformer from './style-transformer.js'\nimport * as StyleUtil from './style-util.js'\nimport StyleProperties from './style-properties.js'\nimport placeholderMap from './style-placeholder.js'\nimport StyleInfo from './style-info.js'\nimport StyleCache from './style-cache.js'\nimport {flush as watcherFlush} from './document-watcher.js'\nimport templateMap from './template-map.js'\nimport * as ApplyShimUtils from './apply-shim-utils.js'\nimport documentWait from './document-wait.js'\nimport {updateNativeProperties, detectMixin} from './common-utils.js'\nimport {CustomStyleInterfaceInterface} from './custom-style-interface.js' //eslint-disable-line no-unused-vars\n\n/**\n * @const {StyleCache}\n */\nconst styleCache = new StyleCache();\n\nexport default class ScopingShim {\n  constructor() {\n    this._scopeCounter = {};\n    this._documentOwner = document.documentElement;\n    let ast = new StyleNode();\n    ast['rules'] = [];\n    this._documentOwnerStyleInfo = StyleInfo.set(this._documentOwner, new StyleInfo(ast));\n    this._elementsHaveApplied = false;\n    this._applyShim = null;\n    /** @type {?CustomStyleInterfaceInterface} */\n    this._customStyleInterface = null;\n    documentWait(() => {\n      this._ensure();\n    });\n  }\n  flush() {\n    watcherFlush();\n  }\n  _generateScopeSelector(name) {\n    let id = this._scopeCounter[name] = (this._scopeCounter[name] || 0) + 1;\n    return `${name}-${id}`;\n  }\n  getStyleAst(style) {\n    return StyleUtil.rulesForStyle(style);\n  }\n  styleAstToString(ast) {\n    return StyleUtil.toCssText(ast);\n  }\n  _gatherStyles(template) {\n    let styles = template.content.querySelectorAll('style');\n    let cssText = [];\n    for (let i = 0; i < styles.length; i++) {\n      let s = styles[i];\n      cssText.push(s.textContent);\n      s.parentNode.removeChild(s);\n    }\n    return cssText.join('').trim();\n  }\n  _getCssBuild(template) {\n    let style = template.content.querySelector('style');\n    if (!style) {\n      return '';\n    }\n    return style.getAttribute('css-build') || '';\n  }\n  /**\n   * Prepare the styling and template for the given element type\n   *\n   * @param {HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} typeExtension\n   */\n  prepareTemplate(template, elementName, typeExtension) {\n    if (template._prepared) {\n      return;\n    }\n    template._prepared = true;\n    template.name = elementName;\n    template.extends = typeExtension;\n    templateMap[elementName] = template;\n    let cssBuild = this._getCssBuild(template);\n    let cssText = this._gatherStyles(template);\n    let info = {\n      is: elementName,\n      extends: typeExtension,\n      __cssBuild: cssBuild,\n    };\n    if (!nativeShadow) {\n      StyleTransformer.dom(template.content, elementName);\n    }\n    // check if the styling has mixin definitions or uses\n    this._ensure();\n    let hasMixins = detectMixin(cssText)\n    let ast = parse(cssText);\n    // only run the applyshim transforms if there is a mixin involved\n    if (hasMixins && nativeCssVariables && this._applyShim) {\n      this._applyShim['transformRules'](ast, elementName);\n    }\n    template['_styleAst'] = ast;\n    template._cssBuild = cssBuild;\n\n    let ownPropertyNames = [];\n    if (!nativeCssVariables) {\n      ownPropertyNames = StyleProperties.decorateStyles(template['_styleAst'], info);\n    }\n    if (!ownPropertyNames.length || nativeCssVariables) {\n      let root = nativeShadow ? template.content : null;\n      let placeholder = placeholderMap[elementName];\n      let style = this._generateStaticStyle(info, template['_styleAst'], root, placeholder);\n      template._style = style;\n    }\n    template._ownPropertyNames = ownPropertyNames;\n  }\n  _generateStaticStyle(info, rules, shadowroot, placeholder) {\n    let cssText = StyleTransformer.elementStyles(info, rules);\n    if (cssText.length) {\n      return StyleUtil.applyCss(cssText, info.is, shadowroot, placeholder);\n    }\n  }\n  _prepareHost(host) {\n    let {is, typeExtension} = StyleUtil.getIsExtends(host);\n    let placeholder = placeholderMap[is];\n    let template = templateMap[is];\n    let ast;\n    let ownStylePropertyNames;\n    let cssBuild;\n    if (template) {\n      ast = template['_styleAst'];\n      ownStylePropertyNames = template._ownPropertyNames;\n      cssBuild = template._cssBuild;\n    }\n    return StyleInfo.set(host,\n      new StyleInfo(\n        ast,\n        placeholder,\n        ownStylePropertyNames,\n        is,\n        typeExtension,\n        cssBuild\n      )\n    );\n  }\n  _ensureApplyShim() {\n    if (this._applyShim) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.ApplyShim) {\n      this._applyShim = window.ShadyCSS.ApplyShim;\n      this._applyShim['invalidCallback'] = ApplyShimUtils.invalidate;\n    }\n  }\n  _ensureCustomStyleInterface() {\n    if (this._customStyleInterface) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.CustomStyleInterface) {\n      this._customStyleInterface = /** @type {!CustomStyleInterfaceInterface} */(window.ShadyCSS.CustomStyleInterface);\n      /** @type {function(!HTMLStyleElement)} */\n      this._customStyleInterface['transformCallback'] = (style) => {this.transformCustomStyleForDocument(style)};\n      this._customStyleInterface['validateCallback'] = () => {\n        requestAnimationFrame(() => {\n          if (this._customStyleInterface['enqueued'] || this._elementsHaveApplied) {\n            this.flushCustomStyles();\n          }\n        })\n      };\n    }\n  }\n  _ensure() {\n    this._ensureApplyShim();\n    this._ensureCustomStyleInterface();\n  }\n  /**\n   * Flush and apply custom styles to document\n   */\n  flushCustomStyles() {\n    this._ensure();\n    if (!this._customStyleInterface) {\n      return;\n    }\n    let customStyles = this._customStyleInterface['processStyles']();\n    // early return if custom-styles don't need validation\n    if (!this._customStyleInterface['enqueued']) {\n      return;\n    }\n    if (!nativeCssVariables) {\n      this._updateProperties(this._documentOwner, this._documentOwnerStyleInfo);\n      this._applyCustomStyles(customStyles);\n    } else {\n      this._revalidateCustomStyleApplyShim(customStyles);\n    }\n    this._customStyleInterface['enqueued'] = false;\n    // if custom elements have upgraded and there are no native css variables, we must recalculate the whole tree\n    if (this._elementsHaveApplied && !nativeCssVariables) {\n      this.styleDocument();\n    }\n  }\n  /**\n   * Apply styles for the given element\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} overrideProps\n   */\n  styleElement(host, overrideProps) {\n    let {is} = StyleUtil.getIsExtends(host);\n    let styleInfo = StyleInfo.get(host);\n    if (!styleInfo) {\n      styleInfo = this._prepareHost(host);\n    }\n    // Only trip the `elementsHaveApplied` flag if a node other that the root document has `applyStyle` called\n    if (!this._isRootOwner(host)) {\n      this._elementsHaveApplied = true;\n    }\n    if (overrideProps) {\n      styleInfo.overrideStyleProperties =\n        styleInfo.overrideStyleProperties || {};\n      Object.assign(styleInfo.overrideStyleProperties, overrideProps);\n    }\n    if (!nativeCssVariables) {\n     this._updateProperties(host, styleInfo);\n      if (styleInfo.ownStylePropertyNames && styleInfo.ownStylePropertyNames.length) {\n        this._applyStyleProperties(host, styleInfo);\n      }\n    } else {\n      if (styleInfo.overrideStyleProperties) {\n        updateNativeProperties(host, styleInfo.overrideStyleProperties);\n      }\n      let template = templateMap[is];\n      // bail early if there is no shadowroot for this element\n      if (!template && !this._isRootOwner(host)) {\n        return;\n      }\n      if (template && template._style && !ApplyShimUtils.templateIsValid(template)) {\n        // update template\n        if (!ApplyShimUtils.templateIsValidating(template)) {\n          this._ensure();\n          this._applyShim && this._applyShim['transformRules'](template['_styleAst'], is);\n          template._style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          ApplyShimUtils.startValidatingTemplate(template);\n        }\n        // update instance if native shadowdom\n        if (nativeShadow) {\n          let root = host.shadowRoot;\n          if (root) {\n            let style = root.querySelector('style');\n            style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          }\n        }\n        styleInfo.styleRules = template['_styleAst'];\n      }\n    }\n  }\n  _styleOwnerForNode(node) {\n    let root = node.getRootNode();\n    let host = root.host;\n    if (host) {\n      if (StyleInfo.get(host)) {\n        return host;\n      } else {\n        return this._styleOwnerForNode(host);\n      }\n    }\n    return this._documentOwner;\n  }\n  _isRootOwner(node) {\n    return (node === this._documentOwner);\n  }\n  _applyStyleProperties(host, styleInfo) {\n    let is = StyleUtil.getIsExtends(host).is;\n    let cacheEntry = styleCache.fetch(is, styleInfo.styleProperties, styleInfo.ownStylePropertyNames);\n    let cachedScopeSelector = cacheEntry && cacheEntry.scopeSelector;\n    let cachedStyle = cacheEntry ? cacheEntry.styleElement : null;\n    let oldScopeSelector = styleInfo.scopeSelector;\n    // only generate new scope if cached style is not found\n    styleInfo.scopeSelector = cachedScopeSelector || this._generateScopeSelector(is);\n    let style = StyleProperties.applyElementStyle(host, styleInfo.styleProperties, styleInfo.scopeSelector, cachedStyle);\n    if (!nativeShadow) {\n      StyleProperties.applyElementScopeSelector(host, styleInfo.scopeSelector, oldScopeSelector);\n    }\n    if (!cacheEntry) {\n      styleCache.store(is, styleInfo.styleProperties, style, styleInfo.scopeSelector);\n    }\n    return style;\n  }\n  _updateProperties(host, styleInfo) {\n    let owner = this._styleOwnerForNode(host);\n    let ownerStyleInfo = StyleInfo.get(owner);\n    let ownerProperties = ownerStyleInfo.styleProperties;\n    let props = Object.create(ownerProperties || null);\n    let hostAndRootProps = StyleProperties.hostAndRootPropertiesForScope(host, styleInfo.styleRules);\n    let propertyData = StyleProperties.propertyDataFromStyles(ownerStyleInfo.styleRules, host);\n    let propertiesMatchingHost = propertyData.properties\n    Object.assign(\n      props,\n      hostAndRootProps.hostProps,\n      propertiesMatchingHost,\n      hostAndRootProps.rootProps\n    );\n    this._mixinOverrideStyles(props, styleInfo.overrideStyleProperties);\n    StyleProperties.reify(props);\n    styleInfo.styleProperties = props;\n  }\n  _mixinOverrideStyles(props, overrides) {\n    for (let p in overrides) {\n      let v = overrides[p];\n      // skip override props if they are not truthy or 0\n      // in order to fall back to inherited values\n      if (v || v === 0) {\n        props[p] = v;\n      }\n    }\n  }\n  /**\n   * Update styles of the whole document\n   *\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    this.styleSubtree(this._documentOwner, properties);\n  }\n  /**\n   * Update styles of a subtree\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} properties\n   */\n  styleSubtree(host, properties) {\n    let root = host.shadowRoot;\n    if (root || this._isRootOwner(host)) {\n      this.styleElement(host, properties);\n    }\n    // process the shadowdom children of `host`\n    let shadowChildren = root && (root.children || root.childNodes);\n    if (shadowChildren) {\n      for (let i = 0; i < shadowChildren.length; i++) {\n        let c = /** @type {!HTMLElement} */(shadowChildren[i]);\n        this.styleSubtree(c);\n      }\n    } else {\n      // process the lightdom children of `host`\n      let children = host.children || host.childNodes;\n      if (children) {\n        for (let i = 0; i < children.length; i++) {\n          let c = /** @type {!HTMLElement} */(children[i]);\n          this.styleSubtree(c);\n        }\n      }\n    }\n  }\n  /* Custom Style operations */\n  _revalidateCustomStyleApplyShim(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        this._revalidateApplyShim(s);\n      }\n    }\n  }\n  _applyCustomStyles(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        StyleProperties.applyCustomStyle(s, this._documentOwnerStyleInfo.styleProperties);\n      }\n    }\n  }\n  transformCustomStyleForDocument(style) {\n    let ast = StyleUtil.rulesForStyle(style);\n    StyleUtil.forEachRule(ast, (rule) => {\n      if (nativeShadow) {\n        StyleTransformer.normalizeRootSelector(rule);\n      } else {\n        StyleTransformer.documentRule(rule);\n      }\n      if (nativeCssVariables) {\n        this._ensure();\n        this._applyShim && this._applyShim['transformRule'](rule);\n      }\n    });\n    if (nativeCssVariables) {\n      style.textContent = StyleUtil.toCssText(ast);\n    } else {\n      this._documentOwnerStyleInfo.styleRules.rules.push(ast);\n    }\n  }\n  _revalidateApplyShim(style) {\n    if (nativeCssVariables && this._applyShim) {\n      let ast = StyleUtil.rulesForStyle(style);\n      this._ensure();\n      this._applyShim['transformRules'](ast);\n      style.textContent = StyleUtil.toCssText(ast);\n    }\n  }\n  getComputedStyleValue(element, property) {\n    let value;\n    if (!nativeCssVariables) {\n      // element is either a style host, or an ancestor of a style host\n      let styleInfo = StyleInfo.get(element) || StyleInfo.get(this._styleOwnerForNode(element));\n      value = styleInfo.styleProperties[property];\n    }\n    // fall back to the property value from the computed styling\n    value = value || window.getComputedStyle(element).getPropertyValue(property);\n    // trim whitespace that can come after the `:` in css\n    // example: padding: 2px -> \" 2px\"\n    return value ? value.trim() : '';\n  }\n  // given an element and a classString, replaces\n  // the element's class with the provided classString and adds\n  // any necessary ShadyCSS static and property based scoping selectors\n  setElementClass(element, classString) {\n    let root = element.getRootNode();\n    let classes = classString ? classString.split(/\\s/) : [];\n    let scopeName = root.host && root.host.localName;\n    // If no scope, try to discover scope name from existing class.\n    // This can occur if, for example, a template stamped element that\n    // has been scoped is manipulated when not in a root.\n    if (!scopeName) {\n      var classAttr = element.getAttribute('class');\n      if (classAttr) {\n        let k$ = classAttr.split(/\\s/);\n        for (let i=0; i < k$.length; i++) {\n          if (k$[i] === StyleTransformer.SCOPE_NAME) {\n            scopeName = k$[i+1];\n            break;\n          }\n        }\n      }\n    }\n    if (scopeName) {\n      classes.push(StyleTransformer.SCOPE_NAME, scopeName);\n    }\n    if (!nativeCssVariables) {\n      let styleInfo = StyleInfo.get(element);\n      if (styleInfo && styleInfo.scopeSelector) {\n        classes.push(StyleProperties.XSCOPE_NAME, styleInfo.scopeSelector);\n      }\n    }\n    StyleUtil.setElementClassRaw(element, classes.join(' '));\n  }\n  _styleInfoForNode(node) {\n    return StyleInfo.get(node);\n  }\n}\n\n/* exports */\nScopingShim.prototype['flush'] = ScopingShim.prototype.flush;\nScopingShim.prototype['prepareTemplate'] = ScopingShim.prototype.prepareTemplate;\nScopingShim.prototype['styleElement'] = ScopingShim.prototype.styleElement;\nScopingShim.prototype['styleDocument'] = ScopingShim.prototype.styleDocument;\nScopingShim.prototype['styleSubtree'] = ScopingShim.prototype.styleSubtree;\nScopingShim.prototype['getComputedStyleValue'] = ScopingShim.prototype.getComputedStyleValue;\nScopingShim.prototype['setElementClass'] = ScopingShim.prototype.setElementClass;\nScopingShim.prototype['_styleInfoForNode'] = ScopingShim.prototype._styleInfoForNode;\nScopingShim.prototype['transformCustomStyleForDocument'] = ScopingShim.prototype.transformCustomStyleForDocument;\nScopingShim.prototype['getStyleAst'] = ScopingShim.prototype.getStyleAst;\nScopingShim.prototype['styleAstToString'] = ScopingShim.prototype.styleAstToString;\nScopingShim.prototype['flushCustomStyles'] = ScopingShim.prototype.flushCustomStyles;\nObject.defineProperties(ScopingShim.prototype, {\n  'nativeShadow': {\n    get() {\n      return nativeShadow;\n    }\n  },\n  'nativeCss': {\n    get() {\n      return nativeCssVariables;\n    }\n  }\n});","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport ScopingShim from '../src/scoping-shim.js'\nimport {nativeCssVariables, nativeShadow} from '../src/style-settings.js'\n\n/** @const {ScopingShim} */\nconst scopingShim = new ScopingShim();\n\nlet ApplyShim, CustomStyleInterface;\n\nif (window['ShadyCSS']) {\n  ApplyShim = window['ShadyCSS']['ApplyShim'];\n  CustomStyleInterface = window['ShadyCSS']['CustomStyleInterface'];\n}\n\nwindow.ShadyCSS = {\n  ScopingShim: scopingShim,\n  /**\n   * @param {!HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} elementExtends\n   */\n  prepareTemplate(template, elementName, elementExtends) {\n    scopingShim.flushCustomStyles();\n    scopingShim.prepareTemplate(template, elementName, elementExtends)\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   * @param {Object=} properties\n   */\n  styleSubtree(element, properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleSubtree(element, properties);\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   */\n  styleElement(element) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleElement(element);\n  },\n\n  /**\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleDocument(properties);\n  },\n\n  /**\n   * @param {Element} element\n   * @param {string} property\n   * @return {string}\n   */\n  getComputedStyleValue(element, property) {\n    return scopingShim.getComputedStyleValue(element, property);\n  },\n\n  nativeCss: nativeCssVariables,\n\n  nativeShadow: nativeShadow\n};\n\nif (ApplyShim) {\n  window.ShadyCSS.ApplyShim = ApplyShim;\n}\n\nif (CustomStyleInterface) {\n  window.ShadyCSS.CustomStyleInterface = CustomStyleInterface;\n}","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function() {\n  'use strict';\n  // It's desireable to provide a default stylesheet\n  // that's convenient for styling unresolved elements, but\n  // it's cumbersome to have to include this manually in every page.\n  // It would make sense to put inside some HTMLImport but\n  // the HTMLImports polyfill does not allow loading of stylesheets\n  // that block rendering. Therefore this injection is tolerated here.\n  //\n  // NOTE: position: relative fixes IE's failure to inherit opacity\n  // when a child is not statically positioned.\n  var style = document.createElement('style');\n  style.textContent = ''\n      + 'body {'\n      + 'transition: opacity ease-in 0.2s;'\n      + ' } \\n'\n      + 'body[unresolved] {'\n      + 'opacity: 0; display: block; overflow: hidden; position: relative;'\n      + ' } \\n'\n      ;\n  var head = document.querySelector('head');\n  head.insertBefore(style, 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+{"version":3,"file":"web-component-polyfills.min.js","sources":["../node_modules/es6-promise/lib/es6-promise/utils.js","../node_modules/es6-promise/lib/es6-promise/asap.js","../node_modules/es6-promise/lib/es6-promise/then.js","../node_modules/es6-promise/lib/es6-promise/promise/resolve.js","../node_modules/es6-promise/lib/es6-promise/-internal.js","../node_modules/es6-promise/lib/es6-promise/enumerator.js","../node_modules/es6-promise/lib/es6-promise/promise/all.js","../node_modules/es6-promise/lib/es6-promise/promise/race.js","../node_modules/es6-promise/lib/es6-promise/promise/reject.js","../node_modules/es6-promise/lib/es6-promise/promise.js","../node_modules/es6-promise/lib/es6-promise/polyfill.js","../node_modules/@webcomponents/shadydom/src/utils.js","../node_modules/@webcomponents/shadydom/src/flush.js","../node_modules/@webcomponents/shadydom/src/observe-changes.js","../node_modules/@webcomponents/shadydom/src/innerHTML.js","../node_modules/@webcomponents/shadydom/src/native-tree.js","../node_modules/@webcomponents/shadydom/src/patch-accessors.js","../node_modules/@webcomponents/shadydom/src/logical-tree.js","../node_modules/@webcomponents/shadydom/src/logical-mutation.js","../node_modules/@webcomponents/shadydom/src/patch-events.js","../node_modules/@webcomponents/shadydom/src/array-splice.js","../node_modules/@webcomponents/shadydom/src/attach-shadow.js","../node_modules/@webcomponents/shadydom/src/patch-builtins.js","../node_modules/@webcomponents/custom-elements/src/Utilities.js","../node_modules/@webcomponents/shadycss/src/css-parse.js","../node_modules/@webcomponents/shadycss/src/style-settings.js","../node_modules/@webcomponents/shadycss/src/unscoped-style-handler.js","../node_modules/@webcomponents/shadycss/src/style-util.js","../node_modules/@webcomponents/shadycss/src/style-properties.js","../node_modules/@webcomponents/shadycss/src/document-watcher.js","../node_modules/@webcomponents/shadycss/src/apply-shim-utils.js","../node_modules/@webcomponents/shadycss/src/document-wait.js","../node_modules/@webcomponents/shadycss/src/common-utils.js","../node_modules/webcomponents-platform/webcomponents-platform.js","../node_modules/@webcomponents/template/template.js","../node_modules/es6-promise/lib/es6-promise.js","../node_modules/es6-promise/lib/es6-promise.auto.js","../node_modules/webcomponents.js/src/pre-polyfill.js","../node_modules/@webcomponents/shadydom/src/native-methods.js","../node_modules/@webcomponents/shadydom/src/shadydom.js","../node_modules/@webcomponents/custom-elements/src/CustomElementState.js","../node_modules/@webcomponents/custom-elements/src/CustomElementInternals.js","../node_modules/@webcomponents/custom-elements/src/DocumentConstructionObserver.js","../node_modules/@webcomponents/custom-elements/src/Deferred.js","../node_modules/@webcomponents/custom-elements/src/CustomElementRegistry.js","../node_modules/@webcomponents/custom-elements/src/Patch/Native.js","../node_modules/@webcomponents/custom-elements/src/AlreadyConstructedMarker.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ParentNode.js","../node_modules/@webcomponents/custom-elements/src/Patch/Interface/ChildNode.js","../node_modules/@webcomponents/custom-elements/src/custom-elements.js","../node_modules/@webcomponents/custom-elements/src/Patch/HTMLElement.js","../node_modules/@webcomponents/custom-elements/src/Patch/Document.js","../node_modules/@webcomponents/custom-elements/src/Patch/DocumentFragment.js","../node_modules/@webcomponents/custom-elements/src/Patch/Node.js","../node_modules/@webcomponents/custom-elements/src/Patch/Element.js","../node_modules/@webcomponents/shadycss/src/common-regex.js","../node_modules/@webcomponents/shadycss/src/style-transformer.js","../node_modules/@webcomponents/shadycss/src/style-info.js","../node_modules/@webcomponents/shadycss/src/style-placeholder.js","../node_modules/@webcomponents/shadycss/src/style-cache.js","../node_modules/@webcomponents/shadycss/src/template-map.js","../node_modules/@webcomponents/shadycss/src/custom-style-interface.js","../node_modules/@webcomponents/shadycss/src/scoping-shim.js","../node_modules/@webcomponents/shadycss/entrypoints/scoping-shim.js","../node_modules/webcomponents.js/src/unresolved.js"],"sourcesContent":["export function objectOrFunction(x) {\n  let type = typeof x;\n  return x !== null && (type === 'object' || type === 'function');\n}\n\nexport function isFunction(x) {\n  return typeof x === 'function';\n}\n\nexport function isMaybeThenable(x) {\n  return x !== null && typeof x === 'object';\n}\n\nlet _isArray;\nif (Array.isArray) {\n  _isArray = Array.isArray;\n} else {\n  _isArray = x => Object.prototype.toString.call(x) === '[object Array]';\n}\n\nexport const isArray = _isArray;\n","let len = 0;\nlet vertxNext;\nlet customSchedulerFn;\n\nexport var asap = function asap(callback, arg) {\n  queue[len] = callback;\n  queue[len + 1] = arg;\n  len += 2;\n  if (len === 2) {\n    // If len is 2, that means that we need to schedule an async flush.\n    // If additional callbacks are queued before the queue is flushed, they\n    // will be processed by this flush that we are scheduling.\n    if (customSchedulerFn) {\n      customSchedulerFn(flush);\n    } else {\n      scheduleFlush();\n    }\n  }\n}\n\nexport function setScheduler(scheduleFn) {\n  customSchedulerFn = scheduleFn;\n}\n\nexport function setAsap(asapFn) {\n  asap = asapFn;\n}\n\nconst browserWindow = (typeof window !== 'undefined') ? window : undefined;\nconst browserGlobal = browserWindow || {};\nconst BrowserMutationObserver = browserGlobal.MutationObserver || browserGlobal.WebKitMutationObserver;\nconst isNode = typeof self === 'undefined' && typeof process !== 'undefined' && {}.toString.call(process) === '[object process]';\n\n// test for web worker but not in IE10\nconst isWorker = typeof Uint8ClampedArray !== 'undefined' &&\n  typeof importScripts !== 'undefined' &&\n  typeof MessageChannel !== 'undefined';\n\n// node\nfunction useNextTick() {\n  // node version 0.10.x displays a deprecation warning when nextTick is used recursively\n  // see https://github.com/cujojs/when/issues/410 for details\n  return () => process.nextTick(flush);\n}\n\n// vertx\nfunction useVertxTimer() {\n  if (typeof vertxNext !== 'undefined') {\n    return function() {\n      vertxNext(flush);\n    };\n  }\n\n  return useSetTimeout();\n}\n\nfunction useMutationObserver() {\n  let iterations = 0;\n  const observer = new BrowserMutationObserver(flush);\n  const node = document.createTextNode('');\n  observer.observe(node, { characterData: true });\n\n  return () => {\n    node.data = (iterations = ++iterations % 2);\n  };\n}\n\n// web worker\nfunction useMessageChannel() {\n  const channel = new MessageChannel();\n  channel.port1.onmessage = flush;\n  return () => channel.port2.postMessage(0);\n}\n\nfunction useSetTimeout() {\n  // Store setTimeout reference so es6-promise will be unaffected by\n  // other code modifying setTimeout (like sinon.useFakeTimers())\n  const globalSetTimeout = setTimeout;\n  return () => globalSetTimeout(flush, 1);\n}\n\nconst queue = new Array(1000);\nfunction flush() {\n  for (let i = 0; i < len; i+=2) {\n    let callback = queue[i];\n    let arg = queue[i+1];\n\n    callback(arg);\n\n    queue[i] = undefined;\n    queue[i+1] = undefined;\n  }\n\n  len = 0;\n}\n\nfunction attemptVertx() {\n  try {\n    const vertx = Function('return this')().require('vertx');\n    vertxNext = vertx.runOnLoop || vertx.runOnContext;\n    return useVertxTimer();\n  } catch(e) {\n    return useSetTimeout();\n  }\n}\n\nlet scheduleFlush;\n// Decide what async method to use to triggering processing of queued callbacks:\nif (isNode) {\n  scheduleFlush = useNextTick();\n} else if (BrowserMutationObserver) {\n  scheduleFlush = useMutationObserver();\n} else if (isWorker) {\n  scheduleFlush = useMessageChannel();\n} else if (browserWindow === undefined && typeof require === 'function') {\n  scheduleFlush = attemptVertx();\n} else {\n  scheduleFlush = useSetTimeout();\n}\n","import {\n  invokeCallback,\n  subscribe,\n  FULFILLED,\n  REJECTED,\n  noop,\n  makePromise,\n  PROMISE_ID\n} from './-internal';\n\nimport { asap } from './asap';\n\nexport default function then(onFulfillment, onRejection) {\n  const parent = this;\n\n  const child = new this.constructor(noop);\n\n  if (child[PROMISE_ID] === undefined) {\n    makePromise(child);\n  }\n\n  const { _state } = parent;\n\n  if (_state) {\n    const callback = arguments[_state - 1];\n    asap(() => invokeCallback(_state, child, callback, parent._result));\n  } else {\n    subscribe(parent, child, onFulfillment, onRejection);\n  }\n\n  return child;\n}\n","import {\n  noop,\n  resolve as _resolve\n} from '../-internal';\n\n/**\n  `Promise.resolve` returns a promise that will become resolved with the\n  passed `value`. It is shorthand for the following:\n\n  ```javascript\n  let promise = new Promise(function(resolve, reject){\n    resolve(1);\n  });\n\n  promise.then(function(value){\n    // value === 1\n  });\n  ```\n\n  Instead of writing the above, your code now simply becomes the following:\n\n  ```javascript\n  let promise = Promise.resolve(1);\n\n  promise.then(function(value){\n    // value === 1\n  });\n  ```\n\n  @method resolve\n  @static\n  @param {Any} value value that the returned promise will be resolved with\n  Useful for tooling.\n  @return {Promise} a promise that will become fulfilled with the given\n  `value`\n*/\nexport default function resolve(object) {\n  /*jshint validthis:true */\n  let Constructor = this;\n\n  if (object && typeof object === 'object' && object.constructor === Constructor) {\n    return object;\n  }\n\n  let promise = new Constructor(noop);\n  _resolve(promise, object);\n  return promise;\n}\n","import {\n  objectOrFunction,\n  isFunction\n} from './utils';\n\nimport {\n  asap\n} from './asap';\n\nimport originalThen from './then';\nimport originalResolve from './promise/resolve';\n\nexport const PROMISE_ID = Math.random().toString(36).substring(2);\n\nfunction noop() {}\n\nconst PENDING   = void 0;\nconst FULFILLED = 1;\nconst REJECTED  = 2;\n\nconst TRY_CATCH_ERROR = { error: null };\n\nfunction selfFulfillment() {\n  return new TypeError(\"You cannot resolve a promise with itself\");\n}\n\nfunction cannotReturnOwn() {\n  return new TypeError('A promises callback cannot return that same promise.');\n}\n\nfunction getThen(promise) {\n  try {\n    return promise.then;\n  } catch(error) {\n    TRY_CATCH_ERROR.error = error;\n    return TRY_CATCH_ERROR;\n  }\n}\n\nfunction tryThen(then, value, fulfillmentHandler, rejectionHandler) {\n  try {\n    then.call(value, fulfillmentHandler, rejectionHandler);\n  } catch(e) {\n    return e;\n  }\n}\n\nfunction handleForeignThenable(promise, thenable, then) {\n   asap(promise => {\n    var sealed = false;\n    var error = tryThen(then, thenable, value => {\n      if (sealed) { return; }\n      sealed = true;\n      if (thenable !== value) {\n        resolve(promise, value);\n      } else {\n        fulfill(promise, value);\n      }\n    }, reason => {\n      if (sealed) { return; }\n      sealed = true;\n\n      reject(promise, reason);\n    }, 'Settle: ' + (promise._label || ' unknown promise'));\n\n    if (!sealed && error) {\n      sealed = true;\n      reject(promise, error);\n    }\n  }, promise);\n}\n\nfunction handleOwnThenable(promise, thenable) {\n  if (thenable._state === FULFILLED) {\n    fulfill(promise, thenable._result);\n  } else if (thenable._state === REJECTED) {\n    reject(promise, thenable._result);\n  } else {\n    subscribe(thenable, undefined, value  => resolve(promise, value),\n                                   reason => reject(promise, reason))\n  }\n}\n\nfunction handleMaybeThenable(promise, maybeThenable, then) {\n  if (maybeThenable.constructor === promise.constructor &&\n      then === originalThen &&\n      maybeThenable.constructor.resolve === originalResolve) {\n    handleOwnThenable(promise, maybeThenable);\n  } else {\n    if (then === TRY_CATCH_ERROR) {\n      reject(promise, TRY_CATCH_ERROR.error);\n      TRY_CATCH_ERROR.error = null;\n    } else if (then === undefined) {\n      fulfill(promise, maybeThenable);\n    } else if (isFunction(then)) {\n      handleForeignThenable(promise, maybeThenable, then);\n    } else {\n      fulfill(promise, maybeThenable);\n    }\n  }\n}\n\nfunction resolve(promise, value) {\n  if (promise === value) {\n    reject(promise, selfFulfillment());\n  } else if (objectOrFunction(value)) {\n    handleMaybeThenable(promise, value, getThen(value));\n  } else {\n    fulfill(promise, value);\n  }\n}\n\nfunction publishRejection(promise) {\n  if (promise._onerror) {\n    promise._onerror(promise._result);\n  }\n\n  publish(promise);\n}\n\nfunction fulfill(promise, value) {\n  if (promise._state !== PENDING) { return; }\n\n  promise._result = value;\n  promise._state = FULFILLED;\n\n  if (promise._subscribers.length !== 0) {\n    asap(publish, promise);\n  }\n}\n\nfunction reject(promise, reason) {\n  if (promise._state !== PENDING) { return; }\n  promise._state = REJECTED;\n  promise._result = reason;\n\n  asap(publishRejection, promise);\n}\n\nfunction subscribe(parent, child, onFulfillment, onRejection) {\n  let { _subscribers } = parent;\n  let { length } = _subscribers;\n\n  parent._onerror = null;\n\n  _subscribers[length] = child;\n  _subscribers[length + FULFILLED] = onFulfillment;\n  _subscribers[length + REJECTED]  = onRejection;\n\n  if (length === 0 && parent._state) {\n    asap(publish, parent);\n  }\n}\n\nfunction publish(promise) {\n  let subscribers = promise._subscribers;\n  let settled = promise._state;\n\n  if (subscribers.length === 0) { return; }\n\n  let child, callback, detail = promise._result;\n\n  for (let i = 0; i < subscribers.length; i += 3) {\n    child = subscribers[i];\n    callback = subscribers[i + settled];\n\n    if (child) {\n      invokeCallback(settled, child, callback, detail);\n    } else {\n      callback(detail);\n    }\n  }\n\n  promise._subscribers.length = 0;\n}\n\n\nfunction tryCatch(callback, detail) {\n  try {\n    return callback(detail);\n  } catch(e) {\n    TRY_CATCH_ERROR.error = e;\n    return TRY_CATCH_ERROR;\n  }\n}\n\nfunction invokeCallback(settled, promise, callback, detail) {\n  let hasCallback = isFunction(callback),\n      value, error, succeeded, failed;\n\n  if (hasCallback) {\n    value = tryCatch(callback, detail);\n\n    if (value === TRY_CATCH_ERROR) {\n      failed = true;\n      error = value.error;\n      value.error = null;\n    } else {\n      succeeded = true;\n    }\n\n    if (promise === value) {\n      reject(promise, cannotReturnOwn());\n      return;\n    }\n\n  } else {\n    value = detail;\n    succeeded = true;\n  }\n\n  if (promise._state !== PENDING) {\n    // noop\n  } else if (hasCallback && succeeded) {\n    resolve(promise, value);\n  } else if (failed) {\n    reject(promise, error);\n  } else if (settled === FULFILLED) {\n    fulfill(promise, value);\n  } else if (settled === REJECTED) {\n    reject(promise, value);\n  }\n}\n\nfunction initializePromise(promise, resolver) {\n  try {\n    resolver(function resolvePromise(value){\n      resolve(promise, value);\n    }, function rejectPromise(reason) {\n      reject(promise, reason);\n    });\n  } catch(e) {\n    reject(promise, e);\n  }\n}\n\nlet id = 0;\nfunction nextId() {\n  return id++;\n}\n\nfunction makePromise(promise) {\n  promise[PROMISE_ID] = id++;\n  promise._state = undefined;\n  promise._result = undefined;\n  promise._subscribers = [];\n}\n\nexport {\n  nextId,\n  makePromise,\n  getThen,\n  noop,\n  resolve,\n  reject,\n  fulfill,\n  subscribe,\n  publish,\n  publishRejection,\n  initializePromise,\n  invokeCallback,\n  FULFILLED,\n  REJECTED,\n  PENDING,\n  handleMaybeThenable\n};\n","import {\n  isArray,\n  isMaybeThenable\n} from './utils';\nimport {\n  noop,\n  reject,\n  fulfill,\n  subscribe,\n  FULFILLED,\n  REJECTED,\n  PENDING,\n  getThen,\n  handleMaybeThenable\n} from './-internal';\n\nimport then from './then';\nimport Promise from './promise';\nimport originalResolve from './promise/resolve';\nimport originalThen from './then';\nimport { makePromise, PROMISE_ID } from './-internal';\n\nfunction validationError() {\n  return new Error('Array Methods must be provided an Array');\n};\n\nexport default class Enumerator {\n  constructor(Constructor, input) {\n    this._instanceConstructor = Constructor;\n    this.promise = new Constructor(noop);\n\n    if (!this.promise[PROMISE_ID]) {\n      makePromise(this.promise);\n    }\n\n    if (isArray(input)) {\n      this.length     = input.length;\n      this._remaining = input.length;\n\n      this._result = new Array(this.length);\n\n      if (this.length === 0) {\n        fulfill(this.promise, this._result);\n      } else {\n        this.length = this.length || 0;\n        this._enumerate(input);\n        if (this._remaining === 0) {\n          fulfill(this.promise, this._result);\n        }\n      }\n    } else {\n      reject(this.promise, validationError());\n    }\n  }\n  _enumerate(input) {\n    for (let i = 0; this._state === PENDING && i < input.length; i++) {\n      this._eachEntry(input[i], i);\n    }\n  }\n\n  _eachEntry(entry, i) {\n    let c = this._instanceConstructor;\n    let { resolve } = c;\n\n    if (resolve === originalResolve) {\n      let then = getThen(entry);\n\n      if (then === originalThen &&\n        entry._state !== PENDING) {\n        this._settledAt(entry._state, i, entry._result);\n      } else if (typeof then !== 'function') {\n        this._remaining--;\n        this._result[i] = entry;\n      } else if (c === Promise) {\n        let promise = new c(noop);\n        handleMaybeThenable(promise, entry, then);\n        this._willSettleAt(promise, i);\n      } else {\n        this._willSettleAt(new c(resolve => resolve(entry)), i);\n      }\n    } else {\n      this._willSettleAt(resolve(entry), i);\n    }\n  }\n\n  _settledAt(state, i, value) {\n    let { promise } = this;\n\n    if (promise._state === PENDING) {\n      this._remaining--;\n\n      if (state === REJECTED) {\n        reject(promise, value);\n      } else {\n        this._result[i] = value;\n      }\n    }\n\n    if (this._remaining === 0) {\n      fulfill(promise, this._result);\n    }\n  }\n\n  _willSettleAt(promise, i) {\n    let enumerator = this;\n\n    subscribe(\n      promise, undefined,\n      value => enumerator._settledAt(FULFILLED, i, value),\n      reason => enumerator._settledAt(REJECTED, i, reason)\n    );\n  }\n};\n","import Enumerator from '../enumerator';\n\n/**\n  `Promise.all` accepts an array of promises, and returns a new promise which\n  is fulfilled with an array of fulfillment values for the passed promises, or\n  rejected with the reason of the first passed promise to be rejected. It casts all\n  elements of the passed iterable to promises as it runs this algorithm.\n\n  Example:\n\n  ```javascript\n  let promise1 = resolve(1);\n  let promise2 = resolve(2);\n  let promise3 = resolve(3);\n  let promises = [ promise1, promise2, promise3 ];\n\n  Promise.all(promises).then(function(array){\n    // The array here would be [ 1, 2, 3 ];\n  });\n  ```\n\n  If any of the `promises` given to `all` are rejected, the first promise\n  that is rejected will be given as an argument to the returned promises's\n  rejection handler. For example:\n\n  Example:\n\n  ```javascript\n  let promise1 = resolve(1);\n  let promise2 = reject(new Error(\"2\"));\n  let promise3 = reject(new Error(\"3\"));\n  let promises = [ promise1, promise2, promise3 ];\n\n  Promise.all(promises).then(function(array){\n    // Code here never runs because there are rejected promises!\n  }, function(error) {\n    // error.message === \"2\"\n  });\n  ```\n\n  @method all\n  @static\n  @param {Array} entries array of promises\n  @param {String} label optional string for labeling the promise.\n  Useful for tooling.\n  @return {Promise} promise that is fulfilled when all `promises` have been\n  fulfilled, or rejected if any of them become rejected.\n  @static\n*/\nexport default function all(entries) {\n  return new Enumerator(this, entries).promise;\n}\n","import {\n  isArray\n} from \"../utils\";\n\n/**\n  `Promise.race` returns a new promise which is settled in the same way as the\n  first passed promise to settle.\n\n  Example:\n\n  ```javascript\n  let promise1 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 1');\n    }, 200);\n  });\n\n  let promise2 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 2');\n    }, 100);\n  });\n\n  Promise.race([promise1, promise2]).then(function(result){\n    // result === 'promise 2' because it was resolved before promise1\n    // was resolved.\n  });\n  ```\n\n  `Promise.race` is deterministic in that only the state of the first\n  settled promise matters. For example, even if other promises given to the\n  `promises` array argument are resolved, but the first settled promise has\n  become rejected before the other promises became fulfilled, the returned\n  promise will become rejected:\n\n  ```javascript\n  let promise1 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      resolve('promise 1');\n    }, 200);\n  });\n\n  let promise2 = new Promise(function(resolve, reject){\n    setTimeout(function(){\n      reject(new Error('promise 2'));\n    }, 100);\n  });\n\n  Promise.race([promise1, promise2]).then(function(result){\n    // Code here never runs\n  }, function(reason){\n    // reason.message === 'promise 2' because promise 2 became rejected before\n    // promise 1 became fulfilled\n  });\n  ```\n\n  An example real-world use case is implementing timeouts:\n\n  ```javascript\n  Promise.race([ajax('foo.json'), timeout(5000)])\n  ```\n\n  @method race\n  @static\n  @param {Array} promises array of promises to observe\n  Useful for tooling.\n  @return {Promise} a promise which settles in the same way as the first passed\n  promise to settle.\n*/\nexport default function race(entries) {\n  /*jshint validthis:true */\n  let Constructor = this;\n\n  if (!isArray(entries)) {\n    return new Constructor((_, reject) => reject(new TypeError('You must pass an array to race.')));\n  } else {\n    return new Constructor((resolve, reject) => {\n      let length = entries.length;\n      for (let i = 0; i < length; i++) {\n        Constructor.resolve(entries[i]).then(resolve, reject);\n      }\n    });\n  }\n}\n","import {\n  noop,\n  reject as _reject\n} from '../-internal';\n\n/**\n  `Promise.reject` returns a promise rejected with the passed `reason`.\n  It is shorthand for the following:\n\n  ```javascript\n  let promise = new Promise(function(resolve, reject){\n    reject(new Error('WHOOPS'));\n  });\n\n  promise.then(function(value){\n    // Code here doesn't run because the promise is rejected!\n  }, function(reason){\n    // reason.message === 'WHOOPS'\n  });\n  ```\n\n  Instead of writing the above, your code now simply becomes the following:\n\n  ```javascript\n  let promise = Promise.reject(new Error('WHOOPS'));\n\n  promise.then(function(value){\n    // Code here doesn't run because the promise is rejected!\n  }, function(reason){\n    // reason.message === 'WHOOPS'\n  });\n  ```\n\n  @method reject\n  @static\n  @param {Any} reason value that the returned promise will be rejected with.\n  Useful for tooling.\n  @return {Promise} a promise rejected with the given `reason`.\n*/\nexport default function reject(reason) {\n  /*jshint validthis:true */\n  let Constructor = this;\n  let promise = new Constructor(noop);\n  _reject(promise, reason);\n  return promise;\n}\n","import {\n  isFunction\n} from './utils';\nimport {\n  noop,\n  nextId,\n  PROMISE_ID,\n  initializePromise\n} from './-internal';\nimport {\n  asap,\n  setAsap,\n  setScheduler\n} from './asap';\n\nimport all from './promise/all';\nimport race from './promise/race';\nimport Resolve from './promise/resolve';\nimport Reject from './promise/reject';\nimport then from './then';\n\nfunction needsResolver() {\n  throw new TypeError('You must pass a resolver function as the first argument to the promise constructor');\n}\n\nfunction needsNew() {\n  throw new TypeError(\"Failed to construct 'Promise': Please use the 'new' operator, this object constructor cannot be called as a function.\");\n}\n\n/**\n  Promise objects represent the eventual result of an asynchronous operation. The\n  primary way of interacting with a promise is through its `then` method, which\n  registers callbacks to receive either a promise's eventual value or the reason\n  why the promise cannot be fulfilled.\n\n  Terminology\n  -----------\n\n  - `promise` is an object or function with a `then` method whose behavior conforms to this specification.\n  - `thenable` is an object or function that defines a `then` method.\n  - `value` is any legal JavaScript value (including undefined, a thenable, or a promise).\n  - `exception` is a value that is thrown using the throw statement.\n  - `reason` is a value that indicates why a promise was rejected.\n  - `settled` the final resting state of a promise, fulfilled or rejected.\n\n  A promise can be in one of three states: pending, fulfilled, or rejected.\n\n  Promises that are fulfilled have a fulfillment value and are in the fulfilled\n  state.  Promises that are rejected have a rejection reason and are in the\n  rejected state.  A fulfillment value is never a thenable.\n\n  Promises can also be said to *resolve* a value.  If this value is also a\n  promise, then the original promise's settled state will match the value's\n  settled state.  So a promise that *resolves* a promise that rejects will\n  itself reject, and a promise that *resolves* a promise that fulfills will\n  itself fulfill.\n\n\n  Basic Usage:\n  ------------\n\n  ```js\n  let promise = new Promise(function(resolve, reject) {\n    // on success\n    resolve(value);\n\n    // on failure\n    reject(reason);\n  });\n\n  promise.then(function(value) {\n    // on fulfillment\n  }, function(reason) {\n    // on rejection\n  });\n  ```\n\n  Advanced Usage:\n  ---------------\n\n  Promises shine when abstracting away asynchronous interactions such as\n  `XMLHttpRequest`s.\n\n  ```js\n  function getJSON(url) {\n    return new Promise(function(resolve, reject){\n      let xhr = new XMLHttpRequest();\n\n      xhr.open('GET', url);\n      xhr.onreadystatechange = handler;\n      xhr.responseType = 'json';\n      xhr.setRequestHeader('Accept', 'application/json');\n      xhr.send();\n\n      function handler() {\n        if (this.readyState === this.DONE) {\n          if (this.status === 200) {\n            resolve(this.response);\n          } else {\n            reject(new Error('getJSON: `' + url + '` failed with status: [' + this.status + ']'));\n          }\n        }\n      };\n    });\n  }\n\n  getJSON('/posts.json').then(function(json) {\n    // on fulfillment\n  }, function(reason) {\n    // on rejection\n  });\n  ```\n\n  Unlike callbacks, promises are great composable primitives.\n\n  ```js\n  Promise.all([\n    getJSON('/posts'),\n    getJSON('/comments')\n  ]).then(function(values){\n    values[0] // => postsJSON\n    values[1] // => commentsJSON\n\n    return values;\n  });\n  ```\n\n  @class Promise\n  @param {Function} resolver\n  Useful for tooling.\n  @constructor\n*/\n\nclass Promise {\n  constructor(resolver) {\n    this[PROMISE_ID] = nextId();\n    this._result = this._state = undefined;\n    this._subscribers = [];\n\n    if (noop !== resolver) {\n      typeof resolver !== 'function' && needsResolver();\n      this instanceof Promise ? initializePromise(this, resolver) : needsNew();\n    }\n  }\n\n  /**\n  The primary way of interacting with a promise is through its `then` method,\n  which registers callbacks to receive either a promise's eventual value or the\n  reason why the promise cannot be fulfilled.\n\n  ```js\n  findUser().then(function(user){\n    // user is available\n  }, function(reason){\n    // user is unavailable, and you are given the reason why\n  });\n  ```\n\n  Chaining\n  --------\n\n  The return value of `then` is itself a promise.  This second, 'downstream'\n  promise is resolved with the return value of the first promise's fulfillment\n  or rejection handler, or rejected if the handler throws an exception.\n\n  ```js\n  findUser().then(function (user) {\n    return user.name;\n  }, function (reason) {\n    return 'default name';\n  }).then(function (userName) {\n    // If `findUser` fulfilled, `userName` will be the user's name, otherwise it\n    // will be `'default name'`\n  });\n\n  findUser().then(function (user) {\n    throw new Error('Found user, but still unhappy');\n  }, function (reason) {\n    throw new Error('`findUser` rejected and we're unhappy');\n  }).then(function (value) {\n    // never reached\n  }, function (reason) {\n    // if `findUser` fulfilled, `reason` will be 'Found user, but still unhappy'.\n    // If `findUser` rejected, `reason` will be '`findUser` rejected and we're unhappy'.\n  });\n  ```\n  If the downstream promise does not specify a rejection handler, rejection reasons will be propagated further downstream.\n\n  ```js\n  findUser().then(function (user) {\n    throw new PedagogicalException('Upstream error');\n  }).then(function (value) {\n    // never reached\n  }).then(function (value) {\n    // never reached\n  }, function (reason) {\n    // The `PedgagocialException` is propagated all the way down to here\n  });\n  ```\n\n  Assimilation\n  ------------\n\n  Sometimes the value you want to propagate to a downstream promise can only be\n  retrieved asynchronously. This can be achieved by returning a promise in the\n  fulfillment or rejection handler. The downstream promise will then be pending\n  until the returned promise is settled. This is called *assimilation*.\n\n  ```js\n  findUser().then(function (user) {\n    return findCommentsByAuthor(user);\n  }).then(function (comments) {\n    // The user's comments are now available\n  });\n  ```\n\n  If the assimliated promise rejects, then the downstream promise will also reject.\n\n  ```js\n  findUser().then(function (user) {\n    return findCommentsByAuthor(user);\n  }).then(function (comments) {\n    // If `findCommentsByAuthor` fulfills, we'll have the value here\n  }, function (reason) {\n    // If `findCommentsByAuthor` rejects, we'll have the reason here\n  });\n  ```\n\n  Simple Example\n  --------------\n\n  Synchronous Example\n\n  ```javascript\n  let result;\n\n  try {\n    result = findResult();\n    // success\n  } catch(reason) {\n    // failure\n  }\n  ```\n\n  Errback Example\n\n  ```js\n  findResult(function(result, err){\n    if (err) {\n      // failure\n    } else {\n      // success\n    }\n  });\n  ```\n\n  Promise Example;\n\n  ```javascript\n  findResult().then(function(result){\n    // success\n  }, function(reason){\n    // failure\n  });\n  ```\n\n  Advanced Example\n  --------------\n\n  Synchronous Example\n\n  ```javascript\n  let author, books;\n\n  try {\n    author = findAuthor();\n    books  = findBooksByAuthor(author);\n    // success\n  } catch(reason) {\n    // failure\n  }\n  ```\n\n  Errback Example\n\n  ```js\n\n  function foundBooks(books) {\n\n  }\n\n  function failure(reason) {\n\n  }\n\n  findAuthor(function(author, err){\n    if (err) {\n      failure(err);\n      // failure\n    } else {\n      try {\n        findBoooksByAuthor(author, function(books, err) {\n          if (err) {\n            failure(err);\n          } else {\n            try {\n              foundBooks(books);\n            } catch(reason) {\n              failure(reason);\n            }\n          }\n        });\n      } catch(error) {\n        failure(err);\n      }\n      // success\n    }\n  });\n  ```\n\n  Promise Example;\n\n  ```javascript\n  findAuthor().\n    then(findBooksByAuthor).\n    then(function(books){\n      // found books\n  }).catch(function(reason){\n    // something went wrong\n  });\n  ```\n\n  @method then\n  @param {Function} onFulfilled\n  @param {Function} onRejected\n  Useful for tooling.\n  @return {Promise}\n  */\n\n    /**\n  `catch` is simply sugar for `then(undefined, onRejection)` which makes it the same\n  as the catch block of a try/catch statement.\n\n  ```js\n  function findAuthor(){\n    throw new Error('couldn't find that author');\n  }\n\n  // synchronous\n  try {\n    findAuthor();\n  } catch(reason) {\n    // something went wrong\n  }\n\n  // async with promises\n  findAuthor().catch(function(reason){\n    // something went wrong\n  });\n  ```\n\n  @method catch\n  @param {Function} onRejection\n  Useful for tooling.\n  @return {Promise}\n  */\n  catch(onRejection) {\n    return this.then(null, onRejection);\n  }\n\n/**\n  `finally` will be invoked regardless of the promise's fate just as native\n  try/catch/finally behaves\n\n  Synchronous example:\n\n  ```js\n  findAuthor() {\n    if (Math.random() > 0.5) {\n      throw new Error();\n    }\n    return new Author();\n  }\n\n  try {\n    return findAuthor(); // succeed or fail\n  } catch(error) {\n    return findOtherAuther();\n  } finally {\n    // always runs\n    // doesn't affect the return value\n  }\n  ```\n\n  Asynchronous example:\n\n  ```js\n  findAuthor().catch(function(reason){\n    return findOtherAuther();\n  }).finally(function(){\n    // author was either found, or not\n  });\n  ```\n\n  @method finally\n  @param {Function} callback\n  @return {Promise}\n*/\n  finally(callback) {\n    let promise = this;\n    let constructor = promise.constructor;\n\n    return promise.then(value => constructor.resolve(callback()).then(() => value),\n                       reason => constructor.resolve(callback()).then(() => { throw reason; }));\n  }\n}\n\nPromise.prototype.then = then;\nexport default Promise;\nPromise.all = all;\nPromise.race = race;\nPromise.resolve = Resolve;\nPromise.reject = Reject;\nPromise._setScheduler = setScheduler;\nPromise._setAsap = setAsap;\nPromise._asap = asap;\n\n","/*global self*/\nimport Promise from './promise';\n\nexport default function polyfill() {\n  let local;\n\n  if (typeof global !== 'undefined') {\n    local = global;\n  } else if (typeof self !== 'undefined') {\n    local = self;\n  } else {\n    try {\n      local = Function('return this')();\n    } catch (e) {\n      throw new Error('polyfill failed because global object is unavailable in this environment');\n    }\n  }\n\n  let P = local.Promise;\n\n  if (P) {\n    var promiseToString = null;\n    try {\n      promiseToString = Object.prototype.toString.call(P.resolve());\n    } catch(e) {\n      // silently ignored\n    }\n\n    if (promiseToString === '[object Promise]' && !P.cast){\n      return;\n    }\n  }\n\n  local.Promise = Promise;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let settings = window['ShadyDOM'] || {};\n\nsettings.hasNativeShadowDOM = Boolean(Element.prototype.attachShadow && Node.prototype.getRootNode);\n\nlet desc = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild');\n\nsettings.hasDescriptors = Boolean(desc && desc.configurable && desc.get);\nsettings.inUse = settings['force'] || !settings.hasNativeShadowDOM;\n\nexport function isTrackingLogicalChildNodes(node) {\n  return (node.__shady && node.__shady.firstChild !== undefined);\n}\n\nexport function isShadyRoot(obj) {\n  return Boolean(obj.__localName === 'ShadyRoot');\n}\n\nexport function ownerShadyRootForNode(node) {\n  let root = node.getRootNode();\n  if (isShadyRoot(root)) {\n    return root;\n  }\n}\n\nlet p = Element.prototype;\nlet matches = p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\n  p.oMatchesSelector || p.webkitMatchesSelector;\n\nexport function matchesSelector(element, selector) {\n  return matches.call(element, selector);\n}\n\nfunction copyOwnProperty(name, source, target) {\n  let pd = Object.getOwnPropertyDescriptor(source, name);\n  if (pd) {\n    Object.defineProperty(target, name, pd);\n  }\n}\n\nexport function extend(target, source) {\n  if (target && source) {\n    let n$ = Object.getOwnPropertyNames(source);\n    for (let i=0, n; (i<n$.length) && (n=n$[i]); i++) {\n      copyOwnProperty(n, source, target);\n    }\n  }\n  return target || source;\n}\n\nexport function extendAll(target, ...sources) {\n  for (let i=0; i < sources.length; i++) {\n    extend(target, sources[i]);\n  }\n  return target;\n}\n\nexport function mixin(target, source) {\n  for (var i in source) {\n    target[i] = source[i];\n  }\n  return target;\n}\n\nexport function patchPrototype(obj, mixin) {\n  let proto = Object.getPrototypeOf(obj);\n  if (!proto.hasOwnProperty('__patchProto')) {\n    let patchProto = Object.create(proto);\n    patchProto.__sourceProto = proto;\n    extend(patchProto, mixin);\n    proto['__patchProto'] = patchProto;\n  }\n  // old browsers don't have setPrototypeOf\n  obj.__proto__ = proto['__patchProto'];\n}\n\n\nlet twiddle = document.createTextNode('');\nlet content = 0;\nlet queue = [];\nnew MutationObserver(() => {\n  while (queue.length) {\n    // catch errors in user code...\n    try {\n      queue.shift()();\n    } catch(e) {\n      // enqueue another record and throw\n      twiddle.textContent = content++;\n      throw(e);\n    }\n  }\n}).observe(twiddle, {characterData: true});\n\n// use MutationObserver to get microtask async timing.\nexport function microtask(callback) {\n  queue.push(callback);\n  twiddle.textContent = content++;\n}\n\nexport const hasDocumentContains = Boolean(document.contains);\n\nexport function contains(container, node) {\n  while (node) {\n    if (node == container) {\n      return true;\n    }\n    node = node.parentNode;\n  }\n  return false;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\n// render enqueuer/flusher\nlet flushList = [];\nlet scheduled;\nexport function enqueue(callback) {\n  if (!scheduled) {\n    scheduled = true;\n    utils.microtask(flush);\n  }\n  flushList.push(callback);\n}\n\nexport function flush() {\n  scheduled = false;\n  let didFlush = Boolean(flushList.length);\n  while (flushList.length) {\n    flushList.shift()();\n  }\n  return didFlush;\n}\n\nflush['list'] = flushList;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\n\nclass AsyncObserver {\n\n  constructor() {\n    this._scheduled = false;\n    this.addedNodes = [];\n    this.removedNodes = [];\n    this.callbacks = new Set();\n  }\n\n  schedule() {\n    if (!this._scheduled) {\n      this._scheduled = true;\n      utils.microtask(() => {\n        this.flush();\n      });\n    }\n  }\n\n  flush() {\n    if (this._scheduled) {\n      this._scheduled = false;\n      let mutations = this.takeRecords();\n      if (mutations.length) {\n        this.callbacks.forEach(function(cb) {\n          cb(mutations);\n        });\n      }\n    }\n  }\n\n  takeRecords() {\n    if (this.addedNodes.length || this.removedNodes.length) {\n      let mutations = [{\n        addedNodes: this.addedNodes,\n        removedNodes: this.removedNodes\n      }];\n      this.addedNodes = [];\n      this.removedNodes = [];\n      return mutations;\n    }\n    return [];\n  }\n\n}\n\n// TODO(sorvell): consider instead polyfilling MutationObserver\n// directly so that users do not have to fork their code.\n// Supporting the entire api may be challenging: e.g. filtering out\n// removed nodes in the wrong scope and seeing non-distributing\n// subtree child mutations.\nexport let observeChildren = function(node, callback) {\n  node.__shady = node.__shady || {};\n  if (!node.__shady.observer) {\n    node.__shady.observer = new AsyncObserver();\n  }\n  node.__shady.observer.callbacks.add(callback);\n  let observer = node.__shady.observer;\n  return {\n    _callback: callback,\n    _observer: observer,\n    _node: node,\n    takeRecords() {\n      return observer.takeRecords()\n    }\n  };\n}\n\nexport let unobserveChildren = function(handle) {\n  let observer = handle && handle._observer;\n  if (observer) {\n    observer.callbacks.delete(handle._callback);\n    if (!observer.callbacks.size) {\n      handle._node.__shady.observer = null;\n    }\n  }\n}\n\nexport function filterMutations(mutations, target) {\n  /** @const {Node} */\n  const targetRootNode = target.getRootNode();\n  return mutations.map(function(mutation) {\n    /** @const {boolean} */\n    const mutationInScope = (targetRootNode === mutation.target.getRootNode());\n    if (mutationInScope && mutation.addedNodes) {\n      let nodes = Array.from(mutation.addedNodes).filter(function(n) {\n        return (targetRootNode === n.getRootNode());\n      });\n      if (nodes.length) {\n        mutation = Object.create(mutation);\n        Object.defineProperty(mutation, 'addedNodes', {\n          value: nodes,\n          configurable: true\n        });\n        return mutation;\n      }\n    } else if (mutationInScope) {\n      return mutation;\n    }\n  }).filter(function(m) { return m});\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n// Cribbed from ShadowDOM polyfill\n// https://github.com/webcomponents/webcomponentsjs/blob/master/src/ShadowDOM/wrappers/HTMLElement.js#L28\n/////////////////////////////////////////////////////////////////////////////\n// innerHTML and outerHTML\n\n// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#escapingString\nlet escapeAttrRegExp = /[&\\u00A0\"]/g;\nlet escapeDataRegExp = /[&\\u00A0<>]/g;\n\nfunction escapeReplace(c) {\n  switch (c) {\n    case '&':\n      return '&amp;';\n    case '<':\n      return '&lt;';\n    case '>':\n      return '&gt;';\n    case '\"':\n      return '&quot;';\n    case '\\u00A0':\n      return '&nbsp;';\n  }\n}\n\nfunction escapeAttr(s) {\n  return s.replace(escapeAttrRegExp, escapeReplace);\n}\n\nfunction escapeData(s) {\n  return s.replace(escapeDataRegExp, escapeReplace);\n}\n\nfunction makeSet(arr) {\n  let set = {};\n  for (let i = 0; i < arr.length; i++) {\n    set[arr[i]] = true;\n  }\n  return set;\n}\n\n// http://www.whatwg.org/specs/web-apps/current-work/#void-elements\nlet voidElements = makeSet([\n  'area',\n  'base',\n  'br',\n  'col',\n  'command',\n  'embed',\n  'hr',\n  'img',\n  'input',\n  'keygen',\n  'link',\n  'meta',\n  'param',\n  'source',\n  'track',\n  'wbr'\n]);\n\nlet plaintextParents = makeSet([\n  'style',\n  'script',\n  'xmp',\n  'iframe',\n  'noembed',\n  'noframes',\n  'plaintext',\n  'noscript'\n]);\n\n/**\n * @param {Node} node\n * @param {Node} parentNode\n * @param {Function=} callback\n */\nexport function getOuterHTML(node, parentNode, callback) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE: {\n      let tagName = node.localName;\n      let s = '<' + tagName;\n      let attrs = node.attributes;\n      for (let i = 0, attr; (attr = attrs[i]); i++) {\n        s += ' ' + attr.name + '=\"' + escapeAttr(attr.value) + '\"';\n      }\n      s += '>';\n      if (voidElements[tagName]) {\n        return s;\n      }\n      return s + getInnerHTML(node, callback) + '</' + tagName + '>';\n    }\n    case Node.TEXT_NODE: {\n      let data = /** @type {Text} */ (node).data;\n      if (parentNode && plaintextParents[parentNode.localName]) {\n        return data;\n      }\n      return escapeData(data);\n    }\n    case Node.COMMENT_NODE: {\n      return '<!--' + /** @type {Comment} */ (node).data + '-->';\n    }\n    default: {\n      window.console.error(node);\n      throw new Error('not implemented');\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Function=} callback\n */\nexport function getInnerHTML(node, callback) {\n  if (node.localName === 'template') {\n    node =  /** @type {HTMLTemplateElement} */ (node).content;\n  }\n  let s = '';\n  let c$ = callback ? callback(node) : node.childNodes;\n  for (let i=0, l=c$.length, child; (i<l) && (child=c$[i]); i++) {\n    s += getOuterHTML(child, node, callback);\n  }\n  return s;\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {getInnerHTML} from './innerHTML.js';\n\nlet nodeWalker = document.createTreeWalker(document, NodeFilter.SHOW_ALL,\n  null, false);\n\nlet elementWalker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT,\n  null, false);\n\nexport function parentNode(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.parentNode();\n}\n\nexport function firstChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.firstChild();\n}\n\nexport function lastChild(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.lastChild();\n}\n\nexport function previousSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.previousSibling();\n}\n\nexport function nextSibling(node) {\n  nodeWalker.currentNode = node;\n  return nodeWalker.nextSibling();\n}\n\nexport function childNodes(node) {\n  let nodes = [];\n  nodeWalker.currentNode = node;\n  let n = nodeWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = nodeWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function parentElement(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.parentNode();\n}\n\nexport function firstElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.firstChild();\n}\n\nexport function lastElementChild(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.lastChild();\n}\n\nexport function previousElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.previousSibling();\n}\n\nexport function nextElementSibling(node) {\n  elementWalker.currentNode = node;\n  return elementWalker.nextSibling();\n}\n\nexport function children(node) {\n  let nodes = [];\n  elementWalker.currentNode = node;\n  let n = elementWalker.firstChild();\n  while (n) {\n    nodes.push(n);\n    n = elementWalker.nextSibling();\n  }\n  return nodes;\n}\n\nexport function innerHTML(node) {\n  return getInnerHTML(node, (n) => childNodes(n));\n}\n\nexport function textContent(node) {\n  switch (node.nodeType) {\n    case Node.ELEMENT_NODE:\n    case Node.DOCUMENT_FRAGMENT_NODE:\n      let textWalker = document.createTreeWalker(node, NodeFilter.SHOW_TEXT,\n        null, false);\n      let content = '', n;\n      while ( (n = textWalker.nextNode()) ) {\n        // TODO(sorvell): can't use textContent since we patch it on Node.prototype!\n        // However, should probably patch it only on element.\n        content += n.nodeValue;\n      }\n      return content;\n    default:\n      return node.nodeValue;\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {getInnerHTML} from './innerHTML.js';\nimport * as nativeTree from './native-tree.js';\nimport {contains as nativeContains} from './native-methods.js';\n\nfunction clearNode(node) {\n  while (node.firstChild) {\n    node.removeChild(node.firstChild);\n  }\n}\n\nconst nativeInnerHTMLDesc = /** @type {ObjectPropertyDescriptor} */(\n  Object.getOwnPropertyDescriptor(Element.prototype, 'innerHTML') ||\n  Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'innerHTML'));\n\nconst inertDoc = document.implementation.createHTMLDocument('inert');\n\nconst nativeActiveElementDescriptor =\n  /** @type {ObjectPropertyDescriptor} */(\n    Object.getOwnPropertyDescriptor(Document.prototype, 'activeElement')\n  );\nfunction getDocumentActiveElement() {\n  if (nativeActiveElementDescriptor && nativeActiveElementDescriptor.get) {\n    return nativeActiveElementDescriptor.get.call(document);\n  } else if (!utils.settings.hasDescriptors) {\n    return document.activeElement;\n  }\n}\n\nfunction activeElementForNode(node) {\n  let active = getDocumentActiveElement();\n  // In IE11, activeElement might be an empty object if the document is\n  // contained in an iframe.\n  // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10998788/\n  if (!active || !active.nodeType) {\n    return null;\n  }\n  let isShadyRoot = !!(utils.isShadyRoot(node));\n  if (node !== document) {\n    // If this node isn't a document or shady root, then it doesn't have\n    // an active element.\n    if (!isShadyRoot) {\n      return null;\n    }\n    // If this shady root's host is the active element or the active\n    // element is not a descendant of the host (in the composed tree),\n    // then it doesn't have an active element.\n    if (node.host === active ||\n        !nativeContains.call(node.host, active)) {\n      return null;\n    }\n  }\n  // This node is either the document or a shady root of which the active\n  // element is a (composed) descendant of its host; iterate upwards to\n  // find the active element's most shallow host within it.\n  let activeRoot = utils.ownerShadyRootForNode(active);\n  while (activeRoot && activeRoot !== node) {\n    active = activeRoot.host;\n    activeRoot = utils.ownerShadyRootForNode(active);\n  }\n  if (node === document) {\n    // This node is the document, so activeRoot should be null.\n    return activeRoot ? null : active;\n  } else {\n    // This node is a non-document shady root, and it should be\n    // activeRoot.\n    return activeRoot === node ? active : null;\n  }\n}\n\nlet OutsideAccessors = {\n\n  parentElement: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      if (l && l.nodeType !== Node.ELEMENT_NODE) {\n        l = null;\n      }\n      return l !== undefined ? l : nativeTree.parentElement(this);\n    },\n    configurable: true\n  },\n\n  parentNode: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.parentNode;\n      return l !== undefined ? l : nativeTree.parentNode(this);\n    },\n    configurable: true\n  },\n\n  nextSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.nextSibling;\n      return l !== undefined ? l : nativeTree.nextSibling(this);\n    },\n    configurable: true\n  },\n\n  previousSibling: {\n    /** @this {Node} */\n    get() {\n      let l = this.__shady && this.__shady.previousSibling;\n      return l !== undefined ? l : nativeTree.previousSibling(this);\n    },\n    configurable: true\n  },\n\n  className: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.getAttribute('class') || '';\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(value) {\n      this.setAttribute('class', value);\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  nextElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.nextSibling !== undefined) {\n        let n = this.nextSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.nextElementSibling(this);\n      }\n    },\n    configurable: true\n  },\n\n  previousElementSibling: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.previousSibling !== undefined) {\n        let n = this.previousSibling;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.previousElementSibling(this);\n      }\n    },\n    configurable: true\n  }\n\n};\n\nlet InsideAccessors = {\n\n  childNodes: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let childNodes;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        if (!this.__shady.childNodes) {\n          this.__shady.childNodes = [];\n          for (let n=this.firstChild; n; n=n.nextSibling) {\n            this.__shady.childNodes.push(n);\n          }\n        }\n        childNodes = this.__shady.childNodes;\n      } else {\n        childNodes = nativeTree.childNodes(this);\n      }\n      childNodes.item = function(index) {\n        return childNodes[index];\n      }\n      return childNodes;\n    },\n    configurable: true\n  },\n\n  childElementCount: {\n    /** @this {HTMLElement} */\n    get() {\n      return this.children.length;\n    },\n    configurable: true\n  },\n\n  firstChild: {\n    /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.firstChild;\n      return l !== undefined ? l : nativeTree.firstChild(this);\n    },\n    configurable: true\n  },\n\n  lastChild: {\n  /** @this {HTMLElement} */\n    get() {\n      let l = this.__shady && this.__shady.lastChild;\n      return l !== undefined ? l : nativeTree.lastChild(this);\n    },\n    configurable: true\n  },\n\n  textContent: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        let tc = [];\n        for (let i = 0, cn = this.childNodes, c; (c = cn[i]); i++) {\n          if (c.nodeType !== Node.COMMENT_NODE) {\n            tc.push(c.textContent);\n          }\n        }\n        return tc.join('');\n      } else {\n        return nativeTree.textContent(this);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     * @param {string} text\n     */\n    set(text) {\n      if (typeof text === 'undefined' || text === null) {\n        text = ''\n      }\n      switch (this.nodeType) {\n        case Node.ELEMENT_NODE:\n        case Node.DOCUMENT_FRAGMENT_NODE:\n          clearNode(this);\n          // Document fragments must have no childnodes if setting a blank string\n          if (text.length > 0 || this.nodeType === Node.ELEMENT_NODE) {\n            this.appendChild(document.createTextNode(text));\n          }\n          break;\n        default:\n          // TODO(sorvell): can't do this if patch nodeValue.\n          this.nodeValue = text;\n          break;\n      }\n    },\n    configurable: true\n  },\n\n  // fragment, element, document\n  firstElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.firstChild !== undefined) {\n        let n = this.firstChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.nextSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.firstElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  lastElementChild: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      if (this.__shady && this.__shady.lastChild !== undefined) {\n        let n = this.lastChild;\n        while (n && n.nodeType !== Node.ELEMENT_NODE) {\n          n = n.previousSibling;\n        }\n        return n;\n      } else {\n        return nativeTree.lastElementChild(this);\n      }\n    },\n    configurable: true\n  },\n\n  children: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      let children;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        children = Array.prototype.filter.call(this.childNodes, function(n) {\n          return (n.nodeType === Node.ELEMENT_NODE);\n        });\n      } else {\n        children = nativeTree.children(this);\n      }\n      children.item = function(index) {\n        return children[index];\n      }\n      return children;\n    },\n    configurable: true\n  },\n\n  // element (HTMLElement on IE11)\n  innerHTML: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      const content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      if (utils.isTrackingLogicalChildNodes(this)) {\n        return getInnerHTML(content);\n      } else {\n        return nativeTree.innerHTML(content);\n      }\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set(text) {\n      const content = this.localName === 'template' ?\n        /** @type {HTMLTemplateElement} */(this).content : this;\n      clearNode(content);\n      let containerName = this.localName;\n      if (!containerName || containerName === 'template') {\n        containerName = 'div';\n      }\n      const htmlContainer = inertDoc.createElement(containerName);\n      if (nativeInnerHTMLDesc && nativeInnerHTMLDesc.set) {\n        nativeInnerHTMLDesc.set.call(htmlContainer, text);\n      } else {\n        htmlContainer.innerHTML = text;\n      }\n      while (htmlContainer.firstChild) {\n        content.appendChild(htmlContainer.firstChild);\n      }\n    },\n    configurable: true\n  }\n\n};\n\n// Note: Can be patched on element prototype on all browsers.\n// Must be patched on instance on browsers that support native Shadow DOM\n// but do not have builtin accessors (old Chrome).\nexport let ShadowRootAccessor = {\n\n  shadowRoot: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return this.__shady && this.__shady.publicRoot || null;\n    },\n    configurable: true\n  }\n};\n\n// Note: Can be patched on document prototype on browsers with builtin accessors.\n// Must be patched separately on simulated ShadowRoot.\n// Must be patched as `_activeElement` on browsers without builtin accessors.\nexport let ActiveElementAccessor = {\n\n  activeElement: {\n    /**\n     * @this {HTMLElement}\n     */\n    get() {\n      return activeElementForNode(this);\n    },\n    /**\n     * @this {HTMLElement}\n     */\n    set() {},\n    configurable: true\n  }\n\n};\n\n// patch a group of descriptors on an object only if it exists or if the `force`\n// argument is true.\n/**\n * @param {!Object} obj\n * @param {!Object} descriptors\n * @param {boolean=} force\n */\nfunction patchAccessorGroup(obj, descriptors, force) {\n  for (let p in descriptors) {\n    let objDesc = Object.getOwnPropertyDescriptor(obj, p);\n    if ((objDesc && objDesc.configurable) ||\n      (!objDesc && force)) {\n      Object.defineProperty(obj, p, descriptors[p]);\n    } else if (force) {\n      console.warn('Could not define', p, 'on', obj);\n    }\n  }\n}\n\n// patch dom accessors on proto where they exist\nexport function patchAccessors(proto) {\n  patchAccessorGroup(proto, OutsideAccessors);\n  patchAccessorGroup(proto, InsideAccessors);\n  patchAccessorGroup(proto, ActiveElementAccessor);\n}\n\n// ensure element descriptors (IE/Edge don't have em)\nexport function patchShadowRootAccessors(proto) {\n  patchAccessorGroup(proto, InsideAccessors, true);\n  patchAccessorGroup(proto, ActiveElementAccessor, true);\n}\n\n// ensure an element has patched \"outside\" accessors; no-op when not needed\nexport let patchOutsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__outsideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__outsideAccessors = true;\n      patchAccessorGroup(element, OutsideAccessors, true);\n    }\n  }\n\n// ensure an element has patched \"inside\" accessors; no-op when not needed\nexport let patchInsideElementAccessors = utils.settings.hasDescriptors ?\n  function() {} : function(element) {\n    if (!(element.__shady && element.__shady.__insideAccessors)) {\n      element.__shady = element.__shady || {};\n      element.__shady.__insideAccessors = true;\n      patchAccessorGroup(element, InsideAccessors, true);\n      patchAccessorGroup(element, ShadowRootAccessor, true);\n    }\n  }\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-accessors.js';\nimport {firstChild, lastChild, childNodes} from './native-tree.js';\n\nexport function recordInsertBefore(node, container, ref_node) {\n  patchInsideElementAccessors(container);\n  container.__shady = container.__shady || {};\n  if (container.__shady.firstChild !== undefined) {\n    container.__shady.childNodes = null;\n  }\n  // handle document fragments\n  if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n    let c$ = node.childNodes;\n    for (let i=0; i < c$.length; i++) {\n      linkNode(c$[i], container, ref_node);\n    }\n    // cleanup logical dom in doc fragment.\n    node.__shady = node.__shady || {};\n    let resetTo = (node.__shady.firstChild !== undefined) ? null : undefined;\n    node.__shady.firstChild = node.__shady.lastChild = resetTo;\n    node.__shady.childNodes = resetTo;\n  } else {\n    linkNode(node, container, ref_node);\n  }\n}\n\nfunction linkNode(node, container, ref_node) {\n  patchOutsideElementAccessors(node);\n  ref_node = ref_node || null;\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (ref_node) {\n    ref_node.__shady = ref_node.__shady || {};\n  }\n  // update ref_node.previousSibling <-> node\n  node.__shady.previousSibling = ref_node ? ref_node.__shady.previousSibling :\n    container.lastChild;\n  let ps = node.__shady.previousSibling;\n  if (ps && ps.__shady) {\n    ps.__shady.nextSibling = node;\n  }\n  // update node <-> ref_node\n  let ns = node.__shady.nextSibling = ref_node;\n  if (ns && ns.__shady) {\n    ns.__shady.previousSibling = node;\n  }\n  // update node <-> container\n  node.__shady.parentNode = container;\n  if (ref_node) {\n    if (ref_node === container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  } else {\n    container.__shady.lastChild = node;\n    if (!container.__shady.firstChild) {\n      container.__shady.firstChild = node;\n    }\n  }\n  // remove caching of childNodes\n  container.__shady.childNodes = null;\n}\n\nexport function recordRemoveChild(node, container) {\n  node.__shady = node.__shady || {};\n  container.__shady = container.__shady || {};\n  if (node === container.__shady.firstChild) {\n    container.__shady.firstChild = node.__shady.nextSibling;\n  }\n  if (node === container.__shady.lastChild) {\n    container.__shady.lastChild = node.__shady.previousSibling;\n  }\n  let p = node.__shady.previousSibling;\n  let n = node.__shady.nextSibling;\n  if (p) {\n    p.__shady = p.__shady || {};\n    p.__shady.nextSibling = n;\n  }\n  if (n) {\n    n.__shady = n.__shady || {};\n    n.__shady.previousSibling = p;\n  }\n  // When an element is removed, logical data is no longer tracked.\n  // Explicitly set `undefined` here to indicate this. This is disginguished\n  // from `null` which is set if info is null.\n  node.__shady.parentNode = node.__shady.previousSibling =\n    node.__shady.nextSibling = undefined;\n  if (container.__shady.childNodes !== undefined) {\n    // remove caching of childNodes\n    container.__shady.childNodes = null;\n  }\n}\n\nexport let recordChildNodes = function(node) {\n  if (!node.__shady || node.__shady.firstChild === undefined) {\n    node.__shady = node.__shady || {};\n    node.__shady.firstChild = firstChild(node);\n    node.__shady.lastChild = lastChild(node);\n    patchInsideElementAccessors(node);\n    let c$ = node.__shady.childNodes = childNodes(node);\n    for (let i=0, n; (i<c$.length) && (n=c$[i]); i++) {\n      n.__shady = n.__shady || {};\n      n.__shady.parentNode = node;\n      n.__shady.nextSibling = c$[i+1] || null;\n      n.__shady.previousSibling = c$[i-1] || null;\n      patchOutsideElementAccessors(n);\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as logicalTree from './logical-tree.js';\nimport * as nativeMethods from './native-methods.js';\nimport {parentNode} from './native-tree.js';\n\n// Patched `insertBefore`. Note that all mutations that add nodes are routed\n// here. When a <slot> is added or a node is added to a host with a shadowRoot\n// with a slot, a standard dom `insert` call is aborted and `_asyncRender`\n// is called on the relevant shadowRoot. In all other cases, a standard dom\n// `insert` can be made, but the location and ref_node may need to be changed.\n/**\n * @param {Node} parent\n * @param {Node} node\n * @param {Node=} ref_node\n */\nexport function insertBefore(parent, node, ref_node) {\n  if (node === parent) {\n    throw Error(`Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`);\n  }\n  if (ref_node) {\n    let p = ref_node.__shady && ref_node.__shady.parentNode;\n    if ((p !== undefined && p !== parent) ||\n      (p === undefined && parentNode(ref_node) !== parent)) {\n      throw Error(`Failed to execute 'insertBefore' on 'Node': The node ` +\n       `before which the new node is to be inserted is not a child of this node.`);\n    }\n  }\n  if (ref_node === node) {\n    return node;\n  }\n  // remove from existing location\n  if (node.parentNode) {\n    // NOTE: avoid node.removeChild as this *can* trigger another patched\n    // method (e.g. custom elements) and we want only the shady method to run.\n    removeChild(node.parentNode, node);\n  }\n  // add to new parent\n  let preventNativeInsert;\n  let ownerRoot = utils.ownerShadyRootForNode(parent);\n  // if a slot is added, must render containing root.\n  let slotsAdded = ownerRoot && findContainedSlots(node);\n  if (slotsAdded) {\n    ownerRoot._addSlots(slotsAdded);\n  }\n  if (ownerRoot && (parent.localName === 'slot' || slotsAdded)) {\n    ownerRoot._asyncRender();\n  }\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordInsertBefore(node, parent, ref_node);\n    // when inserting into a host with a shadowRoot with slot, use\n    // `shadowRoot._asyncRender()` via `attach-shadow` module\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeInsert = true;\n    // when inserting into a host with shadowRoot with NO slot, do nothing\n    // as the node should not be added to composed dome anywhere.\n    } else if (parent.__shady.root) {\n      preventNativeInsert = true;\n    }\n  }\n  if (!preventNativeInsert) {\n    // if adding to a shadyRoot, add to host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host : parent;\n    // if ref_node, get the ref_node that's actually in composed dom.\n    if (ref_node) {\n      ref_node = firstComposedNode(ref_node);\n      nativeMethods.insertBefore.call(container, node, ref_node);\n    } else {\n      nativeMethods.appendChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, node);\n  return node;\n}\n\nfunction findContainedSlots(node) {\n  if (!node['__noInsertionPoint']) {\n    let slots;\n    if (node.localName === 'slot') {\n      slots = [node];\n    } else if (node.querySelectorAll) {\n      slots = node.querySelectorAll('slot');\n    }\n    if (slots && slots.length) {\n      return slots;\n    }\n  }\n}\n\n/**\n * Patched `removeChild`. Note that all dom \"removals\" are routed here.\n * Removes the given `node` from the element's `children`.\n * This method also performs dom composition.\n * @param {Node} parent\n * @param {Node} node\n*/\nexport function removeChild(parent, node) {\n  if (node.parentNode !== parent) {\n    throw Error('The node to be removed is not a child of this node: ' +\n      node);\n  }\n  let preventNativeRemove;\n  let ownerRoot = utils.ownerShadyRootForNode(node);\n  let removingInsertionPoint;\n  if (utils.isTrackingLogicalChildNodes(parent)) {\n    logicalTree.recordRemoveChild(node, parent);\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n      preventNativeRemove = true;\n    }\n  }\n  removeOwnerShadyRoot(node);\n  // if removing slot, must render containing root\n  if (ownerRoot) {\n    let changeSlotContent = parent && parent.localName === 'slot';\n    if (changeSlotContent) {\n      preventNativeRemove = true;\n    }\n    removingInsertionPoint = ownerRoot._removeContainedSlots(node);\n    if (removingInsertionPoint || changeSlotContent) {\n      ownerRoot._asyncRender();\n    }\n  }\n  if (!preventNativeRemove) {\n    // if removing from a shadyRoot, remove form host instead\n    let container = utils.isShadyRoot(parent) ?\n      /** @type {ShadowRoot} */(parent).host :\n      parent;\n    // not guaranteed to physically be in container; e.g.\n    // (1) if parent has a shadyRoot, element may or may not at distributed\n    // location (could be undistributed)\n    // (2) if parent is a slot, element may not ben in composed dom\n    if (!(parent.__shady.root || node.localName === 'slot') ||\n      (container === parentNode(node))) {\n      nativeMethods.removeChild.call(container, node);\n    }\n  }\n  scheduleObserver(parent, null, node);\n  return node;\n}\n\nfunction removeOwnerShadyRoot(node) {\n  // optimization: only reset the tree if node is actually in a root\n  if (hasCachedOwnerRoot(node)) {\n    let c$ = node.childNodes;\n    for (let i=0, l=c$.length, n; (i<l) && (n=c$[i]); i++) {\n      removeOwnerShadyRoot(n);\n    }\n  }\n  if (node.__shady) {\n    node.__shady.ownerShadyRoot = undefined;\n  }\n}\n\nfunction hasCachedOwnerRoot(node) {\n  return Boolean(node.__shady && node.__shady.ownerShadyRoot !== undefined);\n}\n\n/**\n * Finds the first flattened node that is composed in the node's parent.\n * If the given node is a slot, then the first flattened node is returned\n * if it exists, otherwise advance to the node's nextSibling.\n * @param {Node} node within which to find first composed node\n * @returns {Node} first composed node\n */\nfunction firstComposedNode(node) {\n  let composed = node;\n  if (node && node.localName === 'slot') {\n    let flattened = node.__shady && node.__shady.flattenedNodes;\n    composed = flattened && flattened.length ? flattened[0] :\n      firstComposedNode(node.nextSibling);\n  }\n  return composed;\n}\n\nfunction hasShadowRootWithSlot(node) {\n  let root = node && node.__shady && node.__shady.root;\n  return (root && root._hasInsertionPoint());\n}\n\n/**\n * Should be called whenever an attribute changes. If the `slot` attribute\n * changes, provokes rendering if necessary. If a `<slot>` element's `name`\n * attribute changes, updates the root's slot map and renders.\n * @param {Node} node\n * @param {string} name\n */\nfunction distributeAttributeChange(node, name) {\n  if (name === 'slot') {\n    const parent = node.parentNode;\n    if (hasShadowRootWithSlot(parent)) {\n      parent.__shady.root._asyncRender();\n    }\n  } else if (node.localName === 'slot' && name === 'name') {\n    let root = utils.ownerShadyRootForNode(node);\n    if (root) {\n      root._updateSlotName(node);\n      root._asyncRender();\n    }\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Node=} addedNode\n * @param {Node=} removedNode\n */\nfunction scheduleObserver(node, addedNode, removedNode) {\n  let observer = node.__shady && node.__shady.observer;\n  if (observer) {\n    if (addedNode) {\n      observer.addedNodes.push(addedNode);\n    }\n    if (removedNode) {\n      observer.removedNodes.push(removedNode);\n    }\n    observer.schedule();\n  }\n}\n\n/**\n * @param {Node} node\n * @param {Object=} options\n */\nexport function getRootNode(node, options) { // eslint-disable-line no-unused-vars\n  if (!node || !node.nodeType) {\n    return;\n  }\n  node.__shady = node.__shady || {};\n  let root = node.__shady.ownerShadyRoot;\n  if (root === undefined) {\n    if (utils.isShadyRoot(node)) {\n      root = node;\n    } else {\n      let parent = node.parentNode;\n      root = parent ? getRootNode(parent) : node;\n    }\n    // memo-ize result for performance but only memo-ize\n    // result if node is in the document. This avoids a problem where a root\n    // can be cached while an element is inside a fragment.\n    // If this happens and we cache the result, the value can become stale\n    // because for perf we avoid processing the subtree of added fragments.\n    if (nativeMethods.contains.call(document.documentElement, node)) {\n      node.__shady.ownerShadyRoot = root;\n    }\n  }\n  return root;\n}\n\n// NOTE: `query` is used primarily for ShadyDOM's querySelector impl,\n// but it's also generally useful to recurse through the element tree\n// and is used by Polymer's styling system.\n/**\n * @param {Node} node\n * @param {Function} matcher\n * @param {Function=} halter\n */\nexport function query(node, matcher, halter) {\n  let list = [];\n  queryElements(node.childNodes, matcher,\n    halter, list);\n  return list;\n}\n\nfunction queryElements(elements, matcher, halter, list) {\n  for (let i=0, l=elements.length, c; (i<l) && (c=elements[i]); i++) {\n    if (c.nodeType === Node.ELEMENT_NODE &&\n        queryElement(c, matcher, halter, list)) {\n      return true;\n    }\n  }\n}\n\nfunction queryElement(node, matcher, halter, list) {\n  let result = matcher(node);\n  if (result) {\n    list.push(node);\n  }\n  if (halter && halter(result)) {\n    return result;\n  }\n  queryElements(node.childNodes, matcher,\n    halter, list);\n}\n\nexport function renderRootNode(element) {\n  var root = element.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    root._render();\n  }\n}\n\nlet scopingShim = null;\n\nexport function setAttribute(node, attr, value) {\n  if (!scopingShim) {\n    scopingShim = window['ShadyCSS'] && window['ShadyCSS']['ScopingShim'];\n  }\n  if (scopingShim && attr === 'class') {\n    scopingShim['setElementClass'](node, value);\n  } else {\n    nativeMethods.setAttribute.call(node, attr, value);\n    distributeAttributeChange(node, attr);\n  }\n}\n\nexport function removeAttribute(node, attr) {\n  nativeMethods.removeAttribute.call(node, attr);\n  distributeAttributeChange(node, attr);\n}\n\nexport function cloneNode(node, deep) {\n  if (node.localName == 'template') {\n    return nativeMethods.cloneNode.call(node, deep);\n  } else {\n    let n = nativeMethods.cloneNode.call(node, false);\n    if (deep) {\n      let c$ = node.childNodes;\n      for (let i=0, nc; i < c$.length; i++) {\n        nc = c$[i].cloneNode(true);\n        n.appendChild(nc);\n      }\n    }\n    return n;\n  }\n}\n\n// note: Though not technically correct, we fast path `importNode`\n// when called on a node not owned by the main document.\n// This allows, for example, elements that cannot\n// contain custom elements and are therefore not likely to contain shadowRoots\n// to cloned natively. This is a fairly significant performance win.\nexport function importNode(node, deep) {\n  if (node.ownerDocument !== document) {\n    return nativeMethods.importNode.call(document, node, deep);\n  }\n  let n = nativeMethods.importNode.call(document, node, false);\n  if (deep) {\n    let c$ = node.childNodes;\n    for (let i=0, nc; i < c$.length; i++) {\n      nc = importNode(c$[i], true);\n      n.appendChild(nc);\n    }\n  }\n  return n;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport * as nativeMethods from './native-methods.js';\n\n/*\nMake this name unique so it is unlikely to conflict with properties on objects passed to `addEventListener`\nhttps://github.com/webcomponents/shadydom/issues/173\n*/\nconst /** string */ eventWrappersName = `__eventWrappers${Date.now()}`;\n\n// https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937\nlet alwaysComposed = {\n  'blur': true,\n  'focus': true,\n  'focusin': true,\n  'focusout': true,\n  'click': true,\n  'dblclick': true,\n  'mousedown': true,\n  'mouseenter': true,\n  'mouseleave': true,\n  'mousemove': true,\n  'mouseout': true,\n  'mouseover': true,\n  'mouseup': true,\n  'wheel': true,\n  'beforeinput': true,\n  'input': true,\n  'keydown': true,\n  'keyup': true,\n  'compositionstart': true,\n  'compositionupdate': true,\n  'compositionend': true,\n  'touchstart': true,\n  'touchend': true,\n  'touchmove': true,\n  'touchcancel': true,\n  'pointerover': true,\n  'pointerenter': true,\n  'pointerdown': true,\n  'pointermove': true,\n  'pointerup': true,\n  'pointercancel': true,\n  'pointerout': true,\n  'pointerleave': true,\n  'gotpointercapture': true,\n  'lostpointercapture': true,\n  'dragstart': true,\n  'drag': true,\n  'dragenter': true,\n  'dragleave': true,\n  'dragover': true,\n  'drop': true,\n  'dragend': true,\n  'DOMActivate': true,\n  'DOMFocusIn': true,\n  'DOMFocusOut': true,\n  'keypress': true\n};\n\nfunction pathComposer(startNode, composed) {\n  let composedPath = [];\n  let current = startNode;\n  let startRoot = startNode === window ? window : startNode.getRootNode();\n  while (current) {\n    composedPath.push(current);\n    if (current.assignedSlot) {\n      current = current.assignedSlot;\n    } else if (current.nodeType === Node.DOCUMENT_FRAGMENT_NODE && current.host && (composed || current !== startRoot)) {\n      current = current.host;\n    } else {\n      current = current.parentNode;\n    }\n  }\n  // event composedPath includes window when startNode's ownerRoot is document\n  if (composedPath[composedPath.length - 1] === document) {\n    composedPath.push(window);\n  }\n  return composedPath;\n}\n\nfunction retarget(refNode, path) {\n  if (!utils.isShadyRoot) {\n    return refNode;\n  }\n  // If ANCESTOR's root is not a shadow root or ANCESTOR's root is BASE's\n  // shadow-including inclusive ancestor, return ANCESTOR.\n  let refNodePath = pathComposer(refNode, true);\n  let p$ = path;\n  for (let i=0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {\n    ancestor = p$[i];\n    root = ancestor === window ? window : ancestor.getRootNode();\n    if (root !== lastRoot) {\n      rootIdx = refNodePath.indexOf(root);\n      lastRoot = root;\n    }\n    if (!utils.isShadyRoot(root) || rootIdx > -1) {\n      return ancestor;\n    }\n  }\n}\n\nlet eventMixin = {\n\n  /**\n   * @this {Event}\n   */\n  get composed() {\n    // isTrusted may not exist in this browser, so just check if isTrusted is explicitly false\n    if (this.isTrusted !== false && this.__composed === undefined) {\n      this.__composed = alwaysComposed[this.type];\n    }\n    return this.__composed || false;\n  },\n\n  /**\n   * @this {Event}\n   */\n  composedPath() {\n    if (!this.__composedPath) {\n      this.__composedPath = pathComposer(this['__target'], this.composed);\n    }\n    return this.__composedPath;\n  },\n\n  /**\n   * @this {Event}\n   */\n  get target() {\n    return retarget(this.currentTarget, this.composedPath());\n  },\n\n  // http://w3c.github.io/webcomponents/spec/shadow/#event-relatedtarget-retargeting\n  /**\n   * @this {Event}\n   */\n  get relatedTarget() {\n    if (!this.__relatedTarget) {\n      return null;\n    }\n    if (!this.__relatedTargetComposedPath) {\n      this.__relatedTargetComposedPath = pathComposer(this.__relatedTarget, true);\n    }\n    // find the deepest node in relatedTarget composed path that is in the same root with the currentTarget\n    return retarget(this.currentTarget, this.__relatedTargetComposedPath);\n  },\n  /**\n   * @this {Event}\n   */\n  stopPropagation() {\n    Event.prototype.stopPropagation.call(this);\n    this.__propagationStopped = true;\n  },\n  /**\n   * @this {Event}\n   */\n  stopImmediatePropagation() {\n    Event.prototype.stopImmediatePropagation.call(this);\n    this.__immediatePropagationStopped = true;\n    this.__propagationStopped = true;\n  }\n\n};\n\nfunction mixinComposedFlag(Base) {\n  // NOTE: avoiding use of `class` here so that transpiled output does not\n  // try to do `Base.call` with a dom construtor.\n  let klazz = function(type, options) {\n    let event = new Base(type, options);\n    event.__composed = options && Boolean(options['composed']);\n    return event;\n  }\n  // put constructor properties on subclass\n  utils.mixin(klazz, Base);\n  klazz.prototype = Base.prototype;\n  return klazz;\n}\n\nlet nonBubblingEventsToRetarget = {\n  'focus': true,\n  'blur': true\n};\n\n\n/**\n * Check if the event has been retargeted by comparing original `target`, and calculated `target`\n * @param {Event} event\n * @return {boolean} True if the original target and calculated target are the same\n */\nfunction hasRetargeted(event) {\n  return event['__target'] !== event.target || event.__relatedTarget !== event.relatedTarget;\n}\n\n/**\n *\n * @param {Event} event\n * @param {Node} node\n * @param {string} phase\n */\nfunction fireHandlers(event, node, phase) {\n  let hs = node.__handlers && node.__handlers[event.type] &&\n    node.__handlers[event.type][phase];\n  if (hs) {\n    for (let i = 0, fn; (fn = hs[i]); i++) {\n      if (hasRetargeted(event) && event.target === event.relatedTarget) {\n        return;\n      }\n      fn.call(node, event);\n      if (event.__immediatePropagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction retargetNonBubblingEvent(e) {\n  let path = e.composedPath();\n  let node;\n  // override `currentTarget` to let patched `target` calculate correctly\n  Object.defineProperty(e, 'currentTarget', {\n    get: function() {\n      return node;\n    },\n    configurable: true\n  });\n  for (let i = path.length - 1; i >= 0; i--) {\n    node = path[i];\n    // capture phase fires all capture handlers\n    fireHandlers(e, node, 'capture');\n    if (e.__propagationStopped) {\n      return;\n    }\n  }\n\n  // set the event phase to `AT_TARGET` as in spec\n  Object.defineProperty(e, 'eventPhase', {get() { return Event.AT_TARGET }});\n\n  // the event only needs to be fired when owner roots change when iterating the event path\n  // keep track of the last seen owner root\n  let lastFiredRoot;\n  for (let i = 0; i < path.length; i++) {\n    node = path[i];\n    const root = node.__shady && node.__shady.root;\n    if (i === 0 || (root && root === lastFiredRoot)) {\n      fireHandlers(e, node, 'bubble');\n      // don't bother with window, it doesn't have `getRootNode` and will be last in the path anyway\n      if (node !== window) {\n        lastFiredRoot = node.getRootNode();\n      }\n      if (e.__propagationStopped) {\n        return;\n      }\n    }\n  }\n}\n\nfunction listenerSettingsEqual(savedListener, node, type, capture, once, passive) {\n  let {\n    node: savedNode,\n    type: savedType,\n    capture: savedCapture,\n    once: savedOnce,\n    passive: savedPassive\n  } = savedListener;\n  return node === savedNode &&\n    type === savedType &&\n    capture === savedCapture &&\n    once === savedOnce &&\n    passive === savedPassive;\n}\n\nexport function findListener(wrappers, node, type, capture, once, passive) {\n  for (let i = 0; i < wrappers.length; i++) {\n    if (listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)) {\n      return i;\n    }\n  }\n  return -1;\n}\n\n/**\n * Firefox can throw on accessing eventWrappers inside of `removeEventListener` during a selenium run\n * Try/Catch accessing eventWrappers to work around\n * https://bugzilla.mozilla.org/show_bug.cgi?id=1353074\n */\nfunction getEventWrappers(eventLike) {\n  let wrappers = null;\n  try {\n    wrappers = eventLike[eventWrappersName];\n  } catch (e) {} // eslint-disable-line no-empty\n  return wrappers;\n}\n\n/**\n * @this {Event}\n */\nexport function addEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  const handlerType = typeof fnOrObj;\n\n  // bail if `fnOrObj` is not a function, not an object\n  if (handlerType !== 'function' && handlerType !== 'object') {\n    return;\n  }\n\n  // bail if `fnOrObj` is an object without a `handleEvent` method\n  if (handlerType === 'object' && (!fnOrObj.handleEvent || typeof fnOrObj.handleEvent !== 'function')) {\n    return;\n  }\n\n  // The callback `fn` might be used for multiple nodes/events. Since we generate\n  // a wrapper function, we need to keep track of it when we remove the listener.\n  // It's more efficient to store the node/type/options information as Array in\n  // `fn` itself rather than the node (we assume that the same callback is used\n  // for few nodes at most, whereas a node will likely have many event listeners).\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (optionsOrCapture && typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  // hack to let ShadyRoots have event listeners\n  // event listener will be on host, but `currentTarget`\n  // will be set to shadyroot for event listener\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n\n  let wrappers = fnOrObj[eventWrappersName];\n  if (wrappers) {\n    // Stop if the wrapper function has already been created.\n    if (findListener(wrappers, target, type, capture, once, passive) > -1) {\n      return;\n    }\n  } else {\n    fnOrObj[eventWrappersName] = [];\n  }\n\n  /**\n   * @this {HTMLElement}\n   * @param {Event} e\n   */\n  const wrapperFn = function(e) {\n    // Support `once` option.\n    if (once) {\n      this.removeEventListener(type, fnOrObj, optionsOrCapture);\n    }\n    if (!e['__target']) {\n      patchEvent(e);\n    }\n    let lastCurrentTargetDesc;\n    if (target !== this) {\n      // replace `currentTarget` to make `target` and `relatedTarget` correct for inside the shadowroot\n      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(e, 'currentTarget');\n      Object.defineProperty(e, 'currentTarget', {get() { return target }, configurable: true});\n    }\n    // There are two critera that should stop events from firing on this node\n    // 1. the event is not composed and the current node is not in the same root as the target\n    // 2. when bubbling, if after retargeting, relatedTarget and target point to the same node\n    if (e.composed || e.composedPath().indexOf(target) > -1) {\n      if (hasRetargeted(e) && e.target === e.relatedTarget) {\n        if (e.eventPhase === Event.BUBBLING_PHASE) {\n          e.stopImmediatePropagation();\n        }\n        return;\n      }\n      // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase\n      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target && !(target instanceof Window)) {\n        return;\n      }\n      let ret = handlerType === 'function' ?\n        fnOrObj.call(target, e) :\n        (fnOrObj.handleEvent && fnOrObj.handleEvent(e));\n      if (target !== this) {\n        // replace the \"correct\" `currentTarget`\n        if (lastCurrentTargetDesc) {\n          Object.defineProperty(e, 'currentTarget', lastCurrentTargetDesc);\n          lastCurrentTargetDesc = null;\n        } else {\n          delete e['currentTarget'];\n        }\n      }\n      return ret;\n    }\n  };\n  // Store the wrapper information.\n  fnOrObj[eventWrappersName].push({\n    node: this,\n    type: type,\n    capture: capture,\n    once: once,\n    passive: passive,\n    wrapperFn: wrapperFn\n  });\n\n  if (nonBubblingEventsToRetarget[type]) {\n    this.__handlers = this.__handlers || {};\n    this.__handlers[type] = this.__handlers[type] ||\n      {'capture': [], 'bubble': []};\n    this.__handlers[type][capture ? 'capture' : 'bubble'].push(wrapperFn);\n  } else {\n    let ael = this instanceof Window ? nativeMethods.windowAddEventListener :\n      nativeMethods.addEventListener;\n    ael.call(this, type, wrapperFn, optionsOrCapture);\n  }\n}\n\n/**\n * @this {Event}\n */\nexport function removeEventListener(type, fnOrObj, optionsOrCapture) {\n  if (!fnOrObj) {\n    return;\n  }\n\n  // NOTE(valdrin) invoking external functions is costly, inline has better perf.\n  let capture, once, passive;\n  if (optionsOrCapture && typeof optionsOrCapture === 'object') {\n    capture = Boolean(optionsOrCapture.capture);\n    once = Boolean(optionsOrCapture.once);\n    passive = Boolean(optionsOrCapture.passive);\n  } else {\n    capture = Boolean(optionsOrCapture);\n    once = false;\n    passive = false;\n  }\n  let target = (optionsOrCapture && optionsOrCapture.__shadyTarget) || this;\n  // Search the wrapped function.\n  let wrapperFn = undefined;\n  let wrappers = getEventWrappers(fnOrObj);\n  if (wrappers) {\n    let idx = findListener(wrappers, target, type, capture, once, passive);\n    if (idx > -1) {\n      wrapperFn = wrappers.splice(idx, 1)[0].wrapperFn;\n      // Cleanup.\n      if (!wrappers.length) {\n        fnOrObj[eventWrappersName] = undefined;\n      }\n    }\n  }\n  let rel = this instanceof Window ? nativeMethods.windowRemoveEventListener :\n    nativeMethods.removeEventListener;\n  rel.call(this, type, wrapperFn || fnOrObj, optionsOrCapture);\n  if (wrapperFn && nonBubblingEventsToRetarget[type] &&\n      this.__handlers && this.__handlers[type]) {\n    const arr = this.__handlers[type][capture ? 'capture' : 'bubble'];\n    const idx = arr.indexOf(wrapperFn);\n    if (idx > -1) {\n      arr.splice(idx, 1);\n    }\n  }\n}\n\nfunction activateFocusEventOverrides() {\n  for (let ev in nonBubblingEventsToRetarget) {\n    window.addEventListener(ev, function(e) {\n      if (!e['__target']) {\n        patchEvent(e);\n        retargetNonBubblingEvent(e);\n      }\n    }, true);\n  }\n}\n\nfunction patchEvent(event) {\n  event['__target'] = event.target;\n  event.__relatedTarget = event.relatedTarget;\n  // patch event prototype if we can\n  if (utils.settings.hasDescriptors) {\n    utils.patchPrototype(event, eventMixin);\n  // and fallback to patching instance\n  } else {\n    utils.extend(event, eventMixin);\n  }\n}\n\nlet PatchedEvent = mixinComposedFlag(window.Event);\nlet PatchedCustomEvent = mixinComposedFlag(window.CustomEvent);\nlet PatchedMouseEvent = mixinComposedFlag(window.MouseEvent);\n\nexport function patchEvents() {\n  window.Event = PatchedEvent;\n  window.CustomEvent = PatchedCustomEvent;\n  window.MouseEvent = PatchedMouseEvent;\n  activateFocusEventOverrides();\n}\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nfunction newSplice(index, removed, addedCount) {\n  return {\n    index: index,\n    removed: removed,\n    addedCount: addedCount\n  };\n}\n\nconst EDIT_LEAVE = 0;\nconst EDIT_UPDATE = 1;\nconst EDIT_ADD = 2;\nconst EDIT_DELETE = 3;\n\n// Note: This function is *based* on the computation of the Levenshtein\n// \"edit\" distance. The one change is that \"updates\" are treated as two\n// edits - not one. With Array splices, an update is really a delete\n// followed by an add. By retaining this, we optimize for \"keeping\" the\n// maximum array items in the original array. For example:\n//\n//   'xxxx123' -> '123yyyy'\n//\n// With 1-edit updates, the shortest path would be just to update all seven\n// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This\n// leaves the substring '123' intact.\nfunction calcEditDistances(current, currentStart, currentEnd,\n                            old, oldStart, oldEnd) {\n  // \"Deletion\" columns\n  let rowCount = oldEnd - oldStart + 1;\n  let columnCount = currentEnd - currentStart + 1;\n  let distances = new Array(rowCount);\n\n  // \"Addition\" rows. Initialize null column.\n  for (let i = 0; i < rowCount; i++) {\n    distances[i] = new Array(columnCount);\n    distances[i][0] = i;\n  }\n\n  // Initialize null row\n  for (let j = 0; j < columnCount; j++)\n    distances[0][j] = j;\n\n  for (let i = 1; i < rowCount; i++) {\n    for (let j = 1; j < columnCount; j++) {\n      if (equals(current[currentStart + j - 1], old[oldStart + i - 1]))\n        distances[i][j] = distances[i - 1][j - 1];\n      else {\n        let north = distances[i - 1][j] + 1;\n        let west = distances[i][j - 1] + 1;\n        distances[i][j] = north < west ? north : west;\n      }\n    }\n  }\n\n  return distances;\n}\n\n// This starts at the final weight, and walks \"backward\" by finding\n// the minimum previous weight recursively until the origin of the weight\n// matrix.\nfunction spliceOperationsFromEditDistances(distances) {\n  let i = distances.length - 1;\n  let j = distances[0].length - 1;\n  let current = distances[i][j];\n  let edits = [];\n  while (i > 0 || j > 0) {\n    if (i == 0) {\n      edits.push(EDIT_ADD);\n      j--;\n      continue;\n    }\n    if (j == 0) {\n      edits.push(EDIT_DELETE);\n      i--;\n      continue;\n    }\n    let northWest = distances[i - 1][j - 1];\n    let west = distances[i - 1][j];\n    let north = distances[i][j - 1];\n\n    let min;\n    if (west < north)\n      min = west < northWest ? west : northWest;\n    else\n      min = north < northWest ? north : northWest;\n\n    if (min == northWest) {\n      if (northWest == current) {\n        edits.push(EDIT_LEAVE);\n      } else {\n        edits.push(EDIT_UPDATE);\n        current = northWest;\n      }\n      i--;\n      j--;\n    } else if (min == west) {\n      edits.push(EDIT_DELETE);\n      i--;\n      current = west;\n    } else {\n      edits.push(EDIT_ADD);\n      j--;\n      current = north;\n    }\n  }\n\n  edits.reverse();\n  return edits;\n}\n\n/**\n * Splice Projection functions:\n *\n * A splice map is a representation of how a previous array of items\n * was transformed into a new array of items. Conceptually it is a list of\n * tuples of\n *\n *   <index, removed, addedCount>\n *\n * which are kept in ascending index order of. The tuple represents that at\n * the |index|, |removed| sequence of items were removed, and counting forward\n * from |index|, |addedCount| items were added.\n */\n\n/**\n * Lacking individual splice mutation information, the minimal set of\n * splices can be synthesized given the previous state and final state of an\n * array. The basic approach is to calculate the edit distance matrix and\n * choose the shortest path through it.\n *\n * Complexity: O(l * p)\n *   l: The length of the current array\n *   p: The length of the old array\n */\nfunction calcSplices(current, currentStart, currentEnd,\n                      old, oldStart, oldEnd) {\n  let prefixCount = 0;\n  let suffixCount = 0;\n  let splice;\n\n  let minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);\n  if (currentStart == 0 && oldStart == 0)\n    prefixCount = sharedPrefix(current, old, minLength);\n\n  if (currentEnd == current.length && oldEnd == old.length)\n    suffixCount = sharedSuffix(current, old, minLength - prefixCount);\n\n  currentStart += prefixCount;\n  oldStart += prefixCount;\n  currentEnd -= suffixCount;\n  oldEnd -= suffixCount;\n\n  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)\n    return [];\n\n  if (currentStart == currentEnd) {\n    splice = newSplice(currentStart, [], 0);\n    while (oldStart < oldEnd)\n      splice.removed.push(old[oldStart++]);\n\n    return [ splice ];\n  } else if (oldStart == oldEnd)\n    return [ newSplice(currentStart, [], currentEnd - currentStart) ];\n\n  let ops = spliceOperationsFromEditDistances(\n      calcEditDistances(current, currentStart, currentEnd,\n                             old, oldStart, oldEnd));\n\n  splice = undefined;\n  let splices = [];\n  let index = currentStart;\n  let oldIndex = oldStart;\n  for (let i = 0; i < ops.length; i++) {\n    switch(ops[i]) {\n      case EDIT_LEAVE:\n        if (splice) {\n          splices.push(splice);\n          splice = undefined;\n        }\n\n        index++;\n        oldIndex++;\n        break;\n      case EDIT_UPDATE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n      case EDIT_ADD:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.addedCount++;\n        index++;\n        break;\n      case EDIT_DELETE:\n        if (!splice)\n          splice = newSplice(index, [], 0);\n\n        splice.removed.push(old[oldIndex]);\n        oldIndex++;\n        break;\n    }\n  }\n\n  if (splice) {\n    splices.push(splice);\n  }\n  return splices;\n}\n\nfunction sharedPrefix(current, old, searchLength) {\n  for (let i = 0; i < searchLength; i++)\n    if (!equals(current[i], old[i]))\n      return i;\n  return searchLength;\n}\n\nfunction sharedSuffix(current, old, searchLength) {\n  let index1 = current.length;\n  let index2 = old.length;\n  let count = 0;\n  while (count < searchLength && equals(current[--index1], old[--index2]))\n    count++;\n\n  return count;\n}\n\nfunction equals(currentValue, previousValue) {\n  return currentValue === previousValue;\n}\n\nexport function calculateSplices(current, previous) {\n  return calcSplices(current, 0, current.length, previous, 0,\n                          previous.length);\n}\n\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as mutation from './logical-mutation.js';\nimport {calculateSplices} from './array-splice.js';\nimport * as utils from './utils.js';\nimport {enqueue} from './flush.js';\nimport {recordChildNodes} from './logical-tree.js';\nimport {removeChild, insertBefore, dispatchEvent} from './native-methods.js';\nimport {parentNode, childNodes} from './native-tree.js';\nimport {patchShadowRootAccessors} from './patch-accessors.js';\n\n// Do not export this object. It must be passed as the first argument to the\n// ShadyRoot constructor in `attachShadow` to prevent the constructor from\n// throwing. This prevents the user from being able to manually construct a\n// ShadyRoot (i.e. `new ShadowRoot()`).\nconst ShadyRootConstructionToken = {};\n\nconst CATCHALL_NAME = '__catchall';\n\n/**\n * @constructor\n * @extends {ShadowRoot}\n */\nexport let ShadyRoot = function(token, host, options) {\n  if (token !== ShadyRootConstructionToken) {\n    throw new TypeError('Illegal constructor');\n  }\n  // NOTE: this strange construction is necessary because\n  // DocumentFragment cannot be subclassed on older browsers.\n  let shadowRoot = document.createDocumentFragment();\n  shadowRoot.__proto__ = ShadyRoot.prototype;\n  /** @type {ShadyRoot} */ (shadowRoot)._init(host, options);\n  return shadowRoot;\n};\n\nShadyRoot.prototype = Object.create(DocumentFragment.prototype);\n\nShadyRoot.prototype._init = function(host, options) {\n  // NOTE: set a fake local name so this element can be\n  // distinguished from a DocumentFragment when patching.\n  // FF doesn't allow this to be `localName`\n  this.__localName = 'ShadyRoot';\n  // logical dom setup\n  recordChildNodes(host);\n  recordChildNodes(this);\n  // root <=> host\n  this.host = host;\n  this._mode = options && options.mode;\n  host.__shady = host.__shady || {};\n  host.__shady.root = this;\n  host.__shady.publicRoot = this._mode !== 'closed' ? this : null;\n  // state flags\n  this._renderPending = false;\n  this._hasRendered = false;\n  this._slotList = [];\n  this._slotMap = {};\n  this.__pendingSlots = [];\n  // fast path initial render: remove existing physical dom.\n  let c$ = childNodes(host);\n  for (let i=0, l=c$.length; i < l; i++) {\n    removeChild.call(host, c$[i])\n  }\n}\n\n// async render\nShadyRoot.prototype._asyncRender = function() {\n  if (!this._renderPending) {\n    this._renderPending = true;\n    enqueue(() => this._render());\n  }\n}\n\n// returns the oldest renderPending ancestor root.\nShadyRoot.prototype._getRenderRoot = function() {\n  let renderRoot;\n  let root = this;\n  while (root) {\n    if (root._renderPending) {\n      renderRoot = root;\n    }\n    root = root._rendererForHost();\n  }\n  return renderRoot;\n}\n\n// Returns the shadyRoot `this.host` if `this.host`\n// has children that require distribution.\nShadyRoot.prototype._rendererForHost = function() {\n  let root = this.host.getRootNode();\n  if (utils.isShadyRoot(root)) {\n    let c$ = this.host.childNodes;\n    for (let i=0, c; i < c$.length; i++) {\n      c = c$[i];\n      if (this._isInsertionPoint(c)) {\n        return root;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._render = function() {\n  const root = this._getRenderRoot();\n  if (root) {\n    root['_renderRoot']();\n  }\n}\n\n// NOTE: avoid renaming to ease testability.\nShadyRoot.prototype['_renderRoot'] = function() {\n  this._renderPending = false;\n  this._distribute();\n  this._compose();\n  this._hasRendered = true;\n}\n\nShadyRoot.prototype._distribute = function() {\n  this._validateSlots();\n  // capture # of previously assigned nodes to help determine if dirty.\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    this._clearSlotAssignedNodes(slot);\n  }\n  // distribute host children.\n  for (let n=this.host.firstChild; n; n=n.nextSibling) {\n    this._distributeNodeToSlot(n);\n  }\n  // fallback content, slotchange, and dirty roots\n  for (let i=0, slot; i < this._slotList.length; i++) {\n    slot = this._slotList[i];\n    // distribute fallback content\n    if (!slot.__shady.assignedNodes.length) {\n      for (let n=slot.firstChild; n; n=n.nextSibling) {\n        this._distributeNodeToSlot(n, slot);\n      }\n    }\n    const slotParent = slot.parentNode;\n    const slotParentRoot = slotParent.__shady && slotParent.__shady.root;\n    if (slotParentRoot && slotParentRoot._hasInsertionPoint()) {\n      slotParentRoot['_renderRoot']();\n    }\n    this._addAssignedToFlattenedNodes(slot.__shady.flattenedNodes,\n      slot.__shady.assignedNodes);\n    let prevAssignedNodes = slot.__shady._previouslyAssignedNodes;\n    if (prevAssignedNodes) {\n      for (let i=0; i < prevAssignedNodes.length; i++) {\n        prevAssignedNodes[i].__shady._prevAssignedSlot = null;\n      }\n      slot.__shady._previouslyAssignedNodes = null;\n      // dirty if previously less assigned nodes than previously assigned.\n      if (prevAssignedNodes.length > slot.__shady.assignedNodes.length) {\n        slot.__shady.dirty = true;\n      }\n    }\n    /* Note: A slot is marked dirty whenever a node is newly assigned to it\n    or a node is assigned to a different slot (done in `_distributeNodeToSlot`)\n    or if the number of nodes assigned to the slot has decreased (done above);\n     */\n    if (slot.__shady.dirty) {\n      slot.__shady.dirty = false;\n      this._fireSlotChange(slot);\n    }\n  }\n}\n\n/**\n * Distributes given `node` to the appropriate slot based on its `slot`\n * attribute. If `forcedSlot` is given, then the node is distributed to the\n * `forcedSlot`.\n * Note: slot to which the node is assigned will be marked dirty for firing\n * `slotchange`.\n * @param {Node} node\n * @param {Node=} forcedSlot\n *\n */\nShadyRoot.prototype._distributeNodeToSlot = function(node, forcedSlot) {\n  node.__shady = node.__shady || {};\n  let oldSlot = node.__shady._prevAssignedSlot;\n  node.__shady._prevAssignedSlot = null;\n  let slot = forcedSlot;\n  if (!slot) {\n    let name = node.slot || CATCHALL_NAME;\n    const list = this._slotMap[name];\n    slot = list && list[0];\n  }\n  if (slot) {\n    slot.__shady.assignedNodes.push(node);\n    node.__shady.assignedSlot = slot;\n  } else {\n    node.__shady.assignedSlot = undefined;\n  }\n  if (oldSlot !== node.__shady.assignedSlot) {\n    if (node.__shady.assignedSlot) {\n      node.__shady.assignedSlot.__shady.dirty = true;\n    }\n  }\n}\n\n/**\n * Clears the assignedNodes tracking data for a given `slot`. Note, the current\n * assigned node data is tracked (via _previouslyAssignedNodes and\n * _prevAssignedSlot) to see if `slotchange` should fire. This data may be out\n *  of date at this time because the assigned nodes may have already been\n * distributed to another root. This is ok since this data is only used to\n * track changes.\n * @param {HTMLSlotElement} slot\n */\nShadyRoot.prototype._clearSlotAssignedNodes = function(slot) {\n  let n$ = slot.__shady.assignedNodes;\n  slot.__shady.assignedNodes = [];\n  slot.__shady.flattenedNodes = [];\n  slot.__shady._previouslyAssignedNodes = n$;\n  if (n$) {\n    for (let i=0; i < n$.length; i++) {\n      let n = n$[i];\n      n.__shady._prevAssignedSlot = n.__shady.assignedSlot;\n      // only clear if it was previously set to this slot;\n      // this helps ensure that if the node has otherwise been distributed\n      // ignore it.\n      if (n.__shady.assignedSlot === slot) {\n        n.__shady.assignedSlot = null;\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._addAssignedToFlattenedNodes = function(flattened, assigned) {\n  for (let i=0, n; (i<assigned.length) && (n=assigned[i]); i++) {\n    if (n.localName == 'slot') {\n      const nestedAssigned = n.__shady.assignedNodes;\n      if (nestedAssigned && nestedAssigned.length) {\n        this._addAssignedToFlattenedNodes(flattened, nestedAssigned);\n      }\n    } else {\n      flattened.push(assigned[i]);\n    }\n  }\n}\n\nShadyRoot.prototype._fireSlotChange = function(slot) {\n  // NOTE: cannot bubble correctly here so not setting bubbles: true\n  // Safari tech preview does not bubble but chrome does\n  // Spec says it bubbles (https://dom.spec.whatwg.org/#mutation-observers)\n  dispatchEvent.call(slot, new Event('slotchange'));\n  if (slot.__shady.assignedSlot) {\n    this._fireSlotChange(slot.__shady.assignedSlot);\n  }\n}\n\n// Reify dom such that it is at its correct rendering position\n// based on logical distribution.\n// NOTE: here we only compose parents of <slot> elements and not the\n// shadowRoot into the host. The latter is performend via a fast path\n// in the `logical-mutation`.insertBefore.\nShadyRoot.prototype._compose = function() {\n  const slots = this._slotList;\n  let composeList = [];\n  for (let i=0; i < slots.length; i++) {\n    const parent = slots[i].parentNode;\n    /* compose node only if:\n      (1) parent does not have a shadowRoot since shadowRoot has already\n      composed into the host\n      (2) we're not already composing it\n      [consider (n^2) but rare better than Set]\n    */\n    if (!(parent.__shady && parent.__shady.root) &&\n      composeList.indexOf(parent) < 0) {\n      composeList.push(parent);\n    }\n  }\n  for (let i=0; i < composeList.length; i++) {\n    const node = composeList[i];\n    const targetNode = node === this ? this.host : node;\n    this._updateChildNodes(targetNode, this._composeNode(node));\n  }\n}\n\n// Returns the list of nodes which should be rendered inside `node`.\nShadyRoot.prototype._composeNode = function(node) {\n  let children = [];\n  let c$ = node.childNodes;\n  for (let i = 0; i < c$.length; i++) {\n    let child = c$[i];\n    // Note: if we see a slot here, the nodes are guaranteed to need to be\n    // composed here. This is because if there is redistribution, it has\n    // already been handled by this point.\n    if (this._isInsertionPoint(child)) {\n      let flattenedNodes = child.__shady.flattenedNodes;\n      for (let j = 0; j < flattenedNodes.length; j++) {\n        let distributedNode = flattenedNodes[j];\n          children.push(distributedNode);\n      }\n    } else {\n      children.push(child);\n    }\n  }\n  return children;\n}\n\nShadyRoot.prototype._isInsertionPoint = function(node) {\n    return node.localName == 'slot';\n  }\n\n// Ensures that the rendered node list inside `container` is `children`.\nShadyRoot.prototype._updateChildNodes = function(container, children) {\n  let composed = childNodes(container);\n  let splices = calculateSplices(children, composed);\n  // process removals\n  for (let i=0, d=0, s; (i<splices.length) && (s=splices[i]); i++) {\n    for (let j=0, n; (j < s.removed.length) && (n=s.removed[j]); j++) {\n      // check if the node is still where we expect it is before trying\n      // to remove it; this can happen if we move a node and\n      // then schedule its previous host for distribution resulting in\n      // the node being removed here.\n      if (parentNode(n) === container) {\n        removeChild.call(container, n);\n      }\n      composed.splice(s.index + d, 1);\n    }\n    d -= s.addedCount;\n  }\n  // process adds\n  for (let i=0, s, next; (i<splices.length) && (s=splices[i]); i++) { //eslint-disable-line no-redeclare\n    next = composed[s.index];\n    for (let j=s.index, n; j < s.index + s.addedCount; j++) {\n      n = children[j];\n      insertBefore.call(container, n, next);\n      composed.splice(j, 0, n);\n    }\n  }\n}\n\nShadyRoot.prototype._addSlots = function(slots) {\n  this.__pendingSlots.push(...slots);\n}\n\nShadyRoot.prototype._validateSlots = function() {\n  if (this.__pendingSlots.length) {\n    this._mapSlots(this.__pendingSlots);\n    this.__pendingSlots = [];\n  }\n}\n\n/**\n * Adds the given slots. Slots are maintained in an dom-ordered list.\n * In addition a map of name to slot is updated.\n */\nShadyRoot.prototype._mapSlots = function(slots) {\n  let slotNamesToSort;\n  for (let i=0; i < slots.length; i++) {\n    let slot = slots[i];\n    // ensure insertionPoints's and their parents have logical dom info.\n    // save logical tree info\n    // a. for shadyRoot\n    // b. for insertion points (fallback)\n    // c. for parents of insertion points\n    slot.__shady = slot.__shady || {};\n    recordChildNodes(slot);\n    recordChildNodes(slot.parentNode);\n    let name = this._nameForSlot(slot);\n    if (this._slotMap[name]) {\n      slotNamesToSort = slotNamesToSort || {};\n      slotNamesToSort[name] = true;\n      this._slotMap[name].push(slot);\n    } else {\n      this._slotMap[name] = [slot];\n    }\n    this._slotList.push(slot);\n  }\n  if (slotNamesToSort) {\n    for (let n in slotNamesToSort) {\n      this._slotMap[n] = this._sortSlots(this._slotMap[n]);\n    }\n  }\n}\n\nShadyRoot.prototype._nameForSlot = function(slot) {\n  const name = slot['name'] || slot.getAttribute('name') || CATCHALL_NAME;\n  slot.__slotName = name;\n  return name;\n}\n\n/**\n * Slots are kept in an ordered list. Slots with the same name\n * are sorted here by tree order.\n */\nShadyRoot.prototype._sortSlots = function(slots) {\n  // NOTE: Cannot use `compareDocumentPosition` because it's not polyfilled,\n  // but the code here could be used to polyfill the preceeding/following info\n  // in `compareDocumentPosition`.\n  return slots.sort((a, b) => {\n    let listA = ancestorList(a);\n    let listB = ancestorList(b);\n    for (var i=0; i < listA.length; i++) {\n      let nA = listA[i];\n      let nB = listB[i];\n      if (nA !== nB) {\n        let c$ = Array.from(nA.parentNode.childNodes);\n        return c$.indexOf(nA) - c$.indexOf(nB);\n      }\n    }\n  });\n}\n\nfunction ancestorList(node) {\n  let ancestors = [];\n  do {\n    ancestors.unshift(node);\n  } while ((node = node.parentNode));\n  return ancestors;\n}\n\n/**\n * Removes from tracked slot data any slots contained within `container` and\n * then updates the tracked data (_slotList and _slotMap).\n * Any removed slots also have their `assignedNodes` removed from comopsed dom.\n */\nShadyRoot.prototype._removeContainedSlots = function(container) {\n  this._validateSlots();\n  let didRemove;\n  const map = this._slotMap;\n  for (let n in map) {\n    let slots = map[n];\n    for (let i=0; i < slots.length; i++) {\n      let slot = slots[i];\n      if (utils.contains(container, slot)) {\n        slots.splice(i, 1);\n        const x = this._slotList.indexOf(slot);\n        if (x >= 0) {\n          this._slotList.splice(x, 1);\n        }\n        i--;\n        this._removeFlattenedNodes(slot);\n        didRemove = true;\n      }\n    }\n  }\n  return didRemove;\n}\n\nShadyRoot.prototype._updateSlotName = function(slot) {\n  const oldName = slot.__slotName;\n  const name = this._nameForSlot(slot);\n  if (name === oldName) {\n    return;\n  }\n  // remove from existing tracking\n  let slots = this._slotMap[oldName];\n  const i = slots.indexOf(slot);\n  if (i >= 0) {\n    slots.splice(i, 1);\n  }\n  // add to new location and sort if nedessary\n  let list = this._slotMap[name] || (this._slotMap[name] = []);\n  list.push(slot);\n  if (list.length > 1) {\n    this._slotMap[name] = this._sortSlots(list);\n  }\n}\n\nShadyRoot.prototype._removeFlattenedNodes = function(slot) {\n  let n$ = slot.__shady.flattenedNodes;\n  if (n$) {\n    for (let i=0; i<n$.length; i++) {\n      let node = n$[i];\n      let parent = parentNode(node);\n      if (parent) {\n        removeChild.call(parent, node);\n      }\n    }\n  }\n}\n\nShadyRoot.prototype._hasInsertionPoint = function() {\n  this._validateSlots();\n  return Boolean(this._slotList.length);\n}\n\nShadyRoot.prototype.addEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.addEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.removeEventListener = function(type, fn, optionsOrCapture) {\n  if (typeof optionsOrCapture !== 'object') {\n    optionsOrCapture = {\n      capture: Boolean(optionsOrCapture)\n    }\n  }\n  optionsOrCapture.__shadyTarget = this;\n  this.host.removeEventListener(type, fn, optionsOrCapture);\n}\n\nShadyRoot.prototype.getElementById = function(id) {\n  let result = mutation.query(this, function(n) {\n    return n.id == id;\n  }, function(n) {\n    return Boolean(n);\n  })[0];\n  return result || null;\n}\n\n/**\n  Implements a pared down version of ShadowDOM's scoping, which is easy to\n  polyfill across browsers.\n*/\nexport function attachShadow(host, options) {\n  if (!host) {\n    throw 'Must provide a host.';\n  }\n  if (!options) {\n    throw 'Not enough arguments.'\n  }\n  return new ShadyRoot(ShadyRootConstructionToken, host, options);\n}\n\npatchShadowRootAccessors(ShadyRoot.prototype);","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nimport * as utils from './utils.js';\nimport {flush} from './flush.js';\nimport {dispatchEvent, contains as nativeContains} from './native-methods.js';\nimport * as mutation from './logical-mutation.js';\nimport {ActiveElementAccessor, ShadowRootAccessor, patchAccessors} from './patch-accessors.js';\nimport {addEventListener, removeEventListener} from './patch-events.js';\nimport {attachShadow, ShadyRoot} from './attach-shadow.js';\n\nfunction getAssignedSlot(node) {\n  mutation.renderRootNode(node);\n  return node.__shady && node.__shady.assignedSlot || null;\n}\n\nlet windowMixin = {\n\n  // NOTE: ensure these methods are bound to `window` so that `this` is correct\n  // when called directly from global context without a receiver; e.g.\n  // `addEventListener(...)`.\n  addEventListener: addEventListener.bind(window),\n\n  removeEventListener: removeEventListener.bind(window)\n\n};\n\nlet nodeMixin = {\n\n  addEventListener: addEventListener,\n\n  removeEventListener: removeEventListener,\n\n  appendChild(node) {\n    return mutation.insertBefore(this, node);\n  },\n\n  insertBefore(node, ref_node) {\n    return mutation.insertBefore(this, node, ref_node);\n  },\n\n  removeChild(node) {\n    return mutation.removeChild(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  replaceChild(node, ref_node) {\n    mutation.insertBefore(this, node, ref_node);\n    mutation.removeChild(this, ref_node);\n    return node;\n  },\n\n  /**\n   * @this {Node}\n   */\n  cloneNode(deep) {\n    return mutation.cloneNode(this, deep);\n  },\n\n  /**\n   * @this {Node}\n   */\n  getRootNode(options) {\n    return mutation.getRootNode(this, options);\n  },\n\n  contains(node) {\n    return utils.contains(this, node);\n  },\n\n  /**\n   * @this {Node}\n   */\n  get isConnected() {\n    // Fast path for distributed nodes.\n    const ownerDocument = this.ownerDocument;\n    if (utils.hasDocumentContains && nativeContains.call(ownerDocument, this)) {\n      return true;\n    }\n    if (ownerDocument.documentElement &&\n      nativeContains.call(ownerDocument.documentElement, this)) {\n      return true;\n    }\n    let node = this;\n    while (node && !(node instanceof Document)) {\n      node = node.parentNode || (node instanceof ShadyRoot ? /** @type {ShadowRoot} */(node).host : undefined);\n    }\n    return !!(node && node instanceof Document);\n  },\n\n  /**\n   * @this {Node}\n   */\n  dispatchEvent(event) {\n    flush();\n    return dispatchEvent.call(this, event);\n  }\n\n};\n\n// NOTE: For some reason 'Text' redefines 'assignedSlot'\nlet textMixin = {\n  /**\n   * @this {Text}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n};\n\nlet fragmentMixin = {\n\n  // TODO(sorvell): consider doing native QSA and filtering results.\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelector(selector) {\n    // match selector and halt on first result.\n    let result = mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  },\n\n  /**\n   * @this {DocumentFragment}\n   */\n  querySelectorAll(selector) {\n    return mutation.query(this, function(n) {\n      return utils.matchesSelector(n, selector);\n    });\n  }\n\n};\n\nlet slotMixin = {\n\n  /**\n   * @this {HTMLSlotElement}\n   */\n  assignedNodes(options) {\n    if (this.localName === 'slot') {\n      mutation.renderRootNode(this);\n      return this.__shady ?\n        ((options && options.flatten ? this.__shady.flattenedNodes :\n        this.__shady.assignedNodes) || []) :\n        [];\n    }\n  }\n\n};\n\nlet elementMixin = utils.extendAll({\n\n  /**\n   * @this {HTMLElement}\n   */\n  setAttribute(name, value) {\n    mutation.setAttribute(this, name, value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  removeAttribute(name) {\n    mutation.removeAttribute(this, name);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  attachShadow(options) {\n    return attachShadow(this, options);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get slot() {\n    return this.getAttribute('slot');\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  set slot(value) {\n    mutation.setAttribute(this, 'slot', value);\n  },\n\n  /**\n   * @this {HTMLElement}\n   */\n  get assignedSlot() {\n    return getAssignedSlot(this);\n  }\n\n}, fragmentMixin, slotMixin);\n\nObject.defineProperties(elementMixin, ShadowRootAccessor);\n\nlet documentMixin = utils.extendAll({\n  /**\n   * @this {Document}\n   */\n  importNode(node, deep) {\n    return mutation.importNode(node, deep);\n  },\n\n  /**\n   * @this {Document}\n   */\n  getElementById(id) {\n    let result = mutation.query(this, function(n) {\n      return n.id == id;\n    }, function(n) {\n      return Boolean(n);\n    })[0];\n    return result || null;\n  }\n\n}, fragmentMixin);\n\nObject.defineProperties(documentMixin, {\n  '_activeElement': ActiveElementAccessor.activeElement\n});\n\nlet nativeBlur = HTMLElement.prototype.blur;\n\nlet htmlElementMixin = utils.extendAll({\n  /**\n   * @this {HTMLElement}\n   */\n  blur() {\n    let root = this.__shady && this.__shady.root;\n    let shadowActive = root && root.activeElement;\n    if (shadowActive) {\n      shadowActive.blur();\n    } else {\n      nativeBlur.call(this);\n    }\n  }\n})\n\nfunction patchBuiltin(proto, obj) {\n  let n$ = Object.getOwnPropertyNames(obj);\n  for (let i=0; i < n$.length; i++) {\n    let n = n$[i];\n    let d = Object.getOwnPropertyDescriptor(obj, n);\n    // NOTE: we prefer writing directly here because some browsers\n    // have descriptors that are writable but not configurable (e.g.\n    // `appendChild` on older browsers)\n    if (d.value) {\n      proto[n] = d.value;\n    } else {\n      Object.defineProperty(proto, n, d);\n    }\n  }\n}\n\n\n// Apply patches to builtins (e.g. Element.prototype). Some of these patches\n// can be done unconditionally (mostly methods like\n// `Element.prototype.appendChild`) and some can only be done when the browser\n// has proper descriptors on the builtin prototype\n// (e.g. `Element.prototype.firstChild`)`. When descriptors are not available,\n// elements are individually patched when needed (see e.g.\n// `patchInside/OutsideElementAccessors` in `patch-accessors.js`).\nexport function patchBuiltins() {\n  let nativeHTMLElement =\n    (window['customElements'] && window['customElements']['nativeHTMLElement']) ||\n    HTMLElement;\n  // These patches can always be done, for all supported browsers.\n  patchBuiltin(window.Node.prototype, nodeMixin);\n  patchBuiltin(window.Window.prototype, windowMixin);\n  patchBuiltin(window.Text.prototype, textMixin);\n  patchBuiltin(window.DocumentFragment.prototype, fragmentMixin);\n  patchBuiltin(window.Element.prototype, elementMixin);\n  patchBuiltin(window.Document.prototype, documentMixin);\n  if (window.HTMLSlotElement) {\n    patchBuiltin(window.HTMLSlotElement.prototype, slotMixin);\n  }\n  patchBuiltin(nativeHTMLElement.prototype, htmlElementMixin);\n  // These patches can *only* be done\n  // on browsers that have proper property descriptors on builtin prototypes.\n  // This includes: IE11, Edge, Chrome >= 4?; Safari >= 10, Firefox\n  // On older browsers (Chrome <= 4?, Safari 9), a per element patching\n  // strategy is used for patching accessors.\n  if (utils.settings.hasDescriptors) {\n    patchAccessors(window.Node.prototype);\n    patchAccessors(window.Text.prototype);\n    patchAccessors(window.DocumentFragment.prototype);\n    patchAccessors(window.Element.prototype);\n    patchAccessors(nativeHTMLElement.prototype);\n    patchAccessors(window.Document.prototype);\n    if (window.HTMLSlotElement) {\n      patchAccessors(window.HTMLSlotElement.prototype);\n    }\n  }\n}\n","const reservedTagList = new Set([\n  'annotation-xml',\n  'color-profile',\n  'font-face',\n  'font-face-src',\n  'font-face-uri',\n  'font-face-format',\n  'font-face-name',\n  'missing-glyph',\n]);\n\n/**\n * @param {string} localName\n * @returns {boolean}\n */\nexport function isValidCustomElementName(localName) {\n  const reserved = reservedTagList.has(localName);\n  const validForm = /^[a-z][.0-9_a-z]*-[\\-.0-9_a-z]*$/.test(localName);\n  return !reserved && validForm;\n}\n\n/**\n * @private\n * @param {!Node} node\n * @return {boolean}\n */\nexport function isConnected(node) {\n  // Use `Node#isConnected`, if defined.\n  const nativeValue = node.isConnected;\n  if (nativeValue !== undefined) {\n    return nativeValue;\n  }\n\n  /** @type {?Node|undefined} */\n  let current = node;\n  while (current && !(current.__CE_isImportDocument || current instanceof Document)) {\n    current = current.parentNode || (window.ShadowRoot && current instanceof ShadowRoot ? current.host : undefined);\n  }\n  return !!(current && (current.__CE_isImportDocument || current instanceof Document));\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextSiblingOrAncestorSibling(root, start) {\n  let node = start;\n  while (node && node !== root && !node.nextSibling) {\n    node = node.parentNode;\n  }\n  return (!node || node === root) ? null : node.nextSibling;\n}\n\n/**\n * @param {!Node} root\n * @param {!Node} start\n * @return {?Node}\n */\nfunction nextNode(root, start) {\n  return start.firstChild ? start.firstChild : nextSiblingOrAncestorSibling(root, start);\n}\n\n/**\n * @param {!Node} root\n * @param {!function(!Element)} callback\n * @param {!Set<Node>=} visitedImports\n */\nexport function walkDeepDescendantElements(root, callback, visitedImports = new Set()) {\n  let node = root;\n  while (node) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      const element = /** @type {!Element} */(node);\n\n      callback(element);\n\n      const localName = element.localName;\n      if (localName === 'link' && element.getAttribute('rel') === 'import') {\n        // If this import (polyfilled or not) has it's root node available,\n        // walk it.\n        const importNode = /** @type {!Node} */ (element.import);\n        if (importNode instanceof Node && !visitedImports.has(importNode)) {\n          // Prevent multiple walks of the same import root.\n          visitedImports.add(importNode);\n\n          for (let child = importNode.firstChild; child; child = child.nextSibling) {\n            walkDeepDescendantElements(child, callback, visitedImports);\n          }\n        }\n\n        // Ignore descendants of import links to prevent attempting to walk the\n        // elements created by the HTML Imports polyfill that we just walked\n        // above.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      } else if (localName === 'template') {\n        // Ignore descendants of templates. There shouldn't be any descendants\n        // because they will be moved into `.content` during construction in\n        // browsers that support template but, in case they exist and are still\n        // waiting to be moved by a polyfill, they will be ignored.\n        node = nextSiblingOrAncestorSibling(root, element);\n        continue;\n      }\n\n      // Walk shadow roots.\n      const shadowRoot = element.__CE_shadowRoot;\n      if (shadowRoot) {\n        for (let child = shadowRoot.firstChild; child; child = child.nextSibling) {\n          walkDeepDescendantElements(child, callback, visitedImports);\n        }\n      }\n    }\n\n    node = nextNode(root, node);\n  }\n}\n\n/**\n * Used to suppress Closure's \"Modifying the prototype is only allowed if the\n * constructor is in the same scope\" warning without using\n * `@suppress {newCheckTypes, duplicate}` because `newCheckTypes` is too broad.\n *\n * @param {!Object} destination\n * @param {string} name\n * @param {*} value\n */\nexport function setPropertyUnchecked(destination, name, value) {\n  destination[name] = value;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/*\nExtremely simple css parser. Intended to be not more than what we need\nand definitely not necessarily correct =).\n*/\n\n'use strict';\n\n/** @unrestricted */\nclass StyleNode {\n  constructor() {\n    /** @type {number} */\n    this['start'] = 0;\n    /** @type {number} */\n    this['end'] = 0;\n    /** @type {StyleNode} */\n    this['previous'] = null;\n    /** @type {StyleNode} */\n    this['parent'] = null;\n    /** @type {Array<StyleNode>} */\n    this['rules'] = null;\n    /** @type {string} */\n    this['parsedCssText'] = '';\n    /** @type {string} */\n    this['cssText'] = '';\n    /** @type {boolean} */\n    this['atRule'] = false;\n    /** @type {number} */\n    this['type'] = 0;\n    /** @type {string} */\n    this['keyframesName'] = '';\n    /** @type {string} */\n    this['selector'] = '';\n    /** @type {string} */\n    this['parsedSelector'] = '';\n  }\n}\n\nexport {StyleNode}\n\n// given a string of css, return a simple rule tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nexport function parse(text) {\n  text = clean(text);\n  return parseCss(lex(text), text);\n}\n\n// remove stuff we don't care about that may hinder parsing\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction clean(cssText) {\n  return cssText.replace(RX.comments, '').replace(RX.port, '');\n}\n\n// super simple {...} lexer that returns a node tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nfunction lex(text) {\n  let root = new StyleNode();\n  root['start'] = 0;\n  root['end'] = text.length\n  let n = root;\n  for (let i = 0, l = text.length; i < l; i++) {\n    if (text[i] === OPEN_BRACE) {\n      if (!n['rules']) {\n        n['rules'] = [];\n      }\n      let p = n;\n      let previous = p['rules'][p['rules'].length - 1] || null;\n      n = new StyleNode();\n      n['start'] = i + 1;\n      n['parent'] = p;\n      n['previous'] = previous;\n      p['rules'].push(n);\n    } else if (text[i] === CLOSE_BRACE) {\n      n['end'] = i + 1;\n      n = n['parent'] || root;\n    }\n  }\n  return root;\n}\n\n// add selectors/cssText to node tree\n/**\n * @param {StyleNode} node\n * @param {string} text\n * @return {StyleNode}\n */\nfunction parseCss(node, text) {\n  let t = text.substring(node['start'], node['end'] - 1);\n  node['parsedCssText'] = node['cssText'] = t.trim();\n  if (node['parent']) {\n    let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];\n    t = text.substring(ss, node['start'] - 1);\n    t = _expandUnicodeEscapes(t);\n    t = t.replace(RX.multipleSpaces, ' ');\n    // TODO(sorvell): ad hoc; make selector include only after last ;\n    // helps with mixin syntax\n    t = t.substring(t.lastIndexOf(';') + 1);\n    let s = node['parsedSelector'] = node['selector'] = t.trim();\n    node['atRule'] = (s.indexOf(AT_START) === 0);\n    // note, support a subset of rule types...\n    if (node['atRule']) {\n      if (s.indexOf(MEDIA_START) === 0) {\n        node['type'] = types.MEDIA_RULE;\n      } else if (s.match(RX.keyframesRule)) {\n        node['type'] = types.KEYFRAMES_RULE;\n        node['keyframesName'] =\n          node['selector'].split(RX.multipleSpaces).pop();\n      }\n    } else {\n      if (s.indexOf(VAR_START) === 0) {\n        node['type'] = types.MIXIN_RULE;\n      } else {\n        node['type'] = types.STYLE_RULE;\n      }\n    }\n  }\n  let r$ = node['rules'];\n  if (r$) {\n    for (let i = 0, l = r$.length, r;\n      (i < l) && (r = r$[i]); i++) {\n      parseCss(r, text);\n    }\n  }\n  return node;\n}\n\n/**\n * conversion of sort unicode escapes with spaces like `\\33 ` (and longer) into\n * expanded form that doesn't require trailing space `\\000033`\n * @param {string} s\n * @return {string}\n */\nfunction _expandUnicodeEscapes(s) {\n  return s.replace(/\\\\([0-9a-f]{1,6})\\s/gi, function() {\n    let code = arguments[1],\n      repeat = 6 - code.length;\n    while (repeat--) {\n      code = '0' + code;\n    }\n    return '\\\\' + code;\n  });\n}\n\n/**\n * stringify parsed css.\n * @param {StyleNode} node\n * @param {boolean=} preserveProperties\n * @param {string=} text\n * @return {string}\n */\nexport function stringify(node, preserveProperties, text = '') {\n  // calc rule cssText\n  let cssText = '';\n  if (node['cssText'] || node['rules']) {\n    let r$ = node['rules'];\n    if (r$ && !_hasMixinRules(r$)) {\n      for (let i = 0, l = r$.length, r;\n        (i < l) && (r = r$[i]); i++) {\n        cssText = stringify(r, preserveProperties, cssText);\n      }\n    } else {\n      cssText = preserveProperties ? node['cssText'] :\n        removeCustomProps(node['cssText']);\n      cssText = cssText.trim();\n      if (cssText) {\n        cssText = '  ' + cssText + '\\n';\n      }\n    }\n  }\n  // emit rule if there is cssText\n  if (cssText) {\n    if (node['selector']) {\n      text += node['selector'] + ' ' + OPEN_BRACE + '\\n';\n    }\n    text += cssText;\n    if (node['selector']) {\n      text += CLOSE_BRACE + '\\n\\n';\n    }\n  }\n  return text;\n}\n\n/**\n * @param {Array<StyleNode>} rules\n * @return {boolean}\n */\nfunction _hasMixinRules(rules) {\n  let r = rules[0];\n  return Boolean(r) && Boolean(r['selector']) && r['selector'].indexOf(VAR_START) === 0;\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomProps(cssText) {\n  cssText = removeCustomPropAssignment(cssText);\n  return removeCustomPropApply(cssText);\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nexport function removeCustomPropAssignment(cssText) {\n  return cssText\n    .replace(RX.customProp, '')\n    .replace(RX.mixinProp, '');\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomPropApply(cssText) {\n  return cssText\n    .replace(RX.mixinApply, '')\n    .replace(RX.varApply, '');\n}\n\n/** @enum {number} */\nexport const types = {\n  STYLE_RULE: 1,\n  KEYFRAMES_RULE: 7,\n  MEDIA_RULE: 4,\n  MIXIN_RULE: 1000\n}\n\nconst OPEN_BRACE = '{';\nconst CLOSE_BRACE = '}';\n\n// helper regexp's\nconst RX = {\n  comments: /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//gim,\n  port: /@import[^;]*;/gim,\n  customProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?(?:[;\\n]|$)/gim,\n  mixinProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?{[^}]*?}(?:[;\\n]|$)?/gim,\n  mixinApply: /@apply\\s*\\(?[^);]*\\)?\\s*(?:[;\\n]|$)?/gim,\n  varApply: /[^;:]*?:[^;]*?var\\([^;]*\\)(?:[;\\n]|$)?/gim,\n  keyframesRule: /^@[^\\s]*keyframes/,\n  multipleSpaces: /\\s+/g\n}\n\nconst VAR_START = '--';\nconst MEDIA_START = '@media';\nconst AT_START = '@';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport let nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);\nexport let nativeCssVariables;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n  if (settings && settings['shimcssproperties']) {\n    nativeCssVariables = false;\n  } else {\n    // chrome 49 has semi-working css vars, check if box-shadow works\n    // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n    // However, shim css custom properties are only supported with ShadyDOM enabled,\n    // so fall back on native if we do not detect ShadyDOM\n    // Edge 15: custom properties used in ::before and ::after will also be used in the parent element\n    // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12414257/\n    nativeCssVariables = nativeShadow || Boolean(!navigator.userAgent.match(/AppleWebKit\\/601|Edge\\/15/) &&\n      window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));\n  }\n}\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n  nativeCssVariables = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n  calcCssVariables(window.ShadyCSS);\n  // reset window variable to let ShadyCSS API take its place\n  window.ShadyCSS = undefined;\n} else {\n  calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {!Set<string>} */\nconst styleTextSet = new Set();\n\nexport const scopingAttribute = 'shady-unscoped';\n\n/**\n * Add a specifically-marked style to the document directly, and only one copy of that style.\n *\n * @param {!HTMLStyleElement} style\n * @return {undefined}\n */\nexport function processUnscopedStyle(style) {\n  const text = style.textContent;\n  if (!styleTextSet.has(text)) {\n    styleTextSet.add(text);\n    const newStyle = style.cloneNode(true);\n    document.head.appendChild(newStyle);\n  }\n}\n\n/**\n * Check if a style is supposed to be unscoped\n * @param {!HTMLStyleElement} style\n * @return {boolean} true if the style has the unscoping attribute\n */\nexport function isUnscopedStyle(style) {\n  return style.hasAttribute(scopingAttribute);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow, nativeCssVariables} from './style-settings.js';\nimport {parse, stringify, types, StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport {MEDIA_MATCH} from './common-regex.js';\nimport {processUnscopedStyle, isUnscopedStyle} from './unscoped-style-handler.js';\n\n/**\n * @param {string|StyleNode} rules\n * @param {function(StyleNode)=} callback\n * @return {string}\n */\nexport function toCssText (rules, callback) {\n  if (!rules) {\n    return '';\n  }\n  if (typeof rules === 'string') {\n    rules = parse(rules);\n  }\n  if (callback) {\n    forEachRule(rules, callback);\n  }\n  return stringify(rules, nativeCssVariables);\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @return {StyleNode}\n */\nexport function rulesForStyle(style) {\n  if (!style['__cssRules'] && style.textContent) {\n    style['__cssRules'] = parse(style.textContent);\n  }\n  return style['__cssRules'] || null;\n}\n\n// Tests if a rule is a keyframes selector, which looks almost exactly\n// like a normal selector but is not (it has nothing to do with scoping\n// for example).\n/**\n * @param {StyleNode} rule\n * @return {boolean}\n */\nexport function isKeyframesSelector(rule) {\n  return Boolean(rule['parent']) &&\n  rule['parent']['type'] === types.KEYFRAMES_RULE;\n}\n\n/**\n * @param {StyleNode} node\n * @param {Function=} styleRuleCallback\n * @param {Function=} keyframesRuleCallback\n * @param {boolean=} onlyActiveRules\n */\nexport function forEachRule(node, styleRuleCallback, keyframesRuleCallback, onlyActiveRules) {\n  if (!node) {\n    return;\n  }\n  let skipRules = false;\n  let type = node['type'];\n  if (onlyActiveRules) {\n    if (type === types.MEDIA_RULE) {\n      let matchMedia = node['selector'].match(MEDIA_MATCH);\n      if (matchMedia) {\n        // if rule is a non matching @media rule, skip subrules\n        if (!window.matchMedia(matchMedia[1]).matches) {\n          skipRules = true;\n        }\n      }\n    }\n  }\n  if (type === types.STYLE_RULE) {\n    styleRuleCallback(node);\n  } else if (keyframesRuleCallback &&\n    type === types.KEYFRAMES_RULE) {\n    keyframesRuleCallback(node);\n  } else if (type === types.MIXIN_RULE) {\n    skipRules = true;\n  }\n  let r$ = node['rules'];\n  if (r$ && !skipRules) {\n    for (let i=0, l=r$.length, r; (i<l) && (r=r$[i]); i++) {\n      forEachRule(r, styleRuleCallback, keyframesRuleCallback, onlyActiveRules);\n    }\n  }\n}\n\n// add a string of cssText to the document.\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @param {Node} target\n * @param {Node} contextNode\n * @return {HTMLStyleElement}\n */\nexport function applyCss(cssText, moniker, target, contextNode) {\n  let style = createScopeStyle(cssText, moniker);\n  applyStyle(style, target, contextNode);\n  return style;\n}\n\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @return {HTMLStyleElement}\n */\nexport function createScopeStyle(cssText, moniker) {\n  let style = /** @type {HTMLStyleElement} */(document.createElement('style'));\n  if (moniker) {\n    style.setAttribute('scope', moniker);\n  }\n  style.textContent = cssText;\n  return style;\n}\n\n/**\n * Track the position of the last added style for placing placeholders\n * @type {Node}\n */\nlet lastHeadApplyNode = null;\n\n// insert a comment node as a styling position placeholder.\n/**\n * @param {string} moniker\n * @return {!Comment}\n */\nexport function applyStylePlaceHolder(moniker) {\n  let placeHolder = document.createComment(' Shady DOM styles for ' +\n    moniker + ' ');\n  let after = lastHeadApplyNode ?\n    lastHeadApplyNode['nextSibling'] : null;\n  let scope = document.head;\n  scope.insertBefore(placeHolder, after || scope.firstChild);\n  lastHeadApplyNode = placeHolder;\n  return placeHolder;\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @param {?Node} target\n * @param {?Node} contextNode\n */\nexport function applyStyle(style, target, contextNode) {\n  target = target || document.head;\n  let after = (contextNode && contextNode.nextSibling) ||\n    target.firstChild;\n  target.insertBefore(style, after);\n  if (!lastHeadApplyNode) {\n    lastHeadApplyNode = style;\n  } else {\n    // only update lastHeadApplyNode if the new style is inserted after the old lastHeadApplyNode\n    let position = style.compareDocumentPosition(lastHeadApplyNode);\n    if (position === Node.DOCUMENT_POSITION_PRECEDING) {\n      lastHeadApplyNode = style;\n    }\n  }\n}\n\n/**\n * @param {string} buildType\n * @return {boolean}\n */\nexport function isTargetedBuild(buildType) {\n  return nativeShadow ? buildType === 'shadow' : buildType === 'shady';\n}\n\n/**\n * @param {Element} element\n * @return {?string}\n */\nexport function getCssBuildType(element) {\n  return element.getAttribute('css-build');\n}\n\n/**\n * Walk from text[start] matching parens and\n * returns position of the outer end paren\n * @param {string} text\n * @param {number} start\n * @return {number}\n */\nfunction findMatchingParen(text, start) {\n  let level = 0;\n  for (let i=start, l=text.length; i < l; i++) {\n    if (text[i] === '(') {\n      level++;\n    } else if (text[i] === ')') {\n      if (--level === 0) {\n        return i;\n      }\n    }\n  }\n  return -1;\n}\n\n/**\n * @param {string} str\n * @param {function(string, string, string, string)} callback\n */\nexport function processVariableAndFallback(str, callback) {\n  // find 'var('\n  let start = str.indexOf('var(');\n  if (start === -1) {\n    // no var?, everything is prefix\n    return callback(str, '', '', '');\n  }\n  //${prefix}var(${inner})${suffix}\n  let end = findMatchingParen(str, start + 3);\n  let inner = str.substring(start + 4, end);\n  let prefix = str.substring(0, start);\n  // suffix may have other variables\n  let suffix = processVariableAndFallback(str.substring(end + 1), callback);\n  let comma = inner.indexOf(',');\n  // value and fallback args should be trimmed to match in property lookup\n  if (comma === -1) {\n    // variable, no fallback\n    return callback(prefix, inner.trim(), '', suffix);\n  }\n  // var(${value},${fallback})\n  let value = inner.substring(0, comma).trim();\n  let fallback = inner.substring(comma + 1).trim();\n  return callback(prefix, value, fallback, suffix);\n}\n\n/**\n * @param {Element} element\n * @param {string} value\n */\nexport function setElementClassRaw(element, value) {\n  // use native setAttribute provided by ShadyDOM when setAttribute is patched\n  if (nativeShadow) {\n    element.setAttribute('class', value);\n  } else {\n    window['ShadyDOM']['nativeMethods']['setAttribute'].call(element, 'class', value);\n  }\n}\n\n/**\n * @param {Element | {is: string, extends: string}} element\n * @return {{is: string, typeExtension: string}}\n */\nexport function getIsExtends(element) {\n  let localName = element['localName'];\n  let is = '', typeExtension = '';\n  /*\n  NOTE: technically, this can be wrong for certain svg elements\n  with `-` in the name like `<font-face>`\n  */\n  if (localName) {\n    if (localName.indexOf('-') > -1) {\n      is = localName;\n    } else {\n      typeExtension = localName;\n      is = (element.getAttribute && element.getAttribute('is')) || '';\n    }\n  } else {\n    is = /** @type {?} */(element).is;\n    typeExtension = /** @type {?} */(element).extends;\n  }\n  return {is, typeExtension};\n}\n\n/**\n * @param {Element|DocumentFragment} element\n * @return {string}\n */\nexport function gatherStyleText(element) {\n  /** @type {!Array<string>} */\n  const styleTextParts = [];\n  const styles = /** @type {!NodeList<!HTMLStyleElement>} */(element.querySelectorAll('style'));\n  for (let i = 0; i < styles.length; i++) {\n    const style = styles[i];\n    if (isUnscopedStyle(style)) {\n      if (!nativeShadow) {\n        processUnscopedStyle(style);\n        style.parentNode.removeChild(style);\n      }\n    } else {\n      styleTextParts.push(style.textContent);\n      style.parentNode.removeChild(style);\n    }\n  }\n  return styleTextParts.join('').trim();\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {removeCustomPropAssignment, StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport {nativeShadow} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport * as StyleUtil from './style-util.js';\nimport * as RX from './common-regex.js';\nimport StyleInfo from './style-info.js';\n\n// TODO: dedupe with shady\n/**\n * @const {function(string):boolean}\n */\nconst matchesSelector = ((p) => p.matches || p.matchesSelector ||\n  p.mozMatchesSelector || p.msMatchesSelector ||\np.oMatchesSelector || p.webkitMatchesSelector)(window.Element.prototype);\n\nconst IS_IE = navigator.userAgent.match('Trident');\n\nconst XSCOPE_NAME = 'x-scope';\n\nclass StyleProperties {\n  get XSCOPE_NAME() {\n    return XSCOPE_NAME;\n  }\n/**\n * decorates styles with rule info and returns an array of used style property names\n *\n * @param {StyleNode} rules\n * @return {Array<string>}\n */\n  decorateStyles(rules) {\n    let self = this, props = {}, keyframes = [], ruleIndex = 0;\n    StyleUtil.forEachRule(rules, function(rule) {\n      self.decorateRule(rule);\n      // mark in-order position of ast rule in styles block, used for cache key\n      rule.index = ruleIndex++;\n      self.collectPropertiesInCssText(rule.propertyInfo.cssText, props);\n    }, function onKeyframesRule(rule) {\n      keyframes.push(rule);\n    });\n    // Cache all found keyframes rules for later reference:\n    rules._keyframes = keyframes;\n    // return this list of property names *consumes* in these styles.\n    let names = [];\n    for (let i in props) {\n      names.push(i);\n    }\n    return names;\n  }\n\n  // decorate a single rule with property info\n  decorateRule(rule) {\n    if (rule.propertyInfo) {\n      return rule.propertyInfo;\n    }\n    let info = {}, properties = {};\n    let hasProperties = this.collectProperties(rule, properties);\n    if (hasProperties) {\n      info.properties = properties;\n      // TODO(sorvell): workaround parser seeing mixins as additional rules\n      rule['rules'] = null;\n    }\n    info.cssText = this.collectCssText(rule);\n    rule.propertyInfo = info;\n    return info;\n  }\n\n  // collects the custom properties from a rule's cssText\n  collectProperties(rule, properties) {\n    let info = rule.propertyInfo;\n    if (info) {\n      if (info.properties) {\n        Object.assign(properties, info.properties);\n        return true;\n      }\n    } else {\n      let m, rx = RX.VAR_ASSIGN;\n      let cssText = rule['parsedCssText'];\n      let value;\n      let any;\n      while ((m = rx.exec(cssText))) {\n        // note: group 2 is var, 3 is mixin\n        value = (m[2] || m[3]).trim();\n        // value of 'inherit' or 'unset' is equivalent to not setting the property here\n        if (value !== 'inherit' || value !== 'unset') {\n          properties[m[1].trim()] = value;\n        }\n        any = true;\n      }\n      return any;\n    }\n\n  }\n\n  // returns cssText of properties that consume variables/mixins\n  collectCssText(rule) {\n    return this.collectConsumingCssText(rule['parsedCssText']);\n  }\n\n  // NOTE: we support consumption inside mixin assignment\n  // but not production, so strip out {...}\n  collectConsumingCssText(cssText) {\n    return cssText.replace(RX.BRACKETED, '')\n      .replace(RX.VAR_ASSIGN, '');\n  }\n\n  collectPropertiesInCssText(cssText, props) {\n    let m;\n    while ((m = RX.VAR_CONSUMED.exec(cssText))) {\n      let name = m[1];\n      // This regex catches all variable names, and following non-whitespace char\n      // If next char is not ':', then variable is a consumer\n      if (m[2] !== ':') {\n        props[name] = true;\n      }\n    }\n  }\n\n  // turns custom properties into realized values.\n  reify(props) {\n    // big perf optimization here: reify only *own* properties\n    // since this object has __proto__ of the element's scope properties\n    let names = Object.getOwnPropertyNames(props);\n    for (let i=0, n; i < names.length; i++) {\n      n = names[i];\n      props[n] = this.valueForProperty(props[n], props);\n    }\n  }\n\n  // given a property value, returns the reified value\n  // a property value may be:\n  // (1) a literal value like: red or 5px;\n  // (2) a variable value like: var(--a), var(--a, red), or var(--a, --b) or\n  // var(--a, var(--b));\n  // (3) a literal mixin value like { properties }. Each of these properties\n  // can have values that are: (a) literal, (b) variables, (c) @apply mixins.\n  valueForProperty(property, props) {\n    // case (1) default\n    // case (3) defines a mixin and we have to reify the internals\n    if (property) {\n      if (property.indexOf(';') >=0) {\n        property = this.valueForProperties(property, props);\n      } else {\n        // case (2) variable\n        let self = this;\n        let fn = function(prefix, value, fallback, suffix) {\n          if (!value) {\n            return prefix + suffix;\n          }\n          let propertyValue = self.valueForProperty(props[value], props);\n          // if value is \"initial\", then the variable should be treated as unset\n          if (!propertyValue || propertyValue === 'initial') {\n            // fallback may be --a or var(--a) or literal\n            propertyValue = self.valueForProperty(props[fallback] || fallback, props) ||\n            fallback;\n          } else if (propertyValue === 'apply-shim-inherit') {\n            // CSS build will replace `inherit` with `apply-shim-inherit`\n            // for use with native css variables.\n            // Since we have full control, we can use `inherit` directly.\n            propertyValue = 'inherit';\n          }\n          return prefix + (propertyValue || '') + suffix;\n        };\n        property = StyleUtil.processVariableAndFallback(property, fn);\n      }\n    }\n    return property && property.trim() || '';\n  }\n\n  // note: we do not yet support mixin within mixin\n  valueForProperties(property, props) {\n    let parts = property.split(';');\n    for (let i=0, p, m; i<parts.length; i++) {\n      if ((p = parts[i])) {\n        RX.MIXIN_MATCH.lastIndex = 0;\n        m = RX.MIXIN_MATCH.exec(p);\n        if (m) {\n          p = this.valueForProperty(props[m[1]], props);\n        } else {\n          let colon = p.indexOf(':');\n          if (colon !== -1) {\n            let pp = p.substring(colon);\n            pp = pp.trim();\n            pp = this.valueForProperty(pp, props) || pp;\n            p = p.substring(0, colon) + pp;\n          }\n        }\n        parts[i] = (p && p.lastIndexOf(';') === p.length - 1) ?\n          // strip trailing ;\n          p.slice(0, -1) :\n          p || '';\n      }\n    }\n    return parts.join(';');\n  }\n\n  applyProperties(rule, props) {\n    let output = '';\n    // dynamically added sheets may not be decorated so ensure they are.\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (rule.propertyInfo.cssText) {\n      output = this.valueForProperties(rule.propertyInfo.cssText, props);\n    }\n    rule['cssText'] = output;\n  }\n\n  // Apply keyframe transformations to the cssText of a given rule. The\n  // keyframeTransforms object is a map of keyframe names to transformer\n  // functions which take in cssText and spit out transformed cssText.\n  applyKeyframeTransforms(rule, keyframeTransforms) {\n    let input = rule['cssText'];\n    let output = rule['cssText'];\n    if (rule.hasAnimations == null) {\n      // Cache whether or not the rule has any animations to begin with:\n      rule.hasAnimations = RX.ANIMATION_MATCH.test(input);\n    }\n    // If there are no animations referenced, we can skip transforms:\n    if (rule.hasAnimations) {\n      let transform;\n      // If we haven't transformed this rule before, we iterate over all\n      // transforms:\n      if (rule.keyframeNamesToTransform == null) {\n        rule.keyframeNamesToTransform = [];\n        for (let keyframe in keyframeTransforms) {\n          transform = keyframeTransforms[keyframe];\n          output = transform(input);\n          // If the transform actually changed the CSS text, we cache the\n          // transform name for future use:\n          if (input !== output) {\n            input = output;\n            rule.keyframeNamesToTransform.push(keyframe);\n          }\n        }\n      } else {\n        // If we already have a list of keyframe names that apply to this\n        // rule, we apply only those keyframe name transforms:\n        for (let i = 0; i < rule.keyframeNamesToTransform.length; ++i) {\n          transform = keyframeTransforms[rule.keyframeNamesToTransform[i]];\n          input = transform(input);\n        }\n        output = input;\n      }\n    }\n    rule['cssText'] = output;\n  }\n\n  // Test if the rules in these styles matches the given `element` and if so,\n  // collect any custom properties into `props`.\n  /**\n   * @param {StyleNode} rules\n   * @param {Element} element\n   */\n  propertyDataFromStyles(rules, element) {\n    let props = {}, self = this;\n    // generates a unique key for these matches\n    let o = [];\n    // note: active rules excludes non-matching @media rules\n    StyleUtil.forEachRule(rules, function(rule) {\n      // TODO(sorvell): we could trim the set of rules at declaration\n      // time to only include ones that have properties\n      if (!rule.propertyInfo) {\n        self.decorateRule(rule);\n      }\n      // match element against transformedSelector: selector may contain\n      // unwanted uniquification and parsedSelector does not directly match\n      // for :host selectors.\n      let selectorToMatch = rule.transformedSelector || rule['parsedSelector'];\n      if (element && rule.propertyInfo.properties && selectorToMatch) {\n        if (matchesSelector.call(element, selectorToMatch)) {\n          self.collectProperties(rule, props);\n          // produce numeric key for these matches for lookup\n          addToBitMask(rule.index, o);\n        }\n      }\n    }, null, true);\n    return {properties: props, key: o};\n  }\n\n  /**\n   * @param {Element} scope\n   * @param {StyleNode} rule\n   * @param {string|undefined} cssBuild\n   * @param {function(Object)} callback\n   */\n  whenHostOrRootRule(scope, rule, cssBuild, callback) {\n    if (!rule.propertyInfo) {\n      this.decorateRule(rule);\n    }\n    if (!rule.propertyInfo.properties) {\n      return;\n    }\n    let {is, typeExtension} = StyleUtil.getIsExtends(scope);\n    let hostScope = is ?\n      StyleTransformer._calcHostScope(is, typeExtension) :\n      'html';\n    let parsedSelector = rule['parsedSelector'];\n    let isRoot = (parsedSelector === ':host > *' || parsedSelector === 'html');\n    let isHost = parsedSelector.indexOf(':host') === 0 && !isRoot;\n    // build info is either in scope (when scope is an element) or in the style\n    // when scope is the default scope; note: this allows default scope to have\n    // mixed mode built and unbuilt styles.\n    if (cssBuild === 'shady') {\n      // :root -> x-foo > *.x-foo for elements and html for custom-style\n      isRoot = parsedSelector === (hostScope + ' > *.' + hostScope) || parsedSelector.indexOf('html') !== -1;\n      // :host -> x-foo for elements, but sub-rules have .x-foo in them\n      isHost = !isRoot && parsedSelector.indexOf(hostScope) === 0;\n    }\n    if (cssBuild === 'shadow') {\n      isRoot = parsedSelector === ':host > *' || parsedSelector === 'html';\n      isHost = isHost && !isRoot;\n    }\n    if (!isRoot && !isHost) {\n      return;\n    }\n    let selectorToMatch = hostScope;\n    if (isHost) {\n      // need to transform :host under ShadowDOM because `:host` does not work with `matches`\n      if (nativeShadow && !rule.transformedSelector) {\n        // transform :host into a matchable selector\n        rule.transformedSelector =\n        StyleTransformer._transformRuleCss(\n          rule,\n          StyleTransformer._transformComplexSelector,\n          StyleTransformer._calcElementScope(is),\n          hostScope\n        );\n      }\n      selectorToMatch = rule.transformedSelector || hostScope;\n    }\n    callback({\n      selector: selectorToMatch,\n      isHost: isHost,\n      isRoot: isRoot\n    });\n  }\n/**\n * @param {Element} scope\n * @param {StyleNode} rules\n * @return {Object}\n */\n  hostAndRootPropertiesForScope(scope, rules) {\n    let hostProps = {}, rootProps = {}, self = this;\n    // note: active rules excludes non-matching @media rules\n    let cssBuild = rules && rules['__cssBuild'];\n    StyleUtil.forEachRule(rules, function(rule) {\n      // if scope is StyleDefaults, use _element for matchesSelector\n      self.whenHostOrRootRule(scope, rule, cssBuild, function(info) {\n        let element = scope._element || scope;\n        if (matchesSelector.call(element, info.selector)) {\n          if (info.isHost) {\n            self.collectProperties(rule, hostProps);\n          } else {\n            self.collectProperties(rule, rootProps);\n          }\n        }\n      });\n    }, null, true);\n    return {rootProps: rootProps, hostProps: hostProps};\n  }\n\n  /**\n   * @param {Element} element\n   * @param {Object} properties\n   * @param {string} scopeSelector\n   */\n  transformStyles(element, properties, scopeSelector) {\n    let self = this;\n    let {is, typeExtension} = StyleUtil.getIsExtends(element);\n    let hostSelector = StyleTransformer\n      ._calcHostScope(is, typeExtension);\n    let rxHostSelector = element.extends ?\n      '\\\\' + hostSelector.slice(0, -1) + '\\\\]' :\n      hostSelector;\n    let hostRx = new RegExp(RX.HOST_PREFIX + rxHostSelector +\n      RX.HOST_SUFFIX);\n    let rules = StyleInfo.get(element).styleRules;\n    let keyframeTransforms =\n      this._elementKeyframeTransforms(element, rules, scopeSelector);\n    return StyleTransformer.elementStyles(element, rules, function(rule) {\n      self.applyProperties(rule, properties);\n      if (!nativeShadow &&\n          !StyleUtil.isKeyframesSelector(rule) &&\n          rule['cssText']) {\n        // NOTE: keyframe transforms only scope munge animation names, so it\n        // is not necessary to apply them in ShadowDOM.\n        self.applyKeyframeTransforms(rule, keyframeTransforms);\n        self._scopeSelector(rule, hostRx, hostSelector, scopeSelector);\n      }\n    });\n  }\n\n  /**\n   * @param {Element} element\n   * @param {StyleNode} rules\n   * @param {string} scopeSelector\n   * @return {Object}\n   */\n  _elementKeyframeTransforms(element, rules, scopeSelector) {\n    let keyframesRules = rules._keyframes;\n    let keyframeTransforms = {};\n    if (!nativeShadow && keyframesRules) {\n      // For non-ShadowDOM, we transform all known keyframes rules in\n      // advance for the current scope. This allows us to catch keyframes\n      // rules that appear anywhere in the stylesheet:\n      for (let i = 0, keyframesRule = keyframesRules[i];\n           i < keyframesRules.length;\n           keyframesRule = keyframesRules[++i]) {\n        this._scopeKeyframes(keyframesRule, scopeSelector);\n        keyframeTransforms[keyframesRule['keyframesName']] =\n            this._keyframesRuleTransformer(keyframesRule);\n      }\n    }\n    return keyframeTransforms;\n  }\n\n  // Generate a factory for transforming a chunk of CSS text to handle a\n  // particular scoped keyframes rule.\n  /**\n   * @param {StyleNode} keyframesRule\n   * @return {function(string):string}\n   */\n  _keyframesRuleTransformer(keyframesRule) {\n    return function(cssText) {\n      return cssText.replace(\n          keyframesRule.keyframesNameRx,\n          keyframesRule.transformedKeyframesName);\n    };\n  }\n\n/**\n * Transforms `@keyframes` names to be unique for the current host.\n * Example: @keyframes foo-anim -> @keyframes foo-anim-x-foo-0\n *\n * @param {StyleNode} rule\n * @param {string} scopeId\n */\n  _scopeKeyframes(rule, scopeId) {\n    // Animation names are of the form [\\w-], so ensure that the name regex does not partially apply\n    // to similarly named keyframe names by checking for a word boundary at the beginning and\n    // a non-word boundary or `-` at the end.\n    rule.keyframesNameRx = new RegExp(`\\\\b${rule['keyframesName']}(?!\\\\B|-)`, 'g');\n    rule.transformedKeyframesName = rule['keyframesName'] + '-' + scopeId;\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    rule['selector'] = rule.transformedSelector.replace(\n        rule['keyframesName'], rule.transformedKeyframesName);\n  }\n\n  // Strategy: x scope shim a selector e.g. to scope `.x-foo-42` (via classes):\n  // non-host selector: .a.x-foo -> .x-foo-42 .a.x-foo\n  // host selector: x-foo.wide -> .x-foo-42.wide\n  // note: we use only the scope class (.x-foo-42) and not the hostSelector\n  // (x-foo) to scope :host rules; this helps make property host rules\n  // have low specificity. They are overrideable by class selectors but,\n  // unfortunately, not by type selectors (e.g. overriding via\n  // `.special` is ok, but not by `x-foo`).\n  /**\n   * @param {StyleNode} rule\n   * @param {RegExp} hostRx\n   * @param {string} hostSelector\n   * @param {string} scopeId\n   */\n  _scopeSelector(rule, hostRx, hostSelector, scopeId) {\n    rule.transformedSelector = rule.transformedSelector || rule['selector'];\n    let selector = rule.transformedSelector;\n    let scope = '.' + scopeId;\n    let parts = selector.split(',');\n    for (let i=0, l=parts.length, p; (i<l) && (p=parts[i]); i++) {\n      parts[i] = p.match(hostRx) ?\n        p.replace(hostSelector, scope) :\n        scope + ' ' + p;\n    }\n    rule['selector'] = parts.join(',');\n  }\n\n  /**\n   * @param {Element} element\n   * @param {string} selector\n   * @param {string} old\n   */\n  applyElementScopeSelector(element, selector, old) {\n    let c = element.getAttribute('class') || '';\n    let v = c;\n    if (old) {\n      v = c.replace(\n        new RegExp('\\\\s*' + XSCOPE_NAME + '\\\\s*' + old + '\\\\s*', 'g'), ' ');\n    }\n    v += (v ? ' ' : '') + XSCOPE_NAME + ' ' + selector;\n    if (c !== v) {\n      StyleUtil.setElementClassRaw(element, v);\n    }\n  }\n\n  /**\n   * @param {HTMLElement} element\n   * @param {Object} properties\n   * @param {string} selector\n   * @param {HTMLStyleElement} style\n   * @return {HTMLStyleElement}\n   */\n  applyElementStyle(element, properties, selector, style) {\n    // calculate cssText to apply\n    let cssText = style ? style.textContent || '' :\n      this.transformStyles(element, properties, selector);\n    // if shady and we have a cached style that is not style, decrement\n    let styleInfo = StyleInfo.get(element);\n    let s = styleInfo.customStyle;\n    if (s && !nativeShadow && (s !== style)) {\n      s['_useCount']--;\n      if (s['_useCount'] <= 0 && s.parentNode) {\n        s.parentNode.removeChild(s);\n      }\n    }\n    // apply styling always under native or if we generated style\n    // or the cached style is not in document(!)\n    if (nativeShadow) {\n      // update existing style only under native\n      if (styleInfo.customStyle) {\n        styleInfo.customStyle.textContent = cssText;\n        style = styleInfo.customStyle;\n      // otherwise, if we have css to apply, do so\n      } else if (cssText) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        style = StyleUtil.applyCss(cssText, selector, element.shadowRoot,\n          styleInfo.placeholder);\n      }\n    } else {\n      // shady and no cache hit\n      if (!style) {\n        // apply css after the scope style of the element to help with\n        // style precedence rules.\n        if (cssText) {\n          style = StyleUtil.applyCss(cssText, selector, null,\n            styleInfo.placeholder);\n        }\n      // shady and cache hit but not in document\n      } else if (!style.parentNode) {\n        if (IS_IE && cssText.indexOf('@media') > -1) {\n            // @media rules may be stale in IE 10 and 11\n            // refresh the text content of the style to revalidate them.\n          style.textContent = cssText;\n        }\n        StyleUtil.applyStyle(style, null, styleInfo.placeholder);\n      }\n    }\n    // ensure this style is our custom style and increment its use count.\n    if (style) {\n      style['_useCount'] = style['_useCount'] || 0;\n      // increment use count if we changed styles\n      if (styleInfo.customStyle != style) {\n        style['_useCount']++;\n      }\n      styleInfo.customStyle = style;\n    }\n    return style;\n  }\n\n  /**\n   * @param {Element} style\n   * @param {Object} properties\n   */\n  applyCustomStyle(style, properties) {\n    let rules = StyleUtil.rulesForStyle(/** @type {HTMLStyleElement} */(style));\n    let self = this;\n    style.textContent = StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      let css = rule['cssText'] = rule['parsedCssText'];\n      if (rule.propertyInfo && rule.propertyInfo.cssText) {\n        // remove property assignments\n        // so next function isn't confused\n        // NOTE: we have 3 categories of css:\n        // (1) normal properties,\n        // (2) custom property assignments (--foo: red;),\n        // (3) custom property usage: border: var(--foo); @apply(--foo);\n        // In elements, 1 and 3 are separated for efficiency; here they\n        // are not and this makes this case unique.\n        css = removeCustomPropAssignment(/** @type {string} */(css));\n        // replace with reified properties, scenario is same as mixin\n        rule['cssText'] = self.valueForProperties(css, properties);\n      }\n    });\n  }\n}\n\n/**\n * @param {number} n\n * @param {Array<number>} bits\n */\nfunction addToBitMask(n, bits) {\n  let o = parseInt(n / 32, 10);\n  let v = 1 << (n % 32);\n  bits[o] = (bits[o] || 0) | v;\n}\n\nexport default new StyleProperties();","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport {getIsExtends} from './style-util.js';\n\nexport let flush = function() {};\n\n/**\n * @param {HTMLElement} element\n * @return {!Array<string>}\n */\nfunction getClasses(element) {\n  let classes = [];\n  if (element.classList) {\n    classes = Array.from(element.classList);\n  } else if (element instanceof window['SVGElement'] && element.hasAttribute('class')) {\n    classes = element.getAttribute('class').split(/\\s+/);\n  }\n  return classes;\n}\n\n/**\n * @param {HTMLElement} element\n * @return {string}\n */\nfunction getCurrentScope(element) {\n  let classes = getClasses(element);\n  let idx = classes.indexOf(StyleTransformer.SCOPE_NAME);\n  if (idx > -1) {\n    return classes[idx + 1];\n  }\n  return '';\n}\n\n/**\n * @param {Array<MutationRecord|null>|null} mxns\n */\nfunction handler(mxns) {\n  for (let x=0; x < mxns.length; x++) {\n    let mxn = mxns[x];\n    if (mxn.target === document.documentElement ||\n      mxn.target === document.head) {\n      continue;\n    }\n    for (let i=0; i < mxn.addedNodes.length; i++) {\n      let n = mxn.addedNodes[i];\n      if (n.nodeType !== Node.ELEMENT_NODE) {\n        continue;\n      }\n      n = /** @type {HTMLElement} */(n); // eslint-disable-line no-self-assign\n      let root = n.getRootNode();\n      let currentScope = getCurrentScope(n);\n      // node was scoped, but now is in document\n      if (currentScope && root === n.ownerDocument) {\n        StyleTransformer.dom(n, currentScope, true);\n      } else if (root.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {\n        let newScope;\n        let host = /** @type {ShadowRoot} */(root).host;\n        // element may no longer be in a shadowroot\n        if (!host) {\n          continue;\n        }\n        newScope = getIsExtends(host).is;\n        if (currentScope === newScope) {\n          // make sure all the subtree elements are scoped correctly\n          let unscoped = window['ShadyDOM']['nativeMethods']['querySelectorAll'].call(\n            n, `:not(.${StyleTransformer.SCOPE_NAME})`);\n          for (let j = 0; j < unscoped.length; j++) {\n            StyleTransformer.element(unscoped[j], currentScope);\n          }\n          continue;\n        }\n        if (currentScope) {\n          StyleTransformer.dom(n, currentScope, true);\n        }\n        StyleTransformer.dom(n, newScope);\n      }\n    }\n  }\n}\n\nif (!nativeShadow) {\n  let observer = new MutationObserver(handler);\n  let start = (node) => {\n    observer.observe(node, {childList: true, subtree: true});\n  }\n  let nativeCustomElements = (window['customElements'] &&\n    !window['customElements']['polyfillWrapFlushCallback']);\n  // need to start immediately with native custom elements\n  // TODO(dfreedm): with polyfilled HTMLImports and native custom elements\n  // excessive mutations may be observed; this can be optimized via cooperation\n  // with the HTMLImports polyfill.\n  if (nativeCustomElements) {\n    start(document);\n  } else {\n    let delayedStart = () => {\n      start(document.body);\n    }\n    // use polyfill timing if it's available\n    if (window['HTMLImports']) {\n      window['HTMLImports']['whenReady'](delayedStart);\n    // otherwise push beyond native imports being ready\n    // which requires RAF + readystate interactive.\n    } else {\n      requestAnimationFrame(function() {\n        if (document.readyState === 'loading') {\n          let listener = function() {\n            delayedStart();\n            document.removeEventListener('readystatechange', listener);\n          }\n          document.addEventListener('readystatechange', listener);\n        } else {\n          delayedStart();\n        }\n      });\n    }\n  }\n\n  flush = function() {\n    handler(observer.takeRecords());\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\nimport templateMap from './template-map.js';\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\n/*\n * Utilities for handling invalidating apply-shim mixins for a given template.\n *\n * The invalidation strategy involves keeping track of the \"current\" version of a template's mixins, and updating that count when a mixin is invalidated.\n * The template\n */\n\n/** @const {string} */\nconst CURRENT_VERSION = '_applyShimCurrentVersion';\n\n/** @const {string} */\nconst NEXT_VERSION = '_applyShimNextVersion';\n\n/** @const {string} */\nconst VALIDATING_VERSION = '_applyShimValidatingVersion';\n\n/**\n * @const {Promise<void>}\n */\nconst promise = Promise.resolve();\n\n/**\n * @param {string} elementName\n */\nexport function invalidate(elementName){\n  let template = templateMap[elementName];\n  if (template) {\n    invalidateTemplate(template);\n  }\n}\n\n/**\n * This function can be called multiple times to mark a template invalid\n * and signal that the style inside must be regenerated.\n *\n * Use `startValidatingTemplate` to begin an asynchronous validation cycle.\n * During that cycle, call `templateIsValidating` to see if the template must\n * be revalidated\n * @param {HTMLTemplateElement} template\n */\nexport function invalidateTemplate(template) {\n  // default the current version to 0\n  template[CURRENT_VERSION] = template[CURRENT_VERSION] || 0;\n  // ensure the \"validating for\" flag exists\n  template[VALIDATING_VERSION] = template[VALIDATING_VERSION] || 0;\n  // increment the next version\n  template[NEXT_VERSION] = (template[NEXT_VERSION] || 0) + 1;\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValid(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValid(template);\n  }\n  return true;\n}\n\n/**\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValid(template) {\n  return template[CURRENT_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValidating(elementName) {\n  let template = templateMap[elementName];\n  if (template) {\n    return templateIsValidating(template);\n  }\n  return false;\n}\n\n/**\n * Returns true if the template is currently invalid and `startValidating` has been called since the last invalidation.\n * If false, the template must be validated.\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValidating(template) {\n  return !templateIsValid(template) && template[VALIDATING_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * the template is marked as `validating` for one microtask so that all instances\n * found in the tree crawl of `applyStyle` will update themselves,\n * but the template will only be updated once.\n * @param {string} elementName\n*/\nexport function startValidating(elementName) {\n  let template = templateMap[elementName];\n  startValidatingTemplate(template);\n}\n\n/**\n * Begin an asynchronous invalidation cycle.\n * This should be called after every validation of a template\n *\n * After one microtask, the template will be marked as valid until the next call to `invalidateTemplate`\n * @param {HTMLTemplateElement} template\n */\nexport function startValidatingTemplate(template) {\n  // remember that the current \"next version\" is the reason for this validation cycle\n  template[VALIDATING_VERSION] = template[NEXT_VERSION];\n  // however, there only needs to be one async task to clear the counters\n  if (!template._validating) {\n    template._validating = true;\n    promise.then(function() {\n      // sync the current version to let future invalidations cause a refresh cycle\n      template[CURRENT_VERSION] = template[NEXT_VERSION];\n      template._validating = false;\n    });\n  }\n}\n\n/**\n * @return {boolean}\n */\nexport function elementsAreInvalid() {\n  for (let elementName in templateMap) {\n    let template = templateMap[elementName];\n    if (!templateIsValid(template)) {\n      return true;\n    }\n  }\n  return false;\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {Promise<void>} */\nlet readyPromise = null;\n\n/** @type {?function(?function())} */\nlet whenReady = window['HTMLImports'] && window['HTMLImports']['whenReady'] || null;\n\n/** @type {function()} */\nlet resolveFn;\n\n/**\n * @param {?function()} callback\n */\nexport default function documentWait(callback) {\n  requestAnimationFrame(function() {\n    if (whenReady) {\n      whenReady(callback)\n    } else {\n      if (!readyPromise) {\n        readyPromise = new Promise((resolve) => {resolveFn = resolve});\n        if (document.readyState === 'complete') {\n          resolveFn();\n        } else {\n          document.addEventListener('readystatechange', () => {\n            if (document.readyState === 'complete') {\n              resolveFn();\n            }\n          });\n        }\n      }\n      readyPromise.then(function(){ callback && callback(); });\n    }\n  });\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js';\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n  // remove previous properties\n  for (let p in properties) {\n    // NOTE: for bc with shim, don't apply null values.\n    if (p === null) {\n      element.style.removeProperty(p);\n    } else {\n      element.style.setProperty(p, properties[p]);\n    }\n  }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n  /**\n   * @const {string}\n   */\n  const value = window.getComputedStyle(element).getPropertyValue(property);\n  if (!value) {\n    return '';\n  } else {\n    return value.trim();\n  }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n  const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n  // reset state of the regexes\n  MIXIN_MATCH.lastIndex = 0;\n  VAR_ASSIGN.lastIndex = 0;\n  return has;\n}\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n(function(scope) {\n\n  'use strict';\n\n  // defaultPrevented is broken in IE.\n  // https://connect.microsoft.com/IE/feedback/details/790389/event-defaultprevented-returns-false-after-preventdefault-was-called\n  var workingDefaultPrevented = (function() {\n    var e = document.createEvent('Event');\n    e.initEvent('foo', true, true);\n    e.preventDefault();\n    return e.defaultPrevented;\n  })();\n\n  if (!workingDefaultPrevented) {\n    var origPreventDefault = Event.prototype.preventDefault;\n    Event.prototype.preventDefault = function() {\n      if (!this.cancelable) {\n        return;\n      }\n\n      origPreventDefault.call(this);\n\n      Object.defineProperty(this, 'defaultPrevented', {\n        get: function() {\n          return true;\n        },\n        configurable: true\n      });\n    };\n  }\n\n  var isIE = /Trident/.test(navigator.userAgent);\n\n  // CustomEvent constructor shim\n  if (!window.CustomEvent || isIE && (typeof window.CustomEvent !== 'function')) {\n    window.CustomEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('CustomEvent');\n      e.initCustomEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable), params.detail);\n      return e;\n    };\n    window.CustomEvent.prototype = window.Event.prototype;\n  }\n\n  // Event constructor shim\n  if (!window.Event || isIE && (typeof window.Event !== 'function')) {\n    var origEvent = window.Event;\n    window.Event = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('Event');\n      e.initEvent(inType, Boolean(params.bubbles), Boolean(params.cancelable));\n      return e;\n    };\n    if (origEvent) {\n      for (var i in origEvent) {\n        window.Event[i] = origEvent[i];\n      }\n    }\n    window.Event.prototype = origEvent.prototype;\n  }\n\n  if (!window.MouseEvent || isIE && (typeof window.MouseEvent !== 'function')) {\n    var origMouseEvent = window.MouseEvent;\n    window.MouseEvent = function(inType, params) {\n      params = params || {};\n      var e = document.createEvent('MouseEvent');\n      e.initMouseEvent(inType,\n        Boolean(params.bubbles), Boolean(params.cancelable),\n        params.view || window, params.detail,\n        params.screenX, params.screenY, params.clientX, params.clientY,\n        params.ctrlKey, params.altKey, params.shiftKey, params.metaKey,\n        params.button, params.relatedTarget);\n      return e;\n    };\n    if (origMouseEvent) {\n      for (var i in origMouseEvent) {\n        window.MouseEvent[i] = origMouseEvent[i];\n      }\n    }\n    window.MouseEvent.prototype = origMouseEvent.prototype;\n  }\n\n  // ES6 stuff\n  if (!Array.from) {\n    Array.from = function (object) {\n      return [].slice.call(object);\n    };\n  }\n\n  if (!Object.assign) {\n    var assign = function(target, source) {\n      var n$ = Object.getOwnPropertyNames(source);\n      for (var i=0, p; i < n$.length; i++) {\n        p = n$[i];\n        target[p] = source[p];\n      }\n    }\n\n    Object.assign = function(target, sources) {\n      var args = [].slice.call(arguments, 1);\n      for (var i=0, s; i < args.length; i++) {\n        s = args[i];\n        if (s) {\n          assign(target, s);\n        }\n      }\n      return target;\n    }\n  }\n\n})(window.WebComponents);\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n// minimal template polyfill\n(function() {\n  'use strict';\n\n  var needsTemplate = (typeof HTMLTemplateElement === 'undefined');\n  var brokenDocFragment = !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment);\n  var needsDocFrag = false;\n\n  // NOTE: Replace DocumentFragment to work around IE11 bug that\n  // casues children of a document fragment modified while\n  // there is a mutation observer to not have a parentNode, or\n  // have a broken parentNode (!?!)\n  if (/Trident/.test(navigator.userAgent)) {\n    (function() {\n\n      needsDocFrag = true;\n\n      var origCloneNode = Node.prototype.cloneNode;\n      Node.prototype.cloneNode = function cloneNode(deep) {\n        var newDom = origCloneNode.call(this, deep);\n        if (this instanceof DocumentFragment) {\n          newDom.__proto__ = DocumentFragment.prototype;\n        }\n        return newDom;\n      };\n\n      // IE's DocumentFragment querySelector code doesn't work when\n      // called on an element instance\n      DocumentFragment.prototype.querySelectorAll = HTMLElement.prototype.querySelectorAll;\n      DocumentFragment.prototype.querySelector = HTMLElement.prototype.querySelector;\n\n      Object.defineProperties(DocumentFragment.prototype, {\n        'nodeType': {\n          get: function () {\n            return Node.DOCUMENT_FRAGMENT_NODE;\n          },\n          configurable: true\n        },\n\n        'localName': {\n          get: function () {\n            return undefined;\n          },\n          configurable: true\n        },\n\n        'nodeName': {\n          get: function () {\n            return '#document-fragment';\n          },\n          configurable: true\n        }\n      });\n\n      var origInsertBefore = Node.prototype.insertBefore;\n      function insertBefore(newNode, refNode) {\n        if (newNode instanceof DocumentFragment) {\n          var child;\n          while ((child = newNode.firstChild)) {\n            origInsertBefore.call(this, child, refNode);\n          }\n        } else {\n          origInsertBefore.call(this, newNode, refNode);\n        }\n        return newNode;\n      }\n      Node.prototype.insertBefore = insertBefore;\n\n      var origAppendChild = Node.prototype.appendChild;\n      Node.prototype.appendChild = function appendChild(child) {\n        if (child instanceof DocumentFragment) {\n          insertBefore.call(this, child, null);\n        } else {\n          origAppendChild.call(this, child);\n        }\n        return child;\n      };\n\n      var origRemoveChild = Node.prototype.removeChild;\n      var origReplaceChild = Node.prototype.replaceChild;\n      Node.prototype.replaceChild = function replaceChild(newChild, oldChild) {\n        if (newChild instanceof DocumentFragment) {\n          insertBefore.call(this, newChild, oldChild);\n          origRemoveChild.call(this, oldChild);\n        } else {\n          origReplaceChild.call(this, newChild, oldChild);\n        }\n        return oldChild;\n      };\n\n      Document.prototype.createDocumentFragment = function createDocumentFragment() {\n        var frag = this.createElement('df');\n        frag.__proto__ = DocumentFragment.prototype;\n        return frag;\n      };\n\n      var origImportNode = Document.prototype.importNode;\n      Document.prototype.importNode = function importNode(impNode, deep) {\n        deep = deep || false;\n        var newNode = origImportNode.call(this, impNode, deep);\n        if (impNode instanceof DocumentFragment) {\n          newNode.__proto__ = DocumentFragment.prototype;\n        }\n        return newNode;\n      };\n    })();\n  }\n\n  // NOTE: we rely on this cloneNode not causing element upgrade.\n  // This means this polyfill must load before the CE polyfill and\n  // this would need to be re-worked if a browser supports native CE\n  // but not <template>.\n  var capturedCloneNode = Node.prototype.cloneNode;\n  var capturedCreateElement = Document.prototype.createElement;\n  var capturedImportNode = Document.prototype.importNode;\n  var capturedRemoveChild = Node.prototype.removeChild;\n  var capturedAppendChild = Node.prototype.appendChild;\n  var capturedReplaceChild = Node.prototype.replaceChild;\n\n  var elementQuerySelectorAll = Element.prototype.querySelectorAll;\n  var docQuerySelectorAll = Document.prototype.querySelectorAll;\n  var fragQuerySelectorAll = DocumentFragment.prototype.querySelectorAll;\n\n  var scriptSelector = 'script:not([type]),script[type=\"application/javascript\"],script[type=\"text/javascript\"]';\n\n  function QSA(node, selector) {\n    // IE 11 throws a SyntaxError with `scriptSelector` if the node has no children due to the `:not([type])` syntax\n    if (!node.childNodes.length) {\n      return [];\n    }\n    switch (node.nodeType) {\n      case Node.DOCUMENT_NODE:\n        return docQuerySelectorAll.call(node, selector);\n      case Node.DOCUMENT_FRAGMENT_NODE:\n        return fragQuerySelectorAll.call(node, selector);\n      default:\n        return elementQuerySelectorAll.call(node, selector);\n    }\n  }\n\n  // returns true if nested templates cannot be cloned (they cannot be on\n  // some impl's like Safari 8 and Edge)\n  // OR if cloning a document fragment does not result in a document fragment\n  var needsCloning = (function() {\n    if (!needsTemplate) {\n      var t = document.createElement('template');\n      var t2 = document.createElement('template');\n      t2.content.appendChild(document.createElement('div'));\n      t.content.appendChild(t2);\n      var clone = t.cloneNode(true);\n      return (clone.content.childNodes.length === 0 || clone.content.firstChild.content.childNodes.length === 0\n        || brokenDocFragment);\n    }\n  })();\n\n  var TEMPLATE_TAG = 'template';\n  var PolyfilledHTMLTemplateElement = function() {};\n\n  if (needsTemplate) {\n\n    var contentDoc = document.implementation.createHTMLDocument('template');\n    var canDecorate = true;\n\n    var templateStyle = document.createElement('style');\n    templateStyle.textContent = TEMPLATE_TAG + '{display:none;}';\n\n    var head = document.head;\n    head.insertBefore(templateStyle, head.firstElementChild);\n\n    /**\n      Provides a minimal shim for the <template> element.\n    */\n    PolyfilledHTMLTemplateElement.prototype = Object.create(HTMLElement.prototype);\n\n\n    // if elements do not have `innerHTML` on instances, then\n    // templates can be patched by swizzling their prototypes.\n    var canProtoPatch =\n      !(document.createElement('div').hasOwnProperty('innerHTML'));\n\n    /**\n      The `decorate` method moves element children to the template's `content`.\n      NOTE: there is no support for dynamically adding elements to templates.\n    */\n    PolyfilledHTMLTemplateElement.decorate = function(template) {\n      // if the template is decorated, return fast\n      if (template.content) {\n        return;\n      }\n      template.content = contentDoc.createDocumentFragment();\n      var child;\n      while ((child = template.firstChild)) {\n        capturedAppendChild.call(template.content, child);\n      }\n      // NOTE: prefer prototype patching for performance and\n      // because on some browsers (IE11), re-defining `innerHTML`\n      // can result in intermittent errors.\n      if (canProtoPatch) {\n        template.__proto__ = PolyfilledHTMLTemplateElement.prototype;\n      } else {\n        template.cloneNode = function(deep) {\n          return PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n        };\n        // add innerHTML to template, if possible\n        // Note: this throws on Safari 7\n        if (canDecorate) {\n          try {\n            defineInnerHTML(template);\n            defineOuterHTML(template);\n          } catch (err) {\n            canDecorate = false;\n          }\n        }\n      }\n      // bootstrap recursively\n      PolyfilledHTMLTemplateElement.bootstrap(template.content);\n    };\n\n    var defineInnerHTML = function defineInnerHTML(obj) {\n      Object.defineProperty(obj, 'innerHTML', {\n        get: function() {\n          var o = '';\n          for (var e = this.content.firstChild; e; e = e.nextSibling) {\n            o += e.outerHTML || escapeData(e.data);\n          }\n          return o;\n        },\n        set: function(text) {\n          contentDoc.body.innerHTML = text;\n          PolyfilledHTMLTemplateElement.bootstrap(contentDoc);\n          while (this.content.firstChild) {\n            capturedRemoveChild.call(this.content, this.content.firstChild);\n          }\n          while (contentDoc.body.firstChild) {\n            capturedAppendChild.call(this.content, contentDoc.body.firstChild);\n          }\n        },\n        configurable: true\n      });\n    };\n\n    var defineOuterHTML = function defineOuterHTML(obj) {\n      Object.defineProperty(obj, 'outerHTML', {\n        get: function() {\n          return '<' + TEMPLATE_TAG + '>' + this.innerHTML + '</' + TEMPLATE_TAG + '>';\n        },\n        set: function(innerHTML) {\n          if (this.parentNode) {\n            contentDoc.body.innerHTML = innerHTML;\n            var docFrag = this.ownerDocument.createDocumentFragment();\n            while (contentDoc.body.firstChild) {\n              capturedAppendChild.call(docFrag, contentDoc.body.firstChild);\n            }\n            capturedReplaceChild.call(this.parentNode, docFrag, this);\n          } else {\n            throw new Error(\"Failed to set the 'outerHTML' property on 'Element': This element has no parent node.\");\n          }\n        },\n        configurable: true\n      });\n    };\n\n    defineInnerHTML(PolyfilledHTMLTemplateElement.prototype);\n    defineOuterHTML(PolyfilledHTMLTemplateElement.prototype);\n\n    /**\n      The `bootstrap` method is called automatically and \"fixes\" all\n      <template> elements in the document referenced by the `doc` argument.\n    */\n    PolyfilledHTMLTemplateElement.bootstrap = function bootstrap(doc) {\n      var templates = QSA(doc, TEMPLATE_TAG);\n      for (var i=0, l=templates.length, t; (i<l) && (t=templates[i]); i++) {\n        PolyfilledHTMLTemplateElement.decorate(t);\n      }\n    };\n\n    // auto-bootstrapping for main document\n    document.addEventListener('DOMContentLoaded', function() {\n      PolyfilledHTMLTemplateElement.bootstrap(document);\n    });\n\n    // Patch document.createElement to ensure newly created templates have content\n    Document.prototype.createElement = function createElement() {\n      var el = capturedCreateElement.apply(this, arguments);\n      if (el.localName === 'template') {\n        PolyfilledHTMLTemplateElement.decorate(el);\n      }\n      return el;\n    };\n\n    var escapeDataRegExp = /[&\\u00A0<>]/g;\n\n    var escapeReplace = function escapeReplace(c) {\n      switch (c) {\n        case '&':\n          return '&amp;';\n        case '<':\n          return '&lt;';\n        case '>':\n          return '&gt;';\n        case '\\u00A0':\n          return '&nbsp;';\n      }\n    };\n\n    var escapeData = function escapeData(s) {\n      return s.replace(escapeDataRegExp, escapeReplace);\n    };\n  }\n\n  // make cloning/importing work!\n  if (needsTemplate || needsCloning) {\n\n    PolyfilledHTMLTemplateElement._cloneNode = function _cloneNode(template, deep) {\n      var clone = capturedCloneNode.call(template, false);\n      // NOTE: decorate doesn't auto-fix children because they are already\n      // decorated so they need special clone fixup.\n      if (this.decorate) {\n        this.decorate(clone);\n      }\n      if (deep) {\n        // NOTE: use native clone node to make sure CE's wrapped\n        // cloneNode does not cause elements to upgrade.\n        capturedAppendChild.call(clone.content, capturedCloneNode.call(template.content, true));\n        // now ensure nested templates are cloned correctly.\n        fixClonedDom(clone.content, template.content);\n      }\n      return clone;\n    };\n\n    // Given a source and cloned subtree, find <template>'s in the cloned\n    // subtree and replace them with cloned <template>'s from source.\n    // We must do this because only the source templates have proper .content.\n    var fixClonedDom = function fixClonedDom(clone, source) {\n      // do nothing if cloned node is not an element\n      if (!source.querySelectorAll) return;\n      // these two lists should be coincident\n      var s$ = QSA(source, TEMPLATE_TAG);\n      if (s$.length === 0) {\n        return;\n      }\n      var t$ = QSA(clone, TEMPLATE_TAG);\n      for (var i=0, l=t$.length, t, s; i<l; i++) {\n        s = s$[i];\n        t = t$[i];\n        if (PolyfilledHTMLTemplateElement && PolyfilledHTMLTemplateElement.decorate) {\n          PolyfilledHTMLTemplateElement.decorate(s);\n        }\n        capturedReplaceChild.call(t.parentNode, cloneNode.call(s, true), t);\n      }\n    };\n\n    // make sure scripts inside of a cloned template are executable\n    var fixClonedScripts = function fixClonedScripts(fragment) {\n      var scripts = QSA(fragment, scriptSelector);\n      for (var ns, s, i = 0; i < scripts.length; i++) {\n        s = scripts[i];\n        ns = capturedCreateElement.call(document, 'script');\n        ns.textContent = s.textContent;\n        var attrs = s.attributes;\n        for (var ai = 0, a; ai < attrs.length; ai++) {\n          a = attrs[ai];\n          ns.setAttribute(a.name, a.value);\n        }\n        capturedReplaceChild.call(s.parentNode, ns, s);\n      }\n    };\n\n    // override all cloning to fix the cloned subtree to contain properly\n    // cloned templates.\n    var cloneNode = Node.prototype.cloneNode = function cloneNode(deep) {\n      var dom;\n      // workaround for Edge bug cloning documentFragments\n      // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/8619646/\n      if (!needsDocFrag && brokenDocFragment && this instanceof DocumentFragment) {\n        if (!deep) {\n          return this.ownerDocument.createDocumentFragment();\n        } else {\n          dom = importNode.call(this.ownerDocument, this, true);\n        }\n      } else if (this.nodeType === Node.ELEMENT_NODE && this.localName === TEMPLATE_TAG) {\n        dom = PolyfilledHTMLTemplateElement._cloneNode(this, deep);\n      } else {\n        dom = capturedCloneNode.call(this, deep);\n      }\n      // template.content is cloned iff `deep`.\n      if (deep) {\n        fixClonedDom(dom, this);\n      }\n      return dom;\n    };\n\n    // NOTE: we are cloning instead of importing <template>'s.\n    // However, the ownerDocument of the cloned template will be correct!\n    // This is because the native import node creates the right document owned\n    // subtree and `fixClonedDom` inserts cloned templates into this subtree,\n    // thus updating the owner doc.\n    var importNode = Document.prototype.importNode = function importNode(element, deep) {\n      deep = deep || false;\n      if (element.localName === TEMPLATE_TAG) {\n        return PolyfilledHTMLTemplateElement._cloneNode(element, deep);\n      } else {\n        var dom = capturedImportNode.call(this, element, deep);\n        if (deep) {\n          fixClonedDom(dom, element);\n          fixClonedScripts(dom);\n        }\n        return dom;\n      }\n    };\n  }\n\n  if (needsTemplate) {\n    window.HTMLTemplateElement = PolyfilledHTMLTemplateElement;\n  }\n\n})();\n","import Promise from './es6-promise/promise';\nimport polyfill from './es6-promise/polyfill';\n\n// Strange compat..\nPromise.polyfill = polyfill;\nPromise.Promise = Promise;\nexport default Promise;\n","import Promise from './es6-promise';\nPromise.polyfill();\nexport default Promise;\n","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n'use strict';\n\n// Establish scope.\nwindow['WebComponents'] = window['WebComponents'] || {'flags':{}};\n\n// loading script\nlet file = 'webcomponents-lite.js';\nlet script = document.querySelector('script[src*=\"' + file + '\"]');\nlet flagMatcher = /wc-(.+)/;\n\n// Flags. Convert url arguments to flags\nlet flags = {};\nif (!flags['noOpts']) {\n  // from url\n  location.search.slice(1).split('&').forEach(function(option) {\n    let parts = option.split('=');\n    let match;\n    if (parts[0] && (match = parts[0].match(flagMatcher))) {\n      flags[match[1]] = parts[1] || true;\n    }\n  });\n  // from script\n  if (script) {\n    for (let i=0, a; (a=script.attributes[i]); i++) {\n      if (a.name !== 'src') {\n        flags[a.name] = a.value || true;\n      }\n    }\n  }\n  // log flags\n  if (flags['log'] && flags['log']['split']) {\n    let parts = flags['log'].split(',');\n    flags['log'] = {};\n    parts.forEach(function(f) {\n      flags['log'][f] = true;\n    });\n  } else {\n    flags['log'] = {};\n  }\n}\n\n// exports\nwindow['WebComponents']['flags'] = flags;\nlet forceShady = flags['shadydom'];\nif (forceShady) {\n  window['ShadyDOM'] = window['ShadyDOM'] || {};\n  window['ShadyDOM']['force'] = forceShady;\n}\n\nlet forceCE = flags['register'] || flags['ce'];\nif (forceCE && window['customElements']) {\n  window['customElements']['forcePolyfill'] = forceCE;\n}","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport let appendChild = Element.prototype.appendChild;\nexport let insertBefore = Element.prototype.insertBefore;\nexport let removeChild = Element.prototype.removeChild;\nexport let setAttribute = Element.prototype.setAttribute;\nexport let removeAttribute = Element.prototype.removeAttribute;\nexport let cloneNode = Element.prototype.cloneNode;\nexport let importNode = Document.prototype.importNode;\nexport let addEventListener = Element.prototype.addEventListener;\nexport let removeEventListener = Element.prototype.removeEventListener;\nexport let windowAddEventListener = Window.prototype.addEventListener;\nexport let windowRemoveEventListener = Window.prototype.removeEventListener;\nexport let dispatchEvent = Element.prototype.dispatchEvent;\nexport let querySelector = Element.prototype.querySelector;\nexport let querySelectorAll = Element.prototype.querySelectorAll;\nexport let contains = Node.prototype.contains || HTMLElement.prototype.contains;\n","/**\n@license\nCopyright (c) 2016 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/**\n * Patches elements that interacts with ShadyDOM\n * such that tree traversal and mutation apis act like they would under\n * ShadowDOM.\n *\n * This import enables seemless interaction with ShadyDOM powered\n * custom elements, enabling better interoperation with 3rd party code,\n * libraries, and frameworks that use DOM tree manipulation apis.\n */\n\nimport * as utils from './utils.js';\nimport {flush, enqueue} from './flush.js';\nimport {observeChildren, unobserveChildren, filterMutations} from './observe-changes.js';\nimport * as nativeMethods from './native-methods.js';\nimport * as nativeTree from './native-tree.js';\nimport {patchBuiltins} from './patch-builtins.js';\nimport {patchEvents} from './patch-events.js';\nimport {ShadyRoot} from './attach-shadow.js';\n\nif (utils.settings.inUse) {\n  let ShadyDOM = {\n    // TODO(sorvell): remove when Polymer does not depend on this.\n    'inUse': utils.settings.inUse,\n    // TODO(sorvell): remove when Polymer does not depend on this\n    'patch': (node) => node,\n    'isShadyRoot': utils.isShadyRoot,\n    'enqueue': enqueue,\n    'flush': flush,\n    'settings': utils.settings,\n    'filterMutations': filterMutations,\n    'observeChildren': observeChildren,\n    'unobserveChildren': unobserveChildren,\n    'nativeMethods': nativeMethods,\n    'nativeTree': nativeTree\n  };\n\n  window['ShadyDOM'] = ShadyDOM;\n\n  // Apply patches to events...\n  patchEvents();\n  // Apply patches to builtins (e.g. Element.prototype) where applicable.\n  patchBuiltins();\n\n  window.ShadowRoot = ShadyRoot;\n}\n","/**\n * @enum {number}\n */\nconst CustomElementState = {\n  custom: 1,\n  failed: 2,\n};\n\nexport default CustomElementState;\n","import * as Utilities from './Utilities.js';\nimport CEState from './CustomElementState.js';\n\nexport default class CustomElementInternals {\n  constructor() {\n    /** @type {!Map<string, !CustomElementDefinition>} */\n    this._localNameToDefinition = new Map();\n\n    /** @type {!Map<!Function, !CustomElementDefinition>} */\n    this._constructorToDefinition = new Map();\n\n    /** @type {!Array<!function(!Node)>} */\n    this._patches = [];\n\n    /** @type {boolean} */\n    this._hasPatches = false;\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!CustomElementDefinition} definition\n   */\n  setDefinition(localName, definition) {\n    this._localNameToDefinition.set(localName, definition);\n    this._constructorToDefinition.set(definition.constructor, definition);\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!CustomElementDefinition|undefined}\n   */\n  localNameToDefinition(localName) {\n    return this._localNameToDefinition.get(localName);\n  }\n\n  /**\n   * @param {!Function} constructor\n   * @return {!CustomElementDefinition|undefined}\n   */\n  constructorToDefinition(constructor) {\n    return this._constructorToDefinition.get(constructor);\n  }\n\n  /**\n   * @param {!function(!Node)} listener\n   */\n  addPatch(listener) {\n    this._hasPatches = true;\n    this._patches.push(listener);\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patchTree(node) {\n    if (!this._hasPatches) return;\n\n    Utilities.walkDeepDescendantElements(node, element => this.patch(element));\n  }\n\n  /**\n   * @param {!Node} node\n   */\n  patch(node) {\n    if (!this._hasPatches) return;\n\n    if (node.__CE_patched) return;\n    node.__CE_patched = true;\n\n    for (let i = 0; i < this._patches.length; i++) {\n      this._patches[i](node);\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  connectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.connectedCallback(element);\n      } else {\n        this.upgradeElement(element);\n      }\n    }\n  }\n\n  /**\n   * @param {!Node} root\n   */\n  disconnectTree(root) {\n    const elements = [];\n\n    Utilities.walkDeepDescendantElements(root, element => elements.push(element));\n\n    for (let i = 0; i < elements.length; i++) {\n      const element = elements[i];\n      if (element.__CE_state === CEState.custom) {\n        this.disconnectedCallback(element);\n      }\n    }\n  }\n\n  /**\n   * Upgrades all uncustomized custom elements at and below a root node for\n   * which there is a definition. When custom element reaction callbacks are\n   * assumed to be called synchronously (which, by the current DOM / HTML spec\n   * definitions, they are *not*), callbacks for both elements customized\n   * synchronously by the parser and elements being upgraded occur in the same\n   * relative order.\n   *\n   * NOTE: This function, when used to simulate the construction of a tree that\n   * is already created but not customized (i.e. by the parser), does *not*\n   * prevent the element from reading the 'final' (true) state of the tree. For\n   * example, the element, during truly synchronous parsing / construction would\n   * see that it contains no children as they have not yet been inserted.\n   * However, this function does not modify the tree, the element will\n   * (incorrectly) have children. Additionally, self-modification restrictions\n   * for custom element constructors imposed by the DOM spec are *not* enforced.\n   *\n   *\n   * The following nested list shows the steps extending down from the HTML\n   * spec's parsing section that cause elements to be synchronously created and\n   * upgraded:\n   *\n   * The \"in body\" insertion mode:\n   * https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody\n   * - Switch on token:\n   *   .. other cases ..\n   *   -> Any other start tag\n   *      - [Insert an HTML element](below) for the token.\n   *\n   * Insert an HTML element:\n   * https://html.spec.whatwg.org/multipage/syntax.html#insert-an-html-element\n   * - Insert a foreign element for the token in the HTML namespace:\n   *   https://html.spec.whatwg.org/multipage/syntax.html#insert-a-foreign-element\n   *   - Create an element for a token:\n   *     https://html.spec.whatwg.org/multipage/syntax.html#create-an-element-for-the-token\n   *     - Will execute script flag is true?\n   *       - (Element queue pushed to the custom element reactions stack.)\n   *     - Create an element:\n   *       https://dom.spec.whatwg.org/#concept-create-element\n   *       - Sync CE flag is true?\n   *         - Constructor called.\n   *         - Self-modification restrictions enforced.\n   *       - Sync CE flag is false?\n   *         - (Upgrade reaction enqueued.)\n   *     - Attributes appended to element.\n   *       (`attributeChangedCallback` reactions enqueued.)\n   *     - Will execute script flag is true?\n   *       - (Element queue popped from the custom element reactions stack.\n   *         Reactions in the popped stack are invoked.)\n   *   - (Element queue pushed to the custom element reactions stack.)\n   *   - Insert the element:\n   *     https://dom.spec.whatwg.org/#concept-node-insert\n   *     - Shadow-including descendants are connected. During parsing\n   *       construction, there are no shadow-*excluding* descendants.\n   *       However, the constructor may have validly attached a shadow\n   *       tree to itself and added descendants to that shadow tree.\n   *       (`connectedCallback` reactions enqueued.)\n   *   - (Element queue popped from the custom element reactions stack.\n   *     Reactions in the popped stack are invoked.)\n   *\n   * @param {!Node} root\n   * @param {{\n   *   visitedImports: (!Set<!Node>|undefined),\n   *   upgrade: (!function(!Element)|undefined),\n   * }=} options\n   */\n  patchAndUpgradeTree(root, options = {}) {\n    const visitedImports = options.visitedImports || new Set();\n    const upgrade = options.upgrade || (element => this.upgradeElement(element));\n\n    const elements = [];\n\n    const gatherElements = element => {\n      if (element.localName === 'link' && element.getAttribute('rel') === 'import') {\n        // The HTML Imports polyfill sets a descendant element of the link to\n        // the `import` property, specifically this is *not* a Document.\n        const importNode = /** @type {?Node} */ (element.import);\n\n        if (importNode instanceof Node) {\n          importNode.__CE_isImportDocument = true;\n          // Connected links are associated with the registry.\n          importNode.__CE_hasRegistry = true;\n        }\n\n        if (importNode && importNode.readyState === 'complete') {\n          importNode.__CE_documentLoadHandled = true;\n        } else {\n          // If this link's import root is not available, its contents can't be\n          // walked. Wait for 'load' and walk it when it's ready.\n          element.addEventListener('load', () => {\n            const importNode = /** @type {!Node} */ (element.import);\n\n            if (importNode.__CE_documentLoadHandled) return;\n            importNode.__CE_documentLoadHandled = true;\n\n            // Clone the `visitedImports` set that was populated sync during\n            // the `patchAndUpgradeTree` call that caused this 'load' handler to\n            // be added. Then, remove *this* link's import node so that we can\n            // walk that import again, even if it was partially walked later\n            // during the same `patchAndUpgradeTree` call.\n            const clonedVisitedImports = new Set(visitedImports);\n            clonedVisitedImports.delete(importNode);\n\n            this.patchAndUpgradeTree(importNode, {visitedImports: clonedVisitedImports, upgrade});\n          });\n        }\n      } else {\n        elements.push(element);\n      }\n    };\n\n    // `walkDeepDescendantElements` populates (and internally checks against)\n    // `visitedImports` when traversing a loaded import.\n    Utilities.walkDeepDescendantElements(root, gatherElements, visitedImports);\n\n    if (this._hasPatches) {\n      for (let i = 0; i < elements.length; i++) {\n        this.patch(elements[i]);\n      }\n    }\n\n    for (let i = 0; i < elements.length; i++) {\n      upgrade(elements[i]);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  upgradeElement(element) {\n    const currentState = element.__CE_state;\n    if (currentState !== undefined) return;\n\n    // Prevent elements created in documents without a browsing context from\n    // upgrading.\n    //\n    // https://html.spec.whatwg.org/multipage/custom-elements.html#look-up-a-custom-element-definition\n    //   \"If document does not have a browsing context, return null.\"\n    //\n    // https://html.spec.whatwg.org/multipage/window-object.html#dom-document-defaultview\n    //   \"The defaultView IDL attribute of the Document interface, on getting,\n    //   must return this Document's browsing context's WindowProxy object, if\n    //   this Document has an associated browsing context, or null otherwise.\"\n    const ownerDocument = element.ownerDocument;\n    if (\n      !ownerDocument.defaultView &&\n      !(ownerDocument.__CE_isImportDocument && ownerDocument.__CE_hasRegistry)\n    ) return;\n\n    const definition = this.localNameToDefinition(element.localName);\n    if (!definition) return;\n\n    definition.constructionStack.push(element);\n\n    const constructor = definition.constructor;\n    try {\n      try {\n        let result = new (constructor)();\n        if (result !== element) {\n          throw new Error('The custom element constructor did not produce the element being upgraded.');\n        }\n      } finally {\n        definition.constructionStack.pop();\n      }\n    } catch (e) {\n      element.__CE_state = CEState.failed;\n      throw e;\n    }\n\n    element.__CE_state = CEState.custom;\n    element.__CE_definition = definition;\n\n    if (definition.attributeChangedCallback) {\n      const observedAttributes = definition.observedAttributes;\n      for (let i = 0; i < observedAttributes.length; i++) {\n        const name = observedAttributes[i];\n        const value = element.getAttribute(name);\n        if (value !== null) {\n          this.attributeChangedCallback(element, name, null, value, null);\n        }\n      }\n    }\n\n    if (Utilities.isConnected(element)) {\n      this.connectedCallback(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  connectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.connectedCallback) {\n      definition.connectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   */\n  disconnectedCallback(element) {\n    const definition = element.__CE_definition;\n    if (definition.disconnectedCallback) {\n      definition.disconnectedCallback.call(element);\n    }\n  }\n\n  /**\n   * @param {!Element} element\n   * @param {string} name\n   * @param {?string} oldValue\n   * @param {?string} newValue\n   * @param {?string} namespace\n   */\n  attributeChangedCallback(element, name, oldValue, newValue, namespace) {\n    const definition = element.__CE_definition;\n    if (\n      definition.attributeChangedCallback &&\n      definition.observedAttributes.indexOf(name) > -1\n    ) {\n      definition.attributeChangedCallback.call(element, name, oldValue, newValue, namespace);\n    }\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\n\nexport default class DocumentConstructionObserver {\n  constructor(internals, doc) {\n    /**\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @type {!Document}\n     */\n    this._document = doc;\n\n    /**\n     * @type {MutationObserver|undefined}\n     */\n    this._observer = undefined;\n\n\n    // Simulate tree construction for all currently accessible nodes in the\n    // document.\n    this._internals.patchAndUpgradeTree(this._document);\n\n    if (this._document.readyState === 'loading') {\n      this._observer = new MutationObserver(this._handleMutations.bind(this));\n\n      // Nodes created by the parser are given to the observer *before* the next\n      // task runs. Inline scripts are run in a new task. This means that the\n      // observer will be able to handle the newly parsed nodes before the inline\n      // script is run.\n      this._observer.observe(this._document, {\n        childList: true,\n        subtree: true,\n      });\n    }\n  }\n\n  disconnect() {\n    if (this._observer) {\n      this._observer.disconnect();\n    }\n  }\n\n  /**\n   * @param {!Array<!MutationRecord>} mutations\n   */\n  _handleMutations(mutations) {\n    // Once the document's `readyState` is 'interactive' or 'complete', all new\n    // nodes created within that document will be the result of script and\n    // should be handled by patching.\n    const readyState = this._document.readyState;\n    if (readyState === 'interactive' || readyState === 'complete') {\n      this.disconnect();\n    }\n\n    for (let i = 0; i < mutations.length; i++) {\n      const addedNodes = mutations[i].addedNodes;\n      for (let j = 0; j < addedNodes.length; j++) {\n        const node = addedNodes[j];\n        this._internals.patchAndUpgradeTree(node);\n      }\n    }\n  }\n}\n","/**\n * @template T\n */\nexport default class Deferred {\n  constructor() {\n    /**\n     * @private\n     * @type {T|undefined}\n     */\n    this._value = undefined;\n\n    /**\n     * @private\n     * @type {Function|undefined}\n     */\n    this._resolve = undefined;\n\n    /**\n     * @private\n     * @type {!Promise<T>}\n     */\n    this._promise = new Promise(resolve => {\n      this._resolve = resolve;\n\n      if (this._value) {\n        resolve(this._value);\n      }\n    });\n  }\n\n  /**\n   * @param {T} value\n   */\n  resolve(value) {\n    if (this._value) {\n      throw new Error('Already resolved.');\n    }\n\n    this._value = value;\n\n    if (this._resolve) {\n      this._resolve(value);\n    }\n  }\n\n  /**\n   * @return {!Promise<T>}\n   */\n  toPromise() {\n    return this._promise;\n  }\n}\n","import CustomElementInternals from './CustomElementInternals.js';\nimport DocumentConstructionObserver from './DocumentConstructionObserver.js';\nimport Deferred from './Deferred.js';\nimport * as Utilities from './Utilities.js';\n\n/**\n * @unrestricted\n */\nexport default class CustomElementRegistry {\n\n  /**\n   * @param {!CustomElementInternals} internals\n   */\n  constructor(internals) {\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._elementDefinitionIsRunning = false;\n\n    /**\n     * @private\n     * @type {!CustomElementInternals}\n     */\n    this._internals = internals;\n\n    /**\n     * @private\n     * @type {!Map<string, !Deferred<undefined>>}\n     */\n    this._whenDefinedDeferred = new Map();\n\n    /**\n     * The default flush callback triggers the document walk synchronously.\n     * @private\n     * @type {!Function}\n     */\n    this._flushCallback = fn => fn();\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this._flushPending = false;\n\n    /**\n     * @private\n     * @type {!Array<!CustomElementDefinition>}\n     */\n    this._pendingDefinitions = [];\n\n    /**\n     * @private\n     * @type {!DocumentConstructionObserver}\n     */\n    this._documentConstructionObserver = new DocumentConstructionObserver(internals, document);\n  }\n\n  /**\n   * @param {string} localName\n   * @param {!Function} constructor\n   */\n  define(localName, constructor) {\n    if (!(constructor instanceof Function)) {\n      throw new TypeError('Custom element constructors must be functions.');\n    }\n\n    if (!Utilities.isValidCustomElementName(localName)) {\n      throw new SyntaxError(`The element name '${localName}' is not valid.`);\n    }\n\n    if (this._internals.localNameToDefinition(localName)) {\n      throw new Error(`A custom element with name '${localName}' has already been defined.`);\n    }\n\n    if (this._elementDefinitionIsRunning) {\n      throw new Error('A custom element is already being defined.');\n    }\n    this._elementDefinitionIsRunning = true;\n\n    let connectedCallback;\n    let disconnectedCallback;\n    let adoptedCallback;\n    let attributeChangedCallback;\n    let observedAttributes;\n    try {\n      /** @type {!Object} */\n      const prototype = constructor.prototype;\n      if (!(prototype instanceof Object)) {\n        throw new TypeError('The custom element constructor\\'s prototype is not an object.');\n      }\n\n      function getCallback(name) {\n        const callbackValue = prototype[name];\n        if (callbackValue !== undefined && !(callbackValue instanceof Function)) {\n          throw new Error(`The '${name}' callback must be a function.`);\n        }\n        return callbackValue;\n      }\n\n      connectedCallback = getCallback('connectedCallback');\n      disconnectedCallback = getCallback('disconnectedCallback');\n      adoptedCallback = getCallback('adoptedCallback');\n      attributeChangedCallback = getCallback('attributeChangedCallback');\n      observedAttributes = constructor['observedAttributes'] || [];\n    } catch (e) {\n      return;\n    } finally {\n      this._elementDefinitionIsRunning = false;\n    }\n\n    const definition = {\n      localName,\n      constructor,\n      connectedCallback,\n      disconnectedCallback,\n      adoptedCallback,\n      attributeChangedCallback,\n      observedAttributes,\n      constructionStack: [],\n    };\n\n    this._internals.setDefinition(localName, definition);\n    this._pendingDefinitions.push(definition);\n\n    // If we've already called the flush callback and it hasn't called back yet,\n    // don't call it again.\n    if (!this._flushPending) {\n      this._flushPending = true;\n      this._flushCallback(() => this._flush());\n    }\n  }\n\n  _flush() {\n    // If no new definitions were defined, don't attempt to flush. This could\n    // happen if a flush callback keeps the function it is given and calls it\n    // multiple times.\n    if (this._flushPending === false) return;\n    this._flushPending = false;\n\n    const pendingDefinitions = this._pendingDefinitions;\n\n    /**\n     * Unupgraded elements with definitions that were defined *before* the last\n     * flush, in document order.\n     * @type {!Array<!Element>}\n     */\n    const elementsWithStableDefinitions = [];\n\n    /**\n     * A map from `localName`s of definitions that were defined *after* the last\n     * flush to unupgraded elements matching that definition, in document order.\n     * @type {!Map<string, !Array<!Element>>}\n     */\n    const elementsWithPendingDefinitions = new Map();\n    for (let i = 0; i < pendingDefinitions.length; i++) {\n      elementsWithPendingDefinitions.set(pendingDefinitions[i].localName, []);\n    }\n\n    this._internals.patchAndUpgradeTree(document, {\n      upgrade: element => {\n        // Ignore the element if it has already upgraded or failed to upgrade.\n        if (element.__CE_state !== undefined) return;\n\n        const localName = element.localName;\n\n        // If there is an applicable pending definition for the element, add the\n        // element to the list of elements to be upgraded with that definition.\n        const pendingElements = elementsWithPendingDefinitions.get(localName);\n        if (pendingElements) {\n          pendingElements.push(element);\n        // If there is *any other* applicable definition for the element, add it\n        // to the list of elements with stable definitions that need to be upgraded.\n        } else if (this._internals.localNameToDefinition(localName)) {\n          elementsWithStableDefinitions.push(element);\n        }\n      },\n    });\n\n    // Upgrade elements with 'stable' definitions first.\n    for (let i = 0; i < elementsWithStableDefinitions.length; i++) {\n      this._internals.upgradeElement(elementsWithStableDefinitions[i]);\n    }\n\n    // Upgrade elements with 'pending' definitions in the order they were defined.\n    while (pendingDefinitions.length > 0) {\n      const definition = pendingDefinitions.shift();\n      const localName = definition.localName;\n\n      // Attempt to upgrade all applicable elements.\n      const pendingUpgradableElements = elementsWithPendingDefinitions.get(definition.localName);\n      for (let i = 0; i < pendingUpgradableElements.length; i++) {\n        this._internals.upgradeElement(pendingUpgradableElements[i]);\n      }\n\n      // Resolve any promises created by `whenDefined` for the definition.\n      const deferred = this._whenDefinedDeferred.get(localName);\n      if (deferred) {\n        deferred.resolve(undefined);\n      }\n    }\n  }\n\n  /**\n   * @param {string} localName\n   * @return {Function|undefined}\n   */\n  get(localName) {\n    const definition = this._internals.localNameToDefinition(localName);\n    if (definition) {\n      return definition.constructor;\n    }\n\n    return undefined;\n  }\n\n  /**\n   * @param {string} localName\n   * @return {!Promise<undefined>}\n   */\n  whenDefined(localName) {\n    if (!Utilities.isValidCustomElementName(localName)) {\n      return Promise.reject(new SyntaxError(`'${localName}' is not a valid custom element name.`));\n    }\n\n    const prior = this._whenDefinedDeferred.get(localName);\n    if (prior) {\n      return prior.toPromise();\n    }\n\n    const deferred = new Deferred();\n    this._whenDefinedDeferred.set(localName, deferred);\n\n    const definition = this._internals.localNameToDefinition(localName);\n    // Resolve immediately only if the given local name has a definition *and*\n    // the full document walk to upgrade elements with that local name has\n    // already happened.\n    if (definition && !this._pendingDefinitions.some(d => d.localName === localName)) {\n      deferred.resolve(undefined);\n    }\n\n    return deferred.toPromise();\n  }\n\n  polyfillWrapFlushCallback(outer) {\n    this._documentConstructionObserver.disconnect();\n    const inner = this._flushCallback;\n    this._flushCallback = flush => outer(() => inner(flush));\n  }\n}\n\n// Closure compiler exports.\nwindow['CustomElementRegistry'] = CustomElementRegistry;\nCustomElementRegistry.prototype['define'] = CustomElementRegistry.prototype.define;\nCustomElementRegistry.prototype['get'] = CustomElementRegistry.prototype.get;\nCustomElementRegistry.prototype['whenDefined'] = CustomElementRegistry.prototype.whenDefined;\nCustomElementRegistry.prototype['polyfillWrapFlushCallback'] = CustomElementRegistry.prototype.polyfillWrapFlushCallback;\n","export default {\n  Document_createElement: window.Document.prototype.createElement,\n  Document_createElementNS: window.Document.prototype.createElementNS,\n  Document_importNode: window.Document.prototype.importNode,\n  Document_prepend: window.Document.prototype['prepend'],\n  Document_append: window.Document.prototype['append'],\n  DocumentFragment_prepend: window.DocumentFragment.prototype['prepend'],\n  DocumentFragment_append: window.DocumentFragment.prototype['append'],\n  Node_cloneNode: window.Node.prototype.cloneNode,\n  Node_appendChild: window.Node.prototype.appendChild,\n  Node_insertBefore: window.Node.prototype.insertBefore,\n  Node_removeChild: window.Node.prototype.removeChild,\n  Node_replaceChild: window.Node.prototype.replaceChild,\n  Node_textContent: Object.getOwnPropertyDescriptor(window.Node.prototype, 'textContent'),\n  Element_attachShadow: window.Element.prototype['attachShadow'],\n  Element_innerHTML: Object.getOwnPropertyDescriptor(window.Element.prototype, 'innerHTML'),\n  Element_getAttribute: window.Element.prototype.getAttribute,\n  Element_setAttribute: window.Element.prototype.setAttribute,\n  Element_removeAttribute: window.Element.prototype.removeAttribute,\n  Element_getAttributeNS: window.Element.prototype.getAttributeNS,\n  Element_setAttributeNS: window.Element.prototype.setAttributeNS,\n  Element_removeAttributeNS: window.Element.prototype.removeAttributeNS,\n  Element_insertAdjacentElement: window.Element.prototype['insertAdjacentElement'],\n  Element_prepend: window.Element.prototype['prepend'],\n  Element_append: window.Element.prototype['append'],\n  Element_before: window.Element.prototype['before'],\n  Element_after: window.Element.prototype['after'],\n  Element_replaceWith: window.Element.prototype['replaceWith'],\n  Element_remove: window.Element.prototype['remove'],\n  HTMLElement: window.HTMLElement,\n  HTMLElement_innerHTML: Object.getOwnPropertyDescriptor(window.HTMLElement.prototype, 'innerHTML'),\n  HTMLElement_insertAdjacentElement: window.HTMLElement.prototype['insertAdjacentElement'],\n};\n","/**\n * This class exists only to work around Closure's lack of a way to describe\n * singletons. It represents the 'already constructed marker' used in custom\n * element construction stacks.\n *\n * https://html.spec.whatwg.org/#concept-already-constructed-marker\n */\nclass AlreadyConstructedMarker {}\n\nexport default new AlreadyConstructedMarker();\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   prepend: !function(...(!Node|string)),\n  *  append: !function(...(!Node|string)),\n * }}\n */\nlet ParentNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ParentNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function appendPrependPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.prepend !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'prepend', appendPrependPatch(builtIn.prepend));\n  }\n\n  if (builtIn.append !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'append', appendPrependPatch(builtIn.append));\n  }\n};\n","import CustomElementInternals from '../../CustomElementInternals.js';\nimport * as Utilities from '../../Utilities.js';\n\n/**\n * @typedef {{\n *   before: !function(...(!Node|string)),\n *   after: !function(...(!Node|string)),\n *   replaceWith: !function(...(!Node|string)),\n *   remove: !function(),\n * }}\n */\nlet ChildNodeNativeMethods;\n\n/**\n * @param {!CustomElementInternals} internals\n * @param {!Object} destination\n * @param {!ChildNodeNativeMethods} builtIn\n */\nexport default function(internals, destination, builtIn) {\n  /**\n   * @param {!function(...(!Node|string))} builtInMethod\n   * @return {!function(...(!Node|string))}\n   */\n  function beforeAfterPatch(builtInMethod) {\n    return function(...nodes) {\n      /**\n       * A copy of `nodes`, with any DocumentFragment replaced by its children.\n       * @type {!Array<!Node>}\n       */\n      const flattenedNodes = [];\n\n      /**\n       * Elements in `nodes` that were connected before this call.\n       * @type {!Array<!Node>}\n       */\n      const connectedElements = [];\n\n      for (var i = 0; i < nodes.length; i++) {\n        const node = nodes[i];\n\n        if (node instanceof Element && Utilities.isConnected(node)) {\n          connectedElements.push(node);\n        }\n\n        if (node instanceof DocumentFragment) {\n          for (let child = node.firstChild; child; child = child.nextSibling) {\n            flattenedNodes.push(child);\n          }\n        } else {\n          flattenedNodes.push(node);\n        }\n      }\n\n      builtInMethod.apply(this, nodes);\n\n      for (let i = 0; i < connectedElements.length; i++) {\n        internals.disconnectTree(connectedElements[i]);\n      }\n\n      if (Utilities.isConnected(this)) {\n        for (let i = 0; i < flattenedNodes.length; i++) {\n          const node = flattenedNodes[i];\n          if (node instanceof Element) {\n            internals.connectTree(node);\n          }\n        }\n      }\n    };\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'before', beforeAfterPatch(builtIn.before));\n  }\n\n  if (builtIn.before !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'after', beforeAfterPatch(builtIn.after));\n  }\n\n  if (builtIn.replaceWith !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'replaceWith',\n      /**\n       * @param {...(!Node|string)} nodes\n       */\n      function(...nodes) {\n        /**\n         * A copy of `nodes`, with any DocumentFragment replaced by its children.\n         * @type {!Array<!Node>}\n         */\n        const flattenedNodes = [];\n\n        /**\n         * Elements in `nodes` that were connected before this call.\n         * @type {!Array<!Node>}\n         */\n        const connectedElements = [];\n\n        for (var i = 0; i < nodes.length; i++) {\n          const node = nodes[i];\n\n          if (node instanceof Element && Utilities.isConnected(node)) {\n            connectedElements.push(node);\n          }\n\n          if (node instanceof DocumentFragment) {\n            for (let child = node.firstChild; child; child = child.nextSibling) {\n              flattenedNodes.push(child);\n            }\n          } else {\n            flattenedNodes.push(node);\n          }\n        }\n\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.replaceWith.apply(this, nodes);\n\n        for (let i = 0; i < connectedElements.length; i++) {\n          internals.disconnectTree(connectedElements[i]);\n        }\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n          for (let i = 0; i < flattenedNodes.length; i++) {\n            const node = flattenedNodes[i];\n            if (node instanceof Element) {\n              internals.connectTree(node);\n            }\n          }\n        }\n      });\n    }\n\n  if (builtIn.remove !== undefined) {\n    Utilities.setPropertyUnchecked(destination, 'remove',\n      function() {\n        const wasConnected = Utilities.isConnected(this);\n\n        builtIn.remove.call(this);\n\n        if (wasConnected) {\n          internals.disconnectTree(this);\n        }\n      });\n  }\n};\n","/**\n * @license\n * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\nimport CustomElementInternals from './CustomElementInternals.js';\nimport CustomElementRegistry from './CustomElementRegistry.js';\n\nimport PatchHTMLElement from './Patch/HTMLElement.js';\nimport PatchDocument from './Patch/Document.js';\nimport PatchDocumentFragment from './Patch/DocumentFragment.js';\nimport PatchNode from './Patch/Node.js';\nimport PatchElement from './Patch/Element.js';\n\nconst priorCustomElements = window['customElements'];\n\nif (!priorCustomElements ||\n     priorCustomElements['forcePolyfill'] ||\n     (typeof priorCustomElements['define'] != 'function') ||\n     (typeof priorCustomElements['get'] != 'function')) {\n  /** @type {!CustomElementInternals} */\n  const internals = new CustomElementInternals();\n\n  PatchHTMLElement(internals);\n  PatchDocument(internals);\n  PatchDocumentFragment(internals);\n  PatchNode(internals);\n  PatchElement(internals);\n\n  // The main document is always associated with the registry.\n  document.__CE_hasRegistry = true;\n\n  /** @type {!CustomElementRegistry} */\n  const customElements = new CustomElementRegistry(internals);\n\n  Object.defineProperty(window, 'customElements', {\n    configurable: true,\n    enumerable: true,\n    value: customElements,\n  });\n}\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport AlreadyConstructedMarker from '../AlreadyConstructedMarker.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  window['HTMLElement'] = (function() {\n    /**\n     * @type {function(new: HTMLElement): !HTMLElement}\n     */\n    function HTMLElement() {\n      // This should really be `new.target` but `new.target` can't be emulated\n      // in ES5. Assuming the user keeps the default value of the constructor's\n      // prototype's `constructor` property, this is equivalent.\n      /** @type {!Function} */\n      const constructor = this.constructor;\n\n      const definition = internals.constructorToDefinition(constructor);\n      if (!definition) {\n        throw new Error('The custom element being constructed was not registered with `customElements`.');\n      }\n\n      const constructionStack = definition.constructionStack;\n\n      if (constructionStack.length === 0) {\n        const element = Native.Document_createElement.call(document, definition.localName);\n        Object.setPrototypeOf(element, constructor.prototype);\n        element.__CE_state = CEState.custom;\n        element.__CE_definition = definition;\n        internals.patch(element);\n        return element;\n      }\n\n      const lastIndex = constructionStack.length - 1;\n      const element = constructionStack[lastIndex];\n      if (element === AlreadyConstructedMarker) {\n        throw new Error('The HTMLElement constructor was either called reentrantly for this constructor or called multiple times.');\n      }\n      constructionStack[lastIndex] = AlreadyConstructedMarker;\n\n      Object.setPrototypeOf(element, constructor.prototype);\n      internals.patch(/** @type {!HTMLElement} */ (element));\n\n      return element;\n    }\n\n    HTMLElement.prototype = Native.HTMLElement.prototype;\n\n    return HTMLElement;\n  })();\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElement',\n    /**\n     * @this {Document}\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElement.call(this, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'importNode',\n    /**\n     * @this {Document}\n     * @param {!Node} node\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(node, deep) {\n      const clone = Native.Document_importNode.call(this, node, deep);\n      // Only create custom elements if this document is associated with the registry.\n      if (!this.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  const NS_HTML = \"http://www.w3.org/1999/xhtml\";\n\n  Utilities.setPropertyUnchecked(Document.prototype, 'createElementNS',\n    /**\n     * @this {Document}\n     * @param {?string} namespace\n     * @param {string} localName\n     * @return {!Element}\n     */\n    function(namespace, localName) {\n      // Only create custom elements if this document is associated with the registry.\n      if (this.__CE_hasRegistry && (namespace === null || namespace === NS_HTML)) {\n        const definition = internals.localNameToDefinition(localName);\n        if (definition) {\n          return new (definition.constructor)();\n        }\n      }\n\n      const result = /** @type {!Element} */\n        (Native.Document_createElementNS.call(this, namespace, localName));\n      internals.patch(result);\n      return result;\n    });\n\n  PatchParentNode(internals, Document.prototype, {\n    prepend: Native.Document_prepend,\n    append: Native.Document_append,\n  });\n};\n","import CustomElementInternals from '../CustomElementInternals.js';\nimport Native from './Native.js';\nimport PatchParentNode from './Interface/ParentNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  PatchParentNode(internals, DocumentFragment.prototype, {\n    prepend: Native.DocumentFragment_prepend,\n    append: Native.DocumentFragment_append,\n  });\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport * as Utilities from '../Utilities.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  // `Node#nodeValue` is implemented on `Attr`.\n  // `Node#textContent` is implemented on `Attr`, `Element`.\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'insertBefore',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @param {?Node} refNode\n     * @return {!Node}\n     */\n    function(node, refNode) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_insertBefore.call(this, node, refNode);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'appendChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      if (node instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(node.childNodes);\n        const nativeResult = Native.Node_appendChild.call(this, node);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_appendChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      if (Utilities.isConnected(this)) {\n        internals.connectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'cloneNode',\n    /**\n     * @this {Node}\n     * @param {boolean=} deep\n     * @return {!Node}\n     */\n    function(deep) {\n      const clone = Native.Node_cloneNode.call(this, deep);\n      // Only create custom elements if this element's owner document is\n      // associated with the registry.\n      if (!this.ownerDocument.__CE_hasRegistry) {\n        internals.patchTree(clone);\n      } else {\n        internals.patchAndUpgradeTree(clone);\n      }\n      return clone;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'removeChild',\n    /**\n     * @this {Node}\n     * @param {!Node} node\n     * @return {!Node}\n     */\n    function(node) {\n      const nodeWasConnected = Utilities.isConnected(node);\n      const nativeResult = Native.Node_removeChild.call(this, node);\n\n      if (nodeWasConnected) {\n        internals.disconnectTree(node);\n      }\n\n      return nativeResult;\n    });\n\n  Utilities.setPropertyUnchecked(Node.prototype, 'replaceChild',\n    /**\n     * @this {Node}\n     * @param {!Node} nodeToInsert\n     * @param {!Node} nodeToRemove\n     * @return {!Node}\n     */\n    function(nodeToInsert, nodeToRemove) {\n      if (nodeToInsert instanceof DocumentFragment) {\n        const insertedNodes = Array.prototype.slice.apply(nodeToInsert.childNodes);\n        const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n\n        // DocumentFragments can't be connected, so `disconnectTree` will never\n        // need to be called on a DocumentFragment's children after inserting it.\n\n        if (Utilities.isConnected(this)) {\n          internals.disconnectTree(nodeToRemove);\n          for (let i = 0; i < insertedNodes.length; i++) {\n            internals.connectTree(insertedNodes[i]);\n          }\n        }\n\n        return nativeResult;\n      }\n\n      const nodeToInsertWasConnected = Utilities.isConnected(nodeToInsert);\n      const nativeResult = Native.Node_replaceChild.call(this, nodeToInsert, nodeToRemove);\n      const thisIsConnected = Utilities.isConnected(this);\n\n      if (thisIsConnected) {\n        internals.disconnectTree(nodeToRemove);\n      }\n\n      if (nodeToInsertWasConnected) {\n        internals.disconnectTree(nodeToInsert);\n      }\n\n      if (thisIsConnected) {\n        internals.connectTree(nodeToInsert);\n      }\n\n      return nativeResult;\n    });\n\n\n  function patch_textContent(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'textContent', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Node} */ function(assignedValue) {\n        // If this is a text node then there are no nodes to disconnect.\n        if (this.nodeType === Node.TEXT_NODE) {\n          baseDescriptor.set.call(this, assignedValue);\n          return;\n        }\n\n        let removedNodes = undefined;\n        // Checking for `firstChild` is faster than reading `childNodes.length`\n        // to compare with 0.\n        if (this.firstChild) {\n          // Using `childNodes` is faster than `children`, even though we only\n          // care about elements.\n          const childNodes = this.childNodes;\n          const childNodesLength = childNodes.length;\n          if (childNodesLength > 0 && Utilities.isConnected(this)) {\n            // Copying an array by iterating is faster than using slice.\n            removedNodes = new Array(childNodesLength);\n            for (let i = 0; i < childNodesLength; i++) {\n              removedNodes[i] = childNodes[i];\n            }\n          }\n        }\n\n        baseDescriptor.set.call(this, assignedValue);\n\n        if (removedNodes) {\n          for (let i = 0; i < removedNodes.length; i++) {\n            internals.disconnectTree(removedNodes[i]);\n          }\n        }\n      },\n    });\n  }\n\n  if (Native.Node_textContent && Native.Node_textContent.get) {\n    patch_textContent(Node.prototype, Native.Node_textContent);\n  } else {\n    internals.addPatch(function(element) {\n      patch_textContent(element, {\n        enumerable: true,\n        configurable: true,\n        // NOTE: This implementation of the `textContent` getter assumes that\n        // text nodes' `textContent` getter will not be patched.\n        get: /** @this {Node} */ function() {\n          /** @type {!Array<string>} */\n          const parts = [];\n\n          for (let i = 0; i < this.childNodes.length; i++) {\n            parts.push(this.childNodes[i].textContent);\n          }\n\n          return parts.join('');\n        },\n        set: /** @this {Node} */ function(assignedValue) {\n          while (this.firstChild) {\n            Native.Node_removeChild.call(this, this.firstChild);\n          }\n          Native.Node_appendChild.call(this, document.createTextNode(assignedValue));\n        },\n      });\n    });\n  }\n};\n","import Native from './Native.js';\nimport CustomElementInternals from '../CustomElementInternals.js';\nimport CEState from '../CustomElementState.js';\nimport * as Utilities from '../Utilities.js';\n\nimport PatchParentNode from './Interface/ParentNode.js';\nimport PatchChildNode from './Interface/ChildNode.js';\n\n/**\n * @param {!CustomElementInternals} internals\n */\nexport default function(internals) {\n  if (Native.Element_attachShadow) {\n    Utilities.setPropertyUnchecked(Element.prototype, 'attachShadow',\n      /**\n       * @this {Element}\n       * @param {!{mode: string}} init\n       * @return {ShadowRoot}\n       */\n      function(init) {\n        const shadowRoot = Native.Element_attachShadow.call(this, init);\n        this.__CE_shadowRoot = shadowRoot;\n        return shadowRoot;\n      });\n  }\n\n\n  function patch_innerHTML(destination, baseDescriptor) {\n    Object.defineProperty(destination, 'innerHTML', {\n      enumerable: baseDescriptor.enumerable,\n      configurable: true,\n      get: baseDescriptor.get,\n      set: /** @this {Element} */ function(htmlString) {\n        const isConnected = Utilities.isConnected(this);\n\n        // NOTE: In IE11, when using the native `innerHTML` setter, all nodes\n        // that were previously descendants of the context element have all of\n        // their children removed as part of the set - the entire subtree is\n        // 'disassembled'. This work around walks the subtree *before* using the\n        // native setter.\n        /** @type {!Array<!Element>|undefined} */\n        let removedElements = undefined;\n        if (isConnected) {\n          removedElements = [];\n          Utilities.walkDeepDescendantElements(this, element => {\n            if (element !== this) {\n              removedElements.push(element);\n            }\n          });\n        }\n\n        baseDescriptor.set.call(this, htmlString);\n\n        if (removedElements) {\n          for (let i = 0; i < removedElements.length; i++) {\n            const element = removedElements[i];\n            if (element.__CE_state === CEState.custom) {\n              internals.disconnectedCallback(element);\n            }\n          }\n        }\n\n        // Only create custom elements if this element's owner document is\n        // associated with the registry.\n        if (!this.ownerDocument.__CE_hasRegistry) {\n          internals.patchTree(this);\n        } else {\n          internals.patchAndUpgradeTree(this);\n        }\n        return htmlString;\n      },\n    });\n  }\n\n  if (Native.Element_innerHTML && Native.Element_innerHTML.get) {\n    patch_innerHTML(Element.prototype, Native.Element_innerHTML);\n  } else if (Native.HTMLElement_innerHTML && Native.HTMLElement_innerHTML.get) {\n    patch_innerHTML(HTMLElement.prototype, Native.HTMLElement_innerHTML);\n  } else {\n\n    internals.addPatch(function(element) {\n      patch_innerHTML(element, {\n        enumerable: true,\n        configurable: true,\n        // Implements getting `innerHTML` by performing an unpatched `cloneNode`\n        // of the element and returning the resulting element's `innerHTML`.\n        // TODO: Is this too expensive?\n        get: /** @this {Element} */ function() {\n          return Native.Node_cloneNode.call(this, true).innerHTML;\n        },\n        // Implements setting `innerHTML` by creating an unpatched element,\n        // setting `innerHTML` of that element and replacing the target\n        // element's children with those of the unpatched element.\n        set: /** @this {Element} */ function(assignedValue) {\n          // NOTE: re-route to `content` for `template` elements.\n          // We need to do this because `template.appendChild` does not\n          // route into `template.content`.\n          const isTemplate = (this.localName === 'template');\n          /** @type {!Node} */\n          const content = isTemplate ? (/** @type {!HTMLTemplateElement} */\n            (this)).content : this;\n          /** @type {!Node} */\n          const rawElement = Native.Document_createElement.call(document,\n            this.localName);\n          rawElement.innerHTML = assignedValue;\n\n          while (content.childNodes.length > 0) {\n            Native.Node_removeChild.call(content, content.childNodes[0]);\n          }\n          const container = isTemplate ? rawElement.content : rawElement;\n          while (container.childNodes.length > 0) {\n            Native.Node_appendChild.call(content, container.childNodes[0]);\n          }\n        },\n      });\n    });\n  }\n\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttribute.call(this, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_setAttribute.call(this, name, newValue);\n      newValue = Native.Element_getAttribute.call(this, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, null);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'setAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     * @param {string} newValue\n     */\n    function(namespace, name, newValue) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_setAttributeNS.call(this, namespace, name, newValue);\n      newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttribute',\n    /**\n     * @this {Element}\n     * @param {string} name\n     */\n    function(name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttribute.call(this, name);\n      }\n\n      const oldValue = Native.Element_getAttribute.call(this, name);\n      Native.Element_removeAttribute.call(this, name);\n      if (oldValue !== null) {\n        internals.attributeChangedCallback(this, name, oldValue, null, null);\n      }\n    });\n\n  Utilities.setPropertyUnchecked(Element.prototype, 'removeAttributeNS',\n    /**\n     * @this {Element}\n     * @param {?string} namespace\n     * @param {string} name\n     */\n    function(namespace, name) {\n      // Fast path for non-custom elements.\n      if (this.__CE_state !== CEState.custom) {\n        return Native.Element_removeAttributeNS.call(this, namespace, name);\n      }\n\n      const oldValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      Native.Element_removeAttributeNS.call(this, namespace, name);\n      // In older browsers, `Element#getAttributeNS` may return the empty string\n      // instead of null if the attribute does not exist. For details, see;\n      // https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes\n      const newValue = Native.Element_getAttributeNS.call(this, namespace, name);\n      if (oldValue !== newValue) {\n        internals.attributeChangedCallback(this, name, oldValue, newValue, namespace);\n      }\n    });\n\n\n  function patch_insertAdjacentElement(destination, baseMethod) {\n    Utilities.setPropertyUnchecked(destination, 'insertAdjacentElement',\n      /**\n       * @this {Element}\n       * @param {string} where\n       * @param {!Element} element\n       * @return {?Element}\n       */\n      function(where, element) {\n        const wasConnected = Utilities.isConnected(element);\n        const insertedElement = /** @type {!Element} */\n          (baseMethod.call(this, where, element));\n\n        if (wasConnected) {\n          internals.disconnectTree(element);\n        }\n\n        if (Utilities.isConnected(insertedElement)) {\n          internals.connectTree(element);\n        }\n        return insertedElement;\n      });\n  }\n\n  if (Native.HTMLElement_insertAdjacentElement) {\n    patch_insertAdjacentElement(HTMLElement.prototype, Native.HTMLElement_insertAdjacentElement);\n  } else if (Native.Element_insertAdjacentElement) {\n    patch_insertAdjacentElement(Element.prototype, Native.Element_insertAdjacentElement);\n  } else {\n    console.warn('Custom Elements: `Element#insertAdjacentElement` was not patched.');\n  }\n\n\n  PatchParentNode(internals, Element.prototype, {\n    prepend: Native.Element_prepend,\n    append: Native.Element_append,\n  });\n\n  PatchChildNode(internals, Element.prototype, {\n    before: Native.Element_before,\n    after: Native.Element_after,\n    replaceWith: Native.Element_replaceWith,\n    remove: Native.Element_remove,\n  });\n};\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport const VAR_ASSIGN = /(?:^|[;\\s{]\\s*)(--[\\w-]*?)\\s*:\\s*(?:((?:'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\([^)]*?\\)|[^};{])+)|\\{([^}]*)\\}(?:(?=[;\\s}])|$))/gi;\nexport const MIXIN_MATCH = /(?:^|\\W+)@apply\\s*\\(?([^);\\n]*)\\)?/gi;\nexport const VAR_CONSUMED = /(--[\\w-]+)\\s*([:,;)]|$)/gi;\nexport const ANIMATION_MATCH = /(animation\\s*:)|(animation-name\\s*:)/;\nexport const MEDIA_MATCH = /@media\\s(.*)/;\nexport const IS_VAR = /^--/;\nexport const BRACKETED = /\\{[^}]*\\}/g;\nexport const HOST_PREFIX = '(?:^|[^.#[:])';\nexport const HOST_SUFFIX = '($|[.:[\\\\s>+~])';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport * as StyleUtil from './style-util.js';\nimport {nativeShadow} from './style-settings.js';\n\n/* Transforms ShadowDOM styling into ShadyDOM styling\n\n* scoping:\n\n  * elements in scope get scoping selector class=\"x-foo-scope\"\n  * selectors re-written as follows:\n\n    div button -> div.x-foo-scope button.x-foo-scope\n\n* :host -> scopeName\n\n* :host(...) -> scopeName...\n\n* ::slotted(...) -> scopeName > ...\n\n* ...:dir(ltr|rtl) -> [dir=\"ltr|rtl\"] ..., ...[dir=\"ltr|rtl\"]\n\n* :host(:dir[rtl]) -> scopeName:dir(rtl) -> [dir=\"rtl\"] scopeName, scopeName[dir=\"rtl\"]\n\n*/\nconst SCOPE_NAME = 'style-scope';\n\nclass StyleTransformer {\n  get SCOPE_NAME() {\n    return SCOPE_NAME;\n  }\n  // Given a node and scope name, add a scoping class to each node\n  // in the tree. This facilitates transforming css into scoped rules.\n  dom(node, scope, shouldRemoveScope) {\n    // one time optimization to skip scoping...\n    if (node['__styleScoped']) {\n      node['__styleScoped'] = null;\n    } else {\n      this._transformDom(node, scope || '', shouldRemoveScope);\n    }\n  }\n\n  _transformDom(node, selector, shouldRemoveScope) {\n    if (node.nodeType === Node.ELEMENT_NODE) {\n      this.element(node, selector, shouldRemoveScope);\n    }\n    let c$ = (node.localName === 'template') ?\n      (node.content || node._content).childNodes :\n      node.children || node.childNodes;\n    if (c$) {\n      for (let i=0; i<c$.length; i++) {\n        this._transformDom(c$[i], selector, shouldRemoveScope);\n      }\n    }\n  }\n\n  element(element, scope, shouldRemoveScope) {\n    // note: if using classes, we add both the general 'style-scope' class\n    // as well as the specific scope. This enables easy filtering of all\n    // `style-scope` elements\n    if (scope) {\n      // note: svg on IE does not have classList so fallback to class\n      if (element.classList) {\n        if (shouldRemoveScope) {\n          element.classList.remove(SCOPE_NAME);\n          element.classList.remove(scope);\n        } else {\n          element.classList.add(SCOPE_NAME);\n          element.classList.add(scope);\n        }\n      } else if (element.getAttribute) {\n        let c = element.getAttribute(CLASS);\n        if (shouldRemoveScope) {\n          if (c) {\n            let newValue = c.replace(SCOPE_NAME, '').replace(scope, '');\n            StyleUtil.setElementClassRaw(element, newValue);\n          }\n        } else {\n          let newValue = (c ? c + ' ' : '') + SCOPE_NAME + ' ' + scope;\n          StyleUtil.setElementClassRaw(element, newValue);\n        }\n      }\n    }\n  }\n\n  elementStyles(element, styleRules, callback) {\n    let cssBuildType = element['__cssBuild'];\n    // no need to shim selectors if settings.useNativeShadow, also\n    // a shady css build will already have transformed selectors\n    // NOTE: This method may be called as part of static or property shimming.\n    // When there is a targeted build it will not be called for static shimming,\n    // but when the property shim is used it is called and should opt out of\n    // static shimming work when a proper build exists.\n    let cssText = '';\n    if (nativeShadow || cssBuildType === 'shady') {\n      cssText = StyleUtil.toCssText(styleRules, callback);\n    } else {\n      let {is, typeExtension} = StyleUtil.getIsExtends(element);\n      cssText = this.css(styleRules, is, typeExtension, callback) + '\\n\\n';\n    }\n    return cssText.trim();\n  }\n\n  // Given a string of cssText and a scoping string (scope), returns\n  // a string of scoped css where each selector is transformed to include\n  // a class created from the scope. ShadowDOM selectors are also transformed\n  // (e.g. :host) to use the scoping selector.\n  css(rules, scope, ext, callback) {\n    let hostScope = this._calcHostScope(scope, ext);\n    scope = this._calcElementScope(scope);\n    let self = this;\n    return StyleUtil.toCssText(rules, function(/** StyleNode */rule) {\n      if (!rule.isScoped) {\n        self.rule(rule, scope, hostScope);\n        rule.isScoped = true;\n      }\n      if (callback) {\n        callback(rule, scope, hostScope);\n      }\n    });\n  }\n\n  _calcElementScope(scope) {\n    if (scope) {\n      return CSS_CLASS_PREFIX + scope;\n    } else {\n      return '';\n    }\n  }\n\n  _calcHostScope(scope, ext) {\n    return ext ? `[is=${scope}]` : scope;\n  }\n\n  rule(rule, scope, hostScope) {\n    this._transformRule(rule, this._transformComplexSelector,\n      scope, hostScope);\n  }\n\n  /**\n   * transforms a css rule to a scoped rule.\n   *\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRule(rule, transformer, scope, hostScope) {\n    // NOTE: save transformedSelector for subsequent matching of elements\n    // against selectors (e.g. when calculating style properties)\n    rule['selector'] = rule.transformedSelector =\n      this._transformRuleCss(rule, transformer, scope, hostScope);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   * @param {Function} transformer\n   * @param {string=} scope\n   * @param {string=} hostScope\n   */\n  _transformRuleCss(rule, transformer, scope, hostScope) {\n    let p$ = rule['selector'].split(COMPLEX_SELECTOR_SEP);\n    // we want to skip transformation of rules that appear in keyframes,\n    // because they are keyframe selectors, not element selectors.\n    if (!StyleUtil.isKeyframesSelector(rule)) {\n      for (let i=0, l=p$.length, p; (i<l) && (p=p$[i]); i++) {\n        p$[i] = transformer.call(this, p, scope, hostScope);\n      }\n    }\n    return p$.join(COMPLEX_SELECTOR_SEP);\n  }\n\n  /**\n   * @param {string} selector\n   * @return {string}\n   */\n  _twiddleNthPlus(selector) {\n    return selector.replace(NTH, (m, type, inside) => {\n      if (inside.indexOf('+') > -1) {\n        inside = inside.replace(/\\+/g, '___');\n      } else if (inside.indexOf('___') > -1) {\n        inside = inside.replace(/___/g, '+');\n      }\n      return `:${type}(${inside})`;\n    });\n  }\n\n/**\n * @param {string} selector\n * @param {string} scope\n * @param {string=} hostScope\n */\n  _transformComplexSelector(selector, scope, hostScope) {\n    let stop = false;\n    selector = selector.trim();\n    // Remove spaces inside of selectors like `:nth-of-type` because it confuses SIMPLE_SELECTOR_SEP\n    let isNth = NTH.test(selector);\n    if (isNth) {\n      selector = selector.replace(NTH, (m, type, inner) => `:${type}(${inner.replace(/\\s/g, '')})`)\n      selector = this._twiddleNthPlus(selector);\n    }\n    selector = selector.replace(SLOTTED_START, `${HOST} $1`);\n    selector = selector.replace(SIMPLE_SELECTOR_SEP, (m, c, s) => {\n      if (!stop) {\n        let info = this._transformCompoundSelector(s, c, scope, hostScope);\n        stop = stop || info.stop;\n        c = info.combinator;\n        s = info.value;\n      }\n      return c + s;\n    });\n    if (isNth) {\n      selector = this._twiddleNthPlus(selector);\n    }\n    return selector;\n  }\n\n  _transformCompoundSelector(selector, combinator, scope, hostScope) {\n    // replace :host with host scoping class\n    let slottedIndex = selector.indexOf(SLOTTED);\n    if (selector.indexOf(HOST) >= 0) {\n      selector = this._transformHostSelector(selector, hostScope);\n    // replace other selectors with scoping class\n    } else if (slottedIndex !== 0) {\n      selector = scope ? this._transformSimpleSelector(selector, scope) :\n        selector;\n    }\n    // mark ::slotted() scope jump to replace with descendant selector + arg\n    // also ignore left-side combinator\n    let slotted = false;\n    if (slottedIndex >= 0) {\n      combinator = '';\n      slotted = true;\n    }\n    // process scope jumping selectors up to the scope jump and then stop\n    let stop;\n    if (slotted) {\n      stop = true;\n      if (slotted) {\n        // .zonk ::slotted(.foo) -> .zonk.scope > .foo\n        selector = selector.replace(SLOTTED_PAREN, (m, paren) => ` > ${paren}`);\n      }\n    }\n    selector = selector.replace(DIR_PAREN, (m, before, dir) =>\n      `[dir=\"${dir}\"] ${before}, ${before}[dir=\"${dir}\"]`);\n    return {value: selector, combinator, stop};\n  }\n\n  _transformSimpleSelector(selector, scope) {\n    let p$ = selector.split(PSEUDO_PREFIX);\n    p$[0] += scope;\n    return p$.join(PSEUDO_PREFIX);\n  }\n\n  // :host(...) -> scopeName...\n  _transformHostSelector(selector, hostScope) {\n    let m = selector.match(HOST_PAREN);\n    let paren = m && m[2].trim() || '';\n    if (paren) {\n      if (!paren[0].match(SIMPLE_SELECTOR_PREFIX)) {\n        // paren starts with a type selector\n        let typeSelector = paren.split(SIMPLE_SELECTOR_PREFIX)[0];\n        // if the type selector is our hostScope then avoid pre-pending it\n        if (typeSelector === hostScope) {\n          return paren;\n        // otherwise, this selector should not match in this scope so\n        // output a bogus selector.\n        } else {\n          return SELECTOR_NO_MATCH;\n        }\n      } else {\n        // make sure to do a replace here to catch selectors like:\n        // `:host(.foo)::before`\n        return selector.replace(HOST_PAREN, function(m, host, paren) {\n          return hostScope + paren;\n        });\n      }\n    // if no paren, do a straight :host replacement.\n    // TODO(sorvell): this should not strictly be necessary but\n    // it's needed to maintain support for `:host[foo]` type selectors\n    // which have been improperly used under Shady DOM. This should be\n    // deprecated.\n    } else {\n      return selector.replace(HOST, hostScope);\n    }\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  documentRule(rule) {\n    // reset selector in case this is redone.\n    rule['selector'] = rule['parsedSelector'];\n    this.normalizeRootSelector(rule);\n    this._transformRule(rule, this._transformDocumentSelector);\n  }\n\n  /**\n   * @param {StyleNode} rule\n   */\n  normalizeRootSelector(rule) {\n    if (rule['selector'] === ROOT) {\n      rule['selector'] = 'html';\n    }\n  }\n\n/**\n * @param {string} selector\n */\n  _transformDocumentSelector(selector) {\n    return selector.match(SLOTTED) ?\n      this._transformComplexSelector(selector, SCOPE_DOC_SELECTOR) :\n      this._transformSimpleSelector(selector.trim(), SCOPE_DOC_SELECTOR);\n  }\n}\n\nlet NTH = /:(nth[-\\w]+)\\(([^)]+)\\)/;\nlet SCOPE_DOC_SELECTOR = `:not(.${SCOPE_NAME})`;\nlet COMPLEX_SELECTOR_SEP = ',';\nlet SIMPLE_SELECTOR_SEP = /(^|[\\s>+~]+)((?:\\[.+?\\]|[^\\s>+~=[])+)/g;\nlet SIMPLE_SELECTOR_PREFIX = /[[.:#*]/;\nlet HOST = ':host';\nlet ROOT = ':root';\nlet SLOTTED = '::slotted';\nlet SLOTTED_START = new RegExp(`^(${SLOTTED})`);\n// NOTE: this supports 1 nested () pair for things like\n// :host(:not([selected]), more general support requires\n// parsing which seems like overkill\nlet HOST_PAREN = /(:host)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\n// similar to HOST_PAREN\nlet SLOTTED_PAREN = /(?:::slotted)(?:\\(((?:\\([^)(]*\\)|[^)(]*)+?)\\))/;\nlet DIR_PAREN = /(.*):dir\\((?:(ltr|rtl))\\)/;\nlet CSS_CLASS_PREFIX = '.';\nlet PSEUDO_PREFIX = ':';\nlet CLASS = 'class';\nlet SELECTOR_NO_MATCH = 'should_not_match';\n\nexport default new StyleTransformer()","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\n/** @const {string} */\nconst infoKey = '__styleInfo';\n\nexport default class StyleInfo {\n  /**\n   * @param {Element} node\n   * @return {StyleInfo}\n   */\n  static get(node) {\n    if (node) {\n      return node[infoKey];\n    } else {\n      return null;\n    }\n  }\n  /**\n   * @param {!Element} node\n   * @param {StyleInfo} styleInfo\n   * @return {StyleInfo}\n   */\n  static set(node, styleInfo) {\n    node[infoKey] = styleInfo;\n    return styleInfo;\n  }\n  /**\n   * @param {StyleNode} ast\n   * @param {Node=} placeholder\n   * @param {Array<string>=} ownStylePropertyNames\n   * @param {string=} elementName\n   * @param {string=} typeExtension\n   * @param {string=} cssBuild\n   */\n  constructor(ast, placeholder, ownStylePropertyNames, elementName, typeExtension, cssBuild) {\n    /** @type {StyleNode} */\n    this.styleRules = ast || null;\n    /** @type {Node} */\n    this.placeholder = placeholder || null;\n    /** @type {!Array<string>} */\n    this.ownStylePropertyNames = ownStylePropertyNames || [];\n    /** @type {Array<Object>} */\n    this.overrideStyleProperties = null;\n    /** @type {string} */\n    this.elementName = elementName || '';\n    /** @type {string} */\n    this.cssBuild = cssBuild || '';\n    /** @type {string} */\n    this.typeExtension = typeExtension || '';\n    /** @type {Object<string, string>} */\n    this.styleProperties = null;\n    /** @type {?string} */\n    this.scopeSelector = null;\n    /** @type {HTMLStyleElement} */\n    this.customStyle = null;\n  }\n  _getStyleRules() {\n    return this.styleRules;\n  }\n}\n\nStyleInfo.prototype['_getStyleRules'] = StyleInfo.prototype._getStyleRules;","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {applyStylePlaceHolder} from './style-util.js';\nimport {nativeShadow} from './style-settings.js';\n\n/** @type {Object<string, !Node>} */\nlet placeholderMap = {};\n\n/**\n * @const {CustomElementRegistry}\n */\nconst ce = window['customElements'];\nif (ce && !nativeShadow) {\n  /**\n   * @const {function(this:CustomElementRegistry, string,function(new:HTMLElement),{extends: string}=)}\n   */\n  const origDefine = ce['define'];\n  /**\n   * @param {string} name\n   * @param {function(new:HTMLElement)} clazz\n   * @param {{extends: string}=} options\n   * @return {function(new:HTMLElement)}\n   */\n  const wrappedDefine = (name, clazz, options) => {\n    placeholderMap[name] = applyStylePlaceHolder(name);\n    return origDefine.call(/** @type {!CustomElementRegistry} */(ce), name, clazz, options);\n  }\n  ce['define'] = wrappedDefine;\n}\n\nexport default placeholderMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n'use strict';\n\nexport default class StyleCache {\n  constructor(typeMax = 100) {\n    // map element name -> [{properties, styleElement, scopeSelector}]\n    this.cache = {};\n    this.typeMax = typeMax;\n  }\n\n  _validate(cacheEntry, properties, ownPropertyNames) {\n    for (let idx = 0; idx < ownPropertyNames.length; idx++) {\n      let pn = ownPropertyNames[idx];\n      if (cacheEntry.properties[pn] !== properties[pn]) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  store(tagname, properties, styleElement, scopeSelector) {\n    let list = this.cache[tagname] || [];\n    list.push({properties, styleElement, scopeSelector});\n    if (list.length > this.typeMax) {\n      list.shift();\n    }\n    this.cache[tagname] = list;\n  }\n\n  fetch(tagname, properties, ownPropertyNames) {\n    let list = this.cache[tagname];\n    if (!list) {\n      return;\n    }\n    // reverse list for most-recent lookups\n    for (let idx = list.length - 1; idx >= 0; idx--) {\n      let entry = list[idx];\n      if (this._validate(entry, properties, ownPropertyNames)) {\n        return entry;\n      }\n    }\n  }\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/**\n * @const {!Object<string, !HTMLTemplateElement>}\n */\nconst templateMap = {};\nexport default templateMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport documentWait from './document-wait.js';\n\n/**\n * @typedef {HTMLStyleElement | {getStyle: function():HTMLStyleElement}}\n */\nexport let CustomStyleProvider;\n\nconst SEEN_MARKER = '__seenByShadyCSS';\nconst CACHED_STYLE = '__shadyCSSCachedStyle';\n\n/** @type {?function(!HTMLStyleElement)} */\nlet transformFn = null;\n\n/** @type {?function()} */\nlet validateFn = null;\n\n/**\nThis interface is provided to add document-level <style> elements to ShadyCSS for processing.\nThese styles must be processed by ShadyCSS to simulate ShadowRoot upper-bound encapsulation from outside styles\nIn addition, these styles may also need to be processed for @apply rules and CSS Custom Properties\n\nTo add document-level styles to ShadyCSS, one can call `ShadyCSS.addDocumentStyle(styleElement)` or `ShadyCSS.addDocumentStyle({getStyle: () => styleElement})`\n\nIn addition, if the process used to discover document-level styles can be synchronously flushed, one should set `ShadyCSS.documentStyleFlush`.\nThis function will be called when calculating styles.\n\nAn example usage of the document-level styling api can be found in `examples/document-style-lib.js`\n\n@unrestricted\n*/\nexport default class CustomStyleInterface {\n  constructor() {\n    /** @type {!Array<!CustomStyleProvider>} */\n    this['customStyles'] = [];\n    this['enqueued'] = false;\n  }\n  /**\n   * Queue a validation for new custom styles to batch style recalculations\n   */\n  enqueueDocumentValidation() {\n    if (this['enqueued'] || !validateFn) {\n      return;\n    }\n    this['enqueued'] = true;\n    documentWait(validateFn);\n  }\n  /**\n   * @param {!HTMLStyleElement} style\n   */\n  addCustomStyle(style) {\n    if (!style[SEEN_MARKER]) {\n      style[SEEN_MARKER] = true;\n      this['customStyles'].push(style);\n      this.enqueueDocumentValidation();\n    }\n  }\n  /**\n   * @param {!CustomStyleProvider} customStyle\n   * @return {HTMLStyleElement}\n   */\n  getStyleForCustomStyle(customStyle) {\n    if (customStyle[CACHED_STYLE]) {\n      return customStyle[CACHED_STYLE];\n    }\n    let style;\n    if (customStyle['getStyle']) {\n      style = customStyle['getStyle']();\n    } else {\n      style = customStyle;\n    }\n    return style;\n  }\n  /**\n   * @return {!Array<!CustomStyleProvider>}\n   */\n  processStyles() {\n    const cs = this['customStyles'];\n    for (let i = 0; i < cs.length; i++) {\n      const customStyle = cs[i];\n      if (customStyle[CACHED_STYLE]) {\n        continue;\n      }\n      const style = this.getStyleForCustomStyle(customStyle);\n      if (style) {\n        // HTMLImports polyfill may have cloned the style into the main document,\n        // which is referenced with __appliedElement.\n        const styleToTransform = /** @type {!HTMLStyleElement} */(style['__appliedElement'] || style);\n        if (transformFn) {\n          transformFn(styleToTransform);\n        }\n        customStyle[CACHED_STYLE] = styleToTransform;\n      }\n    }\n    return cs;\n  }\n}\n\nCustomStyleInterface.prototype['addCustomStyle'] = CustomStyleInterface.prototype.addCustomStyle;\nCustomStyleInterface.prototype['getStyleForCustomStyle'] = CustomStyleInterface.prototype.getStyleForCustomStyle;\nCustomStyleInterface.prototype['processStyles'] = CustomStyleInterface.prototype.processStyles;\n\nObject.defineProperties(CustomStyleInterface.prototype, {\n  'transformCallback': {\n    /** @return {?function(!HTMLStyleElement)} */\n    get() {\n      return transformFn;\n    },\n    /** @param {?function(!HTMLStyleElement)} fn */\n    set(fn) {\n      transformFn = fn;\n    }\n  },\n  'validateCallback': {\n    /** @return {?function()} */\n    get() {\n      return validateFn;\n    },\n    /**\n     * @param {?function()} fn\n     * @this {CustomStyleInterface}\n     */\n    set(fn) {\n      let needsEnqueue = false;\n      if (!validateFn) {\n        needsEnqueue = true;\n      }\n      validateFn = fn;\n      if (needsEnqueue) {\n        this.enqueueDocumentValidation();\n      }\n    },\n  }\n})\n\n/** @typedef {{\n * customStyles: !Array<!CustomStyleProvider>,\n * addCustomStyle: function(!CustomStyleProvider),\n * getStyleForCustomStyle: function(!CustomStyleProvider): HTMLStyleElement,\n * findStyles: function(),\n * transformCallback: ?function(!HTMLStyleElement),\n * validateCallback: ?function()\n * }}\n */\nexport let CustomStyleInterfaceInterface;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {parse, StyleNode} from './css-parse.js';\nimport {nativeShadow, nativeCssVariables} from './style-settings.js';\nimport StyleTransformer from './style-transformer.js';\nimport * as StyleUtil from './style-util.js';\nimport StyleProperties from './style-properties.js';\nimport placeholderMap from './style-placeholder.js';\nimport StyleInfo from './style-info.js';\nimport StyleCache from './style-cache.js';\nimport {flush as watcherFlush} from './document-watcher.js';\nimport templateMap from './template-map.js';\nimport * as ApplyShimUtils from './apply-shim-utils.js';\nimport documentWait from './document-wait.js';\nimport {updateNativeProperties, detectMixin} from './common-utils.js';\nimport {CustomStyleInterfaceInterface} from './custom-style-interface.js'; // eslint-disable-line no-unused-vars\n\n/**\n * @const {StyleCache}\n */\nconst styleCache = new StyleCache();\n\nexport default class ScopingShim {\n  constructor() {\n    this._scopeCounter = {};\n    this._documentOwner = document.documentElement;\n    let ast = new StyleNode();\n    ast['rules'] = [];\n    this._documentOwnerStyleInfo = StyleInfo.set(this._documentOwner, new StyleInfo(ast));\n    this._elementsHaveApplied = false;\n    this._applyShim = null;\n    /** @type {?CustomStyleInterfaceInterface} */\n    this._customStyleInterface = null;\n    documentWait(() => {\n      this._ensure();\n    });\n  }\n  flush() {\n    watcherFlush();\n  }\n  _generateScopeSelector(name) {\n    let id = this._scopeCounter[name] = (this._scopeCounter[name] || 0) + 1;\n    return `${name}-${id}`;\n  }\n  getStyleAst(style) {\n    return StyleUtil.rulesForStyle(style);\n  }\n  styleAstToString(ast) {\n    return StyleUtil.toCssText(ast);\n  }\n  _gatherStyles(template) {\n    return StyleUtil.gatherStyleText(template.content);\n  }\n  _getCssBuild(template) {\n    let style = template.content.querySelector('style');\n    if (!style) {\n      return '';\n    }\n    return style.getAttribute('css-build') || '';\n  }\n  /**\n   * Prepare the styling and template for the given element type\n   *\n   * @param {HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} typeExtension\n   */\n  prepareTemplate(template, elementName, typeExtension) {\n    if (template._prepared) {\n      return;\n    }\n    template._prepared = true;\n    template.name = elementName;\n    template.extends = typeExtension;\n    templateMap[elementName] = template;\n    let cssBuild = this._getCssBuild(template);\n    let cssText = this._gatherStyles(template);\n    let info = {\n      is: elementName,\n      extends: typeExtension,\n      __cssBuild: cssBuild,\n    };\n    if (!nativeShadow) {\n      StyleTransformer.dom(template.content, elementName);\n    }\n    // check if the styling has mixin definitions or uses\n    this._ensure();\n    let hasMixins = detectMixin(cssText)\n    let ast = parse(cssText);\n    // only run the applyshim transforms if there is a mixin involved\n    if (hasMixins && nativeCssVariables && this._applyShim) {\n      this._applyShim['transformRules'](ast, elementName);\n    }\n    template['_styleAst'] = ast;\n    template._cssBuild = cssBuild;\n\n    let ownPropertyNames = [];\n    if (!nativeCssVariables) {\n      ownPropertyNames = StyleProperties.decorateStyles(template['_styleAst'], info);\n    }\n    if (!ownPropertyNames.length || nativeCssVariables) {\n      let root = nativeShadow ? template.content : null;\n      let placeholder = placeholderMap[elementName];\n      let style = this._generateStaticStyle(info, template['_styleAst'], root, placeholder);\n      template._style = style;\n    }\n    template._ownPropertyNames = ownPropertyNames;\n  }\n  _generateStaticStyle(info, rules, shadowroot, placeholder) {\n    let cssText = StyleTransformer.elementStyles(info, rules);\n    if (cssText.length) {\n      return StyleUtil.applyCss(cssText, info.is, shadowroot, placeholder);\n    }\n  }\n  _prepareHost(host) {\n    let {is, typeExtension} = StyleUtil.getIsExtends(host);\n    let placeholder = placeholderMap[is];\n    let template = templateMap[is];\n    let ast;\n    let ownStylePropertyNames;\n    let cssBuild;\n    if (template) {\n      ast = template['_styleAst'];\n      ownStylePropertyNames = template._ownPropertyNames;\n      cssBuild = template._cssBuild;\n    }\n    return StyleInfo.set(host,\n      new StyleInfo(\n        ast,\n        placeholder,\n        ownStylePropertyNames,\n        is,\n        typeExtension,\n        cssBuild\n      )\n    );\n  }\n  _ensureApplyShim() {\n    if (this._applyShim) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.ApplyShim) {\n      this._applyShim = window.ShadyCSS.ApplyShim;\n      this._applyShim['invalidCallback'] = ApplyShimUtils.invalidate;\n    }\n  }\n  _ensureCustomStyleInterface() {\n    if (this._customStyleInterface) {\n      return;\n    } else if (window.ShadyCSS && window.ShadyCSS.CustomStyleInterface) {\n      this._customStyleInterface = /** @type {!CustomStyleInterfaceInterface} */(window.ShadyCSS.CustomStyleInterface);\n      /** @type {function(!HTMLStyleElement)} */\n      this._customStyleInterface['transformCallback'] = (style) => {this.transformCustomStyleForDocument(style)};\n      this._customStyleInterface['validateCallback'] = () => {\n        requestAnimationFrame(() => {\n          if (this._customStyleInterface['enqueued'] || this._elementsHaveApplied) {\n            this.flushCustomStyles();\n          }\n        })\n      };\n    }\n  }\n  _ensure() {\n    this._ensureApplyShim();\n    this._ensureCustomStyleInterface();\n  }\n  /**\n   * Flush and apply custom styles to document\n   */\n  flushCustomStyles() {\n    this._ensure();\n    if (!this._customStyleInterface) {\n      return;\n    }\n    let customStyles = this._customStyleInterface['processStyles']();\n    // early return if custom-styles don't need validation\n    if (!this._customStyleInterface['enqueued']) {\n      return;\n    }\n    if (!nativeCssVariables) {\n      this._updateProperties(this._documentOwner, this._documentOwnerStyleInfo);\n      this._applyCustomStyles(customStyles);\n    } else {\n      this._revalidateCustomStyleApplyShim(customStyles);\n    }\n    this._customStyleInterface['enqueued'] = false;\n    // if custom elements have upgraded and there are no native css variables, we must recalculate the whole tree\n    if (this._elementsHaveApplied && !nativeCssVariables) {\n      this.styleDocument();\n    }\n  }\n  /**\n   * Apply styles for the given element\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} overrideProps\n   */\n  styleElement(host, overrideProps) {\n    let {is} = StyleUtil.getIsExtends(host);\n    let styleInfo = StyleInfo.get(host);\n    if (!styleInfo) {\n      styleInfo = this._prepareHost(host);\n    }\n    // Only trip the `elementsHaveApplied` flag if a node other that the root document has `applyStyle` called\n    if (!this._isRootOwner(host)) {\n      this._elementsHaveApplied = true;\n    }\n    if (overrideProps) {\n      styleInfo.overrideStyleProperties =\n        styleInfo.overrideStyleProperties || {};\n      Object.assign(styleInfo.overrideStyleProperties, overrideProps);\n    }\n    if (!nativeCssVariables) {\n     this._updateProperties(host, styleInfo);\n      if (styleInfo.ownStylePropertyNames && styleInfo.ownStylePropertyNames.length) {\n        this._applyStyleProperties(host, styleInfo);\n      }\n    } else {\n      if (styleInfo.overrideStyleProperties) {\n        updateNativeProperties(host, styleInfo.overrideStyleProperties);\n      }\n      let template = templateMap[is];\n      // bail early if there is no shadowroot for this element\n      if (!template && !this._isRootOwner(host)) {\n        return;\n      }\n      if (template && template._style && !ApplyShimUtils.templateIsValid(template)) {\n        // update template\n        if (!ApplyShimUtils.templateIsValidating(template)) {\n          this._ensure();\n          this._applyShim && this._applyShim['transformRules'](template['_styleAst'], is);\n          template._style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          ApplyShimUtils.startValidatingTemplate(template);\n        }\n        // update instance if native shadowdom\n        if (nativeShadow) {\n          let root = host.shadowRoot;\n          if (root) {\n            let style = root.querySelector('style');\n            style.textContent = StyleTransformer.elementStyles(host, styleInfo.styleRules);\n          }\n        }\n        styleInfo.styleRules = template['_styleAst'];\n      }\n    }\n  }\n  _styleOwnerForNode(node) {\n    let root = node.getRootNode();\n    let host = root.host;\n    if (host) {\n      if (StyleInfo.get(host)) {\n        return host;\n      } else {\n        return this._styleOwnerForNode(host);\n      }\n    }\n    return this._documentOwner;\n  }\n  _isRootOwner(node) {\n    return (node === this._documentOwner);\n  }\n  _applyStyleProperties(host, styleInfo) {\n    let is = StyleUtil.getIsExtends(host).is;\n    let cacheEntry = styleCache.fetch(is, styleInfo.styleProperties, styleInfo.ownStylePropertyNames);\n    let cachedScopeSelector = cacheEntry && cacheEntry.scopeSelector;\n    let cachedStyle = cacheEntry ? cacheEntry.styleElement : null;\n    let oldScopeSelector = styleInfo.scopeSelector;\n    // only generate new scope if cached style is not found\n    styleInfo.scopeSelector = cachedScopeSelector || this._generateScopeSelector(is);\n    let style = StyleProperties.applyElementStyle(host, styleInfo.styleProperties, styleInfo.scopeSelector, cachedStyle);\n    if (!nativeShadow) {\n      StyleProperties.applyElementScopeSelector(host, styleInfo.scopeSelector, oldScopeSelector);\n    }\n    if (!cacheEntry) {\n      styleCache.store(is, styleInfo.styleProperties, style, styleInfo.scopeSelector);\n    }\n    return style;\n  }\n  _updateProperties(host, styleInfo) {\n    let owner = this._styleOwnerForNode(host);\n    let ownerStyleInfo = StyleInfo.get(owner);\n    let ownerProperties = ownerStyleInfo.styleProperties;\n    let props = Object.create(ownerProperties || null);\n    let hostAndRootProps = StyleProperties.hostAndRootPropertiesForScope(host, styleInfo.styleRules);\n    let propertyData = StyleProperties.propertyDataFromStyles(ownerStyleInfo.styleRules, host);\n    let propertiesMatchingHost = propertyData.properties\n    Object.assign(\n      props,\n      hostAndRootProps.hostProps,\n      propertiesMatchingHost,\n      hostAndRootProps.rootProps\n    );\n    this._mixinOverrideStyles(props, styleInfo.overrideStyleProperties);\n    StyleProperties.reify(props);\n    styleInfo.styleProperties = props;\n  }\n  _mixinOverrideStyles(props, overrides) {\n    for (let p in overrides) {\n      let v = overrides[p];\n      // skip override props if they are not truthy or 0\n      // in order to fall back to inherited values\n      if (v || v === 0) {\n        props[p] = v;\n      }\n    }\n  }\n  /**\n   * Update styles of the whole document\n   *\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    this.styleSubtree(this._documentOwner, properties);\n  }\n  /**\n   * Update styles of a subtree\n   *\n   * @param {!HTMLElement} host\n   * @param {Object=} properties\n   */\n  styleSubtree(host, properties) {\n    let root = host.shadowRoot;\n    if (root || this._isRootOwner(host)) {\n      this.styleElement(host, properties);\n    }\n    // process the shadowdom children of `host`\n    let shadowChildren = root && (root.children || root.childNodes);\n    if (shadowChildren) {\n      for (let i = 0; i < shadowChildren.length; i++) {\n        let c = /** @type {!HTMLElement} */(shadowChildren[i]);\n        this.styleSubtree(c);\n      }\n    } else {\n      // process the lightdom children of `host`\n      let children = host.children || host.childNodes;\n      if (children) {\n        for (let i = 0; i < children.length; i++) {\n          let c = /** @type {!HTMLElement} */(children[i]);\n          this.styleSubtree(c);\n        }\n      }\n    }\n  }\n  /* Custom Style operations */\n  _revalidateCustomStyleApplyShim(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        this._revalidateApplyShim(s);\n      }\n    }\n  }\n  _applyCustomStyles(customStyles) {\n    for (let i = 0; i < customStyles.length; i++) {\n      let c = customStyles[i];\n      let s = this._customStyleInterface['getStyleForCustomStyle'](c);\n      if (s) {\n        StyleProperties.applyCustomStyle(s, this._documentOwnerStyleInfo.styleProperties);\n      }\n    }\n  }\n  transformCustomStyleForDocument(style) {\n    let ast = StyleUtil.rulesForStyle(style);\n    StyleUtil.forEachRule(ast, (rule) => {\n      if (nativeShadow) {\n        StyleTransformer.normalizeRootSelector(rule);\n      } else {\n        StyleTransformer.documentRule(rule);\n      }\n      if (nativeCssVariables) {\n        this._ensure();\n        this._applyShim && this._applyShim['transformRule'](rule);\n      }\n    });\n    if (nativeCssVariables) {\n      style.textContent = StyleUtil.toCssText(ast);\n    } else {\n      this._documentOwnerStyleInfo.styleRules.rules.push(ast);\n    }\n  }\n  _revalidateApplyShim(style) {\n    if (nativeCssVariables && this._applyShim) {\n      let ast = StyleUtil.rulesForStyle(style);\n      this._ensure();\n      this._applyShim['transformRules'](ast);\n      style.textContent = StyleUtil.toCssText(ast);\n    }\n  }\n  getComputedStyleValue(element, property) {\n    let value;\n    if (!nativeCssVariables) {\n      // element is either a style host, or an ancestor of a style host\n      let styleInfo = StyleInfo.get(element) || StyleInfo.get(this._styleOwnerForNode(element));\n      value = styleInfo.styleProperties[property];\n    }\n    // fall back to the property value from the computed styling\n    value = value || window.getComputedStyle(element).getPropertyValue(property);\n    // trim whitespace that can come after the `:` in css\n    // example: padding: 2px -> \" 2px\"\n    return value ? value.trim() : '';\n  }\n  // given an element and a classString, replaces\n  // the element's class with the provided classString and adds\n  // any necessary ShadyCSS static and property based scoping selectors\n  setElementClass(element, classString) {\n    let root = element.getRootNode();\n    let classes = classString ? classString.split(/\\s/) : [];\n    let scopeName = root.host && root.host.localName;\n    // If no scope, try to discover scope name from existing class.\n    // This can occur if, for example, a template stamped element that\n    // has been scoped is manipulated when not in a root.\n    if (!scopeName) {\n      var classAttr = element.getAttribute('class');\n      if (classAttr) {\n        let k$ = classAttr.split(/\\s/);\n        for (let i=0; i < k$.length; i++) {\n          if (k$[i] === StyleTransformer.SCOPE_NAME) {\n            scopeName = k$[i+1];\n            break;\n          }\n        }\n      }\n    }\n    if (scopeName) {\n      classes.push(StyleTransformer.SCOPE_NAME, scopeName);\n    }\n    if (!nativeCssVariables) {\n      let styleInfo = StyleInfo.get(element);\n      if (styleInfo && styleInfo.scopeSelector) {\n        classes.push(StyleProperties.XSCOPE_NAME, styleInfo.scopeSelector);\n      }\n    }\n    StyleUtil.setElementClassRaw(element, classes.join(' '));\n  }\n  _styleInfoForNode(node) {\n    return StyleInfo.get(node);\n  }\n}\n\n/* exports */\nScopingShim.prototype['flush'] = ScopingShim.prototype.flush;\nScopingShim.prototype['prepareTemplate'] = ScopingShim.prototype.prepareTemplate;\nScopingShim.prototype['styleElement'] = ScopingShim.prototype.styleElement;\nScopingShim.prototype['styleDocument'] = ScopingShim.prototype.styleDocument;\nScopingShim.prototype['styleSubtree'] = ScopingShim.prototype.styleSubtree;\nScopingShim.prototype['getComputedStyleValue'] = ScopingShim.prototype.getComputedStyleValue;\nScopingShim.prototype['setElementClass'] = ScopingShim.prototype.setElementClass;\nScopingShim.prototype['_styleInfoForNode'] = ScopingShim.prototype._styleInfoForNode;\nScopingShim.prototype['transformCustomStyleForDocument'] = ScopingShim.prototype.transformCustomStyleForDocument;\nScopingShim.prototype['getStyleAst'] = ScopingShim.prototype.getStyleAst;\nScopingShim.prototype['styleAstToString'] = ScopingShim.prototype.styleAstToString;\nScopingShim.prototype['flushCustomStyles'] = ScopingShim.prototype.flushCustomStyles;\nObject.defineProperties(ScopingShim.prototype, {\n  'nativeShadow': {\n    get() {\n      return nativeShadow;\n    }\n  },\n  'nativeCss': {\n    get() {\n      return nativeCssVariables;\n    }\n  }\n});","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport ScopingShim from '../src/scoping-shim.js';\nimport {nativeCssVariables, nativeShadow} from '../src/style-settings.js';\n\n/** @const {ScopingShim} */\nconst scopingShim = new ScopingShim();\n\nlet ApplyShim, CustomStyleInterface;\n\nif (window['ShadyCSS']) {\n  ApplyShim = window['ShadyCSS']['ApplyShim'];\n  CustomStyleInterface = window['ShadyCSS']['CustomStyleInterface'];\n}\n\nwindow.ShadyCSS = {\n  ScopingShim: scopingShim,\n  /**\n   * @param {!HTMLTemplateElement} template\n   * @param {string} elementName\n   * @param {string=} elementExtends\n   */\n  prepareTemplate(template, elementName, elementExtends) {\n    scopingShim.flushCustomStyles();\n    scopingShim.prepareTemplate(template, elementName, elementExtends)\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   * @param {Object=} properties\n   */\n  styleSubtree(element, properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleSubtree(element, properties);\n  },\n\n  /**\n   * @param {!HTMLElement} element\n   */\n  styleElement(element) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleElement(element);\n  },\n\n  /**\n   * @param {Object=} properties\n   */\n  styleDocument(properties) {\n    scopingShim.flushCustomStyles();\n    scopingShim.styleDocument(properties);\n  },\n\n  /**\n   * @param {Element} element\n   * @param {string} property\n   * @return {string}\n   */\n  getComputedStyleValue(element, property) {\n    return scopingShim.getComputedStyleValue(element, property);\n  },\n\n  nativeCss: nativeCssVariables,\n\n  nativeShadow: nativeShadow\n};\n\nif (ApplyShim) {\n  window.ShadyCSS.ApplyShim = ApplyShim;\n}\n\nif (CustomStyleInterface) {\n  window.ShadyCSS.CustomStyleInterface = CustomStyleInterface;\n}","/**\n * @license\n * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.\n * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\n * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\n * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\n * Code distributed by Google as part of the polymer project is also\n * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n */\n\n'use strict';\n// It's desireable to provide a default stylesheet\n// that's convenient for styling unresolved elements, but\n// it's cumbersome to have to include this manually in every page.\n// It would make sense to put inside some HTMLImport but\n// the HTMLImports polyfill does not allow loading of stylesheets\n// that block rendering. Therefore this injection is tolerated here.\n//\n// NOTE: position: relative fixes IE's failure to inherit opacity\n// when a child is not statically positioned.\nlet style = document.createElement('style');\nstyle.textContent = ''\n    + 'body {'\n    + 'transition: opacity ease-in 0.2s;'\n    + ' } \\n'\n    + 'body[unresolved] {'\n    + 'opacity: 0; display: block; overflow: hidden; position: relative;'\n    + ' } \\n'\n    ;\nlet head = document.querySelector('head');\nhead.insertBefore(style, 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\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index a4b380d..ec260e5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3,28 +3,28 @@
 
 
 "@webcomponents/custom-elements@github:webcomponents/custom-elements":
-  version "1.0.1"
-  resolved "https://codeload.github.com/webcomponents/custom-elements/tar.gz/ec3c391fe26e88e73a033ad227d4ad0ed5adfd4e"
+  version "1.0.8"
+  resolved "https://codeload.github.com/webcomponents/custom-elements/tar.gz/566a4256d9b45d1f642702aa298e468380b9b1a8"
 
 "@webcomponents/shadycss@github:webcomponents/shadycss":
-  version "1.0.3"
-  resolved "https://codeload.github.com/webcomponents/shadycss/tar.gz/930c7526611c9bf245decf6f751f9838d78f37aa"
+  version "1.1.1"
+  resolved "https://codeload.github.com/webcomponents/shadycss/tar.gz/b51eea17d43b9e7ad80c6cc750e097236d24bbc2"
 
 "@webcomponents/shadydom@github:webcomponents/shadydom":
-  version "1.0.1"
-  resolved "https://codeload.github.com/webcomponents/shadydom/tar.gz/3e6284ee1ab84976f0511fe83320ce88e8bd5985"
+  version "1.0.12"
+  resolved "https://codeload.github.com/webcomponents/shadydom/tar.gz/d146fd082214bb9489c24721ea317baa0d79377c"
 
 "@webcomponents/template@github:webcomponents/template":
-  version "1.0.0"
-  resolved "https://codeload.github.com/webcomponents/template/tar.gz/e652a507a6662f1d09761937c8aa81d02fec4dc5"
+  version "1.2.2"
+  resolved "https://codeload.github.com/webcomponents/template/tar.gz/dcf0da93c5479d618b7ccfcd5c13a2fdc455e850"
 
 "@webcomponents/webcomponents-platform@github:webcomponents/webcomponents-platform", "webcomponents-platform@github:webcomponents/webcomponents-platform":
   version "1.0.0"
   resolved "https://codeload.github.com/webcomponents/webcomponents-platform/tar.gz/a9afb7e065fe35f3d9bf59c94c76dbcc9478582e"
 
 "@webcomponents/webcomponentsjs@github:webcomponents/webcomponentsjs", "webcomponents.js@github:webcomponents/webcomponentsjs":
-  version "1.0.5"
-  resolved "https://codeload.github.com/webcomponents/webcomponentsjs/tar.gz/8839a8a58a1cbd0e39be527b5e18c220c1e80424"
+  version "1.1.0"
+  resolved "https://codeload.github.com/webcomponents/webcomponentsjs/tar.gz/6d7e89a8ff2a27a8ee7077bcf984c15e597c05f4"
 
 align-text@^0.1.1, align-text@^0.1.3:
   version "0.1.4"
@@ -42,49 +42,49 @@ ansi-styles@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
 
-babel-code-frame@^6.22.0:
-  version "6.22.0"
-  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.22.0.tgz#027620bee567a88c32561574e7fd0801d33118e4"
+babel-code-frame@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
   dependencies:
-    chalk "^1.1.0"
+    chalk "^1.1.3"
     esutils "^2.0.2"
-    js-tokens "^3.0.0"
+    js-tokens "^3.0.2"
 
-babel-core@6, babel-core@^6.24.1:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.25.0.tgz#7dd42b0463c742e9d5296deb3ec67a9322dad729"
+babel-core@6, babel-core@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.26.0.tgz#af32f78b31a6fcef119c87b0fd8d9753f03a0bb8"
   dependencies:
-    babel-code-frame "^6.22.0"
-    babel-generator "^6.25.0"
+    babel-code-frame "^6.26.0"
+    babel-generator "^6.26.0"
     babel-helpers "^6.24.1"
     babel-messages "^6.23.0"
-    babel-register "^6.24.1"
-    babel-runtime "^6.22.0"
-    babel-template "^6.25.0"
-    babel-traverse "^6.25.0"
-    babel-types "^6.25.0"
-    babylon "^6.17.2"
-    convert-source-map "^1.1.0"
-    debug "^2.1.1"
-    json5 "^0.5.0"
-    lodash "^4.2.0"
-    minimatch "^3.0.2"
-    path-is-absolute "^1.0.0"
-    private "^0.1.6"
+    babel-register "^6.26.0"
+    babel-runtime "^6.26.0"
+    babel-template "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    convert-source-map "^1.5.0"
+    debug "^2.6.8"
+    json5 "^0.5.1"
+    lodash "^4.17.4"
+    minimatch "^3.0.4"
+    path-is-absolute "^1.0.1"
+    private "^0.1.7"
     slash "^1.0.0"
-    source-map "^0.5.0"
+    source-map "^0.5.6"
 
-babel-generator@^6.25.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.25.0.tgz#33a1af70d5f2890aeb465a4a7793c1df6a9ea9fc"
+babel-generator@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.26.0.tgz#ac1ae20070b79f6e3ca1d3269613053774f20dc5"
   dependencies:
     babel-messages "^6.23.0"
-    babel-runtime "^6.22.0"
-    babel-types "^6.25.0"
+    babel-runtime "^6.26.0"
+    babel-types "^6.26.0"
     detect-indent "^4.0.0"
     jsesc "^1.3.0"
-    lodash "^4.2.0"
-    source-map "^0.5.0"
+    lodash "^4.17.4"
+    source-map "^0.5.6"
     trim-right "^1.0.1"
 
 babel-helper-builder-binary-assignment-operator-visitor@^6.24.1:
@@ -105,13 +105,13 @@ babel-helper-call-delegate@^6.24.1:
     babel-types "^6.24.1"
 
 babel-helper-define-map@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-helper-define-map/-/babel-helper-define-map-6.24.1.tgz#7a9747f258d8947d32d515f6aa1c7bd02204a080"
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-helper-define-map/-/babel-helper-define-map-6.26.0.tgz#a5f56dab41a25f97ecb498c7ebaca9819f95be5f"
   dependencies:
     babel-helper-function-name "^6.24.1"
-    babel-runtime "^6.22.0"
-    babel-types "^6.24.1"
-    lodash "^4.2.0"
+    babel-runtime "^6.26.0"
+    babel-types "^6.26.0"
+    lodash "^4.17.4"
 
 babel-helper-explode-assignable-expression@^6.24.1:
   version "6.24.1"
@@ -153,12 +153,12 @@ babel-helper-optimise-call-expression@^6.24.1:
     babel-types "^6.24.1"
 
 babel-helper-regex@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-helper-regex/-/babel-helper-regex-6.24.1.tgz#d36e22fab1008d79d88648e32116868128456ce8"
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-helper-regex/-/babel-helper-regex-6.26.0.tgz#325c59f902f82f24b74faceed0363954f6495e72"
   dependencies:
-    babel-runtime "^6.22.0"
-    babel-types "^6.24.1"
-    lodash "^4.2.0"
+    babel-runtime "^6.26.0"
+    babel-types "^6.26.0"
+    lodash "^4.17.4"
 
 babel-helper-remap-async-to-generator@^6.24.1:
   version "6.24.1"
@@ -239,14 +239,14 @@ babel-plugin-transform-es2015-block-scoped-functions@^6.22.0:
     babel-runtime "^6.22.0"
 
 babel-plugin-transform-es2015-block-scoping@^6.23.0:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.24.1.tgz#76c295dc3a4741b1665adfd3167215dcff32a576"
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz#d70f5299c1308d05c12f463813b0a09e73b1895f"
   dependencies:
-    babel-runtime "^6.22.0"
-    babel-template "^6.24.1"
-    babel-traverse "^6.24.1"
-    babel-types "^6.24.1"
-    lodash "^4.2.0"
+    babel-runtime "^6.26.0"
+    babel-template "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    lodash "^4.17.4"
 
 babel-plugin-transform-es2015-classes@^6.23.0, babel-plugin-transform-es2015-classes@^6.9.0:
   version "6.24.1"
@@ -311,13 +311,13 @@ babel-plugin-transform-es2015-modules-amd@^6.22.0, babel-plugin-transform-es2015
     babel-template "^6.24.1"
 
 babel-plugin-transform-es2015-modules-commonjs@^6.23.0, babel-plugin-transform-es2015-modules-commonjs@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.24.1.tgz#d3e310b40ef664a36622200097c6d440298f2bfe"
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.0.tgz#0d8394029b7dc6abe1a97ef181e00758dd2e5d8a"
   dependencies:
     babel-plugin-transform-strict-mode "^6.24.1"
-    babel-runtime "^6.22.0"
-    babel-template "^6.24.1"
-    babel-types "^6.24.1"
+    babel-runtime "^6.26.0"
+    babel-template "^6.26.0"
+    babel-types "^6.26.0"
 
 babel-plugin-transform-es2015-modules-systemjs@^6.23.0:
   version "6.24.1"
@@ -403,10 +403,10 @@ babel-plugin-transform-exponentiation-operator@^6.22.0:
     babel-runtime "^6.22.0"
 
 babel-plugin-transform-regenerator@^6.22.0:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.24.1.tgz#b8da305ad43c3c99b4848e4fe4037b770d23c418"
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-regenerator/-/babel-plugin-transform-regenerator-6.26.0.tgz#e0703696fbde27f0a3efcacf8b4dca2f7b3a8f2f"
   dependencies:
-    regenerator-transform "0.9.11"
+    regenerator-transform "^0.10.0"
 
 babel-plugin-transform-strict-mode@^6.24.1:
   version "6.24.1"
@@ -416,8 +416,8 @@ babel-plugin-transform-strict-mode@^6.24.1:
     babel-types "^6.24.1"
 
 babel-preset-env@^1.2.2:
-  version "1.6.0"
-  resolved "https://registry.yarnpkg.com/babel-preset-env/-/babel-preset-env-1.6.0.tgz#2de1c782a780a0a5d605d199c957596da43c44e4"
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/babel-preset-env/-/babel-preset-env-1.6.1.tgz#a18b564cc9b9afdf4aae57ae3c1b0d99188e6f48"
   dependencies:
     babel-plugin-check-es2015-constants "^6.22.0"
     babel-plugin-syntax-trailing-function-commas "^6.22.0"
@@ -450,61 +450,61 @@ babel-preset-env@^1.2.2:
     invariant "^2.2.2"
     semver "^5.3.0"
 
-babel-register@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.24.1.tgz#7e10e13a2f71065bdfad5a1787ba45bca6ded75f"
+babel-register@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.26.0.tgz#6ed021173e2fcb486d7acb45c6009a856f647071"
   dependencies:
-    babel-core "^6.24.1"
-    babel-runtime "^6.22.0"
-    core-js "^2.4.0"
+    babel-core "^6.26.0"
+    babel-runtime "^6.26.0"
+    core-js "^2.5.0"
     home-or-tmp "^2.0.0"
-    lodash "^4.2.0"
+    lodash "^4.17.4"
     mkdirp "^0.5.1"
-    source-map-support "^0.4.2"
+    source-map-support "^0.4.15"
 
-babel-runtime@^6.18.0, babel-runtime@^6.22.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.25.0.tgz#33b98eaa5d482bb01a8d1aa6b437ad2b01aec41c"
+babel-runtime@^6.18.0, babel-runtime@^6.22.0, babel-runtime@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.26.0.tgz#965c7058668e82b55d7bfe04ff2337bc8b5647fe"
   dependencies:
     core-js "^2.4.0"
-    regenerator-runtime "^0.10.0"
+    regenerator-runtime "^0.11.0"
 
-babel-template@^6.24.1, babel-template@^6.25.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.25.0.tgz#665241166b7c2aa4c619d71e192969552b10c071"
+babel-template@^6.24.1, babel-template@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.26.0.tgz#de03e2d16396b069f46dd9fff8521fb1a0e35e02"
   dependencies:
-    babel-runtime "^6.22.0"
-    babel-traverse "^6.25.0"
-    babel-types "^6.25.0"
-    babylon "^6.17.2"
-    lodash "^4.2.0"
+    babel-runtime "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    lodash "^4.17.4"
 
-babel-traverse@^6.24.1, babel-traverse@^6.25.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.25.0.tgz#2257497e2fcd19b89edc13c4c91381f9512496f1"
+babel-traverse@^6.24.1, babel-traverse@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-traverse/-/babel-traverse-6.26.0.tgz#46a9cbd7edcc62c8e5c064e2d2d8d0f4035766ee"
   dependencies:
-    babel-code-frame "^6.22.0"
+    babel-code-frame "^6.26.0"
     babel-messages "^6.23.0"
-    babel-runtime "^6.22.0"
-    babel-types "^6.25.0"
-    babylon "^6.17.2"
-    debug "^2.2.0"
-    globals "^9.0.0"
-    invariant "^2.2.0"
-    lodash "^4.2.0"
+    babel-runtime "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    debug "^2.6.8"
+    globals "^9.18.0"
+    invariant "^2.2.2"
+    lodash "^4.17.4"
 
-babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.25.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.25.0.tgz#70afb248d5660e5d18f811d91c8303b54134a18e"
+babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.26.0:
+  version "6.26.0"
+  resolved "https://registry.yarnpkg.com/babel-types/-/babel-types-6.26.0.tgz#a3b073f94ab49eb6fa55cd65227a334380632497"
   dependencies:
-    babel-runtime "^6.22.0"
+    babel-runtime "^6.26.0"
     esutils "^2.0.2"
-    lodash "^4.2.0"
-    to-fast-properties "^1.0.1"
+    lodash "^4.17.4"
+    to-fast-properties "^1.0.3"
 
-babylon@^6.17.2:
-  version "6.17.4"
-  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.17.4.tgz#3e8b7402b88d22c3423e137a1577883b15ff869a"
+babylon@^6.18.0:
+  version "6.18.0"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
 
 balanced-match@^1.0.0:
   version "1.0.0"
@@ -518,19 +518,19 @@ brace-expansion@^1.1.7:
     concat-map "0.0.1"
 
 browserslist@^2.1.2:
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-2.3.0.tgz#b2aa76415c71643fe2368f6243b43bbbb4211752"
+  version "2.11.3"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-2.11.3.tgz#fe36167aed1bbcde4827ebfe71347a2cc70b99b2"
   dependencies:
-    caniuse-lite "^1.0.30000710"
-    electron-to-chromium "^1.3.17"
+    caniuse-lite "^1.0.30000792"
+    electron-to-chromium "^1.3.30"
 
 camelcase@^1.0.2:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-1.2.1.tgz#9bb5304d2e0b56698b2c758b08a3eaa9daa58a39"
 
-caniuse-lite@^1.0.30000710:
-  version "1.0.30000712"
-  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000712.tgz#b4732def2459224f3f78c6a9ba103abfcc705670"
+caniuse-lite@^1.0.30000792:
+  version "1.0.30000792"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000792.tgz#d0cea981f8118f3961471afbb43c9a1e5bbf0332"
 
 center-align@^0.1.1:
   version "0.1.3"
@@ -539,7 +539,7 @@ center-align@^0.1.1:
     align-text "^0.1.3"
     lazy-cache "^1.0.3"
 
-chalk@^1.1.0:
+chalk@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   dependencies:
@@ -561,17 +561,17 @@ concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
 
-convert-source-map@^1.1.0:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.0.tgz#9acd70851c6d5dfdd93d9282e5edf94a03ff46b5"
+convert-source-map@^1.5.0:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.1.tgz#b8278097b9bc229365de5c62cf5fcaed8b5599e5"
 
-core-js@^2.4.0:
-  version "2.5.0"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.0.tgz#569c050918be6486b3837552028ae0466b717086"
+core-js@^2.4.0, core-js@^2.5.0:
+  version "2.5.3"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.5.3.tgz#8acc38345824f16d8365b7c9b4259168e8ed603e"
 
-debug@^2.1.1, debug@^2.2.0:
-  version "2.6.8"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
+debug@^2.6.8:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies:
     ms "2.0.0"
 
@@ -585,13 +585,13 @@ detect-indent@^4.0.0:
   dependencies:
     repeating "^2.0.0"
 
-electron-to-chromium@^1.3.17:
-  version "1.3.17"
-  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.17.tgz#41c13457cc7166c5c15e767ae61d86a8cacdee5d"
+electron-to-chromium@^1.3.30:
+  version "1.3.31"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.31.tgz#00d832cba9fe2358652b0c48a8816c8e3a037e9f"
 
 "es6-promise@github:stefanpenner/es6-promise":
-  version "4.1.1"
-  resolved "https://codeload.github.com/stefanpenner/es6-promise/tar.gz/a5838bd94a76e31ad80ac1685bcd0dbc3d8ce963"
+  version "4.2.4"
+  resolved "https://codeload.github.com/stefanpenner/es6-promise/tar.gz/314e4831d5a0a85edcb084444ce089c16afdcbe2"
 
 escape-string-regexp@^1.0.2:
   version "1.0.5"
@@ -605,7 +605,7 @@ esutils@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
 
-globals@^9.0.0:
+globals@^9.18.0:
   version "9.18.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
 
@@ -622,15 +622,15 @@ home-or-tmp@^2.0.0:
     os-homedir "^1.0.0"
     os-tmpdir "^1.0.1"
 
-invariant@^2.2.0, invariant@^2.2.2:
+invariant@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/invariant/-/invariant-2.2.2.tgz#9e1f56ac0acdb6bf303306f338be3b204ae60360"
   dependencies:
     loose-envify "^1.0.0"
 
 is-buffer@^1.1.5:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.5.tgz#1f3b26ef613b214b88cbca23cc6c01d87961eecc"
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
 
 is-finite@^1.0.0:
   version "1.0.2"
@@ -638,7 +638,7 @@ is-finite@^1.0.0:
   dependencies:
     number-is-nan "^1.0.0"
 
-js-tokens@^3.0.0:
+js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
@@ -650,7 +650,7 @@ jsesc@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
 
-json5@^0.5.0:
+json5@^0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
 
@@ -664,7 +664,7 @@ lazy-cache@^1.0.3:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/lazy-cache/-/lazy-cache-1.0.4.tgz#a1d78fc3a50474cb80845d3b3b6e1da49a446e8e"
 
-lodash@^4.2.0:
+lodash@^4.17.4:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
@@ -678,7 +678,7 @@ loose-envify@^1.0.0:
   dependencies:
     js-tokens "^3.0.0"
 
-minimatch@^3.0.2:
+minimatch@^3.0.2, minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   dependencies:
@@ -714,25 +714,25 @@ os-tmpdir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
-path-is-absolute@^1.0.0:
+path-is-absolute@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
 
-private@^0.1.6:
-  version "0.1.7"
-  resolved "https://registry.yarnpkg.com/private/-/private-0.1.7.tgz#68ce5e8a1ef0a23bb570cc28537b5332aba63ef1"
+private@^0.1.6, private@^0.1.7:
+  version "0.1.8"
+  resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
 
 regenerate@^1.2.1:
-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.3.2.tgz#d1941c67bad437e1be76433add5b385f95b19260"
+  version "1.3.3"
+  resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.3.3.tgz#0c336d3980553d755c39b586ae3b20aa49c82b7f"
 
-regenerator-runtime@^0.10.0:
-  version "0.10.5"
-  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.10.5.tgz#336c3efc1220adcedda2c9fab67b5a7955a33658"
+regenerator-runtime@^0.11.0:
+  version "0.11.1"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"
 
-regenerator-transform@0.9.11:
-  version "0.9.11"
-  resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.9.11.tgz#3a7d067520cb7b7176769eb5ff868691befe1283"
+regenerator-transform@^0.10.0:
+  version "0.10.1"
+  resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.10.1.tgz#1e4996837231da8b7f3cf4114d71b5691a0680dd"
   dependencies:
     babel-runtime "^6.18.0"
     babel-types "^6.19.0"
@@ -801,22 +801,22 @@ rollup@^0.41.6:
     source-map-support "^0.4.0"
 
 semver@^5.3.0:
-  version "5.4.1"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.4.1.tgz#e059c09d8571f0540823733433505d3a2f00b18e"
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
 slash@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/slash/-/slash-1.0.0.tgz#c41f2f6c39fc16d1cd17ad4b5d896114ae470d55"
 
-source-map-support@^0.4.0, source-map-support@^0.4.2:
-  version "0.4.15"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.4.15.tgz#03202df65c06d2bd8c7ec2362a193056fef8d3b1"
+source-map-support@^0.4.0, source-map-support@^0.4.15:
+  version "0.4.18"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.4.18.tgz#0286a6de8be42641338594e97ccea75f0a2c585f"
   dependencies:
     source-map "^0.5.6"
 
-source-map@^0.5.0, source-map@^0.5.6, source-map@~0.5.1:
-  version "0.5.6"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
+source-map@^0.5.6, source-map@~0.5.1:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
 strip-ansi@^3.0.0:
   version "3.0.1"
@@ -828,7 +828,7 @@ supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
 
-to-fast-properties@^1.0.1:
+to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"