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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<title>X-Tag - Web Components Library</title>
<link rel="icon" type="image/png" href="/v2/images/favicon.png?r2" />
<link href='https://fonts.googleapis.com/css?family=Karla|Overpass' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="/v2/css/global.css" />
<link rel="stylesheet" href="/v2/css/prism.css" />
</head>
<body>
<script src="/v2/js/routing.js"></script>
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<path fill="inherit" d="M110.619,100.911h-72c-4.143,0-7.5,3.357-7.5,7.5c0,4.143,3.357,7.5,7.5,7.5h72 c4.143,0,7.5-3.357,7.5-7.5C118.119,104.268,114.762,100.911,110.619,100.911z"/>
</symbol>
<symbol id="checklist" width="100%" height="1em" viewBox="0 0 100 100">
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<symbol id="open_box" width="100%" height="1em" viewBox="20 20 60 60">
<path d="M19.985 35l30.001-14.986 30.001 14.986-.017 1.981-29.984 15.004-29.989-14.98-.012-2.005z" fill="#EFC75E"/>
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</defs>
</svg>
<header id="site_header">
<h1 class="text-logo"><span><</span><b>X</b><span>></span></h1>
<nav id="global_nav" font="mono">
<input id="global_nav_checkbox" type="checkbox" />
<div>Menu</div>
<a href="/"><svg><use xlink:href="#network"></use></svg>Home</a>
<a href="/docs"><svg><use xlink:href="#docs"></use></svg>Docs</a>
<a href="/builds"><svg><use xlink:href="#package"></use></svg>Builds</a>
<a href="https://github.com/x-tag/core"><svg><use xlink:href="#fork"></use></svg>Fork</a>
</nav>
</header>
<main>
<section id="home_section">
<h2 id="home_logo" data-version=""><div class="text-logo"><span><</span><b>X</b><span>></span></div>
<div id="logo_version">v2.0.3 beta - for v1, click <b><a href="javascript:window.location.href='http://x-tag.github.io/v1'">here</a></b></div>
</h2>
<h2>X-Tag is a
<span font="blue">lightweight, power-packed </span>
<span font="green">Web Components library</span>
that gets you there fast, and stays in its own lane.</h2>
<hr />
<ul class="feature-row">
<li>
<svg viewBox="25 15 465 465">
<rect fill="#fff" x="27.5%" y="21%" width="55%" height="65%"></rect>
<path d="M71.197,46l33.604,377.479L255.474,466l151.725-42.521L440.803,46H71.197z M367.82,169.11H190.905l3.929,47.519h169.058 l-13.137,142.792l-94.236,25.99v0.268h-1.045l-95.029-26.258l-5.775-72.975h45.939l3.41,36.754l51.455,13.914l51.707-13.914 l5.782-59.846H152.312l-12.335-140.176h232.047L367.82,169.11z"></path>
</svg>
<h2 text-shadow>Standard</h2>
<div>Built on Web Components APIs</div>
</li><li>
<svg viewBox="0 0 1024 1024">
<path d="M217.805 1001.83c15.718-50.278 39.424-121.037 71.219-223.334 138.598-21.965 195.942 17.459 283.955-139.725-71.424 21.862-157.542-40.55-152.934-67.635 4.659-27.034 200.346 19.507 328.499-162.458-161.536 35.635-213.197-42.803-192.358-54.63 48.077-27.341 190.771-11.366 266.854-85.453 39.219-38.144 57.6-130.867 41.626-163.942-19.149-39.987-135.987-99.635-200.397-94.003-64.41 5.581-165.427 245.248-195.43 243.405-29.901-1.894-35.994-107.418 16.333-205.466-55.142 24.422-156.211 100.301-187.904 165.171-59.034 120.678 5.53 397.619-15.155 407.45-20.736 9.882-90.419-127.027-111.206-189.133-28.416 95.181-29.082 190.515 53.914 317.133-31.283 83.098-48.384 178.739-50.995 227.379-1.229 38.861 37.069 47.206 43.981 25.242z"></path>
</svg>
<h2 text-shadow>Efficient</h2>
<div>Powerful features in <i style="color: #eee;">3k</i> min/gzip</div>
</li><li>
<svg viewBox="0 0 1024 1024">
<path d="M657.322 15.318l-187.968 187.734-81.302-81.066c-20.458-20.48-53.546-20.48-74.026 0s-20.48 53.546 0 74.026l11.52 11.52-90.88 91.094c-117.334 117.334-141.44 290.368-56.746 427.542l-153.174 153.174c-33.088 33.046-33.088 86.826 0 119.872 33.066 33.088 86.826 33.088 119.658 0l153.194-153.366c137.6 85.334 310.208 60.992 427.734-56.534l90.88-91.094 11.754 11.754c20.458 20.458 53.504 20.458 74.006 0 20.502-20.502 20.502-53.59 0-74.048l-91.968-91.968 198.634-198.614c20.502-20.48 20.502-53.546 0-74.026s-53.546-20.48-74.006 0l-198.634 198.4-192.662-192.426 187.968-187.946c20.502-20.48 20.502-53.546 0-74.026s-53.522-20.482-73.982-0.002z"></path>
</svg>
<h2 text-shadow>Pluggable</h2>
<div>Plays nice with other libraries</div>
</li>
</ul>
<hr/>
<h2>What is X-Tag?</h2>
<p>Originally developed at Mozilla, now supported by devs at Microsoft, X-Tag is an open source JavaScript library that wraps the W3C standard <a href="http://jonrimmer.github.io/are-we-componentized-yet/">Web Components</a> family of APIs
to provide a compact, feature-rich interface for component development. While X-Tag makes it easy to leverage all the Web Components APIs
(Custom Elements, Shadow DOM, Templates, and HTML Imports), it only requires Custom Elements API support to operate.
In the absence of the native Custom Elements APIs, X-Tag uses the same <a target="_blank" href="https://github.com/webcomponents/custom-elements">polyfill</a>
Google's Polymer framework relies on. You can view our package options in the <a href="/builds">Builds</a> section</p>
<hr/>
<x-clock></x-clock>
<pre class="language-javascript"><code>
xtag.create('x-clock', class extends XTagElement {
connectedCallback () {
this.start();
}
start (){
this.update();
this._interval = setInterval(() => this.update(), 1000);
}
stop (){
this._interval = clearInterval(this._data.interval);
}
update (){
this.textContent = new Date().toLocaleTimeString();
}
'tap::event' (){
if (this._interval) this.stop();
else this.start();
}
});
</code></pre>
<hr/>
<h2 text-shadow>Browser Support</h2>
<div id="browser_support" class="feature-row">
<div>
<svg id="browser_edge" width="100%" height="1em" viewBox="0 0 399 432">
<path fill="#ffffff" d="M80.9746094,114.404297 C29.7135331,146.31357 0.416015625,191.658203 0.416015625,191.658203 C0.416015625,191.658203 8.00793654,96.5783329 80.9746094,40.9433594 C109.99433,18.8166636 149.669408,0.278808594 203.032715,0.278808594 C223.079627,0.278808594 265.118164,3.76660156 302.984375,27.1123047 C340.850586,50.4580078 356.149414,70.0136719 373.208984,98.6445312 C380.570259,110.998865 386.565681,126.870142 390.305664,142.179688 C397.312935,170.863811 398.165039,205.168945 398.165039,205.168945 L398.165039,250.359375 L127.542969,250.359375 C127.542969,250.359375 120.933594,341.28125 245.390625,341.28125 C288.675172,341.28125 303.832031,334.481445 318.068359,330.265625 C340.35498,323.665862 361.875,308.955078 361.875,308.955078 L361.916016,399.796875 C361.916016,399.796875 310.980469,431.170898 234.030273,431.170898 C212.360573,431.170898 189.523812,429.353496 167.5,422.208008 C148.255049,415.964103 107.950758,399.1222 80.9746094,359.650391 C71.4321522,345.687758 61.0920706,327.107886 55.9707031,308.955078 C50.4340389,289.330241 50.5019531,270.265226 50.5019531,259.761719 C50.5019531,220.477429 63.9233273,182.970681 87.2128906,155.856445 C117.379883,120.735352 155.509766,105.273438 155.509766,105.273438 C155.509766,105.273438 143.089844,119.75293 135.450195,137.780273 C127.810547,155.807617 125.720703,173.945312 125.720703,173.945312 L278.529468,173.945312 C278.529468,173.945312 287.466797,82.6347656 192.064453,82.6347656 C156.11735,82.6347656 111.967456,95.111701 80.9746094,114.404297 Z"/>
</svg>
Edge
</div><div>
<svg id="browser_chrome" width="100%" height="1em" viewBox="0 0 1024 1024">
<path fill="#ffffff" d="M258.278 446.542l-146.532-253.802c93.818-117.464 238.234-192.74 400.254-192.74 187.432 0 351.31 100.736 440.532 251h-417.77c-7.504-0.65-15.092-1-22.762-1-121.874 0-224.578 83.644-253.722 196.542zM695.306 325h293.46c22.74 57.93 35.234 121.004 35.234 187 0 280.826-226.1 508.804-506.186 511.926l209.394-362.678c29.48-42.378 46.792-93.826 46.792-149.248 0-73.17-30.164-139.42-78.694-187zM326 512c0-102.56 83.44-186 186-186s186 83.44 186 186c0 102.56-83.44 186-186 186s-186-83.44-186-186zM582.182 764.442l-146.578 253.878c-246.532-36.884-435.604-249.516-435.604-506.32 0-91.218 23.884-176.846 65.696-251.024l209.030 362.054c41.868 89.112 132.476 150.97 237.274 150.97 24.3 0 47.836-3.34 70.182-9.558z"></path>
</svg>
Chrome <i>(desktop and mobile)</i>
</div><div>
<svg id="browser_firefox" width="100%" height="1em" viewBox="0 0 1024 1024">
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Opera <i>(desktop and mobile)</i>
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<svg id="browser_android" width="100%" height="1em" viewBox="0 0 24 24">
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Android Browser <i>(OS version 5+)</i>
</div>
</div>
</section>
<section id="builds_section">
<div class="section-intro">
<h2>Install from NPM:</h2>
<p><code>npm install x-tag</code></p>
</div>
<hr />
<div class="section-intro">
<h2>Download the build that works best for you:</h2>
</div>
<menu id="build_features" class="feature-row">
<a file="https://rawgit.com/x-tag/core/master/dist/x-tag-polyfilled.min.js" download="x-tag-polyfilled.min.js">
<svg><use xlink:href="#open_box"></use></svg>
<h2 text-shadow>X-Tag<br/>+<br/>Polyfills<br/></h2>
<div>X-Tag + Custom Elements polyfill</br><i style="color: #eee;">6k min/gzip</i></div>
</a>
<a file="https://rawgit.com/x-tag/core/master/dist/x-tag-raw.min.js" download="x-tag-raw.min.js">
<svg><use xlink:href="#open_box"></use></svg>
<h2 text-shadow>Just X-Tag<br/>•<br/>No Polyfills</h2>
<div>Run it raw on native APIs</br><i style="color: #eee;">3k min/gzip</i></div>
</a>
</menu>
</section>
<section id="docs_section">
<h2 id="getting_started">Getting Started</h2>
<p>
The most important method in the X-Tag library is <code>xtag.create()</code>. The <code>create</code> function on the X-Tag object is what you'll use
to create new custom element definitions, which can include things like lifecycle callbacks, attribute-linked getters/setters (accessors),
and event listeners. Here's what defining a simple custom element looks like with X-Tag:
</p>
<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
constructor (){
alert("It's moving...it's alive!");
}
});
</code></pre>
<p>
Notice the </code>class</code> definition extends the class <code>XTagElement</code>. If you are not extending from a previously defined Custom Element,
you must always extend from the <code>XTagElement</code> class for X-Tag to properly construct your Custom Element definition. The tag name argument (and subsequent automatic
element registration) is optional - here's what it looks like without it, and how to register your element with a tag name separately:
</p>
<pre class="language-javascript"><code>
const Frank = xtag.create(class extends XTagElement {
constructor (){
alert("Muhahaha!");
}
});
xtag.register('x-frankenstein', Frank);
</code></pre>
<hr/>
<h3>A Word on Extensions and Pseudos</h3>
<p>
In the next sections you're going to hear about a few features that are delivered via two different types of modular extensibility systems the
library offers for imbuing your elements with advanced functionality. These two systems are called <code>extensions</code> and <code>pseudos</code>.
Both are different in their intent, scope of effect, range of capabilities. You will use them frequently in your Custom Element class definition
blocks, here's what they look like:
</p>
<pre class="language-javascript"><code>
xtag.create('x-foo', class extends XTagElement {
'alert::foo' (){
}
'count:bar' (){
}
'send::attr:bar:zaz' (){
}
});
</code></pre>
<p>
Notice how the alert method has a <code>::foo</code> attached to it - this is an extension. Extensions are little modules you can created that are called
into service by tagging a property with <code>::</code> + the name of the extension. Extensions are a sizable API of their own that let's you manipulate
far more than just the property they are tagged to. You can only use one extension per property.
</p>
<p>
The other API for adding custom functionality to components is called pseudos, which are seen above in the example property <code>count:bar</code>. When a pseudo is tagged to a property, the pseudo's
own function wraps the target function so that the pseudo is executed first, then the target, which receives its return value. You can chain pseudos, and
they are compiled from left to right so that they left most pseudo function wrapper fires first, passing each function's return value down to the next, until
finally the original target function is executed. You can see what this looks like in the above example property <code>send::foo:bar:zaz</code>.
<p>
</p>
There are separate guides for extensions and pseudos that talk about how to create and use your own, but for now just be aware that they are one of
the primary means the X-Tag library delivers its own features.
</p>
<hr/>
<h3>Content is King</h3>
<p>
Many of the components you create will require child elements for structure and presentation. X-Tag includes a content templating
<code>extension</code> that makes this quick and easy. Simply add a <code>::template</code> function to your component definition
and return a string or ES6 Template String. In the example below, notice the <code>true</code> parameter being passed to the extension.
This tells the template extension to render the content immediately when an instance is created. If you don't want a template to render
automatically like this, don't pass anything to it.
</p>
<pre class="language-javascript"><code>
xtag.create('x-frankenstein', class extends XTagElement {
name (){ return 'Frankenstein'; }
'::template(true)' (){
return `<h2>I am ${this.name()}</h2>
<span>I was created by a mad scientist</span>`
}
});
</code></pre>
<h4>Manual Rendering of Templates</h4>
<p>
If you elect not to have your template automatically rendered when your component instances are created, you'll need to manually trigger render.
</p>
<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
name (){ return 'Frankenstein'; }
'::template' (){
return `<h2>I am ${this.name()}</h2>
<span>I was created by a mad scientist</span>`
}
});
const FrankNode = new Frank();
FrankNode.render();
</code></pre>
<h4>Multiple Templates</h4>
<p>
The template extension can be used multiple times within the same class definition block, which allows you to specify different templates
for use in the same component. The templates are cached and reference based on the property name you put in front of the <code>::template</code> extension
token. To render your templates, simply pass the name of the template you want to use to the <code>render</code> function, as in the following example:
</p>
<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
'foo::template(true)' (){
return `<h2>My name is Frankenstein</h2>
<span>I work for a mad scientist</span>`
}
'bar::template' (){
return `<h2>My friends call me Frank</h2>
<span>I work for a mad scientist</span>`
}
});
const FrankNode = new Frank();
// Because the foo template indicated it was to be automatically rendered, its content is already present in your element instance.
FrankNode.render('bar');
// Calling the render function with the bar template name swaps out the current foo template content with the bar content.
</code></pre>
<hr/>
<h3>Say Hello to Custom Attribute Accessors</h3>
<p>
Accessors are custom attributes linking to a corresponding pair of setters/getters, and X-Tag has a built-in extension that makes adding accessors to
your custom element definition stupid simple. To use this extension, add an <code>::attr</code> modifier to one of your class definition properties.
This tells X-Tag to wire up a getter/setter to an HTML attribute of the same name. When attributes are linked to a getter/setter their gets, sets, and
state changes will be synced without having to write any additional code.
</p>
<p>
You can also tell the accessor extension that type of accessor you are creating, and it will help by sanitizing values and modifying the gets/sets to
match the behavior of the type you declare. I
<pre class="language-javascript"><code>
xtag.create('x-foo', class extends XTagElement {
set 'maxVolume::attr' (value){
// X-Tag automatically maps camel cased getter/setter names to their
// dashed attribute equivalents. In this example, the `maxVolume`
// getter/setter pair maps to the `max-volume` attribute.
}
});
xtag.create('x-bar', class extends XTagElement {
'::template(true)' (){ return '<input />' }
set 'disabled::attr(boolean)' (value){
// The ::attr extended property links node.disabled to gets/sets of
// the disabled="" attribute. Because it is declared as a boolean,
// all values passed into its getter/setter will be a Boolean.
this.firstElementChild.disabled = value;
}
});
</code></pre>
<hr/>
<h3>The DL on Events</h3>
<p>
X-Tag provides a powerful event system you'll use often in developing your components.
We'll cover the basics here, and leave the more advanced features for a special tutorial dedicated to the topic.
</p>
<p>
To add event listeners to your component (either native or custom events), you'll be using the <code>event</code> extension. To do so, add a property to your
Custom Element definition that matches the name of the event you want to listen for, plus the <code>::event</code> extension flag. When your class definition
is processed by X-Tag's create method, the <code>event</code> extension will remove the property, add a listener using the supplied property name with the
function you supplied as the handler.
</p>
<pre class="language-javascript"><code>
xtag.register('x-foo', {
'click::event': function(){
// attaches a click listener that calls this function when
// the user clicks an element inside the custom element
},
'focus::event': function(){
// attaches a focus listener that calls this function when
// something inside your custom element is focused.
}
});
</code></pre>
<hr/>
<h3>Gettin' Jedi with Pseudos</h3>
<p>
One advanced feature of X-Tag you should be aware of right off the bat is the <code>delegate</code> pseudo.
X-Tag features a function modifier system called <code>pseudos</code> which allows you to seamlessly wrap
functions anywhere in your custom element defintion object (lifecycle callbacks, methods, accessors, and events)
to extend their functionality. The <code>delegate</code> pseudo enables you to quickly add event delegation
(filtering of event targets based on CSS expressions) to any event function you add to your component. Here's an example:</p>
<pre class="language-javascript"><code>
xtag.register('x-foo', {
content: '<input/>',
events: {
'tap:delegate(input)': function(){
// Perform an action only when the user taps on an
// <input/> element within your component.
}
}
});
</code></pre>
<h4>Create your own Pseudo:</h4>
<p>
Once you create a pseudo and add it to the main xtag.pseudos object, as show below,
you can then use it on any key of your custom element definition objects that has a
function as its value.
</p>
<pre class="language-javascript"><code>
xtag.pseudos.foo = {
onParse: function(ctor, property, args, fn){
/*
Parse is called when the pseudos specified in a declaration are being
compiled and wrapped around the function they are being applied to.
ctor: the Custom Element Class definition
property: property the pseudo is being applied to (ex: ping:foo, property = ping)
args: arguments from the pseudo definition (ex: prop:foo(1, 2), args = [1, 2])
fn: the function the pseudo is wrapping in the pseud chain
*/
},
onInvoke: function(node, obj){
/*
Invoke is called any time the pseudo-wrapped function is called. This is where
you perform whatever action you desire on the node or object the pseudo targets.
node: the element
obj: object composed of these properties: { fn: fn, args: args, detail: detail }
*/
}
};
</code></pre>
<hr/>
<h3>Inheritance</h3>
<p>
X-Tag uses the standard Custom Elements mechanism for inheritance: ES6 class extension. The return value of the <code>create</code> method is an X-Tag compiled ES6 class, which
can be itself extended either via generic ES6 class declaration, or by again passing it into <code>create</code>, if you wanted to add additional features to your new extended class
using X-Tag APIs.
</p>
<pre class="language-javascript"><code>
const Foo = xtag.create('x-foo', class extends XTagElement {
set 'foo::attr' (){ /* Handle foo attribute change */ }
});
Bar extends Foo {
bar (){ }
}
const Zaz = xtag.create('x-zaz', class extends Bar {
'click::event' (){ /* do something when clicked */ }
});
</code></pre>
<hr/>
<h2>API Reference</h2>
<h3 id="api_xtag_create">xtag.create(TAG_NAME, DEFINITION)</h3>
<p>
Create and (optionally) register a Custom Element definition for use as a new tag in HTML markup or via DOM APIS.
</p>
<table>
<tr>
<th>Argument</th>
<th>Type</th>
<th>Description</th>
</tr>
<tr>
<td>TAG_NAME</br>(optional)</td>
<td>String</td>
<td>
The tag name you want to use when using your Custom Element <i>(must contain a dash)</i>. When
this argument is passed, the Custom Element definition is automatically added to the document's Custom Element registry.
</td>
</tr>
<tr>
<td>DEFINITION</td>
<td>Class</td>
<td>The class definition block for your Custom Element</td>
</tr>
</table>
<pre class="language-javascript"><code>
const Frank = xtag.create('x-frankenstein', class extends XTagElement {
constructor (){
alert("It's moving...it's alive!");
}
});
</code></pre>
<hr />
<h3 id="api_xtag_addevent">xtag.addEvent(ELEMENT, TYPE, HANDLER, CAPTURE)</h3>
<p>
Add a native, custom, or X-Tag library event listener to an element. The TYPE field also
accepts pseudo chains for even more powerful event handling.
</p>
<table>
<tr>
<th>Argument</th>
<th>Type</th>
<th>Description</th>
</tr>
<tr>
<td>ELEMENT</td>
<td>DOM element reference</td>
<td>
The element you would like to attach an event listener to.
</td>
</tr>
<tr>
<td>TYPE</td>
<td>String</td>
<td>
The event name, with any event pseudos you may want to chain.
</td>
</tr>
<tr>
<td>HANDLER</td>
<td>Function</td>
<td>
The event handler you want called when the event occurs.
</td>
</tr>
<tr>
<td>CAPTURE</td>
<td>Function</td>
<td>
Boolean argument you can pass if you want the event to use capturing vs bubbling.
</td>
</tr>
</table>
<pre class="language-javascript"><code>
xtag.addEvent(myElement, 'tap:delegate(img)', function(event){
alert('An image element within myElement was just tapped');
});
</code></pre>
<hr />
<h3 id="api_xtag_addevents">xtag.addEvents(ELEMENT, OBJECT)</h3>
<p>
Add multiple native, custom, or X-Tag library event listeners to an element using one function.
Pseudo chains are avaliable for use in your event object keys.
</p>
<table>
<tr>
<th>Argument</th>
<th>Type</th>
<th>Description</th>
</tr>
<tr>
<td>ELEMENT</td>
<td>DOM element reference</td>
<td>
The element you would like to attach the event listeners to.
</td>
</tr>
<tr>
<td>OBJECT</td>
<td>Object</td>
<td>
An object composed of multiple events - keys are event names, and values are the event handlers.
</td>
</tr>
</table>
<pre class="language-javascript"><code>
xtag.addEvents(myElement, {
'tap': function(event){
alert('myElement was just tapped');
},
'keypress:keypass(13)': function(event){
alert('The enter key was pressed, all other keys are blocked');
}
});
</code></pre>
<h3 id="api_xtag_fireevent">xtag.fireEvent(ELEMENT, NAME, OPTIONS)</h3>
<p>
Add a native, custom, or X-Tag library event listener to an element. The TYPE field also
accepts pseudo chains for even more powerful event handling.
</p>
<table>
<tr>
<th>Argument</th>
<th>Type</th>
<th>Description</th>
</tr>
<tr>
<td>ELEMENT</td>
<td>DOM element reference</td>
<td>
The element you would like to attach an event listener to.
</td>
</tr>
<tr>
<td>NAME</td>
<td>String</td>
<td>
The event name you wish to fire on the target element.
</td>
</tr>
<tr>
<td>OPTIONS</td>
<td>Object</td>
<td>
The event options you want to use in firing your event. These include:
<ul bulleted>
<li><code>detail</code> allows passage of custom data via the detail property of the event</li>
<li><code>bubbles</code> specify whether the event bubbles - defaults to true</li>
<li><code>cancelable</code> specify whether the event is cancelable - defaults to true</li>
</ul>
</td>
</tr>
</table>
<pre class="language-javascript"><code>
xtag.fireEvent(myElement, 'show', {
detail: {
x: 123,
y: 456
}
});
</code></pre>
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