haxtheweb/issues#1530 start

elements/play-list/.editorconfig

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+# EditorConfig: http://EditorConfig.org
+
+# Top-most EditorConfig file
+root = true
+
+# Rules for JavaScript files:
+
+[*.{js,py,json,sh,html}]
+# 4 space indentation
+indent_style = space
+indent_size = 2
+# No trailing spaces
+trim_trailing_whitespace = true
+# Unix-style newlines
+end_of_line = lf
+# Newline ending every file
+insert_final_newline = true

elements/play-list/.gitignore

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+node_modules
+analysis-error.json

elements/play-list/.npmignore

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+node_modules

elements/play-list/.surgeignore

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+!node_modules/

elements/play-list/.travis.yml

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+language: node_js
+dist: trusty
+sudo: required
+addons:
+  firefox: "latest"
+  apt:
+    sources:
+      - google-chrome
+    packages:
+      - google-chrome-stable
+node_js: stable
+before_install:
+  - npm install -g web-component-tester
+install:
+  - npm install
+before_script:
+script:
+  - xvfb-run npm run test

elements/play-list/LICENSE.md

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elements/play-list/README.md

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+# <play-list>
+
+List
+> scrollable component that accepts lightDom or data driven lists and generates a content player
+
+## Usage
+To use this web component in your project you can utilize one of the following styles of syntax.
+
+```js
+/* In an existing JS module / web component */
+import '@lrnwebcomponents/play-list/play-list.js';
+/* At top of an application with build routine */
+<script type="module" src="@lrnwebcomponents/play-list/play-list.js"></script>
+/* Alternatives for top of application */
+<script type="module">
+  import '@lrnwebcomponents/play-list/play-list.js';
+  // imperative form
+  import {PlayList} from '@lrnwebcomponents/play-list';
+  // if you don't have a build routine and need to reference directly
+  import './node_modules/@lrnwebcomponents/play-list/play-list.js';
+</script>
+// via unpkg CDN (good for testing)
+<script type="module" src="https://unpkg.com/@lrnwebcomponents/play-list/play-list.js"></script>
+```
+
+## Develop / Demo
+Run `yarn start` will start a local development server, open your default browser to display it, open your finder to the correct window and start watching the `/src` directory for changes and automatically rebuilding the element and documentation site for the demo.
+```bash
+yarn start
+```
+
+## Test
+
+```bash
+yarn run test
+```
+
+## Build
+Builds ensure that wcfactory can correctly compile your web component project to
+work on the maximum number of browsers possible.
+```bash
+yarn run build
+```
+
+## Contributing
+
+1. Fork it! `git clone https://github.com/elmsln/lrnwebcomponents.git`
+2. Create your feature branch: `git checkout -b my-new-feature`
+3. Commit your changes: `git commit -m 'Add some feature'`
+4. Push to the branch: `git push origin my-new-feature`
+5. Submit a pull request :D
+
+## Code style
+
+List (and all lrnwebcomponents) use [Prettier][prettier] to auto-format JS and JSON.  The style rules get applied when you commit a change.  If you choose to, you can [integrate your editor][prettier-ed] with Prettier to have the style rules applied on every save.
+
+[prettier]: https://github.com/prettier/prettier/
+[prettier-ed]: https://github.com/prettier/prettier/#editor-integration
+[polyserve]: https://github.com/Polymer/polyserve
+[web-component-tester]: https://github.com/Polymer/web-component-tester
+
+## License
+[ License](http://opensource.org/licenses/)

elements/play-list/custom-elements.json

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+{
+  "version": 1,
+  "tags": [
+    {
+      "name": "play-list",
+      "description": "`play-list`\n`scrollable component that accepts lightDom or data driven lists and generates a content player`\n\n",
+      "attributes": []
+    }
+  ],
+  "globalAttributes": [],
+  "valueSets": []
+}

elements/play-list/demo/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, minimum-scale=1, initial-scale=1, user-scalable=yes">
+    <title>PlayList: play-list Demo</title>
+    <script src="../../../node_modules/@webcomponents/webcomponentsjs/webcomponents-loader.js"></script>
+    <script src="../../../node_modules/@lrnwebcomponents/deduping-fix/deduping-fix.js"></script>
+    <script type="module">
+      import '@polymer/iron-demo-helpers/demo-pages-shared-styles.js';
+      import '@polymer/iron-demo-helpers/demo-snippet.js';
+      import '../play-list.js';
+    </script>
+    <style is="custom-style" include="demo-pages-shared-styles"></style>
+  </head>
+  <body>
+    <div class="vertical-section-container centered">
+      <h3>Basic play-list demo</h3>
+      <demo-snippet>
+        <template>
+          <play-list orientation="vertical"></play-list>
+          <play-list></play-list>
+        </template>
+      </demo-snippet>
+    </div>
+  </body>
+</html>