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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Custom element example</title>
  <!-- polyfill for web components -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/2.0.2/webcomponents-bundle.js"></script>
  </head>
<body>
  
<template id="mytemplate">
  <style>
    h1 {
      color:white;
      background:red;
    }
    </style>
    <h1>
       <slot name="my-title">My default text</slot>    
    </h1>
    <p>
       <slot name="my-paragraph">My default text</slot
    </p>
</template>
​
  <my-widget>
       <span slot="my-title">Title injected</span>
       <span slot="my-paragraph">Paragraph injected</span>
  </my-widget>
</body>
​
​
 
// TIP : use "document.currentScript" here to select
// the "local document", the one corresponding to this page.
// this may avoid problems when multiple WebComponents files
// are inserted in the same document. See below...
var localDoc = document.currentScript.ownerDocument;
​
class MyWidget extends HTMLElement {
  constructor() {
    super();
    const shadowRoot = this.attachShadow({mode: 'open'});
      
    // instanciate template
    let t = localDoc.querySelector('#mytemplate');
    // add it to the shadow DOM
      
    shadowRoot.appendChild(document.importNode(t.content, true));
  }
}
​
try {
  // Define the custom element to the browser
  customElements.define('my-widget', MyWidget);
  console.log("Element defined");
} catch (error) {
  console.log(error);
}
​
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