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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Shadom DOM and HTML template 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>This is a shadowed H1</h1>
</template> 
    
  Beware, this example that shows CSS encapsulation, will not work if your browser does not support natively the Shadow DOM and HTML templates. The Polyfill does not emulate this feature!<p>
  The CSS in the template, that says that all H1s should be white on red, does not affect the H1 that is in the body of the document.
  <h1 id="withShadowDom">This is sdfsdfsfda text header</h1>
  
  <h1>Normal header with no shadow DOM associated.</h1>
</body>
</html>
​
 
// Instanciate the template
var t = document.querySelector('#mytemplate');
​
// Create a root node under our H1 title
var host = document.querySelector('#withShadowDom');
​
const shadowRoot = host.attachShadow({mode: 'open'});
  
// insert something into the shadow DOM, this will be rendered
shadowRoot.appendChild(document.importNode(t.content, true));
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