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HTML Import Webcomponents Polyfill Not Working In Firefox

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I am trying webcomponents in a sample app. Since some of the specs are not included in some browsers, i tried using polyfill for those. In Mozilla firefox, i tried by enabling the

Solution 1:

To use, in Firefox, Custom Elements v1 with HTML Imports:

  1. Do not activate Firefox flags as the implementation is outdated.
  2. Install webcomponentsjs (with bower for example), and include in your main file only htmlimports.min.js file.
  3. Install custom-elements (from your link) and include in your main file custom-elements.min.js.

You main page should look like this:

<head>
   <script src="htmlimports.min.js"></script>
   <script src="custom-elements.min.js"></script>
   <link rel="import" href="your-components.html">
</head>
<body>
    <your-component></your-component>

NB: for step 3, you can also use document-register-element.

You cannot use Custom Elements v1 class syntax with Internet Explorer directly because class is not implemented. You'll need first to transform the source code with a transpiler like Babel.

Alternately, use a modern version (Edge), or use the prototype syntax.


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