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Webshims Lib is a modular capability-based polyfill-loading library


The polyfilling, capability based loading JavaScript Library

General Principles

  • HTML5 compliant: correctly and accurately implemented (HTML5) Markup-, JS- and DOM-APIs
  • capability based loading: extremely lightweight in modern browsers
  • cross-browser support: All A-Graded browsers including latest version of Opera are tested
  • extendable: if we have not implemented a feature you want, you can easily implement it on your own


  • HTML5 shiv and innerShiv solution including basic CSS-support
  • canvas
  • HTML5 form features including: constraint validation and form widgets (input[type="range"], input[type="date"], input[type="number"], input[type="time"], input[type="month"], output, progress, input[list]/datalist)
  • HTML5 audio/video/track implementation
  • interactive elements: summary/details
  • filereader
  • geolocation
  • ECMAScript 5 / JavaScript 1.8.5 features

Installation and Usage

1 - Download the Webshim Lib and put the js-webshim-folder in your project.

2 - Include the JavaScript:

<script src="js/jquery.js"></script>

<!-- 'Use your own' variant -->
<script src="js/Modernizr-custom.js"></script> 

<script src="js-webshim/minified/polyfiller.js"></script> 

    // load and implement all unsupported features 

    // or only load a specific feature
    //webshims.polyfill('forms es5');

3 - Wait till everything has been loaded and then use it:

        // work with the HTML5 API
            $(this).after( $.prop(this, 'validationMessage') );
        // ...

More information and demos.


The Webshims Lib core is licensed under the MIT-License.

Webshims Lib uses many great third party scripts:

Script License URL
flashcanvas MIT
flashcanvaspro closed
Jaris FLV GPL 3.0
excanvas Apache License 2.0
filereader MIT
es5 MIT
swfmini MIT
track BSD 2 clause
color-picker MIT
forms-picker MIT
jme.woff GPL / CC BY 3.0


If you have any questions, please feel free to ask them on

Please tag your questions with 'webshim'.

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