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

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Webshims Lib - The polyfilling, capability based loading JavaScript Libary


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

Implemented Features:

  • HTML5 shiv and innerShiv solution including basic CSS-support
  • canvas
  • HTML5 form features including: constraint validation and form widgets (input[range], input[date], input[time], input[datetime-local], output, input[list]/datalist)
  • HTML5 audio/video implementation
  • interactive elements: summary/details
  • JSON (stringify and parse)
  • localStorage/sessionStorage
  • geolocation
  • ECMAScript 5 / JavaScript 1.8.5 features

How To Use

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

    //load and implement all unsupported features 

    //or only load a specific feature
    //$.webshims.polyfill('geolocation json-storage');

  • Wait till everything has been loaded and then use it:

        //work with JSON and localStorage 
        var userData = JSON.parse(localStorage.getItem('userData')) || {visits: 0};

More information and demos here.


The Webshims Lib core is licensed under the MIT-License. Note: Webshims Lib uses many great third party scripts.


If you have any questions, please feel free to ask them on the Using jQuery Plugins forum.

Please tag your questions with 'webshims' or 'polyfill'.

Release 1.8.3

  • chrome/webkit fixes
  • full compatibility with jQuery 1.7
  • added locales for errormessages (If you want to improve existing messages or add some errormessages, please send me a pull request or file an issue)
  • improved progress event for older Safari mobile and Firefox

Release 1.8.2

  • improved mediaelement (canplaythrough event, http live streaming for iOS)
  • moved input[list]/datalist support from 'forms' to 'forms-ext' feature (more lightweight for Chrome/Safari)
  • improved styleability of errorbubble
  • compatibility with jQuery 1.7 (1.8.1 is not compatible with jQuery 1.7)

Release 1.8.1

  • improved mediaelement loading
  • fixed small bugs in mediaelement polyfill
  • prepare for jQuery 1.7 compatibility
  • fixed demos

Release 1.8.0

  • first mediaelement implementation (audio/video)
  • implemented form submitter attributes (formaction, formtarget, formenctype)
  • better language support
  • updated es5-shim
  • updated jQuery UI path
  • fixed label for putput element
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