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

Implemented Features:

  • 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"], 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 1.8.11/1.8.12

  • updated to Modernizr 2.6.1/html5shiv 3.6.0
  • fixed Samsung's datepicker implementation
  • updated jQuery UI
  • basic support for jQuery 1.8.0
  • improved implementation of excanvas
  • switch default canvas implementation from excanvas to flashcanvas (because it is so much better)
  • fixed :focus implementation in jQuery 1.6+

Release 1.8.10

  • fixed validity issues with old webkits (Safari 5.0.0 - 5.0.2)
  • improved object/flash reframe handling for mediaelement
  • improved spinbutton usability
  • auto disable html5shiv's innerShiv, if jQuery 1.7+ is used
  • fixed input/change event for input widgets on iOS5
  • improved :required/:valid/:invalid pseudoselectos
  • added possibility for custom styleable datalists (in capable browsers)
  • added test for custom styleable input[type="range"]
  • temporarily removed support for time and datetime-local widgets

Release 1.8.9

  • updated to Modernizr 2.5.3 (fixes crash bug in IE8)
  • improved field[placeholder] usability
  • fixed regression for iOS4 (old webkits)
  • updated email validation