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Important note: Webshim is not compatible with upcoming jQuery 3.x and I do not plan to work on a new major version. I will still fix critical bugs in the future though.

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


  • 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
  • matchMedia
  • interactive elements: summary/details
  • XHR2 / filereader (including, XHR2/AJAX CORS and FormData handling)
  • picture / img[srcset]
  • promise
  • geolocation
  • ECMAScript 5 / JavaScript 1.8.5 features
  • window.URL
  • getUserMedia ('usermedia' currently only access to user's camera, not microphone)
  • sticky (position: sticky)

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>

<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.

Download via bower

bower install webshim --save-dev


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
moxie GPL 3.0
es5 MIT
swfmini MIT
track BSD 2 clause
color-picker MIT
forms-picker MIT
jme.woff GPL / CC BY 3.0
picture MIT
url any (OSI approved) Open Source licence


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

Please tag your questions with 'webshim'.