Webshims Lib - The polyfilling, capability based loading JavaScript Library

Features

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/track implementation
interactive elements: summary/details
JSON (stringify and parse)
localStorage/sessionStorage
geolocation
ECMAScript 5 / JavaScript 1.8.5 features

How To Use

Simply download Webshims Lib and put the js-webshim-folder in your project
Include the JavaScript:

<script src="js/jquery.js"></script>
// Simple change
<script src="js-webshim/minified/extras/modernizr-custom.js"></script> 
// 'Use your own' variant
<script src="js/Modernizr-custom.js"></script> 

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

<script> 
	//load and implement all unsupported features 
	$.webshims.polyfill();
	
	//or only load a specific feature
	//$.webshims.polyfill('geolocation json-storage');
</script>

Wait till everything has been loaded and then use it:

<script> 
	$(function(){
		//work with JSON and localStorage 
		var userData = JSON.parse(localStorage.getItem('userData')) || {visits: 0};
		$('#visits').html(userData.visits);
		//...
	});
</script>

More information and demos here.

License

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

Questions?

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 1.9.5

improve youtube playback with jarisplayer
fix position bug of error messages in nested overflow: scroll boxes
fix chrome issue with dynamically created required radio buttons
favorize custom validation message before vendor validation message

Release 1.9.4

improved rtmp handling for both Jaris and JW player
fixed bug on iOS in conjunction with input[type=date]
fixed creditcard validation
allow placeholder for type=number
show mediaelement fallback, if flash isn't installed and mediaelements aren't supported
a lot of improvements to the free and open source swf media player Jaris (we will switch to Jaris by default with next release)

Release 1.9.3

add option to use alternative jarisplayer as mediaelement fallback
fixed track[default] in IE10 (initial copying of track.mode)
implement .prop-checked in browsers, which do not support the :checked selector
implement .user-error selector
limit track.kind property using addTextTrack to only known values

Release 1.9.2

implemented input[type="time"]
allow dynamically changing label/kind/srclang of existing track elements
added removeCue to texttrack API
added screenreader-support for track[kind="descriptions"]
improved change events for input[type=range] and spinbutton controls (input[type=number])

Release 1.9.1

added onaddtrack/onremovetrack events to TextTrackList interface
datalist polyfill is now default for forms feature
added swedish locale (thx to @leon)
improved errorbubble style
updated JW player

devspacenine/webshim