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Feature detect HTML5 and CSS3 features, with handy css and javascript hooks so you can progressively enhance to your heart's content.
JavaScript
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README.txt
modernizr.js
output.html

README.txt

Modernizr: a JavaScript library allowing you to use CSS3 & HTML5 
           while maintaining control over unsupported browsers 

Modernizr is a script that will detect native CSS3 and HTML5 features
available in the current UA and provide an object containing all
features with a true/false value, depending on whether the UA has
native support for it or not.

In addition to that, Modernizr will add classes to the <html>
element of the page, one for each cutting-edge feature. If the UA
supports it, a class like "cssgradients" will be added. If not,
the class name will be "no-cssgradients". This allows for simple
if-conditionals in CSS styling, making it easily to have fine
control over the look and feel of your website.

http://www.modernizr.com

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