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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.
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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.

Modernizr is dual-licensed under the BSD and MIT licenses.

Try it out:

Run the library:

Run the test suite:

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