Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Feature detect HTML5 and CSS3 features, with handy css and javascript hooks so you can progressively enhance to your heart's content.
Pull request Compare This branch is 1544 commits behind Modernizr:master.
Fetching latest commit...
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


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

Modernizr tests which native CSS3 and HTML5 features are available in the current UA and makes the results available to you in two ways: as properties on a global Modernizr object, and as classes on the <html> element. This information allows you to progressively enhance your pages with a granular level of control over the experience.

Modernizr has an optional (not included) conditional resource loader called Modernizr.load(), based on Yepnope.js ( To get a build that includes Modernizr.load(), as well as choosing which tests to include, go to

Full documentation on

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

Try it out:

Run the test suite:

Something went wrong with that request. Please try again.