The website of Ura Design

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// requestAnimationFrame
// Offload animation repainting to browser for optimized performance.
// http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/RequestAnimationFrame/Overview.html
// By Addy Osmani
Modernizr.addTest('raf', !!Modernizr.prefixed('requestAnimationFrame', window));