requestanimationframe.js

// 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));