Request Animation Frame polyfill

rAF.js

var fps = 1000 / 60,

	rAF = window.requestAnimationFrame ||
		window.webkitRequestAnimationFrame ||
		window.mozRequestAnimationFrame ||
		window.msRequestAnimationFrame ||
		window.oRequestAnimationFrame ||
		function (callback) {
			window.setTimeout(callback, fps);
		};