Sandbox::https://github.com/selectgithub/engine/blob/bindbuffer/src/polyfill/request-animation-frame.js

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// http://paulirish.com/2011/requestanimationframe-for-smart-animating/

// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

(function() {

var lastTime = 0;

var vendors = ['ms', 'moz', 'webkit', 'o'];

for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {

window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];

window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']

|| window[vendors[x]+'CancelRequestAnimationFrame'];

}

if (!window.requestAnimationFrame)

window.requestAnimationFrame = function(callback, element) {

var currTime = new Date().getTime();

var timeToCall = Math.max(0, 16 - (currTime - lastTime));

var id = window.setTimeout(function() { callback(currTime + timeToCall); },

timeToCall);

lastTime = currTime + timeToCall;

return id;

};

if (!window.cancelAnimationFrame)

window.cancelAnimationFrame = function(id) {

clearTimeout(id);

};

}());