This is a sandbox to test the original requestAnimationFrame Polyfill as proposed by @paulirish. Mainly targeting Webkit 533.1 in order to gain some form of rendering framerate control on android 2 devices.

requestAnimationFrame Polyfill (the "original")

// 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

(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 = Date.now();
			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);
		};
}());

Changelog:

• replaced new Date().getTime() with Date.now() (significantly faster)