jquery request animation frame example

gistfile1.js

if ( t() && jQuery.timers.push(t) && !timerId ) {
	// Use requestAnimationFrame instead of setInterval if available
	if ( requestAnimationFrame ) {
		timerId = true;
		raf = function() {
			// When timerId gets set to null at any point, this stops
			if ( timerId ) {
				requestAnimationFrame( raf );
				fx.tick();
			}
		};
		requestAnimationFrame( raf );
	} else {
		timerId = setInterval( fx.tick, fx.interval );
	}
}