code: function _Browser_rAF()
  {
  	return __Scheduler_binding(function(callback)
  	{
  		var id = requestAnimationFrame(function() {
  			callback(__Scheduler_succeed(Date.now()));
  		});
  
  		return function() {
  			cancelAnimationFrame(id);
  		};
  	});
  }
docs: ANIMATION FRAMES