requestAnimationFrame для оптимизации анимации в браузере

Это замена обычной покадровой отрисовки по setTimeout.

Пример:

(function() {
  var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||
                              window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
  window.requestAnimationFrame = requestAnimationFrame;
})();
 
var start = window.mozAnimationStartTime;  // Only supported in FF. Other browsers can use something like Date.now().
 
function step(timestamp) {
  var progress = timestamp - start;
  d.style.left = Math.min(progress/10, 200) + "px";
  if (progress < 2000) {
    requestAnimationFrame(step);
  }
}
 
requestAnimationFrame(step);

(function() {

var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame ||

window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;

window.requestAnimationFrame = requestAnimationFrame;

})();

var start = window.mozAnimationStartTime; // Only supported in FF. Other browsers can use something like Date.now().

function step(timestamp) {

var progress = timestamp - start;

d.style.left = Math.min(progress/10, 200) + "px";

if (progress < 2000) {

requestAnimationFrame(step);

}

requestAnimationFrame(step);

Polyfill:

var requestAnimationFrame = window.requestAnimationFrame
	|| window.webkitRequestAnimationFrame
	|| window.mozRequestAnimationFrame
	|| window.oRequestAnimationFrame
	|| window.msRequestAnimationFrame
	|| function (callback) {
	return window.setTimeout(callback, 1000 / 60);
};

var requestAnimationFrame = window.requestAnimationFrame

|| window.webkitRequestAnimationFrame

|| window.mozRequestAnimationFrame

|| window.oRequestAnimationFrame

|| window.msRequestAnimationFrame

|| function (callback) {

return window.setTimeout(callback, 1000 / 60);

};

https://developer.mozilla.org/en-US/docs/DOM/window.requestAnimationFrame,
http://habrahabr.ru/post/114358/
http://www.xiper.net/collect/js-plugins/overclock-site/programm-animation.html (пример перевода анимации с setTimeout)

requestAnimationFrame для оптимизации анимации в браузере

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