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The window.requestAnimationFrame() method tells the browser that you wish to perform an animation and requests that the browser call a specified function to update an animation before the next repaint. The method takes a callback as an argument to be invoked before the repaint.

Note: Your callback routine must itself call requestAnimationFrame() if you want to animate another frame at the next repaint.

You should call this method whenever you're ready to update your animation onscreen. This will request that your animation function be called before the browser performs the next repaint. The number of callbacks is usually 60 times per second, but will generally match the display refresh rate in most web browsers as per W3C recommendation. requestAnimationFrame() calls are paused in most browsers when running in background tabs or hidden <iframe>s in order to improve performance and battery life.

The callback method is passed a single argument, a DOMHighResTimeStamp, which indicates the current time when callbacks queued by requestAnimationFrame() begin to fire. Multiple callbacks in a single frame, therefore, each receive the same timestamp even though time has passed during the computation of every previous callback's workload. This timestamp is a decimal number, in milliseconds, but with a minimal precision of 1ms (1000 µs).

Syntax

window.requestAnimationFrame(callback);

Parameters

callback
A parameter specifying a function to call when it's time to update your animation for the next repaint. The callback has one single argument, a DOMHighResTimeStamp, which indicates the current time (the time returned from performance.now() ) for when requestAnimationFrame() starts to fire callbacks.

Return value

A long integer value, the request id, that uniquely identifies the entry in the callback list. This is a non-zero value, but you may not make any other assumptions about its value. You can pass this value to window.cancelAnimationFrame() to cancel the refresh callback request.

Example

var start = null;
var element = document.getElementById('SomeElementYouWantToAnimate');
element.style.position = 'absolute';

function step(timestamp) {
  if (!start) start = timestamp;
  var progress = timestamp - start;
  element.style.left = Math.min(progress / 10, 200) + 'px';
  if (progress < 2000) {
    window.requestAnimationFrame(step);
  }
}

window.requestAnimationFrame(step);

Specification

Specification Status Comment
HTML Living Standard
The definition of 'requestAnimationFrame' in that specification.
Living Standard No change, supersedes the previous one.
Timing control for script-based animations
The definition of 'requestAnimationFrame' in that specification.
Obsolete Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

24

10 webkit

Yes

231

11 — 42 moz 2

4 — 11 moz 3

10

15

Yes o

6.1

6 webkit

Return value23 Yes1110156.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes

25

18 webkit

Yes

23

14 — 42 moz

15

7.1

6.1 webkit

?
Return value Yes25 Yes14156.1 ?

1. Callback parameter is a DOMHighResTimestamp. This means ten microsecond precision and zero time as performace.now().

2. Callback parameter is a DOMTimestamp. This means millisecond precision and zero time as Date.now().

3. Could be called with no input parameters.

See also