This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The direction property of the AnimationEffectTimingReadOnly dictionary object represents the direction of the animation's playback along its timeline and its behavior after completing each iteration.

Note: In AnimationEffectTiming, a mutable subclass of AnimationEffectTimingReadOnly used withKeyframeEffects, the property acts as both a getter and a setter.


// Getting the direction of the animation
var animationPlaybackDirection = animation.effect.timing.direction;

// Setting the direction of the animation
animation.effect.timing.direction = reverse;


A DOMString representing the direction of the animation's playback. It can take one of the following values (defaults to normal):

The animation runs forwards, from beginning to end, in the way we experience the flow of time.
The animation runs backwards, or "rewinds."
The animation switches direction after each iteration, going from forwards to backwards then back again every two iterations.
The reverse of the above: the animation switches direction after each iteration, going from backwards to forwards then back again every two iterations.


In the Red Queen's Race example, we can inspect the Red Queen and Alice's animation to discover a production secret:

// Returns "reverse" because the sprite was created upside down!
return redQueen_alice.effect.timing.direction;


Specification Status Comment
Web Animations
The definition of 'AnimationEffectTimingReadOnly.direction' in that specification.
Working Draft Editor's draft.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes) 48 (48) No support (Yes) No support
Feature Android Android Webview Chrome for Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? No support No support No support

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

Animation AnimationEffectTimingReadOnly API direction Experimental Property Reference waapi web animations api