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 AnimationEffectTimingReadOnly interface of the Web Animations API is comprised of timing properties.
This object is returned by the timing attribute of a KeyframeEffectReadOnly and AnimationEffectReadOnly interfaces. 
While this object is read-only, it is inherited by the mutable AnimationEffectTiming interface associated with KeyframeEffect.
Properties
- AnimationEffectTimingReadOnly.delayRead only
- The number of milliseconds to delay the start of the animation. Defaults to 0.
- AnimationEffectTimingReadOnly.directionRead only
- Whether the animation runs forwards (normal), backwards (reverse), switches direction after each iteration (alternate), or runs backwards and switches direction after each iteration (alternate-reverse). Defaults tonormal.
- AnimationEffectTimingReadOnly.durationRead only
- The number of milliseconds each iteration of the animation takes to complete. Defaults to 0.
- AnimationEffectTimingReadOnly.easingRead only
- The rate of the animation's change over time. Accepts the pre-defined values linear,ease,ease-in,ease-out, andease-in-out, or a custom cubic-bezier value likecubic-bezier(0.42, 0, 0.58, 1). Defaults tolinear.
- AnimationEffectTimingReadOnly.endDelayRead only
- The number of milliseconds to delay after the end of an animation. This is primarily of use when sequencing animations based on the end time of another animation. Defaults to 0.
- AnimationEffectTimingReadOnly.fillRead only
- Dictates whether the animation's effects should be reflected by the element(s) state prior to playing (backwards), retained after the animation has completed playing (forwards), orboth. Defaults tonone.
- AnimationEffectTimingReadOnly.iterationStartRead only
- A number representing which repetition the animation begins at and its progress through it.
- AnimationEffectTimingReadOnly.iterationsRead only
- The number of times the animation should repeat. Defaults to 1, and can also take a value of infinity to make it repeat infinitely.
Specifications
| Specification | Status | Comment | 
|---|---|---|
| Web Animations The definition of 'AnimationEffectTimingReadOnly' in that specification. | Working Draft | Editor's draft. | 
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) | 
|---|---|---|---|---|---|
| Basic support | No support | No support | No support | No support | 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 | No support | No support | No support | No support | No support |