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.
AnimationEffectTimingProperties dictionary, part of the Web Animations API, is used by
KeyframeEffect() to describe timing properties for animation effects. These properties are all optional, although without setting a
duration the animation will not play.
Simply put, these properties describe how the user agent should go about making the transition from from keyframe to keyframe, and how to behave when the animation begins and ends.
- The number of milliseconds to delay the start of the animation. Defaults to 0.
- 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 to
- The number of milliseconds each iteration of the animation takes to complete. Defaults to 0. Although this is technically optional, keep in mind that your animation will not run if this value is 0.
- The rate of the animation's change over time. Accepts the pre-defined values
"ease-in-out", or a custom
"cubic-bezier(0.42, 0, 0.58, 1)". Defaults to
- 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.
- Dictates whether the animation's effects should be reflected by the element(s) prior to playing (
"backwards"), retained after the animation has completed playing (
both. Defaults to
- Describes at what point in the iteration the animation should start. 0.5 would indicate starting halfway through the first iteration for example, and with this value set, an animation with 2 iterations would end halfway through a third iteration. Defaults to 0.0.
- The number of times the animation should repeat. Defaults to
1, and can also take a value of
Infinityto make it repeat for as long as the element exists.
The definition of 'AnimationEffectTimingProperties' in that specification.
|Working Draft||Initial definition|
|Feature||Chrome||Firefox (Gecko)||Microsoft Edge||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||?||45 (45)||?||?||?||?|
|Feature||Android||Android Webview||Firefox Mobile (Gecko)||IE Phone||Opera Mobile||Safari Mobile||Chrome for Android|
|Basic support||?||?||45.0 (45)||?||?||?||?|
 The Web Animations API is only enabled by default in Firefox Developer Edition and Nightly builds. You can enable it in beta and release builds by setting the preference
true, and can disable it in any Firefox version by setting this preference to