Animation Effect Timing Properties

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.

Element.animate(), KeyframeEffectReadOnly.KeyframeEffectReadOnly(), and KeyframeEffect.KeyframeEffect() all accept a dictionary object containing the following timing properties. These properties are all optional, although without setting a duration the animation will not play.


var timingProperties = {
  delay: 1000,
  direction: "alternate",
  duration: 3000,
  easing: "ease-in",
  endDelay: 100, 
  fill: "both",
  iterationStart: 1.5, 
  iterations: Infinity


AnimationEffectTimingProperties.delay Optional
The number of milliseconds to delay the start of the animation. Defaults to 0.
AnimationEffectTimingProperties.direction Optional
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 normal.
AnimationEffectTimingProperties.duration Optional
The number of milliseconds each iteration of the animation takes to complete. Defaults to 0.
AnimationEffectTimingProperties.easing Optional
The rate of the animation's change over time. Accepts the pre-defined values linearease, ease-in, ease-out, and ease-in-out, or a custom cubic-bezier value like cubic-bezier(0.42, 0, 0.58, 1). Defaults to linear.
AnimationEffectTimingProperties.endDelay Optional
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
AnimationEffectTimingProperties.fill Optional
Dictates whether the animation's effects should be reflected by the element(s) prior to playing (backwards), retained after the animation has completed playing (forwards), or both. Defaults to none.
AnimationEffectTimingProperties.iterationStart Optional
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.
AnimationEffectTimingProperties.iterations Optional
The number of times the animation should repeat. Defaults to 1, and can also take a value of infinity to make it repeat infinitely.


Specification Status Comment
Web Animations
The definition of 'Animation Effect Timing Properties Dictionary' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support ?
? ?


Feature Android Android Webview Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support ? ? ? ? ? ? ?

See also


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

animate() Animation Animation Timing Properties AnimationEffectTimingProperties API Experimental KeyframeEffect() KeyframeEffectReadOnly() Reference waapi web animations api