AnimationEffectTimingReadOnly.fill

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 fill property of AnimationEffectTimingReadOnly dictates how and when the animation's effects should be reflected by the element(s) visual state.

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

Syntax

// Getting the delay in milliseconds
var animationDelay = animation.effect.timing.fill;

// Setting the delay in milliseconds 
animation.effect.timing.fill = 'both';

Value

A DOMString representing the fill type to be applied. It can take one of the following values (defaults to none):

none
The animation's effects are only visible while the animation is iterating or its playhead is positioned over an iteration. The animation's effects are not visible when its playState is pending with a delay, when its playState is finished, or during its endDelay or  delay.
forwards
The animation's effects should be retained after the animation has completed playing, in spite of and during any endDelay or when its playState is finished.
backwards
The animation's effects should be reflected by the element(s) state prior to playing, in spite of and during any delay and pending playState.
both
Combining the effects of both forwards and backwards: The animation's effects should be reflected by the element(s) state prior to playing and retained after the animation has completed playing, in spite of and during any endDelay, delay and/or pending or finished playState.

Examples

In the Growing and Shrinking Alice example, the cake has an animation that shows it getting eaten up:

var nommingCake = document.getElementById('eat-me_sprite').animate(
 [
   { transform: 'translateY(0)' },
   { transform: 'translateY(-80%)' }   
 ], {
   fill: 'forwards',
   easing: 'steps(4, end)',
   duration: aliceChange.effect.timing.duration / 2
 });
 nommingCake.pause();

Because the animate() method takes an array of timing properties and values to create an AnimationEffectTiming object behind the scenes, we could also write the above like so (in fact, go ahead and try it in the CodePen):

var nommingCake = document.getElementById('eat-me_sprite').animate(
[
  { transform: 'translateY(0)' },
  { transform: 'translateY(-80%)' }   
], aliceChange.effect.timing.duration / 2);
nommingCake.pause();

nommingCake.effect.timing.fill = 'forwards';
nommingCake.effect.timing.easing = 'steps(4, end)';

Specifications

Specification Status Comment
Web Animations
The definition of 'AnimationEffectTimingReadOnly.fill' 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

Document Tags and Contributors

 Contributors to this page: rachelnabors, chrisdavidmills
 Last updated by: rachelnabors,