AnimationEffectTimingReadOnly.fill

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

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

See also

• Web Animations API
• AnimationEffectReadOnly.timing returns a AnimationEffectTimingReadOnly object...
• ...while AnimationEffect.timing returns a mutable AnimationEffectTiming object.
• CSS's animation-fill-mode