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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Animation.playState property of the Web Animations API returns and sets an enumerated value describing the playback state of an animation.

This property is read-only for CSS Animations and Transitions.


var currentPlayState = Animation.playState;

Animation.playState = newState;


The current time of the animation is unresolved and there are no pending tasks.
The animation is waiting on some pending task to complete.
The animation is running.
The animation was suspended and the Animation.currentTime property is not updating.
The animation has reached one of its boundaries and the Animation.currentTime property is not updating.


In the Growing/Shrinking Alice Game example, players can get an ending with Alice crying into a pool of tears. In the game, for performance reasons, the tears should only be animating when they're visible. So they must be paused as soon as they are animated like so:

// Setting up the tear animations

tears.forEach(function(el) {  
      delay: getRandomMsRange(-1000, 1000), // randomized for each tear
      duration: getRandomMsRange(2000, 6000), // randomized for each tear
      iterations: Infinity,
      easing: "cubic-bezier(0.6, 0.04, 0.98, 0.335)"
  el.playState = 'paused';

// Play the tears falling when the ending needs to be shown. 

tears.forEach(function(el) { 
  el.playState = 'running'; 

// Reset the crying tears animations and pause them.

tears.forEach(function(el) {  
  el.playState = "paused";
  el.currentTime = 0;


Specification Status Comment
Web Animations
The definition of 'playState' in that specification.
Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 39.0 [1] 48 (48)[2] No support No support No support
Feature Android Android Webview Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 39.0 [1] 39.0 [1] 48.0 (48)[2] No support No support No support

[1] Before Chrome 50, this attribute showed idle for an animation that had not yet started. Starting with Chrome 50, it shows paused.

[2] 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 dom.animations-api.core.enabled to true, and can disable it in any Firefox version by setting this preference to false.

See also

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