Duration

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 duration property of the Web Animations API represents the duration in milliseconds to complete a single iteration of the animation.

Note: Element.animate(), KeyframeEffectReadOnly.KeyframeEffectReadOnly(), and KeyframeEffect.KeyframeEffect() all accept an object of timing properties including duration. The value of duration corresponds directly to AnimationEffectTimingReadOnly.duration in timing objects returned by AnimationEffectReadOnly, KeyframeEffectReadOnly, and KeyframeEffect.

Syntax

// how long each loop should last
var timingProperties = {
  duration: 250
}

Value

The number of milliseconds each iteration of the animation takes to complete. Defaults to 0.

Note: In this level of this specification, the string value auto is equivalent to 0. This is a forwards-compatiblity measure since a future level of this specification will introduce group effects where the auto value expands to include the duration of the child effects.

Examples

In the Pool of Tears example, each tear is passed a random duration via its timing object:

// Randomizer function
var getRandomMsRange = function(min, max) {
  return Math.random() * (max - min) + min;
}

// Loop through each tear
tears.forEach(function(el) { 

  // Animate each tear
  el.animate(
    tearsFalling, 
    {
       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)"
    });
});

Specifications

Specification	Status	Comment
Web Animations The definition of 'duration' in that specification.	Working Draft	Editor's draft.

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

Duration

Syntax

Value

Examples

Specifications

Browser compatibility

See also

Document Tags and Contributors