Web/API/EffectTiming/duration

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

The duration property of the dictionary EffectTiming in the Web Animations API specifies the duration in milliseconds that a single iteration (from beginning to end) the animation should take to complete.

Element.animate(), KeyframeEffectReadOnly(), and 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

var timingProperties = {
  duration: durationInMilliseconds | "auto"
};

timingProperties.duration = durationInMilliseconds | "auto";

Value

The number of milliseconds long a single beginning-to-end iteration of the animation should take. The default is "auto". This value must not be negative; otherwise, it can have any value (including positive infinity).

Currently, a value of "auto" is the same as specifying 0.0. This is a forwards-compatiblity measure since in the future, "auto" will be expanded to take into account the duration of any child effects. Consider using "auto" rather than 0 if that makes sense.

Exceptions

TypeError: The specified value is either a string other than "auto", a number less than zero, NaN, or some other type of object entirely.

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 AnimationsThe definition of 'duration' in that specification.	Working Draft	Editor's draft.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`duration` Experimental'	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 63	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support 52	Chrome Android Full support 52	Firefox Android Full support 63	Opera Android No support No	Safari iOS No support No	Samsung Internet Android Full support 6.0

Legend

Full support: Full support
No support: No support
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.