Web/API/EffectTiming/iterations

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

The Web Animations API dictionary EffectTiming's iterations property specifies the number of times the animation should repeat. The default value is 1, indicating that it should only play once, but you can set it to any floating-point value (including positive Infinity defaults to 1, and can also take a value of Infinity to make it loop infinitely.

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

Syntax

var timingProperties = {
  iterations: numberOfIterations
};

timingProperties.iterations = numberOfIterations;

Value

A floating-point value specifying the number of times the animation sequence will play through. Any value from 0 (don't play the animation at all) to positive Infinity (run the animation indefinitely) is supported. Defaults to 1, meaning the animation sequence plays through once then stops automatically.

Exceptions

TypeError: An attempt was made to set the value of this property to a negative number or NaN. The property's value is left unchanged.

Examples

In the Forgotten Key example, Alice waves her arm up and down the entire time the page is open by passing Infinity as the value for her iterations property:

// Get Alice's arm, and wave it up and down
document.getElementById("alice_arm").animate([ 
  { transform: 'rotate(10deg)' }, 
  { transform: 'rotate(-40deg)' }
], {
  easing: 'steps(2, end)',
  iterations: Infinity,
  direction: 'alternate',
  duration: 600
});

Specifications

Specification	Status	Comment
Web AnimationsThe definition of 'iterations' 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
`iterations` 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.