IterationStart

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 iterationStart property of the Web Animations API represents which repetition the animation begins at and its progress through it.

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

Syntax

// Set the animation to start on its second iteration
var timingProperties = {
  iterationStart = 1
}

Value

A whole number or decimal greater than or equal to 0.

Note: This number represents the iteration index at which the animation effect begins and its progress through that iteration. All animations' iteration indexes start at 0. Therefor a value of 0.5 would start the animation half way through its first iteration or loop. Meanwhile, a value of 1.2 indicates the animation begins 20% of the way through its second iteration.

Specifications

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

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	(Yes)	(Yes)	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

IterationStart

Syntax

Value

Specifications

Browser compatibility

See also

Document Tags and Contributors