This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.


The AnimationEvent.initAnimationEvent() method Initializes an animation event created using the deprecated Document.createEvent("AnimationEvent") method.

AnimationEvent created this way are untrusted.

Note: During the standardization process, this method was removed from the specification. It has been deprecated and is in the progress of being removed from most implementations. Do not use this method; instead, use the standard constructor, AnimationEvent(), to create a synthetic AnimationEvent.


animationEvent.initAnimationEvent(typeArg, canBubbleArg, cancelableArg, animationNameArg, elapsedTimeArg);


A DOMString identifying the specific type of animation event that occurred. The following values are allowed:
Value Meaning
animationstart The animation has started.
animationend The animation completed.
animationiteration The current iteration just completed.
A Boolean flag indicating if the event can bubble (true) or not (false).
A Boolean flag indicating if the event associated action can be avoided (true) or not (false).
A DOMString containing the value of the animation-name CSS property associated with the transition.
A float indicating the amount of time the animation has been running, in seconds, as of the time the event was fired, excluding any time the animation was paused. For an "animationstart" event, elapsedTime is 0.0 unless there was a negative value for animation-delay, in which case the event will be fired with elapsedTime containing  (-1 * delay).


This method is non-standard and not part of any specification, though it was present in early drafts of CSS Animations.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Chrome Full support 1Edge No support 12 — 16Firefox No support 6 — 23IE Full support 10Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support 43Edge Mobile ? Firefox Android No support 6 — 23Opera Android Full support YesSafari iOS ? Samsung Internet Android Full support 4.0


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.

See also

Document Tags and Contributors

Contributors to this page: fscholz, erikadoyle, teoli, Sheppy, tregagnon
Last updated by: fscholz,