This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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 TransitionEvent.initTransitionEvent() method Initializes a transition event created using the deprecated Document.createEvent("TransitionEvent") method.

TransitionEvent created that way are untrusted.

Note: this method has been dropped during the standard process. It has been deprecated and is in the progress of been removed from most implementation. Do not use it anymore, use the standard constructor, TransitionEvent(), to create a synthetic TransitionEvent


transitionEvent.initTransitionEvent(typeArg, canBubbleArg, cancelableArg, transitionNameArg, elapsedTimeArg);


Is a DOMString identifying the specific type of transition event that occurred. The following value is allowed:
Value Meaning
transitionend The transition completed.
Is a Boolean flag indicating if the event can bubble (true) or not (false).
Is a Boolean flag indicating if the event associated action can be avoided (true) or not (false).
Is a DOMString containing the name of the CSS property associated with the transition. This value is not affected by the transition-delay property.
Is float giving the amount of time the transition has been running, in seconds, when this event fired.


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

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
initTransitionEvent() (Yes) (Yes) 6.0 (6.0)
Removed in 23.0 (23.0)
10.0 (Yes) (Yes)
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
initTransitionEvent() (Yes) (Yes) 6.0 (6.0)
Removed in 23.0 (23.0)
10.0 (Yes) (Yes)

See also

Document Tags and Contributors

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