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

The TransitionEvent() constructor returns a newly created TransitionEvent, representing an event in relation with an transition.


transitionEvent = new TransitionEvent(type, {propertyName: aPropertyName, 
                                             elapsedTime  : aFloat, 
                                             pseudoElement: aPseudoElementName});


The TransitionEvent() constructor also inherits arguments from Event().


Is a DOMString representing the name of the type of the TransitionEvent. It is case-sensitive and can only be: 'transitionend'.

propertyName Optional
Is a DOMString containing the value of the property-name CSS property associated with the transition. It defaults to "".
elapsedTime Optional
Is float giving the amount of time the animation has been running, in seconds, when this event 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). It defaults to 0.0.
pseudoElement Optional
Is a DOMString, starting with "::", containing the name of the pseudo-element the animation runs on. If the animation doesn't run on a pseudo-element but on the element, an empty string: "". It defaults to "".


Specification Status Comment
CSS Transitions
The definition of 'TransitionEvent()' in that specification.
Working Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
TransitionEvent() constructor
Chrome Full support 27Edge Full support 79Firefox Full support 23IE No support NoOpera Full support YesSafari No support NoWebView Android Full support YesChrome Android Full support 27Firefox Android Full support 23Opera Android Full support YesSafari iOS No support NoSamsung Internet Android Full support 2.0


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

See also