Document: transitionrun event

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

The transitionrun event is fired when a CSS transition is first created, i.e. before any transition-delay has begun.

Bubbles Yes
Cancelable No
Interface TransitionEvent
Event handler property ontransitionrun

The original target for this event is the Element that had the transition applied. You can listen for this event on the Window interface to handle it in the capture or bubbling phases. For full details on this event please see the page on HTMLElement: transitionrun.

Examples

This code adds a listener to the transitionrun event:

document.addEventListener('transitionrun', () => {
  console.log('Transition is running but hasn't necessarily started transitioning yet');
});

The same, but using the ontransitionrun property instead of addEventListener():

document.ontransitionrun = () => {
  console.log('Transition started running');
};

See a live example of this event.

Specifications

Specification Status Comment
CSS Transitions Level 2
The definition of 'transitionstart' in that specification.
Editor's Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
transitionrun eventChrome No support NoEdge ? Firefox Full support 53IE ? Opera ? Safari ? WebView Android No support NoChrome Android No support NoFirefox Android Full support 53Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

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