Window: transitionstart event
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The transitionstart
event is fired when a CSS transition has actually started, i.e., after any transition-delay
has ended.
Bubbles | Yes |
---|---|
Cancelable | No |
Interface | TransitionEvent |
Event handler property | GlobalEventHandlers.ontransitionstart |
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: transitionstart.
Examples
This code adds a listener to the transitionstart
event:
window.addEventListener('transitionstart', () => {
console.log('Started transitioning');
});
The same, but using the ontransitionstart
property instead of addEventListener()
:
window.ontransitionrun = () => {
console.log('Started transitioning');
};
Specifications
Specification |
---|
CSS Transitions Level 2 # transitionstart |
Browser compatibility
BCD tables only load in the browser
See also
- The
GlobalEventHandlers.ontransitionstart
event handler - The
TransitionEvent
interface - CSS properties:
transition
,transition-delay
,transition-duration
,transition-property
,transition-timing-function
- Related events:
transitionend
,transitionrun
,transitioncancel
- This event on
HTMLElement
targets:transitionstart
- This event on
Document
targets:transitionstart