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.
The difference is transitionstart
and transitionrun
is that transitionrun
fires when the transition is created (i.e. at the start of any delay) and transitionstart
fires when the actual animation has begun (i.e. at the end of any delay).
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 Document
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:
document.addEventListener('transitionstart', () => { console.log('Started transitioning'); });
The same, but using the ontransitionstart
property instead of addEventListener()
:
document.ontransitionrun = () => { console.log('Started transitioning'); };
See a live example of this event.
Specifications
Specification | Status | Comment |
---|---|---|
CSS Transitions The definition of 'transitionstart' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
transitionstart event | Chrome No support No | Edge No support No | Firefox Full support 53 | IE ? | Opera ? | Safari
Full support
13.1
| WebView Android No support No | Chrome Android No support No | Firefox Android Full support 53 | Opera Android ? | Safari iOS
Full support
13.4
| Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- User must explicitly enable this feature.
- User must explicitly enable this feature.
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
Window
targets:transitionstart