transitionstart

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The transitionstart event is fired when a CSS transition has started.

General info

Interface

TransitionEvent

Bubbles

Yes

Cancelable

No

Target

document, element

Default Action

None

Properties

Property	Type	Description
target Read only	EventTarget	The event target (the topmost target in the DOM tree).
type Read only	DOMString	The type of event.
bubbles Read only	Boolean	Whether the event normally bubbles or not
cancelable Read only	Boolean	Whether the event is cancellable or not?
propertyNameRead only	DOMString	The name of the CSS property associated with the transition.
elapsedTimeRead only	Float	The amount of time the transition has been running, in seconds, when this event fired. Note that this value is not affected by the value of transition-delay.
pseudoElementRead only	DOMString	The name (beginning with two colons) of the CSS pseudo-element on which the transition occured (in which case the target of the event is that pseudo-element's corresponding element), or the empty string if the transition occurred on an element (which means the target of the event is that element).

Specifications

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

Browser compatibility

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	?	?	10	?	?

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	?	?	?	?

See also

• The TransitionEvent interface
• transitionend, transitioncancel
• CSS properties: transition, transition-delay, transition-duration, transition-property, transition-timing-function.