The CSS Transitions specification specifies that transition events are sent when a transition is enqueued, starts, ends, or is canceled as transitionrun, transitionstart, transitionend, and transitioncancel respectively. These events mirror the CSS animation events which allow developers to observe CSS animations.


Specification link

Final published standard: Recommendation, Living Standard, Candidate Recommendation, or similar final form

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Shipped/Shipping
  • Shipped/Shipping
  • No signals


Last updated on 2021-12-13