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.


Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 74
  • Chrome for Android release 74
  • Android WebView release 74

Consensus & Standardization

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

  • Shipped/Shipping
  • Shipped/Shipping
  • Shipped/Shipping
  • No signals


Last updated on 2020-11-19