Currently, the prefixed onwebkit{animation,transition}XX handlers are only available on the Window object in Chrome. By the spec[0], these should be on GlobalEventHandlers[1] - i.e. available on HTMLElement, Document, and Window. Note that although standardized, these event handlers are still obsolete - web developers should use the non-prefixed versions instead! [0]: [1]:


This fix brings us into line with the spec, Gecko, and WebKit.



Established standard

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 81
  • Chrome for Android release 81
  • Android WebView release 81

Consensus & Standardization

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


Last updated on 2020-11-09