Primary eng (and PM) emails
Link to “Intent to Deprecate” thread
None. I think sudden removal is ok in this case.
document.createEvent() supports only limited set of events.
However, we support non-standard document.createEvent('WebKitAnimationEvent'). We'd like to remove it.
Remove non-standard feature.
Interoperability and Compatibility Risk
Very low. No other browsers ship this feature now, and usage counter is extremely low.
Edge: Not supported.
Firefox: Not supported.
Safari: Not supported.
Alternative implementation suggestion for web developers
Unprefixed document.createEvent('AnimationEvent') works. However, creating such event doesn't make sense in general.
Usage information from UseCounter
OWP launch tracking bug
Entry on the feature dashboard
Software Engineer, Google