Intent to Remove: document.createEvent('WebKitAnimationEvent')

[TAMURA, Kent]

Primary eng (and PM) emails

tk...@chromium.org

Link to “Intent to Deprecate” thread

None. I think sudden removal is ok in this case.

Summary

document.createEvent() supports only limited set of events.[1]

However, we support non-standard document.createEvent('WebKitAnimationEvent'). We'd like to remove it.

[1] https://dom.spec.whatwg.org/#dom-document-createevent

Motivation

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

https://www.chromestatus.com/metrics/feature/timeline/popularity/1187

0%.

OWP launch tracking bug

crbug.com/711601

Entry on the feature dashboard

https://www.chromestatus.com/features/5736556333629440

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TAMURA Kent
Software Engineer, Google

[Philip Jägenstedt]

LGTM1, even if we end up keeping the WebKitAnimationEvent alias of AnimationEvent (hope not) there's no reason to keep the document.createEvent bit when not even WebKit supports it any longer.

[Chris Harrelson]

LGTM2

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[Dimitri Glazkov]

LGTM3

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