Move onwebkit{animation,transition}XX handlers to GlobalEventHandlers

Category: JavaScript
Type: New or changed feature
Status: Enabled by default (Chrome 81)
Intent stage: Start prototyping

Summary

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]: https://html.spec.whatwg.org/multipage/webappa [1]: https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers

Motivation

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

Standards & signals

Specification: https://html.spec.whatwg.org/multipage/webappapis.html#idl-definitions
Firefox: Shipped/Shipping
Safari: Shipped/Shipping — Safari incorrectly specs the handlers on Window and Element rather than GlobalEventHandlers; this means they are missing Document.
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=999895

Docs: N/A

Explainers: N/A

View on chromestatus.com