Spec the prefixed CSS Animation/Transition event handlers

[stephenmcgruer]

See whatwg/compat#118

Tests: web-platform-tests/wpt#19099 (will need moved from compat to appropriate parts of the html spec).

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/webappapis.html ( diff )

[stephenmcgruer]

@domenic @annevk PTAL. Reminder: we had previous conversations in whatwg/compat#119 :)

[domenic]

Normative content seems good, just some editorial stuff...

[domenic]

Looks great. Will leave for a bit in case @annevk wants to take a look; otherwise will merge tomorrow.

[domenic]

Note that via the IDL sync this will automatically generate tests for GlobalEventHandlers in https://github.com/web-platform-tests/wpt/blob/master/html/webappapis/scripting/events/event-handler-all-global-events.html.

@stephenmcgruer can you comment back on this issue with the bug URLs for each browser?

[stephenmcgruer]

@domenic Sorry, what bug URLs are you referring to?

[annevk]

@stephenmcgruer bugs you filed against browsers, such as https://bugzilla.mozilla.org/show_bug.cgi?id=1607918 against Firefox. We typically list those in specification PRs for people doing spelunking.

[stephenmcgruer]

Ack. Here are the related bugs from this spec PR change:

Chrome:

• onwebkit{animation,transition}XX event handlers should be defined in Element too - fixed as of Jan 14th

Firefox:

• Firefox incorrectly allows lower-case 'webkitanimationend' event listener - fixed as of Jan 13th

Safari:

• onwebkit{animation, transition}XX handlers missing from Document - opened Jan 13th