Remove <marquee> events

[domenic]

They were only supported by one engine (Gecko).

Closes #2957.

• At least two implementers are interested (and none opposed):
  • Chromium does not implement these events
  • WebKit does not implement these events
• Tests are written and can be reviewed and commented upon at:
  • Test the removal of <marquee> events web-platform-tests/wpt#27395
• Implementation bugs are filed:
  • Chrome: N/A
  • Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1689705
  • Safari: N/A

(See WHATWG Working Mode: Changes for more details.)

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/obsolete.html ( diff )