Rename HTMLOrSVGElement mixin

[bkardell]

Renames relatively recent HTMLOrSVGElement IDL mixin to HTMLOrForeignElement in order to reflect its wider use in MathML as well, which previously was just Element. This is referenced in the new interface defined in MathML-Core and aimed at resolving this historical oddity.

• At least two implementers are interested (and none opposed):
  • new MathMLElement which uses this mixin is shipping in Firefox already
  • new MathMLElement patches landed in webkit on 9/6/2019
  • supportive comments from blink owner in https://github.com/mathml-refresh/mathml/issues/83, upstreaming in https://bugs.chromium.org/p/chromium/issues/detail?id=6606#c89
• Tests are written and can be reviewed and commented upon at:
  • https://wpt.fyi/interop/mathml/relations/html5-tree/clipboard-event-handlers.tentative.html?label=master&label=experimental
  • https://wpt.fyi/results/mathml/relations/html5-tree/css-inline-style-interface.tentative.html?label=master&label=experimental
  • https://wpt.fyi/results/mathml/relations/html5-tree/html-or-foreign-element-interfaces.tentative.html?label=master&label=experimental
  • https://wpt.fyi/results/mathml/relations/html5-tree/math-global-event-handlers.tentative.html?label=master&label=experimental
• Implementation bugs are filed:
  • Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=835571
  • Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1571487
  • Safari: https://bugs.webkit.org/show_bug.cgi?id=200470

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

[domenic]

This seems to modify a review draft, and the commit message is an attempt to publish a new review draft? Please modify source instead.

[bkardell]

Lol, oh noes... I was so caught up in it I missed this somehow.. ok, let me close and resubmit the right thing this time. Apologies.

[domenic]

For future reference, you can also just push commits to the same branch, and it'll stay part of the PR.