Specify MouseEvent in select event.button check

[josepharhar]

This event.button check was added to make sure that right clicking a select doesn't open its picker, but since the same algorithm handles keyboard events it should be specific about looking at event.button only on mouse events.

• At least two implementers are interested (and none opposed):
  • Chromium
  • …
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chromium: Already implemented
  • Gecko: …
  • WebKit: …
• Corresponding HTML AAM & ARIA in HTML issues & PRs: not needed
• MDN issue is filed: not needed
• The top of this comment includes a clear commit message to use.

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

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/form-elements.html ( diff )