Use DOM manipulation task source for firing popover toggle event

[sideshowbarker]

• At least two implementers are interested (and none opposed):
  • The existing Blink and WebKit implementations already use the DOM
    manipulation task source
• Tests are written and can be reviewed and commented upon at:
  • Not readily observable from WPT tests
• Implementation bugs are filed:
  • The shipping Blink and WebKit implementations already use the DOM
    manipulation task source; Gecko hasn’t shipped an implementation yet
• MDN issue is filed: …
  • No docs impact

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

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/popover.html ( diff )