[Webkit-unassigned] [Bug 188189] Perform a microtask checkpoint before creating a custom element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188189

--- Comment #4 from Domenic Denicola <d at domenic.me> ---
The upgrade case is subtle.

https://html.spec.whatwg.org/multipage/custom-elements.html#concept-upgrade-an-element step 8.1 ->
https://heycam.github.io/webidl/#construct-a-callback-function ->
https://html.spec.whatwg.org/multipage/webappapis.html#clean-up-after-running-script ->
https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint (if the stack is empty at that time, i.e. if the UA is calling it)

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