[Webkit-unassigned] [Bug 258282] REGRESSION (STP 172): Broke custom element built-in polyfill by making form properties non deletable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258282

--- Comment #5 from Ryosuke Niwa <rniwa at webkit.org> ---
(In reply to Andrea Giammarchi from comment #3)
> Polyfill author here. I am not sure if it's a regression or an intended
> behavior but the form gets an own `0` property which I believe is the button
> within the form (I can't test as I'm on WebKit non TP)
> 
> Live example here: https://codepen.io/bakura10/pen/mdQERdX

When I open this URL in STP172, I see "CONNECTED" in console and there is no other error emitted. What exactly is the symptom I should be looking for?

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