[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 #8 from Andrea Giammarchi <andrea.giammarchi at gmail.com> ---
(In reply to Ryosuke Niwa from comment #5)
> (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?

The polyfill was fixed within the same day so you're seeing the already fixed version. Change the polyfill version to its previous patch and see an error is thrown.

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