[Webkit-unassigned] [Bug 158550] Cannot attach Shadow root to unregistered custom element name

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158550

--- Comment #8 from Ryosuke Niwa <rniwa at webkit.org> ---
(In reply to comment #7)
> (In reply to comment #2)
> > Created attachment 280877 [details]
> > Reduction
> > 
> > It looks like this is an artifact of "contain: content".  That's somehow
> > forcing the background color to be painted behind content with a negative
> > z-index.
> 
> contain:content, which includes paint containment, establishes a new
> stacking context as per
> https://drafts.csswg.org/css-containment/#paint-containment which makes the
> positioned descendant with negative z-index paint of top of the outer
> element's background.

Ah, okay so this was really a bug in the content that relied on that behavior in browsers that don't support contain: content.

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