[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

Rune Lillesveen <rune at opera.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rune at opera.com

--- Comment #7 from Rune Lillesveen <rune at opera.com> ---
(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.

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