[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 #4 from Ryosuke Niwa <rniwa at webkit.org> ---
(In reply to comment #3)
> Removing the `z-index: -1` in my jsbin does do the trick for TP, but I'm
> curious why just changing the tag name to <div> also fixes it: 
> 
> http://jsbin.com/sabayuyila/edit?html,output
> 
> That should make no difference, but it does. 
> 
> It's also confusing that the inspector doesn't render a shadow root:
> http://prntscr.com/be57v6. Happy to file another but on that if you think
> it's an issue.

That version doesn't have z-index: -1.  I've tested this manny times so I'm pretty certain there is no behavioral difference between div and better-button in this example.

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