[w3c/webcomponents] tabIndex -1 behaves differently on non-Custom Elements (#774)

An inconsistency in Shadow DOM v1 has started to confuse web developers:

>From [crbug.com/906729](https://crbug.com/906729):
> ... it seems that there is a spec bug now. tabindex -1 behaves differently on a non-Custom Element (like a \<div\>) than it does on a Custom Element.

**Custom Element:** tabIndex -1 removes "tab focusability" for everything inside the custom element.
**A [scrollable] \<div\>:** tabIndex -1 removes "tab focusability" for the [scrollable] \<div\> itself but not its content.


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