Re: [whatwg/dom] Add delegatesFocus init to attachShadow and flag to ShadowRoot (#768)

> These seem to be largely user-agent defined, according to the CSSWG. https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo. Any changes would probably be done there, but I'm unsure what changes we would make, given how much leeway that document gives user agents. Perhaps we could add another bullet point to the non-normative suggestions?

I think we need to at least decide what happens if UA can decide to make it obvious that a shadow host has the focus even if the focus had been delegated to its shadow tree's content. Or would we follow the normal convention so that the focus ring is only drawn in the inner most element with the actual focus?

> > What does the first focusable area mean when focusing a shadow host with delegatesFocus set to true? Does it consider any elements that are focusable during sequential navigation? e.g. anchors vs. buttons.
>
> This is the subject of great discussion in whatwg/html#4796 (comment) and w3c/webcomponents#830 . Complicated :(. As I stated in the PR it might be best to merge with a big red box pointing to the open issue.

I don't think we should this or that PR until we figure out which element gets the focus delegated given that's this feature is all about. As things stand, I can't really implement / land this feature in WebKit because the behavior is not well defined.

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