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

> The default focus ring is drawn for all the `activeElement` in every shadow tree/document. If a shadow host that delegates focus has a focused element within its shadow tree, the focus ring is drawn for both the focused element in the shadow tree and the host.

It seems like that should be spec'ed somewhere then. It doesn't look like the current CSS selectors language allows that for now.

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