Re: [webcomponents] [Shadow] activeElement behavior seems to break encapsulation (#358)

Hmm, without `Node.isFocused`, if we don't allow slot to be an active element,
we can know the real focused element by `document.activeElement` and recursive
`host->shadowRoot.activeElement`.

I don't still understand what's the point of allowing a slot to be an active element.
@rniwa, why it's a good idea?

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