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

> 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?

In many UI components, it's important to know whether something inside the component is focused or not.  e.g. toolbar-pane component may need to style itself differently when a text field inside is focused.

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