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

Remember that a slot is now always a focusable element, given that it does not generate CSS Box in default. We should honor that the return value from DocumetnOrShadowRoot.activeElement is a focusable element.

Please give us a concrete proposal how activeElement should be if a slot does not generate CSS BOX.

In addition that,
https://github.com/w3c/webcomponents/issues/358#issuecomment-178476050
>  In the meantime, if any element in a shadow tree gets focused (from outside the shadow tree), its shadow host should get focus event rather than the event bubbling is scoped at its shadow root.

What about this?  Please give us a concrete proposal how ':focus' or 'focus event' works.


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