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

Oh, I misunderstood your earlier comment / #308 then. So styling a slot is like any other element and the UA stylesheet in particular should contain `slot { display: contents; }` (i.e. no box is generated by default but `display` *can* be overridden)?

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https://github.com/w3c/webcomponents/issues/358#issuecomment-179569997