Re: [w3c/webcomponents] Shadow DOM and the Fullscreen API (#180)

Well, we DO want `:fullscreen` to match the host if the rule appears outside the shadow tree.  Imagine that we had `custom-video` element, which allows an element within its shadow tree to be full screen upon request.  Then you'd want to allow users of this component to style element when it's full screen.  For that to work, the user needs to be able to target the host when the element inside the shadow tree enters full screen.

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