Re: [whatwg/dom] window.event and shadow trees (#679)

Ah, now I see that we're afraid of a leak through event.{target,srcElement,currentTarget,...}.

As I'm newbie about shadow trees, I don't yet understand how much the encapsulation is important.  However, if we suppose that the encapsulation is very important, I'd think that hiding `window.event.target` is more important.  Detection of existence of shadow trees seems less impactful/harmful than exposure of shadow DOM nodes.

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