Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

@miketaylr when explicitly leaking the event object outside the shadow tree it's reasonable for things to leak. The problem is that if you just call a global function from the event listener even though it doesn't have access to the event normally, it will have access to `window.event`, which is a problem of sorts. I suggest we basically don't set `window.event` when the event target is inside a shadow tree. That should be compatible enough since shadow trees are a new feature.

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