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

> 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.

@annevk so far my tests show that nothing leaking from the shadow tree (which maybe isn't obvious given the way I wrote them), in both instances `event.target` and `window.event` point to the light dom wrapper node (or whatever the right term is).

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