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

> @miketaylr I think that's only the case because you didn't add a listener inside the shadow tree.

Yeah, you're right. Updated https://miketaylr.com/bzla/global-event-shadow-script.html and the results are a bit confusing (possibly due to devtools bugs?...). 

In Chrome, nothing gets logged except the `console.group` names, but in Safari `event.target.tagName` and `e.target.tagName` are `SPAN`, which means it leaked.

So we should probably set `window.event` to undefined when traversing across shadow boundaries (or something like that).

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