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

My perspective:

- (2) is less likely to be web-compatible than (1), but the visible changes are so small compared to today's intersection semantics, I very much doubt it would cause problems. (Basically, people would have to be reading back the value of `e.returnValue` and expecting a string, not just a truthy value.)
- (3) seems a bit more dangerous.
- (2) or (3) require many more changes in browsers to achieve than (1).

So on balance probably (1) is going to be the way to go, even if it's significantly less nice.

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