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

Hmm. I guess I forgot that there are two separate pieces of weirdness: manually setting the `returnValue`, and handling the return value of an `onbeforeunload` event handler. @miketaylr is mostly talking about the former, whereas my post and the recent changes were mostly about the latter.

Now that I remember that, it seems like moving `returnValue` into the base `Event` class is not as churn-ful as I thought it would be, so I am less concerned.

But still we should try to outline a concrete proposal (i.e.: what spec lines change) and see what browsers currently depart from it and whether they'd be willing to change.

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