Re: [whatwg/dom] Define mutation events (#305)

I have a couple of concerns given the existence of the "reverse origin trial":

- It's not transparent which websites continue to be able to use mutation events in Chromium. This makes it much harder for other browsers to remove mutation events before May 2025. E.g., while WebKit in theory could lean on `Quirks.cpp` without knowledge of what to fill it with it'd turn into a game of whack-a-mole. Also, Chromium has extended those deprecation deadlines in the past (e.g., with locking SharedArrayBuffer behind COOP+COEP, that might still be ongoing?).
- Meanwhile Chromium passes the relevant WPT tests as WPT is not registered for the various reverse origin trials. And other browsers might get blame for not passing them as casual onlookers won't be aware of the various mechanisms in place.

I don't really have a good idea of how to handle this, but I'm going to reopen this for now to keep track of this.

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