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?).

This is a very good point. There are some sites using the origin trial, though not a ton. But I agree it might be the best to simply wait for the end of the OT before turning off mutation events in other browsers, to be safe.

I've been very actively trying to manage the usage of mutation events coming up to this removal, and I'll continue to do that afterwards for the origin trial registrants. E.g. I'll be sending reminder emails to all registrants that the OT is coming to a close, and warning that we won't be extending it for anything other than very dire circumstances. But you're right that there's a chance we need to extend the deadline.

Perhaps for now, the answer is "do nothing", and I'll check back in here toward the first quarter of Q1 with an update?

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