Re: [w3c/webcomponents] Need "slotchange" event (#288)

@rniwa it would help if you could elaborate a bit. I have explained how using mutation records could work and could be kept consistent with the mutation records we have today. Thanks to the `takeRecords()` feature it seems also the only approach that could explain synchronous layout features (apart from something that works exactly like it, but isn't mutation observers, of course).

I've also explained how using animation frame timing does not fit with shadow DOM since it does not work for arbitrary node trees. I've explained how using normal tasks is problematic.

I could come up with a description for a microtask-timed event, but it seems that would end up being very similar to mutation observers and not have the `takeRecords()` benefit, unless we add that on top.

I'm happy to try attend a teleconference if one is scheduled, but I don't see why we can't continue to have this conversation here.

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