Re: [whatwg/dom] MutationObserver invocation order (#713)

Does this mean that if the `id` callback first enqueued a promise callback that would also run before the `title` callback? I.e., this is an issue even without `slotchange`? It seems like yes.

@pmdartus willing to add a test for that?

@smaug---- do you agree that fixing this would require changing step 2 of https://dom.spec.whatwg.org/#notify-mutation-observers to only include mutation observers whose record queue is not empty in _notifyList_?

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