Re: [w3c/webcomponents] Integrate callback invocation with IDL (#186)

> Presumably these operations are (will be, more likely, if ever) defined as running these as part of some kind of task. So perhaps the microtask checkpoint also needs to run element callbacks if they haven't been run yet?

It's not that simple. You need to push an element queue on when the operation starts, and pop it when it stops. I guess we could push one on at the start of every task, and pop at the end? @dglazkov, @esprehn, do you know how Blink handles this with regard to editing operations?

> As for the rest, IDL needs to be changed to account for this. Whether we enumerate the places for which it matters or leave that up to implementations is less important, but it seems that if everyone needs to do that work anyway, it might help if we did it for everyone.

Why, and how, would we change IDL if we don't enumerate the places that need the extended attribute? Do you have thoughts about how to handle reflection, and how to handle the things that don't have a spec?

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