[w3ctag/design-reviews] review HTML event loop and how things fit into it (#489)

Hello TAG!

This is a continuation of the discussion in #197 because the things that I've been keeping that open for aren't really specific to `IntersectionObserver` anymore.

However, I think we do need to further review the HTML event loop, make sure it's specified clearly enough for new things to slot into it in an interoperable way, etc.

There's a bunch of prior discussion in the above issue and also in a bunch of other issues linked from it.

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