Re: [w3ctag/design-reviews] Intersection Observer review (#197)

I want to hopefully close the loop on the comment by @dbaron:

> So one thing I need to investigate further is that it feels to me that intersection observer running before the animation frame callbacks seems wrong, I think it should run substantially after them, with a bunch of other stuff in between, since rAF is primarily a writing callback (so should be early, before the natural style/layout), whereas IntersectionObserver is primarily a reading callback (so should be late, after the natural style/layout).

You are quite right that IntersectionObserver should run after rAF callbacks; I just created a [pull request](https://github.com/w3c/IntersectionObserver/pull/331l) for that change. The original language there was a mistake.

This sidesteps the issue of when exactly style/layout/paint gets updated, but that issue is better addressed in the separate spec issues you called out.

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