[resize-observer] The monkey patching of the event loop processing model appears to be outdated

[rniwa]

The entire section about HTML event loop processing model appears to be outdated.

I think this section is trying to monkey patch step 14 of updating the rendering step in the current processing model.

The spec also mentions steps like "recall styles" and "update layout". Since these aren't concepts formally defined anywhere, it's probably best to consolidate as a single step to generate or update the CSS boxes and their geometry or something instead too.

[domenic]

This is especially problematic because it is unclear when ResizeObserver callbacks happen in relationship to the other things that happen during "update the rendering", such as:

• requestAnimationFrame callbacks
• IntersectionObserver callbacks
• Paint timing
• Web animations events
• scroll and resize events
• autofocus

If someone could properly upstream this monkeypatch to HTML, with tests, that would be much appreciated.

[domenic]

/cc @emilio I think this can now be resolved by removing the section as I noted in whatwg/html#8348 (comment) .