[css-snappoints] feedback on alternate model draft

https://drafts.csswg.org/css-scroll-snap/

Basically it seems good. Obviously I prefer the box-oriented model.

This draft lacks a processing model and that leaves many ambiguities about
which snappoints are actually relevant to each snapping container, and how
those snappoints are actually used to affect scrolling.

This draft is silent on the issue of what happens with dynamic changes to
the layout.

The use-cases for "group-based snapping" aren't very clear. Nor is the
behavior of the group snapping properties. I basically have no idea what
group snapping is for. It seems to me that for the use-cases cited,
proximity scrolling of individual items would work just as well. One way to
resolve this would to just drop group snapping from level 1.

Rob
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