[css-conditional-5] Draft spec for scroll-state() #6402

[lilles]

Per resolution in [1], add scroll-state() as a query function to query sticky, snap, and overflow scroll states with a new container-type for scroll-state queries.

[1] #6402 (comment)

[dbaron]

This looks reasonable. One big question at the top (about whether it's supposed to be in this file at all), and then a bunch of specific comments on the text.

[svgeesus]

Overall approve, as I prefer to see good PR merged sooner and details worked out later. But I will wait for one of the other editors to do the merge. Not all of the @dbaron comments have been resolved.

[lilles]

Overall approve, as I prefer to see good PR merged sooner and details worked out later. But I will wait for one of the other editors to do the merge. Not all of the @dbaron comments have been resolved.

Thanks!

[svgeesus]

@dbaron are you now satisfied with the responses to your helpful comments on this PR? If so please r+

[dbaron]

I left four new comments (two of which show up directly above, and two of which only show up in the middle of the earlier threads), but I'm fine with this landing either in its current state or with an attempt to address those.