https://www.w3.org/TR/selectors-4/

Add a :snap pseudo-class for use with scroll-snapping.
Bikeshed the name as appropriate. :snap would be consistant with :focus.

Use case:
One might want to style the snapped item differently than the unsnapped item(s).
E.g. adding a thick border to emphasize the currently snapped item, or de-emphasize the not-currently-snapped item(s) via a filter property.