Implementation summary

This article treats scroll snapping as a three-part contract so you can diagnose failures precisely. The helper accepts a container styles object and an array of child style objects and returns a small structured result: ok, issues, and fixes. It checks four things in order: whether the container opted in with scroll-snap-type, whether the declared axis corresponds to the actual motion, whether children expose scroll-snap-align values the browser can land on, and whether the strictness is proximity (soft) instead of mandatory (hard).

Expected behavior

If no scroll-snap-type is present, the helper reports the container was not opted in and suggests adding scroll-snap-type (for example: "scroll-snap-type: x mandatory").

If children lack scroll-snap-align, it reports missing snap targets and suggests adding alignment on the snapping items.

If the container axis (x/y/inline/block/both) does not line up with the child alignments, it reports an axis mismatch and suggests changing the…