https://github.com/w3c/csswg-drafts/issues/9519 Add a "pair" keyword to scroll-snap-type. If used, when the container scroll snaps to an element on one axis, it should snap to the same element on the other axis. In the existing spec, the "both" keyword allows the scroll container to select snap targets in X and Y axes independently and snap to different targets.
See explainer
Explainers: https://github.com/explainers-by-googlers/scroll-snap-type-pair