This is one part of updating the implementation of scroll-snap-margin to match the most recent CSS Scroll Snap specification. See: https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin
Created attachment 412091 [details] Patch
Looks like you have some tests to fix.
Created attachment 412097 [details] Patch
Comment on attachment 412097 [details] Patch r=me with the caveat that if we see compat issues we might have to bring the old names back.
Thanks for the review! I guess I should mention, in case it changes your feelings about the change, that this patch maintains the old names as aliases. I will fix the failing ios test and try to land this tomorrow.
Created attachment 412112 [details] Patch
Committed r268889: <https://trac.webkit.org/changeset/268889> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412112 [details].
<rdar://problem/70587063>