Currently, these shorthands belong to a logical property group: - border-top - border-right - border-bottom - border-left - border-block-start - border-block-end - border-inline-start - border-inline-end This doesn't make much sense, no need to e.g. map border-block-start to border-top, it should just expand to border-block-start-{width,style,color}. Then we can keep the special behavior confined to the longhands. Right now I don't think this is observable, but this refactoring is needed for bug 236199. My patch there (including this change) was previously reverted, so I guess it's safer to do the refactoring here.
This change will also align the implementation with the spec: https://drafts.csswg.org/css-logical/#box > Each set of parallel flow-relative properties and physical properties (IGNORING SHORTHAND PROPERTIES) related by setting equivalent styles on the various sides or dimensions of a box, forms a logical property group.
Created attachment 458288 [details] Patch
Created attachment 458290 [details] Patch
Comment on attachment 458290 [details] Patch Thanks for fixing this!
Created attachment 458372 [details] Patch
Had to update CSSPropertyAnimation.cpp to avoid an assert failure in debug.
Committed r293493 (250026@main): <https://commits.webkit.org/250026@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 458372 [details].
<rdar://problem/92372140>