e.g. > CSS.supports("background-repeat-x: inherit") < true > CSS.supports("background-repeat-x", "inherit") < true Similar to bug 222280 and bug 223141.
<rdar://problem/77320610>
Created attachment 431310 [details] Patch
FWIW, my much larger patch on Bug 217802 tries to clean a lot of this up, and is basically a superset of this. (Sorry for not linking them together!)
Created attachment 431311 [details] Patch
Created attachment 431443 [details] Patch
Committed r278933 (238864@main): <https://commits.webkit.org/238864@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 431443 [details].