https://drafts.csswg.org/css-transforms-2/#propdef-translate says: Note: The resolved value of the translate property is the computed value, and thus getComputedStyle() includes percentage values in its results. We need to implement this to fix the test.
Created attachment 437940 [details] Patch
Created attachment 437956 [details] Patch
Committed r282315 (241585@main): <https://commits.webkit.org/241585@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 437956 [details].
<rdar://problem/83018210>