Currently, it's gray.
<rdar://problem/65289224>
Created attachment 403926 [details] Patch
In order to make review easier, please attach before/after screenshots from Big Sur and Catalina.
Created attachment 403929 [details] Big Sur Before
Created attachment 403930 [details] Big Sur after
Created attachment 403931 [details] Catalina before and after (same)
Comment on attachment 403926 [details] Patch r=me Screenshots of Dark Mode would be good too, for posterity.
I'll include Dark Mode screenshots in Bug 214163: Web Inspector: Tab bar colors of undocked Inspector should match Safari in Big Sur
Committed r264204: <https://trac.webkit.org/changeset/264204> All reviewed patches have been landed. Closing bug and clearing flags on attachment 403926 [details].