In https://bugs.webkit.org/show_bug.cgi?id=245533, we added a few new system colors. ButtonBorder white (matching existing ActiveBorder and InactiveBorder values). SelectedItem lightGray (matching existing Menu value) SelectedItemText black (matching existing *Text values) Mark yellow (matching background-color of <mark> in UA stylesheet) MarkText black (matching color of <mark> in UA stylesheet) AccentColor sRGB { 0, 122, 255 } (matching color of system-control-accent) AccentColorText black (matching existing *Text values) That change only added platform agnostic values. We should audit the list to determine if any would be better with OS specific overrides. For example, AccentColor might be useful as an alias of -apple-system-control-accent on macOS.
<rdar://problem/100662954>