There is enough debate in the CSS working group about the specifics of CSS Color 4 that I think it would be prudent of us to add runtime settings for the new new color(), lab() and lch() functions added in the past few months.
Created attachment 422516 [details] Patch
Committed r274053: <https://commits.webkit.org/r274053> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422516 [details].
<rdar://problem/75149189>