CSS Color 4 deprecates some of the system colors and adds a "same-as" requirement for each of them - https://drafts.csswg.org/css-color-4/#deprecated-system-colors.
<rdar://problem/100642872>
Pull request: https://github.com/WebKit/WebKit/pull/16832
Committed 268124@main (a396d027d051): <https://commits.webkit.org/268124@main> Reviewed commits have been landed. Closing PR #16832 and removing active labels.
Re-opened since this is blocked by bug 261823
Pull request: https://github.com/WebKit/WebKit/pull/18937
Committed 269740@main (29dde143ed81): <https://commits.webkit.org/269740@main> Reviewed commits have been landed. Closing PR #18937 and removing active labels.