See failures at: https://wpt.fyi/results/css/css-backgrounds?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=subtest&q=css%2Fcss-backgrounds%2Fbackground-color-body-propagation https://github.com/web-platform-tests/wpt/blob/fe13265b5a/css/css-backgrounds/background-color-body-propagation-008.html https://github.com/web-platform-tests/wpt/blob/fe13265b5a/css/css-backgrounds/background-color-body-propagation-009.html
Seems like there was some work done in bug 233535.
Pull request: https://github.com/WebKit/WebKit/pull/10574
Committed 260766@main (2a4bd98a580e): <https://commits.webkit.org/260766@main> Reviewed commits have been landed. Closing PR #10574 and removing active labels.
<rdar://problem/105850374>