Created attachment 147988 [details] Testcase The background of the <html> element should extend to fill the viewport, even when the <html> element is transformed (and has a background which has propagated from the body).
It is following test on WPT: https://wpt.fyi/results/css/css-transforms/transform-background-007.html?label=master&label=experimental&aligned=&q=transform-background- We still fail this as of STP185.
<rdar://problem/122587992>