RESOLVED DUPLICATE of bug 257643 186972
CSS.supports() applies quirks mode parsing 
https://bugs.webkit.org/show_bug.cgi?id=186972
Summary CSS.supports() applies quirks mode parsing
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Brent Fulgham
Comment 1 2022-07-15 13:27:01 PDT
This continues to be an issue in Safari 15.5+
Radar WebKit Bug Importer
Comment 2 2022-07-15 13:27:12 PDT
<rdar://problem/97090919>
Ahmad Saleem
Comment 3 2023-07-13 16:37:38 PDT
Passing all tests now in STP173. https://wpt.fyi/results/quirks/supports.html?label=experimental&label=master&aligned= I think "Anne" landed last part to fix this in following. https://github.com/WebKit/WebKit/commit/a21e36ac280d7e9918b0fa43094bbf37da3c01d9 *** This bug has been marked as a duplicate of bug 257643 ***
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