254204 2023-03-21 02:12:47 -0700 Checking for nested CSS support with CSS.supports("selector(&)") doesn't work 2023-03-21 10:27:30 -0700 1 1 1 Unclassified WebKit CSS Safari Technology Preview Unspecified Unspecified RESOLVED DUPLICATE 252301 P2 Normal --- 1 sam.willis webkit-unassigned ntim oldest_to_newest 1942797 0 sam.willis 2023-03-21 02:12:47 -0700 Checking for nested css support (#223497, #249263) via JavaScript using `CSS.supports("selector(&)")` doesn't work. I believe the expected behaviour is that it would return true in browsers that do support it (such as Safari Technology Preview), Chrome Canary does return true for this check. 1942834 1 gsnedders 2023-03-21 08:37:21 -0700 This looks like a dupe of Bug 252301. What version were you testing? 1942858 2 sam.willis 2023-03-21 10:14:00 -0700 Sorry, missed that in my search. Tested on latest Safari Technology Preview, version 165. Just tried to run the latest build from https://webkit.org/build-archives/ (for the first time) but can't get it to run. Will check on the new Tech Preview when I assume it drops in the next couple of days. 1942862 3 ntim 2023-03-21 10:27:30 -0700 Bug 252301 should be in the next STP. *** This bug has been marked as a duplicate of bug 252301 ***