See https://wpt.fyi/results/css/css-sizing/contain-intrinsic-size?label=experimental&label=master&aligned Safari fails 16 out of 17 test cases even though the test expectation checked into WebKit says we pass them: https://github.com/WebKit/WebKit/blob/main/LayoutTests/imported/w3c/web-platform-tests/css/css-sizing/contain-intrinsic-size/auto-006-expected.txt
These will start passing when content-visibility is enabled in shipping configuration.