199170 2019-06-24 11:40:03 -0700 2nd selector in the compound selector list in :host pseudo-class like ":host(.class1, .class2) .class3" is not supported 2021-03-04 05:32:03 -0800 1 1 1 Unclassified WebKit CSS Safari Technology Preview Unspecified Unspecified RESOLVED INVALID BrowserCompat, InRadar P2 Normal --- 1 timdream webkit-unassigned andruud koivisto simon.fraser webkit-bug-importer oldest_to_newest 1547440 0 372778 timdream 2019-06-24 11:40:03 -0700 Created attachment 372778 test.html Summary: 2nd selector in the compond selector list in :host pseudo-class like ":host(.class1, .class2) .class3" is not supported Steps To Reproduce: 1. Open up test.html 2. Inspect the test. Results: The text should be red. Tested on STP Release 85 (Safari 13.0, WebKit 14608.1.28.1) macOS 10.14.4 (18E226) Notes: If I change the selector to |:host(.class2, .class1) .class3| then the text is red, indicating that the selector is supported but not implemented correctly. === Firefox doesn’t seem to support this yet (https://bugzilla.mozilla.org/show_bug.cgi?id=1561010) and Chrome can parse this test correctly. === Was filed as rdar://52060837 1735780 1 andruud 2021-03-04 04:59:03 -0800 At some point :host() was indeed supposed to accept a <compound-selector-list>, but this is no longer the case. Only a single <compound-selector> should be supported now. https://drafts.csswg.org/css-scoping/#selectordef-host 372778 2019-06-24 11:40:03 -0700 2019-06-24 11:40:03 -0700 test.html test.html text/html 288 timdream PHNjcmlwdD4KCndpbmRvdy5vbmxvYWQgPSAoKSA9PiB7CiAgdmFyIHNyID0gZG9jdW1lbnQuYm9k eS5hdHRhY2hTaGFkb3coeyBtb2RlOiAiY2xvc2VkIiB9KTsKICBzci5pbm5lckhUTUwgPSBgPHN0 eWxlPgoKOmhvc3QoLmNsYXNzMSwgLmNsYXNzMikgLmNsYXNzMyB7CiAgY29sb3I6IHJlZDsKfQoK ICA8L3N0eWxlPjxkaXYgY2xhc3M9ImNsYXNzMyI+VGhpcyB0ZXh0IHNob3VsZCBiZSByZWQ8L2Rp dj5gOwoKICBkb2N1bWVudC5ib2R5LmNsYXNzTGlzdC5hZGQoJ2NsYXNzMicpOwp9Cgo8L3Njcmlw dD4K