270900 2024-03-12 23:38:54 -0700 [css-cascade] Proximity for implicit scopes seems to be ignored for rules with zero specificity 2024-03-19 13:52:24 -0700 1 1 1 Unclassified WebKit CSS Safari 17 All All RESOLVED FIXED https://github.com/web-platform-tests/wpt/pull/45205 HasReduction, InRadar P2 Normal --- 1 nathan m_dubet kizmarh koivisto m_dubet nathan obrufau webkit-bug-importer oldest_to_newest 2020658 0 470334 nathan 2024-03-12 23:38:54 -0700 Created attachment 470334 Reduced test case for implicit scope’s proximity being override by explicit scope when selectors have zero specificity. When an implicit `@scope` (i.e. a scope within an embedded style without an explicit scope root) is used and it contains a rule that has a sum of zero specificity (0,0,0) like the universal selector (i.e. `*`) or a selector wrapped with the `:where()` pseudo-class function, it seems like less proximate scopes with the same specificity can override the local scope. The only workaround is to bump the specificity of the selector used in the local scope. From what I’ve observed: - Other properties for the same selector with zero specificity inside the implicit scope where there is no conflict apply fine. - Order of appearance does not seem to cause any difference (e.g. ordering the less proximate explicit scope rule before or after the implicit one), so I assume this is a problem with how scope proximity is being determined for this situation. 2021133 1 webkit-bug-importer 2024-03-14 14:50:54 -0700 <rdar://problem/124640124> 2021189 2 m_dubet 2024-03-14 16:58:55 -0700 Pull request: https://github.com/WebKit/WebKit/pull/25918 2022132 3 ews-feeder 2024-03-19 07:43:17 -0700 Committed 276345@main (7b99ea4ee244): <https://commits.webkit.org/276345@main> Reviewed commits have been landed. Closing PR #25918 and removing active labels. 470334 2024-03-12 23:38:54 -0700 2024-03-12 23:38:54 -0700 Reduced test case for implicit scope’s proximity being override by explicit scope when selectors have zero specificity. implicit-scope-zero-specificity-test.html text/html 2778 nathan PCFkb2N0eXBlIGh0bWw+CjxodG1sIGxhbmc9ImVuLWNhIj4KICA8aGVhZD4KICAgIDxtZXRhIGNo YXJzZXQ9InV0Zi04Ij4KICAgIDxtZXRhIG5hbWU9InZpZXdwb3J0IiBjb250ZW50PSJ3aWR0aD1k ZXZpY2Utd2lkdGgsIGluaXRpYWwtc2NhbGU9MSI+CiAgICA8dGl0bGU+SW1wbGljaXQgc2NvcGUg YmVpbmcgb3ZlcnJpZGRlbiBieSBsZXNzIHByb3hpbWF0ZSwgZXhwbGljaXQgc2NvcGU8L3RpdGxl PgogICAgPG1ldGEgbmFtZT0iZGVzY3JpcHRpb24iIGNvbnRlbnQ9IkRlbW9uc3RyYXRlcyBhIGJ1 ZyBpbiBTYWZhcmkgYXJvdW5kIGltcGxpY2l0IHNjb3BlIHJ1bGVzIGFuZCBzZWxlY3RvcnMgd2l0 aCB6ZXJvIHNwZWNpZmljaXR5LiI+CiAgICA8c3R5bGU+CgkJOnJvb3QgewoJCQljb2xvci1zY2hl bWU6IGRhcmsgbGlnaHQ7CgkJCWZvbnQtZmFtaWx5OiBzeXN0ZW0tdWk7CgkJCWxpbmUtaGVpZ2h0 OiAxLjU7CgkJfQoKCQloMSwgaDIsIHAgewoJCQl0ZXh0LXdyYXA6IGJhbGFuY2U7CgkJfQoKCQlo MSwgaDIgewoJCQltYXgtaW5saW5lLXNpemU6IDIwZW07CgkJfQoKCQlwIHsKCQkJbWF4LWlubGlu ZS1zaXplOiAzNmVtOwoJCX0KCgkJYXJ0aWNsZSB7CgkJCWJvcmRlcjogMXB4IGRhc2hlZCBDYW52 YXNUZXh0OwoJCQlwYWRkaW5nOiAxcmVtOwoJCQltYXJnaW4tdHJpbTogYmxvY2s7CgkJCW1heC1p bmxpbmUtc2l6ZTogZml0LWNvbnRlbnQ7CgoJCQlAc3VwcG9ydHMgbm90IChtYXJnaW4tYmxvY2s6 IHRyaW0pIHsKCQkJCSogewoJCQkJCW1hcmdpbi1ibG9jay1zdGFydDogMDsKCgkJCQkJKyAqIHsK CQkJCQkJbWFyZ2luLWJsb2NrLXN0YXJ0OiByZXZlcnQtbGF5ZXI7CgkJCQkJfQoJCQkJfQoKCQkJ CTpsYXN0LWNoaWxkIHsKCQkJCQltYXJnaW4tYmxvY2stZW5kOiAwOwoJCQkJfQoJCQl9CgoJCQkr IGFydGljbGUgewoJCQkJbWFyZ2luLWJsb2NrLXN0YXJ0OiAxcmVtOwoJCQl9CgkJfQoJPC9zdHls ZT4KICA8L2hlYWQ+CiAgPGJvZHk+Cgk8aDE+SW1wbGljaXQgc2NvcGUgYmVpbmcgb3ZlcnJpZGRl biBieSBsZXNzIHByb3hpbWF0ZSwgZXhwbGljaXQgc2NvcGU8L2gxPgoJPHA+CgkgIEluIGVhY2gg ZXhhbXBsZSwgdGhlIHRleHQgb2YgdGhlIGltcGxpY2l0IHNjb3BlIGlzIGl0YWxpY2l6ZWQgdG8K CSAgZGVtb25zdHJhdGUgdGhhdCA8Y29kZT5Ac2NvcGU8L2NvZGU+IHJ1bGVzIGFyZSBhcHBseWlu ZyAod2hlbiB0aGVyZSBpcyBubwoJICBjb25mbGljdCkuIFRoZSBjb25mbGljdGluZyBzdHlsZSBp cyB0aGUgPGNvZGU+Y29sb3I8L2NvZGU+LiBDaHJvbWUKCSAgY29ycmVjdGx5IHVzZXMgdGhlIHN0 eWxlIGZvciB0aGUgaW1wbGljaXQgc2NvcGUsIHdoaWxlIFNhZmFyaSBkb2VzCgkgIG5vdC4KCgk8 L3A+Cgk8YXJ0aWNsZT4KCSAgPGgyPkxlc3MgcHJveGltYXRlLCBleHBsaWNpdCBzY29wZSBvcmRl cmVkIGZpcnN0IChib3RoIHVzaW5nIDxjb2RlPio8L2NvZGU+KTwvaDI+CgkgIDxwPkluIHRoZSBh cnRpY2xlPC9wPgoJICA8YXNpZGU+CgkJPHN0eWxlPgoJCSAgQHNjb3BlIChhcnRpY2xlOmZpcnN0 LW9mLXR5cGUpIHsKCQkJKiB7IGNvbG9yOiBEZWVwUGluazsgfQoJCSAgfQoJCSAgQHNjb3BlIHsK CQkJKiB7IGNvbG9yOiBDYW52YXNUZXh0OyBmb250LXN0eWxlOiBpdGFsaWM7IH0KCQkgIH0KCQk8 L3N0eWxlPgoJCTxwPkluIHRoZSBhc2lkZTwvcD4KCSAgPC9hc2lkZT4KCTwvYXJ0aWNsZT4KCTxh cnRpY2xlPgoJICA8aDI+TGVzcyBwcm94aW1hdGUsIGV4cGxpY2l0IHNjb3BlIG9yZGVyZWQgZmly c3QgKGJvdGggdXNpbmcgPGNvZGU+KjwvY29kZT4pPC9oMj4KCSAgPHA+SW4gdGhlIGFydGljbGU8 L3A+CgkgIDxhc2lkZT4KCQk8c3R5bGU+CgkJICBAc2NvcGUgewoJCQkqIHsgY29sb3I6IENhbnZh c1RleHQ7IGZvbnQtc3R5bGU6IGl0YWxpYzsgfQoJCSAgfQoJCSAgQHNjb3BlIChhcnRpY2xlOm50 aC1vZi10eXBlKDIpKSB7CgkJCSogeyBjb2xvcjogRGVlcFBpbms7IH0KCQkgIH0KCQk8L3N0eWxl PgoJCTxwPkluIHRoZSBhc2lkZTwvcD4KCSAgPC9hc2lkZT4KCTwvYXJ0aWNsZT4KCTxhcnRpY2xl PgoJICA8aDI+TGVzcyBwcm94aW1hdGUsIGV4cGxpY2l0IHNjb3BlIG9yZGVyZWQgZmlyc3QgKGJv dGggdXNpbmcgPGNvZGU+OndoZXJlKCk8L2NvZGU+KTwvaDI+CgkgIDxwPkluIHRoZSBhcnRpY2xl PC9wPgoJICA8YXNpZGU+CgkJPHN0eWxlPgoJCSAgQHNjb3BlIChhcnRpY2xlOm50aC1vZi10eXBl KDMpKSB7CgkJCTp3aGVyZShwKSB7IGNvbG9yOiBEZWVwUGluazsgfQoJCSAgfQoJCSAgQHNjb3Bl IHsKCQkJOndoZXJlKHApIHsgY29sb3I6IENhbnZhc1RleHQ7IGZvbnQtc3R5bGU6IGl0YWxpYzsg fQoJCSAgfQoJCTwvc3R5bGU+CgkJPHA+SW4gdGhlIGFzaWRlPC9wPgoJICA8L2FzaWRlPgoJPC9h cnRpY2xlPgoJPGFydGljbGU+CgkgIDxoMj5MZXNzIHByb3hpbWF0ZSwgZXhwbGljaXQgc2NvcGUg b3JkZXJlZCBsYXN0IChib3RoIHVzaW5nIDxjb2RlPjp3aGVyZSgpPC9jb2RlPik8L2gyPgoJICA8 cD5JbiB0aGUgYXJ0aWNsZTwvcD4KCSAgPGFzaWRlPgoJCTxzdHlsZT4KCQkgIEBzY29wZSB7CgkJ CTp3aGVyZShwKSB7IGNvbG9yOiBDYW52YXNUZXh0OyBmb250LXN0eWxlOiBpdGFsaWM7IH0KCQkg IH0KCQkgIEBzY29wZSAoYXJ0aWNsZTpudGgtb2YtdHlwZSg0KSkgewoJCQk6d2hlcmUocCkgeyBj b2xvcjogRGVlcFBpbms7IH0KCQkgIH0KCQk8L3N0eWxlPgoJCTxwPkluIHRoZSBhc2lkZTwvcD4K CSAgPC9hc2lkZT4KCTwvYXJ0aWNsZT4KICA8L2JvZHk+CjwvaHRtbD4K