314081 2026-05-05 06:23:32 -0700 text/non-MathML children of annotation/annotation-xml are not rendered 2026-05-07 01:00:36 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 195797 1 fred.wang webkit-unassigned eri oldest_to_newest 2207639 0 479475 fred.wang 2026-05-05 06:23:32 -0700 Created attachment 479475 testcase Consider the following test case: <!DOCTYPE html> <meta charset="utf-8"/> <style> annotation-xml, annotation { display: initial; } </style> <math> <semantics> <mtext></mtext> <annotation>annotation</annotation> </semantics> </math> <math> <semantics>  <mtext></mtext><annotation-xml encoding="text/html"><span>annotation-xml</span></annotation-xml> </semantics> </math> Firefox and Chromium will render the text "annotation" and "annotation-xml". WebKit will only render annotation-xml This seems to be a regression from https://github.com/WebKit/WebKit/pull/51387/changes#diff-a9625de9071fd6b99215283bb592203a7ee03edf7e696a4261babbc7a409b660 because now annotation only accepts MathML children, not text node. The spec is not really clear about what to do with "invalid" children: https://github.com/w3c/mathml-core/issues/57 However, typical use case from MathML3 is to have text children for annotation and non-MathML markup for annotation-xml, so probably previous code was correct. 2208503 1 eri 2026-05-07 01:00:36 -0700 Pull request: https://github.com/WebKit/WebKit/pull/64452 479475 2026-05-05 06:23:32 -0700 2026-05-05 06:23:32 -0700 testcase visible-semantics-annotation.html text/html 460 fred.wang PCFET0NUWVBFIGh0bWw+CjxtZXRhIGNoYXJzZXQ9InV0Zi04Ii8+CjxzdHlsZT4KICBhbm5vdGF0 aW9uLXhtbCwgYW5ub3RhdGlvbiB7IGRpc3BsYXk6IGluaXRpYWw7IH0KPC9zdHlsZT4KPG1hdGg+ CiAgPHNlbWFudGljcz4KICAgIDxtdGV4dD48L210ZXh0PgogICAgPGFubm90YXRpb24+YW5ub3Rh dGlvbjwvYW5ub3RhdGlvbj4KICA8L3NlbWFudGljcz4KPC9tYXRoPgo8bWF0aD4KICA8c2VtYW50 aWNzPgogICAgPCEtLSBlbmNvZGluZyBhdHRyaWJ1dGUgZ3VhcmFudGVlcyB0aGUgSFRNTCBwYXJz ZXIga2VlcHMgdGhlIHNwYW4gYXMgYSBjaGlsZCBvZiBhbm5vdGF0aW9uLXhtbCAtLT4KICAgIDxt dGV4dD48L210ZXh0Pjxhbm5vdGF0aW9uLXhtbCBlbmNvZGluZz0idGV4dC9odG1sIj48c3Bhbj5h bm5vdGF0aW9uLXhtbDwvc3Bhbj48L2Fubm90YXRpb24teG1sPgogIDwvc2VtYW50aWNzPgo8L21h dGg+Cg==