NEW308277
Handle lspace/rspace as per MathML Core 
https://bugs.webkit.org/show_bug.cgi?id=308277
Summary Handle lspace/rspace as per MathML Core
Frédéric Wang (:fredw)
Reported 2026-02-20 00:39:06 PST
Created attachment 478417 [details] Testcase In MathML Core, lspace/rspace to calculate child spacing during mrow layout: https://w3c.github.io/mathml-core/#layout-of-mrow WebKit instead adds lspace/rspace to the inline size of core operator.
Attachments
Testcase (440 bytes, text/html)
2026-02-20 00:39 PST, Frédéric Wang (:fredw) 		no flags
Details
Screenshot (chromium) (10.31 KB, image/jpeg)
2026-02-20 00:39 PST, Frédéric Wang (:fredw) 		no flags
Details
Screenshot (webkit) (12.57 KB, image/jpeg)
2026-02-20 00:39 PST, Frédéric Wang (:fredw) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Frédéric Wang (:fredw)
Comment 1 2026-02-20 00:39:23 PST
Created attachment 478418 [details] Screenshot (chromium)
Frédéric Wang (:fredw)
Comment 2 2026-02-20 00:39:40 PST
Created attachment 478419 [details] Screenshot (webkit)
Frédéric Wang (:fredw)
Comment 3 2026-02-20 00:40:35 PST
Note that Firefox does not follow MathML Core and is different from WebKit, see https://bugzilla.mozilla.org/show_bug.cgi?id=2018114 for the Mozilla bug
Frédéric Wang (:fredw)
Comment 4 2026-02-26 03:43:11 PST
https://github.com/web-platform-tests/wpt/pull/58037 has been merged with a bunch of new tests for lspace/rspace. I suspect WebKit does not handle very well embellished operators (there are existing tests for them), so that's probably something to handle too.
Radar WebKit Bug Importer
Comment 5 2026-02-27 00:40:11 PST
<rdar://problem/171339453>
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