Bug 251489

Summary: Implement the colspan attribute for the MathML <mtd> element
Product: WebKit Reporter: Frédéric Wang (:fredw) <fred.wang>
Component: MathMLAssignee: Frédéric Wang (:fredw) <fred.wang>
Status: RESOLVED WONTFIX    
Severity: Normal CC: karlcow, webkit-bug-importer
Priority: P2 Keywords: BrowserCompat, InRadar, WPTImpact
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugzilla.mozilla.org/show_bug.cgi?id=1814346
Bug Depends on:    
Bug Blocks: 195797    

Description Frédéric Wang (:fredw) 2023-02-01 01:41:50 PST 
MathML3 provides a "columnspan" attribute for the <mtd> element and this is implemented in WebKit.

MathML Core aligns to the HTML name, which is "colspan": https://w3c.github.io/mathml-core/#entry-in-table-or-matrix-mtd

Chromium bug (with tests): https://chromium-review.googlesource.com/c/chromium/src/+/4061476
Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1814346

This bug is about supporting "colspan" (and disabling "columspan" when MathMLCore is enabled).

That should be relatively easy to do:
https://searchfox.org/wubkat/search?q=columnspan&path=&case=true&regexp=false
Comment 1 Radar WebKit Bug Importer 2023-02-01 15:43:02 PST 
<rdar://problem/104935841>
Comment 2 Frédéric Wang (:fredw) 2023-07-12 01:12:22 PDT 
Closing per https://github.com/w3c/mathml-core/issues/180#issuecomment-1484532747