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I'm using Ubuntu 24.04, Chrome and Wikimedia 1.46.0-alpha (a6b78ca) 08:35, 16. Feb. 2026 mit MathJax rendering.
If you render the code
<math>A {\bigsqcup} B</math>,
<math>A {\sqcup} B</math> and
<math>A {\sqsubset} B</math> with MathJax, the spacing before and after the operator is incorrect. The spacing is too large. I have not tested other operators.
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Render curlies with 1 element if it produces operators | mediawiki/extensions/Math | master | +13 -3 |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | Feature | JeanCASPAR | T397585 Provide a macro for putting arbitrary Unicode content in <mo> tag | ||
| Open | Physikerwelt | T271001 Transition to MathML rendering as default | |||
| Open | BUG REPORT | Physikerwelt | T375238 Client-side MathJax rendering problems | ||
| Resolved | BUG REPORT | Physikerwelt | T417592 Using MathJax - Too large space after and before operatores |
Let's check mathoid renderes
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="A{\sqcup }B">
<semantics>
<mrow>
<mi>A</mi>
<mrow class="MJX-TeXAtom-ORD">
<mo>⊔<!-- ⊔ --></mo>
</mrow>
<mi>B</mi>
</mrow>
<annotation encoding="application/x-tex">A{\sqcup }B</annotation>
</semantics>
</math>and
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="A\sqcup B">
<semantics>
<mrow>
<mi>A</mi>
<mo>⊔<!-- ⊔ --></mo>
<mi>B</mi>
</mrow>
<annotation encoding="application/x-tex">A\sqcup B</annotation>
</semantics>
</math>so the only noticeable difference is the additional mrow with class="MJX-TeXAtom-ORD"
I tex it also renders with different spaces
currently for wikitexvc the output of both is exactly the same.
<math xmlns="http://www.w3.org/1998/Math/MathML" class="mwe-math-element mwe-math-element-inline"><mrow data-mjx-texclass="ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>A</mi><mo stretchy="false">⊔</mo><mi>B</mi></mstyle></mrow></math>
Change #1249039 had a related patch set uploaded (by Physikerwelt; author: Physikerwelt):
[mediawiki/extensions/Math@master] WIP: Render curlies with 1 element if it produces operators
This can be fixed easily. However, it has some side effects. Thus we need to discuss that it does not break more than it fixes. It is also related to the general discussion how to represent {} internally in T419194
I found another solution, without adding mrows, and did also check for potential regressions.
the only difference is that the spacing around def got smaller with native rendering, which seems to be okay as it get's closer to the previous (SVG) rendering.
Change #1249039 merged by jenkins-bot:
[mediawiki/extensions/Math@master] Render curlies with 1 element if it produces operators
