not rendered as subscript
Closed, ResolvedPublicBUG REPORT
Actions

Assigned To

Authored By

	Dexxor
	Feb 11 2025, 10:27 AM

Description

Enable "MathML (experimental; no images)" in Special:Preferences → Apperance → Math. Then preview a page with the contents <math>_12</math>.
This should render as "₁2" (with subscript 1) but it is rendered as "12" because the generated MathML is invalid ("Incorrect number of children for <msub/> tag" is printed to the Firefox console). The same problem occurs with <math>{_{1}^2}</math> but in that case no <msub> element is generated.

This subscript notation is used in over 50 articles in dewiki (particularly noticeable here) and over 100 articles in enwiki.

Details

Related Changes in Gerrit:

Subject	Repo	Branch	Lines +/-
Fix: rendering of _1	mediawiki/extensions/Math	REL1_43	+10 -7
Add changes test	mediawiki/extensions/Math	REL1_43	+2 K -9
Fix: rendering of _1	mediawiki/extensions/Math	master	+10 -7
Add changes test	mediawiki/extensions/Math	master	+2 K -10

Customize query in gerrit

Related Objects
Search...

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		None	T375318 Native MathML mode formatting bugs
In Progress	BUG REPORT	Physikerwelt	T375238 Client-side MathJax rendering problems
Resolved	BUG REPORT	Physikerwelt	T386071 <math>_1</math> not rendered as subscript
Resolved		Physikerwelt	T386318 <math>\sin \cos^2</math> not rendered as superscript
Resolved		Physikerwelt	T387952 <math>{_{1}^2}</math> not rendered as subscript

Event Timeline

Dexxor created this task.Feb 11 2025, 10:27 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 11 2025, 10:27 AM

Dexxor added parent tasks: T375238: Client-side MathJax rendering problems, T375318: Native MathML mode formatting bugs.Feb 11 2025, 10:30 AM

A possibly related bug is that the "2" in <math>\sin \cos^2</math> or <math>\deg \cos^2</math> is not rendered as a superscript (i.e. I would expect to see "sin⁡ cos²" but it actually renders as "sin⁡ cos⁡2"). Again, "Invalid markup: Incorrect number of children for <msup/> tag" is printed to the Firefox console. Interestingly, <math>\sin^2 \cos^2</math> is rendered correctly as "sin⁡² cos²".

Change #1118986 had a related patch set uploaded (by Physikerwelt; author: Physikerwelt):

[mediawiki/extensions/Math@master] Add changes test

https://gerrit.wikimedia.org/r/1118986

gerritbot added a project: Patch-For-Review.Feb 12 2025, 7:08 AM

Another related bug: The "i=0" in <math>\min\limits_{i=0}</math> should be rendered below "min" but it's not.

It seems this has never worked with native MathML rendering. This makes it easier to fix, as I don't remember something that I changed recently that could have broken this feature

Change #1119368 had a related patch set uploaded (by Physikerwelt; author: Physikerwelt):

[mediawiki/extensions/Math@master] Fix: rendering of _1

https://gerrit.wikimedia.org/r/1119368