Thu Mar 24 21:20:55 2022, original submission:
reference and screen shots at
https://tex.stackexchange.com/questions/638304/tex4ht-no-longer-process-some-math-what-is-the-cause
This looks like a new serious problem.
I have a document that used to compile OK with tex4ht. I have not build it for someone. Today when I build it to HTML it is not able to convert some math to HTML.
This only happens when using mathjax mode. The math is all valid amsmath package math so One would expect mathjax to handle it directly.
Here is MWE
=====================
\documentclass[12pt]{book}
\usepackage{amsmath}
\begin{document}
\begin{align}%
\begin{Bmatrix}
c_{1}\\
c_{2}\\
c_{3}\\
c_{4}%
\end{Bmatrix}
& =%
\begin{pmatrix}
1 & -a & -b & ab\\
1 & a & -b & -ab\\
1 & a & b & ab\\
1 & -a & b & ab
\end{pmatrix}
^{-1}\tag{2}%
\end{align}
\end{document}
====================
And now
make4ht -ulm default -a debug foo2.tex "mathjax,htm"
gives HTML error (screen shot)
tex4ht compiles it OK when removing mathjax options, which indicates mathjax is either not able to handle this correctly or tex4ht generated wrong HTML? But then how did it work OK before?
Here is the raw HTML
==================
<!DOCTYPE html>
<html lang='en-US' xml:lang='en-US'>
<head><title></title>
<meta charset='utf-8' />
<meta content='TeX4ht (https://tug.org/tex4ht/)' name='generator' />
<meta content='width=device-width,initial-scale=1' name='viewport' />
<link href='foo2.css' rel='stylesheet' type='text/css' />
<meta content='foo2.tex' name='src' />
<script>window.MathJax = { tex: { tags: "ams", }, }; </script>
<script async='async' id='MathJax-script' src='https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml-full.js' type='text/javascript'></script>
</head><body>
<!-- l. 33 --><p class='noindent'>\begin {align} \csname @begin:Bmatrix\endcsname \choose:begin {\let \choose:begin \@firstoftwo \ifx \EndPicture \:Undef \PushStack \envn:list \n:list \SaveEverypar \fi \let \chk:pic \EndPicture \ifx \EndPicture \:UnDef \list:save \let \after:end \empty \csname before:beginBmatrix\endcsname \fi \UseHook {env/Bmatrix/before}\@ifundefined {Bmatrix}{\def \reserved@a {\@latex@error {Environment Bmatrix undefined}\@eha }}{\def \reserved@a {\def \@currenvir {Bmatrix}\edef \@currenvline {\on@line }\ifx \EndPicture \:UnDef \ifx \this:listConfigure \empty \null:listConfigure \csname onBmatrix:list\endcsname \fi \fi \@execute@begin@hook {Bmatrix}\csname Bmatrix\endcsname }}\global \@ignorefalse \begingroup \@endpefalse \reserved@a }{\o:begin: {Bmatrix}} c_{1}\\ c_{2}\\ c_{3}\\ c_{4}\end {Bmatrix} & =\begin {pmatrix} 1 & -a & -b & ab\\ 1 & a & -b & -ab\\ 1 & a & b & ab\\ 1 & -a & b & ab \end {pmatrix} ^{-1}\tag {2} \end {align}
</p>
</body>
</html>
===================
What has changed to cause this math no longer to work in mathjax mode of tex4ht?
Using TL 2021, fully updated about 2 week ago. On Linux ubuntu.
Thanks
--Nasser
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