[tex4ht] [bug #456] what is so special about $\ln$ when using tex4ht in mathjax mode?

Sun Apr 19 02:20:02 CEST 2020

URL:
  <http://puszcza.gnu.org.ua/bugs/?456>

                 Summary: what is so special about $\ln$ when using tex4ht in
mathjax mode?
                 Project: tex4ht
            Submitted by: nma123
            Submitted on: Sun 19 Apr 2020 03:19:12 AM EEST
                Category: None
                Priority: 5 - Normal
                Severity: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

reference:

https://tex.stackexchange.com/questions/539385/what-is-so-special-about-ln-when-using-tex4ht-in-mathjax-mode

When using mathjax mode in tex4ht, it fails to render section title which
contain $\ln$ but works for all other symbols I tried so far.

What is so special about $\ln$ ?

MWE
===================
\documentclass[11pt]{article}%

\usepackage{amsmath}
\begin{document}
This is a document

\section{$\int \arcsin(x) \ln x  \,dx$}
test

\section{$\int \arcsin(x) \sqrt x \,dx$}
test

\section{$\int \arcsin(x) \sin x  \,dx$}

\end{document}
=====================

It must be compiled as follows to see the problem

make4ht -ulm default  foo.tex "htm,1,mathjax"

In the above, the split level is 1. Anything more than 0 is needed to show the
problem.

Now the HTML looks like this (please see link above. Do not know how to add
graphics here)

Not using mathjax mode with tex4ht also solves the problem.

Here is the raw HTML generated. Notice that \qopname \relax o{ln}x is
generated by tex4ht before mathjax does anything.

=============================
<!DOCTYPE html> 
<html lang="en-US" xml:lang="en-US" > 
<head><title></title> 
<meta  charset="utf-8" /> 
<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)" /> 
<meta name="viewport" content="width=device-width,initial-scale=1" /> 
<link rel="stylesheet" type="text/css" href="foo.css" /> 
<meta name="src" content="foo.tex" /> 
 <script type="text/x-mathjax-config"> MathJax.Hub.Config({ 'fast-preview':
{disabled: true}, TeX: { extensions: ["color.js","AMSmath.js"],
equationNumbers: { autoNumber: "AMS" } }, extensions: ["tex2jax.js"], tex2jax:
{  inlineMath: [ ["\\\(","\\\)"] ], displayMath: [ ['$$','$$'], ["\\[","\\]"]
], processEscapes: true, processEnvironments: true } }); </script> 
 <script type="text/javascript"
src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?config=TeX-AMS-MML_HTMLorMML"></script>

</head><body 
>
<!--l. 6--><p class="noindent" >This is a document
</p>   
<div class="tableofcontents">
<span class="sectionToc" >1 <a 
href="#x1-10001" id="QQ2-1-1">\(\int \arcsin (x) \qopname \relax o{ln}x
\,dx\)</a></span>
<br />   <span class="sectionToc" >2 <a 
href="#x1-20002" id="QQ2-1-2">\(\int \arcsin (x) \sqrt x \,dx\)</a></span>
<br />   <span class="sectionToc" >3 <a 
href="#x1-30003" id="QQ2-1-3">\(\int \arcsin (x) \sin x \,dx\)</a></span>
</div>   
<h3 class="sectionHead"><span class="titlemark">1   </span> <a 
 id="x1-10001"></a>\(\int \arcsin (x) \ln x \,dx\)</h3>
<!--l. 9--><p class="noindent" >test
</p><!--l. 11--><p class="noindent" >
</p>   
<h3 class="sectionHead"><span class="titlemark">2   </span> <a 
 id="x1-20002"></a>\(\int \arcsin (x) \sqrt x \,dx\)</h3>
<!--l. 12--><p class="noindent" >test
</p><!--l. 14--><p class="noindent" >
</p>   
<h3 class="sectionHead"><span class="titlemark">3   </span> <a 
 id="x1-30003"></a>\(\int \arcsin (x) \sin x \,dx\)</h3>

</body> 
</html>

==================

Is this a bug in tex4ht? 

TL 2019 on Linux

    _______________________________________________________

Reply to this item at:

  <http://puszcza.gnu.org.ua/bugs/?456>

_______________________________________________
  Message sent via/by Puszcza
  http://puszcza.gnu.org.ua/