[tex4ht] [bug #403] tex4ht fails with scrartcl class when defining \rm command. Argument of \popthree has an extra

[Nasser M. Abbasi]

URL:
  <http://puszcza.gnu.org.ua/bugs/?403>

                 Summary: tex4ht fails with scrartcl class when defining \rm
command. Argument of \popthree has an extra
                 Project: tex4ht
            Submitted by: nma123
            Submitted on: Sat 20 Oct 2018 08:04:41 PM EEST
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Minor
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:


Posted at 

https://tex.stackexchange.com/questions/455994/tex4ht-fails-with-scrartcl-class-when-defining-rm-command-argument-of-popthre

This MWE compiles OK with lualatex and pdflatex but fails with tex4ht. Why?
And this happens only when using scrartcl and not with article.

---------------------
\documentclass[11pt]{scrartcl}%{article}
\DeclareOldFontCommand{\rm}{\normalfont\rmfamily}{\mathrm}

\begin{document}
test
\end{document}
------------------

Now

------------------
 make4ht -ulm draft foo.tex
 ....
(/usr/local/texlive/2018/texmf-dist/tex/generic/tex4ht/html5.4ht))
(/usr/local/texlive/2018/texmf-dist/tex/generic/tex4ht/scrartcl.4ht
! Argument of \popthree has an extra }.
<inserted text>
\par
l.33 \:temp{rm}
?
------------------------

I also tried

 \documentclass[11pt,enabledeprecatedfontcommands]{scrartcl}

But make4ht still gave same error.





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