Found the problem. MWE
----------------
\documentclass[12pt,titlepage]{article}
\begin{document}
\ifdefined\HCode
Here is the animation from the Maple notebook:
\ScriptEnv{html}
{\NoFonts\hfill\break}
{\EndNoFonts}
\HCode{
<IMG SRC="movies/movie.gif" ALT="some text" WIDTH=750>
}
\fi
\end{document}
------------------
make4ht -ulm default -a warning maple.tex 'mathjax,htm'
[WARNING] domfilter: DOM parsing of maple.htm failed:
[WARNING] domfilter:
...ive/2022/texmf-dist/tex/luatex/luaxml/luaxml-mod-xml.lua:175: Unbalanced Tag
(/p) [char=746]
So it was the above `\HCode{...} code. Even though it works and
the the gif file plays OK in the HTML as can be seen at
https://12000.org/my_notes/faq/MAPLE/maple.htm
(search for the string "Here is the animation" on the page to see it)
But DOM parsor does not like the HTML above. What is wrong with it?
--Nasser
