[tex4ht] Help on mathjax V3 configuration. Syntax error

[Michal Hoftich]

Hi Nasser,


> ====================================
> (/usr/local/texlive/2019/texmf-dist/tex/generic/tex4ht/html5.4ht)) (./foo.aux)
> ! Undefined control sequence.
> \\  ->\let \reserved at e
>                         \relax \let \reserved at f \relax \@ifstar {\let \reserv...
>
> l.101 \EndPreamble
> =======================


I don't get any error when I compile your mwe, it just doesn't work.
It works when I use the URL you pass in `\Configure{@HEAD}` to
\Configure{MathjaxSource}:

\Configure{MathjaxSource}{https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js}

I am bit surprised that I don't need to use \detokenize around TeX
macros in Mathjax configuration. I used some of your declared macros
and they seem to work.

Best regards,
Michal