I just got this error, only with tex4ht:
-----------------------------------------
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsfonts/umsb.fd)
! Package amsmath Error: \tag not allowed here.
See the amsmath package documentation for explanation.
Type H <return> for immediate help.
...
l.11 ...thrm{d}y}}{\mathop{\mathrm{d}x}}\right) \tag
{1A}
?
--------------------
The funny thing, when I went to ask about it at
https://tex.stackexchange.com, it turned out I asked
the same question more than one year ago and forgot:
https://tex.stackexchange.com/questions/383129/tex4ht-gives-package-amsmath-error-tag-not-allowed-here
But there was no resolution on that.
Is this a bug in tex4ht? Should I enter a bug on this? MWE below.
THis compiled OK with lualatex and pdflatex. So I expected it to
compile ok with tex4ht as well.
cat T.tex
------------------------------
\documentclass[11pt]{book}
\usepackage{amsmath,mathtools,amssymb}
\begin{document}
\[
y \left( x \right) = G\left(x, \frac{
\mathop{\mathrm{d}y}}{\mathop{\mathrm{d}x}}\right) \tag{1A}
\]
-----------------------------
compiled with
make4ht -ulm draft
-f html5+dvisvgm_hashes T.tex 'htm,0,pic-align,notoc*,p-width,svg'
why \tag does not work with tex4ht in \[ \] but works with lualatex?
What is a workaround? comment on the above question says not to use
align for single equation and so I use \[ \] for single equation
but want to tage it also.
thanks
--Nasser
