tex4ht: conflict between `\[` `\]` environment and label, ref?

Question

I try to compile the following very simple code by tex4eboot:

\documentclass{amsart}

\begin{document}
\[
  x=y\label{t1}\tag{Test}
\]
Look at equation \ref{t1}.
\end{document}

It gives me errors:

[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line    Message
[ERROR]   htlatex: ./test.tex   5    Package amsmath Error: \tag not allowed here.
[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line    Message
[ERROR]   htlatex: ./test.tex   5    Package amsmath Error: \tag not allowed here.
[ERROR]   htlatex: Compilation errors in the htlatex run
[ERROR]   htlatex: Filename Line    Message
[ERROR]   htlatex: ./test.tex   5    Package amsmath Error: \tag not allowed here.

However, I can use pdflatex to compile it. I know that I can replace \[ and \] by equation. However, since usually the article is long and a regexpr to replace will lead to unexpected results. I wonder a workaround for this. Thanks!

Answer 1

Try the following configuration file:

\Preamble{xhtml}
\Configure{[]}{\begin{equation*}}{\end{equation*}}{}
\begin{document}
\EndPreamble

It basically does the same thing as Amsmath, configures \[ ... \] to the equation* environment.

This is the result:

I've added this code to tex4ht sources, so it should be default behavior in the future.

Answer 2

Generally \[...\] used for unnumbered display equation, if you change your code to \begin{equation}...\end{equation}, then your code works fine, and the modified MWE is:

\documentclass{amsart}

\begin{document}
\begin{equation}
  x=y\label{t1}\tag{Test}
\end{equation}
Look at equation \ref{t1}.
\end{document}

and the converted HTML output is: