This is repost frome here: https://tex.stackexchange.com/q/245234/2891

The `arydshln` package seems to clash with TeX4ht. From quick look at the source code I can see that it redefines \hline and \cline commands among others, so I am not really surprised that it doesn't work.

MWE:

\documentclass[12pt]{report}
\usepackage{arydshln}
\begin{document}
\begin{tabular}{|l|l|l|}\hline
text
& text 1
& text 2
\\\hline
\end{tabular}
\end{document}