Here's a sample LaTeX document where I'm experimenting with newenvironment, a definition list, and tables (the tabular environment. I don't have the output with me at the moment, but I think all of these worked correctly when using pdflatex and latex2html.

\documentclass[a4paper,11pt]{article}
\author{Al Alexander}
\title{}
\begin{document}
\maketitle
\tableofcontents


% DESCRIPTION TEST

%\newcommand{\entrylabel}[1]{\mbox{\textsf{#1:}}\hfil}
%\newenvironment{entry}
%  {\begin{list}{}%
%     {\renewcommand{\makelabel}{\entrylabel}%
%     \setlength{\labelwidth}{35pt}%
%     \setlength{\leftmargin}{\labelwidth+\labelsep}%
%     }%
%  }%
%  {\end{list}}
  
\newenvironment{deflist}[1][\quad]%
  {\begin{list}{}{%
     \renewcommand{\makelabel}[1]{\textbf{##1}\hfil}%
     \settowidth{\labelwidth}{\textbf{#1}}%
     \setlength{\leftmargin}{\labelwidth+\labelsep}}}
  {\end{list}}

\begin{deflist}
\item[Java]\mbox{}\\A great language for enterprise applications.
\item[Perl]\mbox{}\\A great language for CGI programs and text processing.
\item[C++]\mbox{}\\A difficult but fun language.
\end{deflist}

% TABLE TEST
% WANT TO SEE HOW THIS CONVERTS TO HTML

\begin{tabular}{|l|c|r|}
 \hline
 LANGUAGE & DESCRIPTION & SOMETHING\\
 \hline
 JAVA & A great language for enterprise applications. & R2C3\\
 \hline
 PERL & A great language for CGI programs and text processing. & R3C3\\
 \hline
 C++ & A difficult language. & R4C3\\ 
 \hline
\end{tabular}

\end{document}