floating figures not supported

[DavidGriffith]

I started using \begin{figure}[tp] to ensure that a page in the pdf is filled as much as possible before beginning a new page and displaying a full-page graphic. In the epub output, this text shuffling doesn't happen and horizontal lines are added right after the last line of text before \begin{figure}[tp] and after \end{figure}.

Also, \thisfloatpagestyle to do the equivalent of \thispagestyle within a floating figure causes tex4ebook to abort:

! Undefined control sequence.
\thisfloatpagestyle ... \csname \number \@currbox 
                                                  @float\endcsname {\thispag...
l.125 \thisfloatpagestyle{empty}

[michal-h21]

There is not similar mechanism to LaTeX floats in HTML, so they are always placed where they appeared in the LaTeX source. But the appearance can be configured, see for example this answer.

Regarding the compilation error, try to save the following code as floatpag.4ht:

% this command doesn't make sense in HTML anyway
\renewcommand\thisfloatpagestyle[1]{}
\Hinput{floatpag}
\endinput

[DavidGriffith]

Those horizontal lines still appear when I use a figure environment.

\documentclass[11pt]{article}%
\usepackage{float}
\begin{document}

This is my table

\begin{table}[H]
\centering
Foobar!
%\begin{tabular}[c]{|c|c|}\hline
%A & B \\\hline
%853.075 (sec) & 43.711 (sec)\\\hline
%14.218 (minutes) & 0.729 (minutes)\\\hline
%\end{tabular}
\end{table}

\begin{figure}[tp]
\centering
Hello World!
\end{figure}

my table is done    
\end{document}

[michal-h21]

What about the following configuration:

\Preamble{xhtml}
\Css{div.caption{text-align:center;}}
\Configure{float}{\csname par\endcsname\ShowPar}
{\ifvmode\IgnorePar\fi\EndP\HCode{<div class="float">}}
{\ifvmode\IgnorePar\fi\EndP\HCode{</div>}\ShowPar}
\ConfigureEnv{figure}
{\IgnorePar\EndP\HCode{<div class="figure">\Hnewline}%
\bgroup \Configure{float}{\ShowPar}{}{}%
}
{\egroup\IgnorePar\EndP\HCode{</div>}\par}
{}{}

\Css{div.float, div.figure{margin-left:auto;margin-right:auto;}}
\begin{document}
\EndPreamble

You will probably need to change the CSS for figures and floats for your needs.