\Preamble{xhtml,html5,mathml,2,sec-filename,info,fn-in,fonts}

% Logical elements
\NewLogicalBlock{codesample}
\SetTag{codesample}{figure}
\SetBlockProperty{codesample}{role}{doc-example}% set dPub property

\NewLogicalBlock{acknowledgements}
\SetTag{acknowledgements}{section}
\SetBlockProperty{acknowledgements}{role}{doc-acknowledgements}

\NewLogicalBlock{warning}
\SetTag{warning}{section}
\SetBlockProperty{warning}{role}{doc-notice}

% external stylesheet
\Configure{AddCss}{style.css}

% Declare graphics extensions
\DeclareGraphicsExtensions{.svg,.png,.jpg}

% Mini TOC
\Configure{crosslinks+}{%
  \bgroup
  % container for the page toc
  \Configure{tableofcontents}{\IgnorePar\EndP\HCode{<nav class="TOC">}\IgnorePar}
  {\HCode{\Hnewline}}{\IgnorePar\HCode{</nav>\Hnewline}\ShowPar}{}{}%
  \TableOfContents[chapter,section,subsection]% Print table of contents before crosslinks
  \egroup
  \ifvmode\IgnorePar\fi\EndP%
  \HCode{<main class="main-content">\Hnewline<nav class="crosslinks-top">} }
  {\HCode{</nav>\Hnewline}}
{\ifvmode\IgnorePar\fi\EndP%
  \HCode{<nav class="crosslinks-bottom">}}{\HCode{</nav>}}{}{}

% configuration for TOC on the main page
\Configure{tableofcontents}{\IgnorePar\EndP\HCode{<nav class="TOC">}\IgnorePar}
{}{\IgnorePar\HCode{</nav>\Hnewline<main class="main-content">\Hnewline}\ShowPar}{}{}%

% close the <main> element started in \Configure{crosslinks+}
\Configure{@/BODY}{\ifvmode\IgnorePar\fi\EndP\HCode{</main>}}

% show only crosslinks to prev, main and next pages
\Configure{crosslinks*}{prev}{up}{next}{}


\Configure{texttt}{\HCode{<code>}\NoFonts}{\EndNoFonts\HCode{</code>}}
\Configure{verb}{\HCode{<code>}\NoFonts}{\EndNoFonts\HCode{</code>}}
\ConfigureEnv{texsource}{\BlockElementStart{codesample}{class="texsource"}}{\BlockElementEnd{codesample}{}}{}{}
\ConfigureEnv{shellcommand}{\BlockElementStart{codesample}{class="shellcommand"}}{\BlockElementEnd{codesample}{}}{}{}
\ConfigureEnv{htmlsource}{\BlockElementStart{codesample}{class="htmlsource"}}{\BlockElementEnd{codesample}{}}{}{}

\ConfigureEnv{acknowledgements}{\BlockElementStart{acknowledgements}{}}{\BlockElementEnd{acknowledgements}{}}{}{}
\ConfigureEnv{warning}{\BlockElementStart{warning}{}}{\BlockElementEnd{warning}{}}{}{}

\begin{document}
\EndPreamble