Use 'titlepage' environment instead of \maketitle, and shorten \title

This makes the \title work better in the LaTeXML output.

MLS.tex

@@ -3,17 +3,10 @@
 \usepackage[utf8]{inputenc}
 \input{preamble.tex}
 
-\title{%
-\ifpdf
-\begin{center}
-\includegraphics[width=8cm]{Modelica_Language}
-\end{center}
-~\\[2\baselineskip]
-\fi
-Modelica\textsuperscript{\textregistered} -- A Unified Object-Oriented Language for Systems Modeling\\[2\baselineskip]
-Language Specification\\[2\baselineskip]
-Version 3.5-dev%
-}
+% Define title for use by LaTeXML.
+% An extended title is defined separately in the 'titlepage'.
+\newcommand{\mlsversion}{3.5-dev}
+\title{Modelica\textsuperscript{\textregistered} Language Specification Version \mlsversion}
 
 \date{\today}
 
@@ -23,14 +16,46 @@
 
 \begin{document}
 % Title
-\maketitle
+% Need to somehow work around the issue that LaTeXML puts the abstract before the title page, see LaTeXML issue:
+% - https://github.com/brucemiller/LaTeXML/issues/1395
+\begin{titlepage}
+% Note that things like \vspace and linebreaks with height (\\[2\baselineskip]) are lost in generated HTML;
+% only line breaks and paragraph breaks survive.
+\addtolength{\parskip}{\baselineskip}% Lots of space between paragraphs on the PDF title page.
+\begin{center}
+\ifpdf
+\includegraphics[width=8cm]{Modelica_Language}
+\else
+\includegraphics[width=15cm]{Modelica_Language}
+\fi
+\vspace{3cm}
+
+\huge
+Modelica\textsuperscript{\textregistered} -- A Unified Object-Oriented Language for~Systems Modeling
+
+Language Specification
+
+Version \mlsversion
+
+\vspace{3cm}% This has no effect in the generated HTML.
+
+\Large
+\makeatletter
+\@date
+
+\@author
+\makeatother
+\end{center}
+\end{titlepage}
+
 % Add new Modelica Language logotype
 % The header ruler looks odd as Modelica Language define a natural line that is further up
 % We also need to fill the vertical space on the right
 % Not using page numbers in right-header, since we usually refer to sections.
 %
 % Using nouppercase since it is seems more normal for the sections, and is also
 % needed for over-determined connectors (as it would otherwise overflow)
+\cleardoublepage
 \pagestyle{fancy}
 \rhead{Modelica Language Specification 3.5-dev\\ \nouppercase{\rightmark} \vspace{1mm}}
 \lhead{\includegraphics[height=6.5mm]{Modelica_Language}}

chapters/abstract.tex

@@ -5,15 +5,6 @@
 % The accepted solution did not seem to work
 \hypersetup{pageanchor=false,bookmarksdepth=2,destlabel=true,bookmarksopenlevel=0}
 \begin{abstract}
-  \ifpdf
-  \else
-  ~\bigskip
-  \begin{center}
-    \includegraphics[width=8cm]{Modelica_Language}
-  \end{center}
-  \bigskip
-  \fi
-
 This document defines the Modelica\footnote{Modelica is a registered
   trademark of the Modelica Association} language, version 3.5, which is
 developed by the Modelica Association, a non-profit organization with