\documentclass[a4paper]{article}

\usepackage{amsmath}

\begin{document}
\section{Section title}     % font-latex-sectioning-5-face
\label{section-label}
Some ``regular''                % font-latex-string-face
text $a_x$                      % font-latex-math-face
\begin{verbatim}                %
This is verbatim text.          % font-latex-verbatim-face
\end{verbatim}
Some \-                         % font-latex-warning-face
\underline{math}?               % font-latex-underline-face
\begin{align}                   % font-latex-math-face
  \label{eq:1}
  \int \text{\textbf{this} is a  % font-latex-bold-face
  formula} &\mathrm{a}_b^c\alpha % font-latex-{sub,super}script-face
  \\
\end{align}
\appendix                       % font-latex-sedate-face
This is the end.
\end{document}

%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End: