%%
%% The LaTeX Companion, 3ed
%%
%% Example 2-2-10 on page I-41 in "The basic interface".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{231.0pt}
%StartShownPreambleCommands
\usepackage{lipsum,titlesec}

%StopShownPreambleCommands

\begin{document}
\section{A very long heading that
         shows the default behavior of
         \LaTeX's sectioning commands}
\lipsum[3][1-2]
\end{document}