%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-22 on page I-273 in "The placement of the item label or item text".
%%
%% 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{135.0pt}
\sloppy
%StartShownPreambleCommands
 \usepackage{enumitem}
%StopShownPreambleCommands

\begin{document}
 \begin{description}[leftmargin=*,widest=Short label,nosep]
   \item[Short label]
     and some text to fill more than one line.
   \item[A much longer label]
     and some text to fill more than one line.
 \end{description}
 \begin{itemize}[leftmargin=*,widest=\labelitemi,nosep]
   \item      Bullet flush left.
   \item[---] Dash now protruding.
 \end{itemize}
\end{document}