%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-24 on page I-274 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{159.0pt}

  \addtolength\textwidth{-10pt}   % account for protrusion

  \usepackage{microtype}          % for better line breaking
  \tolerance=2000

%StartShownPreambleCommands
\usepackage{enumitem}
\setlist{first=\hrule,listparindent=10pt,noitemsep}
%StopShownPreambleCommands

\begin{document}
\begin{itemize}[left=5pt]
\item We have 5\,pt space in front of the label.
\par  Here is a second paragraph for comparison.
\end{itemize}
\begin{itemize}[left=0pt..20pt]
\item The item text is 20\,pt indented and the label
  starts flush left.\par  A second paragraph.
\end{itemize}
\begin{enumerate}[left=-10pt..0pt]
\item Outdented label with the text set flush left.
\par  Here is a second paragraph.
\end{enumerate}
\begin{description}[left=-10pt..10pt]
\item[Label] With \texttt{description} this has an
  ugly hole and gives a warning.
\end{description}
\begin{description}[left=-10pt..10pt,labelwidth=!]
\item[Label] Much better now.
\end{description}
\end{document}