%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-1-9 on page I-129 in "Package options".
%%
%% 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{324.0pt}

%StartShownPreambleCommands

\usepackage[protrusion=false,stretch=500,verbose,selected]{microtype}
\usepackage{calc}
\newcommand\samplet{Stretching or shrinking text too much is a bad idea!}
\newcommand\sample[2]{\parbox{\widthof{\samplet}+#1}
  {\setlength\parfillskip{0pt}\samplet}\hfill \textit{#2}\par}

%StopShownPreambleCommands

\begin{document}
%  \sample{-7pt} {-5\%}
  \sample{-4.2pt}{-3\%}
  \sample{-2.8pt} {-2\%}
  \sample{0pt}  {(natural)}
  \sample{2.8pt}  {2\%}
  \sample{4.2pt}{3\%}
  \sample{7pt}  {5\%}
  \sample{21.2pt}  {15\%}
\end{document}