%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-5-12 on page I-213 in "footmisc --- Various footnotes styles".
%%
%% 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}
\setlength\textheight{7\baselineskip}
\addtolength\textwidth{-10pt} %account for marginal space in example
%StartShownPreambleCommands
\usepackage[marginal]{footmisc}
\newcommand\sampletext{Some text\footnote{A first.}
 with a footnote. More text.\footnote{A second
  footnote with a few lines of text to show
  variations in the footnote line-breaking behavior.}
 Even more text.\footnote{A third note.}
 Some final text.}
%StopShownPreambleCommands

\begin{document}
\sampletext
\end{document}