%%
%% The LaTeX Companion, 3ed
%%
%% Example 9-6-8 on page I-714 in "Scaling fonts".
%%
%% 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{99.0pt}

  %!TEX program = lualatex

%StartShownPreambleCommands
\usepackage{fontspec}
\setmainfont{TeX Gyre Termes}                         % Times
\setsansfont{TeX Gyre Heros}[Scale=MatchLowercase]    % Helvetica
\setmonofont{Latin Modern Mono}[Scale=MatchLowercase] % LM Mono
%StopShownPreambleCommands

\begin{document}
A sample text \textsf{mixing Sans}, \texttt{Typewriter},
and Roman in one sentence.
\end{document}