%%
%% The LaTeX Companion, 3ed
%%
%% Example 2-1-3 on page I-31 in "tagging --- Providing variants in the document source".
%%
%% 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}
%StartShownPreambleCommands
\usepackage[doc]{tagging}
%StopShownPreambleCommands

\begin{document}
Environments can contain verbatim material
\begin{taggedblock}{doc} e.g., \verb=#&=\end{taggedblock}
.  \par Note the placement of the period and the spacing!
Careful: \begin{untaggedblock}{doc}
                           Not \end{untaggedblock} shown!
\end{document}