%%
%% The LaTeX Companion, 3ed
%%
%% Example 6-7-8 on page I-480 in "diagbox --- Making table cells with diagonal lines".
%%
%% 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{171.0pt}

%StartShownPreambleCommands
\usepackage{diagbox}
%StopShownPreambleCommands

\begin{document}
\begin{tabular}{|c|c|c|}                    \hline
 \diagbox{column}{table}{row info} & H2  \\ \hline
  R1 & a wide cell C1,2                  \\ \hline
  R2 & \diagbox{C}{2,2}                  \\ \hline
  R3 & \diagbox[height=18pt]{C}{3,2}     \\ \hline
  R4 & \diagbox[height=15pt, width=\widthof{a
                wide cell C1,2}]{C}{4,2} \\ \hline
\end{tabular}
\end{document}