hookstest2.tex

\documentclass{book}
\usepackage{lipsum}
\usepackage{boxedminipage}
\usepackage{fancyhdr}
\pagestyle{fancy}

\AddToHook{fancyhdr/head/begin}{\bfseries}
\AddToHook{fancyhdr/head/end}{\rlap{\quad\rule{5mm}{5mm}}}
\AddToHook{fancyhdr/foot/begin}{\Large}
\AddToHook{fancyhdr/foot/end}{\rule{0.2mm}{5mm}}

\begin{document}
\chapter{Introduction}

\begin{boxedminipage}{\textwidth}
This is a test for the hooks in fancyhdr headers and footers.

We use a \texttt{fancyhdr/head/begin} hook to set the header bold,
and a \texttt{fancyhdr/head/end} hook to add a black square at the end of the header.

We use a \texttt{fancyhdr/foot/begin} hook to set the footer larger,
and a \texttt{fancyhdr/foot/end} hook to add a vertical bar at the end of the footer.

\end{boxedminipage}

\section{The Problem}
\label{sec:problem}

\lipsum[1]

\section{Evaluation}

\lipsum
\end{document}