showstruts.tex

\documentclass[twoside]{article}

\usepackage{boxedminipage}
\usepackage{fancyhdr}
\usepackage{lipsum}
\pagestyle{fancy}
\fancyhead[LE,RO]{%
  \texttt{\textbackslash strut}:
  \rule[-0.3\normalbaselineskip]{10pt}{0.3\normalbaselineskip}%
  \rule{10pt}{0.7\normalbaselineskip}
  \texttt{\textbackslash headruleskip}$\searrow$
  \raisebox{-0.3\normalbaselineskip}[0pt][0pt]%
  {\ifdim \headruleskip>0pt
    \rule[-\headruleskip]{10pt}{\headruleskip}
  \else
    \rule{10pt}{-\headruleskip}
  \fi}
}
\fancyfoot[LE,RO]{%
  \setbox0=\hbox{%
    \texttt{\textbackslash strut}:
    \rule[-0.3\normalbaselineskip]{10pt}{0.3\normalbaselineskip}%
    \rule{10pt}{0.7\normalbaselineskip}
    \texttt{\textbackslash footruleskip} $\nearrow$
    \rule[0.7\normalbaselineskip]{10pt}{\footruleskip}}%
  \ht0=0pt%
  \box0
}
\renewcommand{\footrulewidth}{0.4pt}
\renewcommand{\headruleskip}{4pt}

\begin{document}
\section{Introduction}
\label{sec:introduction}

\noindent
\begin{boxedminipage}{\textwidth}
This is \texttt{showstruts}.
This document shows the struts in the headers and footers, as well as \verb|\headruleskip| and \verb|\footruleskip|.

\begin{verbatim}
\fancyhead[LE,RO]{%
  \texttt{\textbackslash strut}:
  \rule[-0.3\normalbaselineskip]{10pt}{0.3\normalbaselineskip}%
  \rule{10pt}{0.7\normalbaselineskip}
  \texttt{\textbackslash headruleskip}$\searrow$
  \raisebox{-0.3\normalbaselineskip}[0pt][0pt]%
  {\ifdim \headruleskip>0pt
    \rule[-\headruleskip]{10pt}{\headruleskip}
  \else
    \rule{10pt}{-\headruleskip}
  \fi}
}
\fancyfoot[LE,RO]{%
  \setbox0=\hbox{%
    \texttt{\textbackslash strut}:
    \rule[-0.3\normalbaselineskip]{10pt}{0.3\normalbaselineskip}%
    \rule{10pt}{0.7\normalbaselineskip}
    \texttt{\textbackslash footruleskip} $\nearrow$
    \rule[0.7\normalbaselineskip]{10pt}{\footruleskip}}%
  \ht0=0pt%
  \box0
}
\renewcommand{\footrulewidth}{0.4pt}
\renewcommand{\headruleskip}{4pt}
\end{verbatim}

\end{boxedminipage}

\bigskip

\lipsum

\end{document}