# Spacing in \chaptertitlename

Consider the following MWE:

\documentclass{book}
\usepackage{titlesec}
\usepackage{lipsum} % just to generate text for the example
\usepackage[tracking=smallcaps]{microtype}

\titleformat{\chapter}[display]
{\bfseries\Large}
{\filright\MakeUppercase{\chaptertitlename} \Huge\thechapter}
{1ex}
{\titlerule\vspace{1ex}\filleft}
[\vspace{1ex}\titlerule]

\begin{document}

\chapter{Test Unnumbered Chapter}
\lipsum[1-2]
\chapter{Test Numbered Chapter}
\lipsum[1-2]
{\scshape Test}
\end{document}


How can we edit the \chaptertitlename command so that it spaces out correctly by using the microtype package?

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Putting it into a \textls{...} spaces it out.

\documentclass{book}
\usepackage{titlesec}
\usepackage{lipsum} % just to generate text for the example
\usepackage[tracking=smallcaps]{microtype}

\titleformat{\chapter}[display]
{\bfseries\Large}
{\filright\textls{\MakeUppercase{\chaptertitlename}} \Huge\thechapter}
{1ex}
{\titlerule\vspace{1ex}\filleft}
[\vspace{1ex}\titlerule]

\begin{document}

\chapter{Test Unnumbered Chapter}
\lipsum[1-2]
\chapter{Test Numbered Chapter}
\lipsum[1-2]
{\scshape Test}
\end{document}


The result is a fine example of why even wonderful microtype, or any other automatic way of letterspacing currently available in *TeX, is unsuitable for creating letter-spaced all-caps that actually look good. That's because TeX has no knowledge of what a given letter looks like. So in letterspacing, an A is treated the same as a V or an O, which obviously isn't how it's done. That's why in TeX, we can't have, e.g., optical kerning -- which would be pretty handy here.

In this case, there's no need to worry, though. Larger text usually benefits from tighter spacing. Large all-caps you can simply leave at default spacing IMHO.

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