[Tex/LaTex] \titlespacing* defaults using the compact option

sectioningspacingtitlesec

Using the titlesec package with the compact option, what are the \titlespacing* defaults (for \section, \subsection, etc.) for the article document class? (I have the standard defaults from the package documentation but cannot find the compact version…)

Best Answer

Looking at titlesec.sty, one sees:

\DeclareOption{compact}{%
  \gdef\ttl@space{1}%
  \gdef\ttl@chapafter{30\p@}}

the line \gdef\ttl@chapafter{30\p@} simple instructs the usage of 30pt after a chapter title and \gdef\ttl@space{1} indicates 1\beforetitleunit and 1\aftertitleunit for the spacing before and after the tiles, respectively, for lower sectional units, so the compact option corresponds to the values

\titlespacing*{\chapter}
  {0pt}{50pt}{30pt}
\titlespacing*{\section}
  {0pt}{*1}{*1}
\titlespacing*{\subsection}
  {0pt}{*1}{*1}
\titlespacing*{\subsubsection}
  {0pt}{*1}{*1}

The default values for \beforetitleunit and \aftertitleunit are:

\beforetitleunit=1ex\@plus.3ex\@minus.06ex
\aftertitleunit=1ex\@plus.1ex

Related Solutions

[Tex/LaTex] Section and subsection colors using titlesec

The second argument of the \titleformat*{\<name>}{<code>} is stored in a macro called \ttlf@<name> which (default) definition can be printed to the command line with \show\ttlf@<name>, after a \makeatletter of course.

\makeatletter
\show\ttlf@section

\ttlf@section:
macro:->\ttlh@hang {\normalfont \Large \bfseries }{\@seccntformat {section}}{\z
@ }{\ttl@passexplicit }{}. 

\show\ttlf@subsection

\ttlf@subsection:
macro:->\ttlh@hang {\normalfont \large \bfseries }{\@seccntformat {subsection}}
{\z@ }{\ttl@passexplicit }{}. 

\show\ttlf@subsubsection    

\ttlf@subsubsection:
macro:->\ttlh@hang {\normalfont \normalsize \bfseries }{\@seccntformat {subsubs
ection}}{\z@ }{\ttl@passexplicit }{}.

Therefore the correct settings for the requested title formats are:

\titleformat*{\section}{\normalfont\Large\bfseries\color{red}}
\titleformat*{\subsection}{\normalfont\large\bfseries\color{red}}
\titleformat*{\subsubsection}{\normalfont\normalsize\bfseries\color{red}}

Just for completeness here also the settings for \paragraph and \subparagraph:

\titleformat*{\paragraph}{\normalfont\normalsize\bfseries\color{red}}
\titleformat*{\subparagraph}{\normalfont\normalsize\bfseries\color{red}}

[Tex/LaTex] Remove spacing above section in titlesec

UPDATED ANSWER

Do \usepackage[nostruts]{titlesec}, which will remove the struts like my answer below did.

The feature was added with version 2.11, released 2019-07-16.

ORIGINAL ANSWER

The package titlesec adds \strut in some places. In your case you have to defeat this behavior in three places:

\documentclass[11pt]{article}
\usepackage{geometry}
\geometry{margin=5mm, paper=a6paper, showframe=true}

\usepackage{titlesec}
\usepackage{etoolbox}
\makeatletter
\patchcmd{\ttl@select}{\strut}{}{}{}
\patchcmd{\ttlh@hang}{\strut}{}{}{}
\patchcmd{\ttlh@hang}{\strut}{}{}{}
\makeatother

\titleformat*\section{\Large}
\titleformat*\subsection{\large}

\usepackage{lipsum}
\begin{document}

\section*{Using titlesec}
\subsection*{Lorem Ipsum}
\lipsum[3]
\end{document}

The macros involved are \ttl@select and \ttlh@hang (in the second one \strut appears twice. If other styles are selected it may be necessary to patch \ttlh@display or \ttlh@runin.