[Tex/LaTex] Space above chapter with titlesec

chapterssectioningspacingtitlesec

The following code gives me some space above the chapter title, that I'd like to avoid:

\documentclass{book}
\usepackage[showframe]{geometry}
\usepackage{titlesec}
\titleformat{\chapter}[frame]
  {}
  {\thechapter}
  {0pt}
  {}
\titlespacing*{\chapter}{0cm}{0pt}{0pt}[0pt]


\begin{document}
\chapter{Chapter Title}

Fancy text.

\end{document}

See this image:

enter image description here

The ellipse (added afterwards) is above the chapter title, but within the text area.

When I do the same with section instead of chapter, everything is fine:

\documentclass{book}
\usepackage[showframe]{geometry}
\usepackage{titlesec}
\titleformat{\section}[hang]
  {}
  {\thesection}
  {0pt}
  {}
\titlespacing*{\section}{0cm}{0pt}{0pt}[0pt]

\begin{document}
\section{Section Title}

Fancy text.

\end{document}

section with titlesec

What makes \chapter so special in this respect? Is there a way to avoid the space above the chapter title with the package titlesec?

Best Answer

When I go back the amount of \topskip, everything is fine:

\documentclass{book}
\usepackage[showframe]{geometry}
\usepackage{titlesec}

% \topskip 50pt

\titleformat{\chapter}[frame]{}{\thechapter}{0pt}{}
\titlespacing*{\chapter}{0cm}{-\topskip}{0pt}[0pt]

\begin{document}
\chapter{Chapter Title}

Fancy text.

\end{document}

The {-50pt}{40pt} in the linked answer ( https://tex.stackexchange.com/a/63393 ) are not the correct values for the question above.

enter image description here

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