How to put section at a title of colorbox and the text at the box itself?

Question

As a continue to this answer: https://tex.stackexchange.com/a/226751/29476
I want to know if there is an option to make something like this:

That the title will be the section number and name and the body of the section will be at the body of the colorbox. Of course using titlesec:

\titleformat{<command>}[<shape>]{<format>}{<label>}{<sep>}{<before-code>}[<after-code>]

This is possible?

Thank you!!

(P.S. If not tcolorbox - mdframed is OK)

Answer 1

This is an easy example with automatic addition to table of contents, nearly from the manual. As you can see you will also be able to mix ordinary sections with tcolorboxed sections.

Just to explain why your titlesec approach is very hard to implement: LaTeX (as opposed to ConTeXt) does not know the point a section really ends, so it cannot determine where the body of the environment should end. That's why this answer uses an explicit environment to work around this issue.

\documentclass{article}
\usepackage{tcolorbox}
\tcbuselibrary{breakable}
\newtcolorbox[auto counter, use counter=section, list type=section, list inside=toc]{sectionbox}[1]{colback=red!5!white, colframe=red!75!black, fonttitle=\bfseries, title={\thetcbcounter\ #1}, list entry={\thetcbcounter\quad #1}, breakable}

\begin{document}
    \tableofcontents

    \begin{sectionbox}{Test}
        Test
    \end{sectionbox}
    \section{Test}
    \begin{sectionbox}{Test}
        Test
    \end{sectionbox}
\end{document}