% Put a bit of space betwen paragraphs, to make them easier to distinguish.
\setupwhitespace[small]
+% Only show three levels in the table of contents. Passing level= to
+% setupcombinedlist didn't seem to work, so we'll do it like this.
+\definecombinedlist [content][chapter,section,subsection]
% Use the c alternative for the toc, which uses dots between the section
% name and the page number.
\setupcombinedlist [content][alternative=c]