> Use text backgrounds.
>
> \definetextbackground
>   [SummaryBackground]
>   [frame=off,
>    background=color,
>    backgroundcolor=gray]
>
> \definehead[summary][section]
>
> \setuphead
>   [summary]
>   [before=,
>    beforesection={\blank\starttextbackground[SummaryBackground]},
>    aftersection={\stoptextbackground\blank}]
>
> \starttext
>
> \startsection[title=Knuth]
>
> \input{knuth}
>
> \stopsection
>
> \startsummary[title=Zapf]
>
> \input{zapf}
>
> \stopsummary
>
> \stoptext
>
> Wolfgang

Hello Wolfgang,

Your example works. After adjusting the \summary to using \startsummary,
\stopsummary, and using your code, with only minor additions, as below:

\definetextbackground
  [SummaryBackground]
  [frame=off,
   background=color,
   backgroundcolor=gray,
   backgroundoffset=2ex] % <- added

\definehead[summary][section]

\setuphead[summary]
    [number=no,     % <- added
    style=bold,     % <- added
    before=,
    beforesection={\page\starttextbackground[SummaryBackground]}, % <-
changed \blank to \page
    aftersection={\stoptextbackground\page}] % <- changed \blank to \page

I get some unwanted result. See the picture.

The bold does not show up, and a small portion of the topleft corner of
the background frame is missing....

Changing bold to italic also has no effect.

Something strange....

Also trying with \blank instead of \page, the background then starts right
after the previous section, and it seems the indentation causes the
missing background on the first line.

So I placed "\noindentation\page" into beforesection (replacing \blank)
and get the background result I want, but still the bold is missing in the
summary title, and too much whitespace appears before the section title.

The title should be placed in the same position as normal text would
appear (and as a side note: in fact I am copying a style that was used in
a printed book that I typeset, in which each section title - except for
the summary - is just a normal sentence (or 2) typeset bold, with the rest
of the text appearing after the section title just as after a normal
sentence, so no vertical space between title and first sentence of the
section. Since it appears in the content also, I had to use section
commands, but is this behaviour duplicatable using setuphead for section?)


How can I adjust that?

Greetings,

Rob

(my context version is  2014.12.03 18:26)