Source Browser ?

1\environment columnsets-000
2
3\definecolumnset[example][n=3,page=left,distance=1cm]
4
5\setupcolumnset
6  [example]
7  [background=contrast]
8
9\definecolor[fakerulecolor][white] \faketriggertrue
10
11\setuphead
12  [section]
13  [style=\bfd]
14
15\setuplinenumbering
16  [style=bold,
17   distance=0pt,
18   align=inner]
19
20\starttext
21
22\startcolumnset[example]
23
24  \dorecurse{30}{
25    \startsection[title=foo #1]
26      \startlinenumbering
27        \fakewords{50}{100}\par
28      \stoplinenumbering
29    \stopsection
30  }
31
32\stopcolumnset
33
34\stoptext
35