\environment columnsets-000

\definecolumnset[example][n=4,page=left]

\setupcolumnset
  [example]
  [background=contrast,
   backgroundoffset=4pt,
   frame=on,
   framecolor=white,
   rulethickness=2pt]

\definecolor[fakerulecolor][white]

\starttext

\startcolumnset[example]

  \dorecurse{30}{\fakewords{50}{100}\par}

\stopcolumnset

\stoptext
