\usemodule[visual]

\setuplayout[width=fit,height=fit,backspace=10mm,cutspace=10mm,topspace=10mm,margin=10mm,header=10mm,footer=10mm]
\setuppagenumbering[location={header,right},style=\bfb]


\starttext


\definecolumnset[pageThree][n=3,page=left]
\definecolumnsetspan[spanTwo][n=2,background=color,backgroundcolor=darkgray]
\startcolumnset[pageThree]
\fakewords{25}{50}
\startcolumnsetspan[spanTwo]
\fakewords{25}{50}
\stopcolumnsetspan
\dorecurse{2}{\fakewords{220}{230}\par}
\stopcolumnset

\stoptext