\usemodule[visual]

\defineoverlay[behind][{\blackrule[height=2cm,width=8cm,color=yellow]}]
\defineoverlay[before][{\blackrule[height=8cm,width=2cm,color=orange]}]
\setupbackgrounds[page][background={behind,foreground,before}]


\starttext
\fakewords{200}{260}

\page
\setupbackgrounds[page][background=]
\fakewords{200}{260}




% \framed
%   [width=10cm,
%    height=10cm,
%    background={color,behind,before,foreground},
%    backgroundcolor=red]
%   {AAA}

\stoptext