% example by Andreas Harder

\setuplayout[header=\lineheight,headerdistance=\lineheight]
\setupinterlinespace[line=18pt]
\setupdelimitedtext[blockquote][style={\tfx\setuplocalinterlinespace[line=2.8ex]}]
\setupheader[style=\tfxx]

\setupheadertexts[chapter][section] % try this
% \setupheadertexts[\setups{head}]  % or this

\startsetups[head]
  \framed
    [width=broad,strut=yes,height=\lineheight,framecolor=red]
    {\getmarking[chapter]\hfill\getmarking[section]}
\stopsetups

\starttext  \showstruts  \showframe[text]
\chapter{ÄÖÜy}  \section{ÄÖÜy}
\dorecurse{3}{
  \dorecurse{3}{\input tufte \par}
  \startblockquote
    \dorecurse{3}{\input tufte \par}
  \stopblockquote
}
\stoptext
