\setuppapersize [A5][A4] \setuplayout [backspace=1cm,width=.7\paperwidth, topspace=1cm,height=.7\paperheight, location=middle,marking=on] \setuppagenumbering [alternative=doublesided] \setupbodyfont [lbr,6pt] \setupheadertexts [alfa][beta] \showframe \starttext \dorecurse{10}{\input tufte \par \input knuth \par} \stoptext