\usetypescriptfile[type-vista]

\definetypeface [cambria] [rm] [serif] [cambria] [default]

\setupbodyfont[cambria,11pt]

\starttext

\chapter{beginning}
{\rm Text Va ffi ffi fi fl {\Var[sc] ABC abc} {\Var[osf] 123}123}

{\bf Text Va ffi ffi fi fl {\Var[sc] ABC abc} {\Var[osf] 123}123}

{\it Text Va ffi ffi fi fl {\Var[sc] ABC abc} {\Var[osf] 123}123}

{\bi Text Va ffi ffi fi fl {\Var[sc] ABC abc} {\Var[osf] 123}123}

\chapter{body--font}
\showbodyfont

as shown above the body---font is kind of like a body--font and body-font.
\startlines
body---font
body--font
body-font
body||font

1---3
1--3
1-3
1||3
\stoplines

\chapter{Knuth}
   \dorecurse{12}
     {\rm\input knuth\par}

\chapter{Tufte}
   \dorecurse{12}
     {\ss\input tufte\par}

\chapter{Zapf}
   \dorecurse{12}
     {\it\input zapf\par}

\chapter{Knuth}
   \dorecurse{12}
     {\bf\input knuth\par}

\chapter{Tufte}
   \dorecurse{12}
     {\bi\input tufte\par}

\chapter{Zapf}
   \dorecurse{12}
     {\sl\input zapf\par}

\dorecurse{4}
  {\chapter{Knuth}
   \dorecurse{12}
     {\bs\input knuth\par}}

\chapter{Tufte}
   \dorecurse{12}
     {\sc\input tufte\par}

\dorecurse{4}
  {\chapter{Zapf}
   \dorecurse{12}
     {\bf\sc\input zapf\par}}

\stoptext