\setupoutput[pdftex]

\defineblock[Ablok]
\defineblock[Bblok]

\setupbodyfont[ber,ppl,12pt]

\setupblock[Ablok][style=slanted]% small, bold, type

\starttext

\beginAblok
This is A-block slanted
\endAblok

\beginBblok
This is B-block normal
\endBblok



\stoptext
