Hello,
In the manual, there is the macro below.
Why the word "Matrice" is not on the same baseline as the number "1" ?
thank you,
Fabrice

\unexpanded\def\HeadTitle#1#2%
  {\hbox to \hsize \bgroup
   \setupframed[height=1cm,offset=0.5em,frame=on]
   \framed[width=fit,align=left]{\darkred#1}%

\framed[width=fit,align=right,leftframe=on,rulethickness=4pt,framecolor=darkred]{#2}%
    \egroup}

\setuphead
   [chapter]
   [command=\HeadTitle]

\starttext

\startchapter
  [title={Matrice}]


\stopchapter

\stoptext