\setupbodyfont[dejavu]
% \setupbodyfont[lucidaot]

\starttext

\startbuffer
\starttabulate[|l|c|c|]
    \NC precomposed \NC \char"00EB           \NC ë  \NC \NR
    \NC decomposed  \NC \char"0065\char"0308 \NC ë \NC \NR
\stoptabulate
\stopbuffer

\definefontfeature[composed][default][tcom=yes]

\typebuffer

\subject{tcom=no}  {\definedfont[Normal*default]  \getbuffer}
\subject{tcom=yes} {\definedfont[Normal*composed] \getbuffer}

\stoptext
