% \definefontfeature[default][default][mode=node,mark=yes,mkmk=yes]
\definefontsynonym[a][file:LucidaBright.otf][features=default]

\starttext

    \enabletrackers[nodes.injections,fonts.automode]

    \definedfont[a]

    a\ruledhbox to 1cm{}\ruledhbox to 1cm{U\char"032F}a

    U\char"032F

    \disabletrackers[nodes.injections,fonts.automode]

\stoptext
