Hi, please have a look at this:
\setupbodyfontenvironment[default][em=italic]
\setupbodyfont[gentium,rm,12pt]
\starttext
\samplefile{knuth}
\emph{\samplefile{knuth}}
\samplefile{knuth}
{\sl\samplefile{knuth}}
\samplefile{knuth}
\stoptext
The gentium fontscript is using the fake slanted feature, and that looks
seriously broken: While the font is displayed ultra compressed, it
apparently gets calculated correctly.
Hraban
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