I discovered this by hunting through font-ini.mkii:
On Tue, 21 Feb 2012, Alasdair McAndrew wrote:\definehighlight[emph][style=slanted, color=red]
In some overheads I'm creating, I'd like emphasized text {\em like this} to
appear as red. I hoped that something like this would work:
\setupbodyfontenvironment[default][em={slanted, textcolor=red}]
but it doesn't. What is the canonical way of obtaining red, emphasized,
text?
\emph{...}
Aditya
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