Actually, maybe my version is a bit old: context --version returns 2011.05.18 18:04.  I'll try to update it.  (I'm using Ubuntu 12.04, but when I tried to update using apt-get the system told me that I had the latest version).  In the meantime I'll try your alternative.

Thanks!


On Fri, Mar 1, 2013 at 12:40 AM, Marco Patzer <homerow@lavabit.com> wrote:
On 2013–03–01 Alasdair McAndrew wrote:

> Do I have to include a special module here?

No. I tested some versions between 2011.11.29 23:11 and 2013.02.26
00:17 and it worked for me. Which version are you using?
\definehighlight is nothing which was recent added.

\setupbodyfontenvironment
  [default]
  [em=slantedred]

\definehighlight
  [slantedred]
  [style=slanted,
   color=red]

\starttext
  foo {\em bar}
\stoptext

You cannot update, you can try this instead of \definehighlight:

\definealternativestyle
  [slantedred]
  [{\slanted\color[red]}]


Marco

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