Hello list mavens,

What are the circumstances under which style=italicface should be used 
instead of style=italic. I note a difference when I define highlighting. 
I expected to see no difference in the line before and line after the 
hairline the example below, but see that italicface adapts to nesting, 
while italic does not:

Are there other places where this makes a difference?

    \setupbodyfontenvironment
             [default]
             [em=italicface] %same with italic for this example
    \definehighlight
             [emIt]
             [style=italic]
    \definehighlight
             [emIf]
             [style=italicface]
    \definehighlight
             [emEm]
             [style=\em]

    \starttext

    {\em abc {\em def} ghi}: \type{\em}

    \emph{abc {\emph def} ghi}: \type{\emph}

    \emEm{abc {\emEm def} ghi}: \type{\emEm \definehighlight[style=\em]}

    \emIf{abc {\emIf def} ghi}: \type{\emIf
    \definehighlight[style=italicface]}

    \hairline

    \emIt{abc {\emIt def} ghi}: \type{\emIt \definehighlight[style=italic]}

    \stoptext

-- 
Rik