Yes, you can reference system properties in your CSS. I know this works well with colors, not sure about fonts.
You just need to reference it like this:
<style type="text/css"> body { font-family: InfoText; color: ButtonText; background-color: ButtonFace; } </style>
EDIT: With a little thought, I think this will work with fonts as well, but not with the way you referenced it with a dialog font . You simply refer to the system property, as well as to the other two, and the font defined for this property will be indicated on it.
Second EDIT: Here is a blog with a list of available properties, as well as more information than fonts:
How to use operating system styles in CSS
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