How can I catch the colors ?

[B�atrice DERBEZ]

Hi gurus!

I'm trying to catch background and foreground color of a frame in mozilla.
when the color is defined in the HTML document via a TAG, I can get it via
the contentNode but
when it is defined via a CSS link, I can't.
I believe the right way is to use the nsStyleContext and inheritance
information but I don't know how
to interpret an d use the mBits value. Perhaps can I use the nsRuleNode
class ?

My primary requirement is to catch foreground and background colors of
mozilla frames.
Please help me to understand the way mozilla works (I'm hacking version
1.2.1)