The CSS 2.1 stuff in my user-defined styleSheet fails.

I'veÂ*got a user-defined styleSheet ( JeffRelf.F-M.FM/userContent.CSS )
that works well for me when using FireFox 3.
screenShot of “ Google.COM/groups?q="Jeff"*"Relf"&scoring=d �:

JeffRelf.F-M.FM/GGSearch.PNG

I'd like to make all, or most of it, work in IE8.

Does IE8 have anything like:
“ @-moz-document url-prefix(http), url-prefix(file) { .... } � ?

Although I'm viewing pages in “ IE8 Standards Mode �,
the CSS 2.1 stuff in my user-defined styleSheet fails, e.g.:

p:before { content: "XX" !Important; }
span[class] { color: RGB( 255, 0, 0 ) !Important; }

In other words, it's acting like every page is in quirks mode,
or “ IE5 standards Mode â€�. I'mÂ*using IE8-RC1 on Vista SP1.
I checked “ Format Documents using my style sheet �.