The color red can be also specified as
EM { color: rgb(255, 0, 0) } /* integers between 0 and 255 */
EM { color: rgb(100%, 0%, 0%) } /* floats between 0.0 and 100.0 */\
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BTW, the "floating point" rgb() notation example above is incorrect. It's a known content bug that we should have fixed shortly. It might have worked once in IE4 before CSS standardization, but it certainly isn't a recognized format in either IE6 or IE7. (jsudds)