All I can say is: Guilty as charged! This is one issue I'm working on, as well as making both the MC++ FAQ and this weblog pages be XHTML compliant, but it's not as easy as I thought it would be. The fact that dealing with relative font sizes in IE is a pain in the butt doesn't help, specially with Verdana as the font... [Commonality]

The font-family should not matter. Just make sure to use the em length unit in your font-size attribute and you should be all set. Either that or use the relative-size keywords (i.e. small, large, x-large, etc.).