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Yeah, this Linux box has Verdana and Arial too. :)

Besides: we're talking about CSS here. That web page was talking about HTML. I can see old web browsers not supporting "sans-serif".

I think...

I know Arial and Verdana are quite different, but I like both of them and so I put both of them in. :) I didn't design my layout strigently enough that one looks better or worse than the other.
...

You can use something like this CSS (copied from my web site):

font-family: Verdana, Geneva, Helvetica, Arial, sans-serif;
It tries Verdana, then Geneva, etc, and failing all else, whatever...