Wait, it gets funnier. Over on my e-books site, one style sheets consists of a single line, which says in its entirety
Why? Because it's an easy way to illustrate proofreading markup and make it stand out. You can't make your own styles, because Project Comments (Technical Term) are inserted into a page that's constructed behind the scenes in php. Same mechanics as a Forums post, come to think of it. So it's either inline CSS or ::shudder:: <font> tags galore.
Needless to say we were not happy to hear that HTML 5 is doing away with <tt> ;)