Member Rara Avis
When you use an HTML font tag, you are suggesting which font you would like the visitor's browser to use. The fonts aren't loaded across the Internet, but have to ALREADY exist on your machine. Otherwise, the browser will ignore the request. Almost every computer comes with a few standard fonts, but most of the ones you have on your computer were probably loaded by an application like MS Word or PhotoShop. The end result is that, other than the few standards, just about everyone has a different selection of fonts available. That's why our posting page has only a few selections. When you type in your own, like Century Gothic, you are "hoping" others have it, too. Not everyone will.
If you're typing in the font tag for Century Gothic and not seeing it, one of two things are happening. Either you're not getting the name right (it has to be exact), or you computer just doesn't have that font available.