It's been a while since I've done much HTML work, but I had no idea that I'd missed the boat. Apparently a good chunk of HTML elements and attributes have been deprecated.
This is fine by me, as I'm taking a few minutes to learn hard-core CSS (goodbye, tables!), but the few of you that don't need to support Navigator 2.x anymore may want to check out the following link.
Good riddance, width attribute when used in an hr, pre, td or th tag!
Deprecated HTML tags and alternatives