Here is a pro-Python propaganda comic. If you’re in to Perl, don’t take the alt tag (by hovering over the image) personally - it’s an xkcd comic. You know, the same comic that depicted Stallman as a ninja? Enjoy! (I know I did.)
http://xkcd.com/224/ ah : p
I always knew that Python programmers were high. Whitespace!
It's not "alt" and it's not a tag. It's a "title" *attribute*. An "alt" attribute generally should not be displayed by a visual browser, and standards-compliant browsers follow this. A "title" attribute on the other hand is displayed as a tooltip, and can be assigned to most elements of the page.
I now, I'm being pedantic. In any case, I enjoyed the comic.