It is worth knowing every HTML tag and CSS property. It will help you build pages more efficiently. The quiz in the link above, and in the big green box on the left, is a great way to test your memory.

Learn all the CSS properties as well. http://www.oneplusyou.com/bb/css_quiz

Check the answers you missed to find out what they are. Be careful, some have been deprecated for XHTML.

It’s also Fun!