1 October 2007 - 22:50invalid xhtml elements

Today design a site underl w3c xhtml rule.some elements offten make mistakes.

1. In url “&” must change to “&”
2. <h2></h2> between them you can include other elements like <a>, but you can include <h2> in tags <a>.
3. like <ul></ul>, you must include child elements in them, or there would be a error.
4. you must close all of the tags.