CSS Differences
•1.  IE7 understands the child selector
Html>body
–IE 6 ignores the child selector so hacks can be used to:
•Hide CSS from IE6
•Deliver different CSS to IE6
•2.  IE7 does not understand the * html hack
* Html
–Wildcard that means rule applies to every nested element
–Shows some CSS to IE 6 but not other browsers
•Both hacks will not work for IE7