Anyone who has been using CSS for any length of time has probably been frustrated by the lack of selector support in Internet Explorer 6. There are quite a lot of cases where a CSS 2.1 selector will let you target elements in all other relevant browsers, but where you, if you want it to work in IE 6, have to add a class or id attribute to the HTML.
Here are brief explanations of some of the most useful “forgotten” CSS 2.1 selectors.
View site: http://www.456bereastreet.com/archive/201002/forgotten_css_selectors