IE7 -- Clean up your hack!

Prior to IE6, browsers built in non-standard rendering, without conforming to W3C recommendations With wider acceptance of standards, browsers began to operate in two modes – a ‘quirky’ mode called Quirks mode and a ‘standards’ mode. The former was used to support legacy pages. Quirks mode gets triggered if no DOCTYPE declaration is made at the start of a page. IE6 under Quirks mode does not make any behavioral changes. i.e. existing pages render unmodified. Under the STRICT DOCTYPE, IE7 will change behavior to be compliant with web standards (as far as possible). This is because IE7 has introduced new CSS functionality causing several CSS hacks to fail. In the IE blog on MSDN, the IE7 team recommends you review the following CSS hacks: html > body , * html - , head:first-child + body, head + body and body > element. (Note: An early preview of IE7 was given to PDC attendees and MSDN subscribers).