Methods of CSS hack

For example: height:100px; IE6 Special _height:100px; IE7 Special *+height:100px; IE6, IE7 common use *height:100px;  IE7, FF shared with height:100px!important; If condition hack 1. <!--[if! ie]><!--> In addition to IE can be recognized <!--<! [endif]--> 2. <!--[if ie]> all IE recognizable <! [endif]--> 3. <!--[if IE 6]> only IE6 recognizable <! [endif]--> 4. <!--[if Lt IE 6]> IE6 and IE6 The following versions are recognized <! [endif]-->5.<!--[If Lt IE 7]> IE7 and IE7 The following versions are recognized <! [endif]--> 6.<!--[if GTE IE 7]> IE7 and IE7 are recognized <! [endif]-->

Methods of CSS hack