CSS Hack compatibility table

	IE6	IE7	IE8	Firefox	Opera	Safari
!important		Y	Y	Y	Y	Y
_	Y
*	Y	Y
*+		Y
\9	Y	Y	Y
/			Y
Nth-of-type (1)					Y	Y

Example :

. test{

Background: #f00; //Every browser knows

Background:blue\0; //IE10, 9, 8 recognize

background:red\9; //All IE are aware of

Background: #F60 \0\9; //Only IE 8 know written as \0\9 or \9\0

+background:yellow; //IE6, 7 recognize, plus + and asterisk * Same effect

_background:black; // only IE6 know

}

: Root. test{background:blue\9;} // only IE9 know

Detailed reference: http://baike.baidu.com/view/1119452.htm

CSS hack compatibility table