CSS hack:区分IE6,IE7,firefox

区别不同浏览器,CSS hack写法:

区别IE6FF
background:orange;*background:blue;

区别IE6IE7
background:green !important;background:blue;

区别IE7FF
background:orange; *background:green;

区别FFIE7IE6
background:orange;*background:green !important;*background:blue;

注:IE都能识别*;标准浏览器(如FF)不能识别*;
IE6能识别*,但不能识别 !important,
IE7能识别*,也能识别!important;
FF不能识别*,但能识别!important;

IE6 IE7 FF
* ×
!important ×