区别IE6与FF：
background:orange;*background:blue;
区别IE6与IE7：
background:green !important;background:blue;
区别IE7与FF：
background:orange; *background:green;
区别FF，IE7，IE6：
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 |
× |
√ |
√ |
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