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.test {
background-color: black; /* firefox, opera, ie8 */
[;background-color: green;] /* safari, chrome */
*background-color: blue; /* ie7 */
_background-color: red; /* ie6 */
}
html*~/**/body .test {
border: 5px solid red; /* ie8 */
}
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<!--[if lt IE 7 ]><body class="ie6"><![endif]-->
<!--[if IE 7 ]><body class="ie7"><![endif]-->
<!--[if IE 8 ]><body class="ie8"><![endif]-->>
<!--[if !IE]>--><body><!--<![endif]-->
<style type="text/css">
body.ie6 .test { background-color: blue }
body.ie7 .test { background-color: red }
body.ie8 .test { background-color: green }
</style>
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//Initialize doc classes
(function(){
var initExtCss = function(){
// find the body element
var bd = document.body || document.getElementsByTagName('body')[0];
if(!bd){ return false; }
var cls = [' ',
Ext.isIE ? "ext-ie " + (Ext.isIE6 ? 'ext-ie6' : (Ext.isIE7 ? 'ext-ie7' : 'ext-ie8'))
: Ext.isGecko ? "ext-gecko " + (Ext.isGecko2 ? 'ext-gecko2' : 'ext-gecko3')
: Ext.isOpera ? "ext-opera"
: Ext.isWebKit ? "ext-webkit" : ""];
if(Ext.isSafari){
cls.push("ext-safari " + (Ext.isSafari2 ? 'ext-safari2' : (Ext.isSafari3 ? 'ext-safari3' : 'ext-safari4')));
}else if(Ext.isChrome){
cls.push("ext-chrome");
}
if(Ext.isMac){
cls.push("ext-mac");
}
if(Ext.isLinux){
cls.push("ext-linux");
}
if(Ext.isBorderBox){
cls.push('ext-border-box');


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CSS hack:Çø·ÖIE6£¬IE7£¬firefox


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