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JavaScript
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// ----------------------------------------------------------
// A short snippet for detecting versions of IE in JavaScript
// without resorting to user-agent sniffing
// ----------------------------------------------------------
// If you're not in IE (or IE version is less than 5) then:
// ie === undefined
// If you're in IE (>=5) then you can determine which version:
// ie === 7; // IE7
// Thus, to detect IE:
// if (ie) {}
// And to detect the version:
// ie === 6 // IE6
// ie > 7 // IE8, IE9 ..., false for non-IE
// ie < 9 // Any IE less than IE9, false for non-IE
// ----------------------------------------------------------
// Made it JSLint friendly
 
var ie = (function () {
var u,
v = 3,
b = document.createElement('b'),
i = b.getElementsByTagName('i');
do {
v += 1;
b.innerHTML = '<!--[if gt IE ' + v + ']><i></i><![endif]-->';
} while (i[0]);
return v > 4 ? v : u;
}());

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