QT그리고···

Item	Example	Comment
IE	[if IE]	The only currently supported feature is the string "IE", corresponding to Internet Explorer.
value	[if IE 7]	An integer or floating point numeral corresponding to the version of the browser. Returns a Boolean value of true if the version number matches the browser version. For more information, see Version Vectors.
!	[if !IE]	The NOT operator. This is placed immediately in front of the feature, operator, or subexpression to reverse the Boolean meaning of the expression.
lt	[if lt IE 5.5]	The less-than operator. Returns true if the first argument is less than the second argument.
lte	[if lte IE 6]	The less-than or equal operator. Returns true if the first argument is less than or equal to the second argument.
gt	[if gt IE 5]	The greater-than operator. Returns true if the first argument is greater than the second argument.
gte	[if gte IE 7]	The greater-than or equal operator. Returns true if the first argument is greater than or equal to the second argument.
( )	[if !(IE 7)]	Subexpression operators. Used in conjunction with boolean operators to create more complex expressions.
&	[if (gt IE 5)&(lt IE 7)]	The AND operator. Returns true if all subexpressions evaluate to true
|	[if (IE 6)|(IE 7)]	The OR operator. Returns true if any of the subexpressions evaluates to true.
true	[if true]	Always evaluates to true.
false	[if false]	Always evaluates to false.

사용방법 : 아래처럼 IE외 브라우저용 CSS를 사용하고 밑에 IE용 CSS를 사용..
<link rel="stylesheet" type="text/css" href="basic.css" />
<link rel="stylesheet" type="text/css" href="editor.css" />
<link rel="stylesheet" type="text/css" href="post.css" />
<!--[if IE]>
<link rel="stylesheet" type="text/css" href="basic.ie.css" />
<link rel="stylesheet" type="text/css" href="editor.ie.css" />
<link rel="stylesheet" type="text/css" href="post.ie.css" />
<![endif]-->




다른 예제들..

<!--[if IE 5]>
<p>Welcome to Internet Explorer 5.</p>
<![endif]-->



<!--[if gte IE 5]>
<SCRIPT LANGUAGE="Javascript">
alert("Congratulations! You are running Internet Explorer 5 or greater.");
</SCRIPT>
<P>Thank you for closing the message box.</P>
<![endif]-->



<![if lt IE 5]>
<p>Please upgrade to Internet Explorer version 5.</p>
<![endif]>



<!--[if !IE]>--> HTML <!--<![endif]-->



<!--[if IE 7]><!--> HTML <!--<![endif]-->



<!--[if IE 5]>
<p>Welcome to any incremental version of Internet Explorer 5!</p>
<![endif]-->



<!--[if IE 5.0]>
<p>Welcome to Internet Explorer 5.0!</p>
<![endif]-->



<!--[if IE]><p>You are using Internet Explorer.</p><![endif]-->
<![if !IE]><p>You are not using Internet Explorer.</p><![endif]>

<!--[if IE 7]><p>Welcome to Internet Explorer 7!</p><![endif]-->
<!--[if !(IE 7)]><p>You are not using version 7.</p><![endif]-->

<!--[if gte IE 7]><p>You are using IE 7 or greater.</p><![endif]-->
<!--[if (IE 5)]><p>You are using IE 5 (any version).</p><![endif]-->
<!--[if (gte IE 5.5)&(lt IE 7)]><p>You are using IE 5.5 or IE 6.</p><![endif]-->
<!--[if lt IE 5.5]><p>Please upgrade your version of Internet Explorer.</p><![endif]-->

<!--[if true]>You are using an <em>uplevel</em> browser.<![endif]-->
<![if false]>You are using a <em>downlevel</em> browser.<![endif]>

<!--[if true]><![if IE 7]><p>This nested comment is displayed in IE 7.</p><![endif]><![endif]-->


http://msdn2.microsoft.com/en-us/library/ms537512.aspx




JS에서 Conditional Comments 사용하기는 아래 링크..

ex1. var isMSIE/*@cc_on=1@*/;

ex2. var isMSIE = /*@cc_on!@*/false;


http://dean.edwards.name/weblog/2007/03/sniff/