<!--[if gte IE 7]> //gte means >= IE7
<link rel="stylesheet" type="text/css" href="/stylesheets/ie.css" />
<p>Both Internet Explorer 8 and Internet Explorer 7 will receive this style sheet. </p>
<![endif]-->
<!--[if IE 7]> //means = IE 7
<p>You're using a recent version of Internet Explorer 7.</p>
<![endif]-->
<!--[if gt IE 6]> //means > IE 6
<p>You're using a recent version of Internet Explorer.</p>
<![endif]-->
<!--[if lt IE 6]> // meas < IE 6
<p>Hm. You should upgrade your copy of Internet Explorer.</p>
<![endif]-->
<![if !IE]> means is not IE
<p>You're not using Internet Explorer.</p>
<![endif]>
注：
User-Agent String and Version Vector white paper:http://code.msdn.microsoft.com/Release/ProjectReleases.aspx?ProjectName=ie8whitepapers&ReleaseId=531
Understanding User-Agent Strings:http://msdn.microsoft.com/zh-cn/library/ms537503(en-us,VS.85).aspx
How do I keep my site and add-ons working with Internet Explorer 8:http://www.microsoft.com/windows/products/winfamily/ie/ie8/readiness/DevelopersExisting.htm
