Why document Mode of IE 11 not seen in windows 8 with IIS 7.5

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ASP.NET

IIS7.5

No document mode is shown in IE 8. The OS used is Windows 8. Using VS(2005) and the document mode not shown. But in XP I am getting document mode as 8 with IIS 7.5

doing as follows:

<meta http-equiv="X-UA-Compatible" content="Edge" />

<pre lang="xml">This document is displayed in IE
&lt;script&gt;
document.write(document.documentMode);
&lt;/script&gt;
mode

&lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; IE Only! The documentMode property is supported in IE8+.&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; If no !DOCTYPE is specified, IE8 renders the page in IE5 mode!&lt;/p&gt;</pre>