Internet Explorer Compatibility View

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The newer Internet Explorer comes with the F12 Developer Tools wherein you find the Browser Mode and the Document Mode.

Difference between the Browser Mode and the Document Mode

Document Mode is something that the web server can control. By specifying the HTTP header, the HTML meta-tags, or the DocType declaration, the Document Mode changes accordingly. See my earlier article.

However, the Browser Mode cannot be changed by the server.

What really happens when IE Compatibility View is activated?

when IE Compatibility View is activated, the HTTP user-agent header is changed to that of IE7.

The user-agent sent by the browsers follows:

IE Browser Mode User-Agent
IE10 Mozilla/5.0 (compatible; MSIE 10.0;
Windows NT 6.1; Trident/6.0)
IE9 Mozilla/5.0 (compatible; MSIE 9.0;
Windows NT 6.1; Trident/5.0)
IE8 Mozilla/4.0 (compatible; MSIE 8.0;
Windows NT 6.1; Trident/4.0)
IE7 Mozilla/4.0 (compatible; MSIE 7.0;
Windows NT 6.1)
IE10 WinPhone Mozilla/5.0 (compatible; MSIE 10.0;
Windows Phone 8.0; Trident/6.0; IEMobile/10.0; ARM; Touch)
IE Compatible View Mozilla/4.0 (compatible; MSIE 7.0;
Windows NT 6.1; Trident/6.0)

Note:

  1. Operating System differences:
    1. Windows 8 uses NT 6.2
    2. Windows 7 uses NT 6.1
    3. Windows Vista uses NT 6.0
  2. Layout Engine differences: regardless of Browser Mode in use,
    1. IE 10 browser uses Trident 6.0
    2. IE 9 browser uses Trident 5.0
    3. IE 8 browser uses Trident 4.0

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