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What version of IE does IE9, IE10, and IE11 emulate respectively when Compatibility View is enabled?

What version of IE does IE9, IE10, and IE11 emulate respectively when Compatibility View is enabled? I've read that IE9 emulates IE7, but is that accurate and what about IE10 and IE11? Any Microsoft or Technet references would be great.
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jcb431
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jcb431
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jcimarronCommented:
jcb431 --
Compatibility View.  I believe those three versions of IE render a webpage in IE7.  

Compatibility Mode.  In IE 10 and 11 you choose the version of IE to be used.

See these references for a discussion of both.
http://blog.algonquinstudios.com/2014/05/06/compatibility-view-in-ie11/
https://frankcode.wordpress.com/2013/10/17/a-guide-to-ie-compatibility-view-and-x-ua-compatible/

In both references the method of choosing which version of IE can be used for Compatibility Mode is primarily that for IE 11.  In IE10, the versions of IE are directly displayed.
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Thomas Zucker-ScharffSystems AnalystCommented:
Also check ietab which will Render in ie 7/8/9 in chrome, Firefox or comodo dragon. Lunascape browser uses all 3 rendering engines  (gecko, trident, webkit), speeding on which you ask for.
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jcb431Author Commented:
I use Chrome and the IE Tab extension, which I really like. The issue I have is that in the enterprise, we are stuck with IE. Most line-of-business apps will work flawlessly with IE9, some will work partially with IE10 and IE11. If what I have read is correct, then IE9-IE11 all emulate IE7 when Compatibility View is selected. My thought process is that if IE9 emulated IE7, then IE10 might emulate IE8, and IE11 emulate IE9, but that doesn't appear to be the case at all. I wonder what is so special about IE7?
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Thomas Zucker-ScharffSystems AnalystCommented:
My understanding is that compatibility mode emulates the previous ie version, but I never really thought about it - I just know it works to put all our ie browsers in comp mode for internal sites. (IT only supports ie 9/10)
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jcimarronCommented:
jcb431--
It is a bit hard to explain.  MS decided to help site code developers by reverting as necessary to the standards of IE7 when and as the standards of the actual version of IE broke the code being used by site developers.
This is explained in great technical detail in
http://blogs.msdn.com/b/ie/archive/2009/03/12/site-compatibility-and-ie8.aspx
and the Compatibility View section of
https://frankcode.wordpress.com/2013/10/17/a-guide-to-ie-compatibility-view-and-x-ua-compatible/

So there is nothing special about IE7 except that many coders were used to using its standards and did not change easily when higher versions of IE were introduced.  So MS stayed with IE7's standards when introducing the Compatibility View concept and with subsequent versions of IE.  
Maybe to keep a single version of Compatibility View.
So "My thought process is that if IE9 emulated IE7, then IE10 might emulate IE8, and IE11 emulate IE9"  No, that is not what MS did.  You would have to ask MS for the actual reason.
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jcimarronCommented:
jcb431--
Your original question was "What version of IE does IE9, IE10, and IE11 emulate respectively when Compatibility View is enabled?"
Have I answered it in http:#a40534462 ?
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jcb431Author Commented:
jcimarron - your post in ID: 40536051 more thoroughly explains what's taking place. Very helpful. Thank you. I really appreciate your help as well Thomas. Thank you.
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jcimarronCommented:
jcb431--
You are welcome.
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Thomas Zucker-ScharffSystems AnalystCommented:
Glad you were able to resolve the problem.
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