title: IE Compatibility Mode Issues
body: <p>I'm having issues setting the IE compatibility mode in a website and various connected web apps and after much research on the subject I'm still a bit confused as to how this works. Basically I am working on a company website that is having issues when accessed via IE10 and am trying to set it to run in IE9 compatibility mode. There are many third party controls and various other elements of the site that are not working on IE10 and I don't have the time yet to update this site completely (it is a rather large site). Everything I have found has told me to set the compatibility mode by either adding code to the web config file or in a meta tag in the header. Seems easy enough.</p>
  
  <pre><code>&lt;httpProtocol&gt;
    &lt;customHeaders&gt;
      &lt;clear /&gt;
      &lt;add name="X-UA-Compatible" value="IE=9" /&gt;
    &lt;/customHeaders&gt;
  &lt;/httpProtocol&gt;
  </code></pre>
  
  <p>or</p>
  
  <pre><code>&lt;meta http-equiv="X-UA-Compatible" content="IE=9"&gt;
  </code></pre>
  
  <p>Now when I set the compatibility mode manually (not in code but in my own browser) everything works fine and this is what I see via the IE developer tools.</p>
  
  <pre><code>Browser Mode: IE10 Compat View    Document Mode: IE9 Standards
  </code></pre>
  
  <p>The issue here is that when I set this in my code, via one of the methods listed above, this is what I see and nothing seems to change.</p>
  
  <pre><code>Browser Mode: IE10    Document Mode: IE9 Standards
  </code></pre>
  
  <p>Notice that only the document mode is affected here, unlike when I make the change manually. As mentioned, I've done a lot of research on this and still don't quite understand the difference between browser mode and document mode or why the one I seemingly need to change is unaffected by the solution everyone seems to recommend here. Can anyone help me understand exactly what this means and what the point is, and more importantly does anyone know how to do what I am trying to accomplish here?</p>