title: Stylesheets not loading in IE 9 despite mime type
body: <p>I have an MVC 4 application making use of bundling and minification. The application works 100% correct on IE 11, chrome and other browsers but the style sheets are not rendering when using IE9.</p>
  
  <p>I added the following to my web.config's system.webserver section</p>
  
  <pre><code>&lt;staticContent&gt;
    &lt;remove fileExtension=".css"/&gt;
    &lt;mimeMap fileExtension=".css" mimeType="text/css"/&gt;
  &lt;/staticContent&gt;
  </code></pre>
  
  <p>and it seems that the mime type is correct when using IE's developer tools</p>
  
  <p><img src="https://i.stack.imgur.com/5Ynz5.png" alt="enter image description here"></p>
  
  <p>If the mime type is correct and all stylesheets seems to load, why won't it render? </p>
  
  <p><strong>Side Note:</strong> I'm also using Twitter Bootstrap 3 and FontAwesome, not sure if this is causing problems.</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>When I use fiddler I can see that the mime type is still set to text/css; charset=utf-8</p>
  
  <p><img src="https://i.stack.imgur.com/0kPfA.png" alt="enter image description here"></p>