title: Why does Visual Studio 2013 recognize CSS3 display: flexbox, but not flex?
body: <p>On my CSS pages Visual Studio doesn't recognize flex, claiming it's not valid:</p>
  
  <pre><code>div {
      display: flex;
      display: inline-flex;
  }
  </code></pre>
  
  <p>It does however recognize flexbox :</p>
  
  <pre><code>div {
      display: flexbox;
      display: inline-flexbox;
  }
  </code></pre>
  
  <p>Flexbox does not seem to be supported in any of the main browsers, yet flex is. Can anyone explain this?</p>
  
  <p>Thanks.</p>