title: Why does display: -ms-flex; -ms-justify-content: center; not work in IE10?
body: <p>Why doesn't the following code work in IE10?</p>
  
  <pre class="lang-css prettyprint-override"><code>.foo {
      display: -ms-flex; 
      -ms-justify-content: center;
  }
  </code></pre>
  
  <p>What do I need to write in order for them to work?</p>