title: why height: calc(100% - 100px) is not working
body: <p><a href="http://jsfiddle.net/UaYfW/49/" rel="noreferrer">JsFiddle</a>
  I am trying to set height of the test div as calc(100%-100px). why it is not working.</p>
  
  <pre><code>.test {
    height: calc(100%-100px);
   }
  </code></pre>