title: Is it possible to get the value of another elements in CSS
body: <p>I'm creating a mobi site and would like to set the height of some of my elements to a multiple of the width, sorry if I'm not coming off clear enough here is an example of what I want to do.</p>
  
  <pre><code>#myDiv{
  width : 40%;
  height : width * 1.4;
  }
  </code></pre>
  
  <p>I initially was just going to set the height to +-50% but I later realized I loose the aspect ratio depending on the screen size of the phone.</p>