title: Using a calc() to create an auto-sized element according to aspect ratio?
body: <p>I have a video container, and it'd be splendid if I could use <code>calc</code> to calculate the height based on the width.</p>
  
  <p>There are some inklings of <a href="https://stackoverflow.com/a/11243226/551828">stackoverflow answers</a> that claim something like this is possible:</p>
  
  <pre><code>.selector{
    width: 100%;
    height: calc(width * 1.75);
  }
  </code></pre>
  
  <p>But I haven't seen that work in Chrome 26. How can I calculate the height only using CSS3?</p>