title: css width same as height
body: <p>I would like to do the next trick in my css file so that (height = width) without setting pixels. I want to do this so whatever the resolution of the browser is, to have same values on these two dimensions.</p>
  
  <pre><code>#test{
      height: 100%;
      width: (same as height);
  }
  </code></pre>
  
  <p>I prefer to do it with css and not javascript.</p>
  
  <p>Thank you in advance.</p>