title: Gradient borders
body: <p>I'm trying to apply a gradient to a border, I thought it was as simple as doing this:</p>
  
  <pre><code>border-color: -moz-linear-gradient(top, #555555, #111111);
  </code></pre>
  
  <p>But this does not work.</p>
  
  <p>Does anyone know what is the correct way to do border gradients?</p>