title: Half pixel border radius in retina
body: <p>When using a retina display, is it possible to use half-pixel border radius like this:</p>
  
  <pre><code>#box {
      height: 3px;
      width: 100px;
      border-radius: 1.5px;
  }
  </code></pre>
  
  <p>I did it on my retina iPhone 4, and it shows up as a 1px border radius. Any reasons and/or fixes? </p>