title: CSS3 box-shadow + inset + RGBA
body: <p>I'm doing some tests with new features of CSS3, but this combination only works in lastest versions of Chrome and Firefox, but not in Safari or Opera:</p>
  
  <pre><code>box-shadow:         inset 0px -10px 20px 0px rgba(0, 0, 0, 0.5);
  -webkit-box-shadow: inset 0px -10px 20px 0px rgba(0, 0, 0, 0.5);
  -moz-box-shadow:    inset 0px -10px 20px 0px rgba(0, 0, 0, 0.5);
  </code></pre>
  
  <p>I really don't know if they fails in the box-shadow itself, in the inset parameter, or in RGBA color. It's a syntax error or simply Safari and Opera lacks on this?</p>