title: Color "transparent" not working
body: <p>I have a problem with the IE (what else?):</p>
  
  <p>I generate content with CSS which has also a background-image.
  I looks like that:</p>
  
  <pre><code>#nav ul li:after {
      content: "--";
      position: relative;
      z-index: 99;
      background: transparent url(image.png);
      color: transparent;
  }
  </code></pre>
  
  <p>The text color is in non-IE-browsers transparent, but in all IE browsers (IE6-IE8) it's black and you could see it.
  How could I make the text transparent/unvisible?</p>
  
  <p>I tried already: visibility - opacity - filter - text-indent ...
  But none did his job right, either it disappears (with it background which I need) or the attribute doesn't apply.</p>