title: Can I colour backgrounds of selected items in HTML select options with CSS only?
body: <p>I've searched around a lot and see people suggesting that:</p>
  
  <pre><code>::-moz-selection {background: red;}
  ::selection {background: red; }
  </code></pre>
  
  <p>..works for colouring the background of the currently selected items in a multiple select form item. (Note: I mean the selected items, not the items with focus).</p>
  
  <p>I can't get this to work. Am I doing it wrong?</p>
  
  <pre><code>#dropdowns select::selection {
      background: red;
  }
  </code></pre>
  
  <p>Cheers :/</p>
  
  <p>Setup: Using Chrome for Mac</p>