title: What values can appear in the "selected" attribute of the "option" tag?
body: <p>I have some markup similar to the following:</p>
  
  <pre><code>&lt;select&gt;
    &lt;option selected="selected"&gt;Apple&lt;/option&gt;
    &lt;option selected=""&gt;Orange&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>In this case, "Orange" shows as the selected item.  I would have expected making the <code>selected</code> attribute blank would undo its effects.  Is there a way to write this without simply leaving the attribute out?</p>