title: Facebook Likebox "allowTransparency" gives invalid XHTML in W3C validator
body: <p><strong>What I did:</strong> I embedded Facebook Like Box on my otherwise "XHTML 1.0 Transitional" webpage. The source code of Facebook Like Box is as given by Facebook:</p>
  
  <pre><code>&lt;iframe src="http://www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Fplatform&amp;amp;width=292&amp;amp;colorscheme=light&amp;amp;show_faces=true&amp;amp;stream=false&amp;amp;header=true&amp;amp;height=62"
    scrolling="no"
    frameborder="0"
    style="border:none; overflow:hidden; width:292px; height:62px;"
    allowTransparency="true"&gt;
  &lt;/iframe&gt;
  </code></pre>
  
  <p><strong>What W3C validator says:</strong> When I check the webpage in W3C validator, it gives following error:</p>
  
  <blockquote>
    <p>Line 600, Column 421: there is no attribute "allowTransparency"</p>
  </blockquote>
  
  <p>But, IE needs <code>allowTransparency="true"&gt;</code> to work.</p>
  
  <p><strong>Expected Solution:</strong> What should I do to make it validate as XHTML 1.0 Transitional while keeping Facebook like box on my webpage.</p>