title: Trim empty HTML tag
body: <p>I have in my HTML code this line:</p>
  
  <pre><code>&lt;iframe src="http://example.com"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>As editor I use Aptana.</p>
  
  <p>How can I solve this warning? What does it mean?</p>
  
  <blockquote>
    <p>"Should trim empty <code>&lt;iframe&gt;</code>."</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/ROwu9.png" alt="&quot;Should trim empty &lt;iframe&gt;.&quot;"></p>