title: This code still has one warning in html code validator. What I still need to insert into it?
body: <p>This is the code:</p>
  
  <pre><code>&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt;
  &lt;html&gt;
  &lt;head&gt;
  </code></pre>
  
  <p>It seems I have a problem here:</p>
  
  <pre><code>&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8"&gt;
  
  
  
  &lt;script type='text/javascript'&gt;
  
  function run(){
  var div = document.createElement('div')
  div.style.position = 'absolute'
  div.style.left = '0px'
  div.style.top = '0px'
  div.onmouseover=function(){
      alert('mo')
      this.style.opacity = 0
  }
  div.style.width = '30px'
  div.style.height = '30px';
  div.style.backgroundColor = '#000'
  document.body.appendChild(div)
  }
  
  onload = run
  &lt;/script&gt;
  &lt;title&gt;&lt;/title&gt;
  
  &lt;/head&gt;
  
  &lt;body&gt;
  
  &lt;/body&gt;
  
  &lt;/html&gt;
  </code></pre>
  
  <p>What do I still need to insert or edit, so my code becomes fully ok in code validator?
  Thanks :)</p>