title: position:relative not working in IE9
body: <p>I am developing a HTML page in which we have a table having <code>&lt;thead&gt;</code> tag used for the header section. Now I want to fixed this header section always on top. Following is the CSS code which I am using:</p>
  
  <pre><code>thead tr { 
     position:relative; 
     top: expression(offsetParent.scrollTop); 
  }
  </code></pre>
  
  <p>However, this is only working in IE8. It is not working in IE9.
  So how can we achieve the same in IE9?</p>
  
  <p>Thanks in advance!!!</p>