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<html xmlns="http://www.w3.org/1999/xhtml">
  <head>            
    <title>424465 testcase</title>         
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
         
    <style type="text/css">      
      .standardform {
      background-color: #00f000;
      border: 1px solid #000000; 
      margin-bottom: 3px; /* Remove this line and bug disappears */
      }  
    </style>  

  </head>

  <body>

    <form method="get" action="#">
      <table class="standardform" cellspacing="5">
        <tbody>
          <tr>
            <td colspan="2" id="hiddenColumnBugged">
              <div>.: See the bug ? :.<br/>
                <img src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANwAAAATCAIAAAB0hvS3AAAABGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6AAAdTAAAOpgAAA6lwAAF2+XqZnUAAAAuUlEQVR4nGJkYPjPMApGwWACAAHENNAOGAWjAB0ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABBgAsywBJafN/+UAAAAASUVORK5CYII=' />
                </div>
            </td>
          </tr>
        </tbody>

      </table>
    </form>
  </body>

</html>