<!DOCTYPE html> <html class="reftest-wait"> <head> <title></title> <script type="text/javascript"> //<![CDATA[ function showBug() { document.getElementById('x').style.width = 0; } window.addEventListener("MozReftestInvalidate", function() { showBug(); document.documentElement.className = ""; }, false); //]]> </script> </head> <body style="width: 1000px; margin: 0; padding: 0"> <table cellpadding="0" cellspacing="0" align="center"> <tr> <td> <div style="background:red; WIDTH: 400px; height:400px;"></div> <div id="x" style="width: 600px"></div> </td> </tr> </table> <div style="position: absolute; top: 0; left: 300px; height: 400px; width: 400px; background: green; opacity: 0.9"></div> <br/> <div style="text-align: center;"> <form method="get" action="#"> <input onclick="showBug(); return false;" value="Trigger Bug" type="button" /> </form> </div> </body> </html>