<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> <html class="reftest-wait"> <head> <title></title> <style> body { margin: 20px; } tr { background: gray; } .t2 tr { outline: 1px solid gray; -moz-outline-radius: .3em; } .t1 tr { outline: 1px solid red; -moz-outline-radius: .3em; } </style> <script type="text/javascript"> function showBug() { document.getElementById("table1").setAttribute("class", "t1"); } window.addEventListener("MozReftestInvalidate", function() { showBug(); document.documentElement.className = ""; }, false); </script> </head> <body> <table id="table1"> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> </table> <table class="t2"> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> <tr><td>AAAA</td></tr> </table> <br/> <form method="get" action="#"> <input type="button" onclick="showBug(); return false;" value="Trigger bug"/> </form> </body> </html>