<!DOCTYPE HTML> <html class="reftest-wait"> <body> <div id="b" style="width:100px; height:100px; position:relative; top:50px; -moz-appearance:button"></div> <script> var b = document.getElementById("b"); function doTest() { b.style.top = "60px"; document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate", doTest, false); </script> </body> </html>