<html class="reftest-wait"> <head> <style> body { margin: 0px; } div { width:100px; height:100px; display: inline-block; position:absolute; } </style> </head> <body> <div id="first" style="background-color:green; width:200px; height:200px" class="reftest-no-display-list"></div> <div style="transform:translateZ(1px)"> <div id="second" style="background-color:red"></div> </div> </body> <script> function doTest() { document.getElementById("second").style.backgroundColor = "green"; document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate", doTest); </script> </html>