<!DOCTYPE html> <html class="reftest-wait" style="height: 100%"> <head> <script> function doIt() { var d = document.createElement("div"); d.setAttribute("style", "position: absolute; left: 0; right: 0; top: 0; " + "bottom: 0; background: green"); document.getElementById("x").appendChild(d); document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate", doIt); </script> </head> <body style="height: 100%"> <fieldset id="x" style="position: relative; display: table; width: 50%; height: 50%; top: 25%; left: 25%"> </fieldset> </body> </html>