<!DOCTYPE HTML> <html class="reftest-wait"> <head> <style> .test { position:fixed; display:none; width:100px; height:100px; background:yellow; } .doTest .test { display:block; } </style> </head> <body> <div style="transform:translate(10px,0); overflow:scroll; width:200px; height:200px;"> <div class="test"></div> </div> <script> function doTest() { document.documentElement.setAttribute("class", "doTest"); } window.addEventListener("MozReftestInvalidate", doTest, false); </script> </body> </html>