<!DOCTYPE html> <html class="reftest-wait"> <body> <div style="overflow:hidden;height:100px"> <div style="overflow-x:hidden;position:sticky;top:50px"> <div id="testdiv" style="width:10px;height:10px;background-color:green"></div> </div> </div> <script> function doTest() { var x = document.getElementById('testdiv'); x.style.width = "200px"; document.documentElement.className = ""; } document.addEventListener("MozReftestInvalidate", doTest, false); </script> </body> </html>