<html class="reftest-wait"> <head> <script> function boom() { document.getElementById("M").style.width = "6em"; document.documentElement.removeAttribute("class"); } </script> <body onload="setTimeout(boom, 30);"> <div style="position:absolute; top: 50px; left: 50px; border: 2px solid orange;"> <select> <option id="M">M</option> </select> <br> <select style="width: 200%"> <option style="visibility: collapse; overflow: auto; display: table-footer-group;">X</option> </select> </div> </body> </html>