<!DOCTYPE html> <html class="reftest-wait"> <head> <script> function boom() { document.getElementById("f").className = 'q'; document.documentElement.removeAttribute("class"); } </script> <style> body { width: 10em; } #f:after { content: "TTT"; } </style> </head> <body onload="setTimeout(boom, 0);"> <span id="f">foo foo foo foo foo foo foo foo foo foo<span style="display: block"></span></span> </div> </body> </html>