<html class="reftest-wait"> <head> <style id="style"> .ch1 { counter-increment: chicken; } </style> <script> function boom() { document.getElementsByTagName("ol")[0].setAttribute("class", "wtf"); document.getElementById("style").textContent = ".ch2 { counter-increment: chicken; }"; document.documentElement.removeAttribute("class"); } </script> </head> <body onload="setTimeout(boom, 30);"> <ol> <li class="ch1">item</li> <li>item <ol> <li class="ch2">item</li> </ol> </li> </ol> <ol class="ch2"> <li>item</li> </ol> </body> </html>