<!doctype html> <html class="reftest-wait"> <head> <meta charset=utf-8> <title>Bug 1246046</title> <style> div { width: 0px; height: 100px; background: green; } </style> </head> <body> <div></div> <script> var target = document.querySelector("div"); var anim = target.animate( [ { width: "0px" }, { width: "200px" } ], 2000); anim.pause(); anim.currentTime = 1000; document.documentElement.removeAttribute("class"); </script> </body> </html>