<!DOCTYPE html> <html class="reftest-wait"> <head> <meta charset="UTF-8"> <script> function start() { var doc = document.getElementsByTagName("iframe")[0].contentDocument; var vid = doc.getElementsByTagName("video")[0]; function runnable() { // The doc.write forces us to recreate doc's body. doc.write("Hello, world"); doc.body.appendChild(vid); document.documentElement.removeAttribute("class"); } doc.open(); setTimeout(runnable, 0); } </script> </head> <body onload='start()'> <iframe src="data:text/html,<meta charset=UTF-8><body><video src=http://localhost:8080/ controls=true loop=true autoplay=true autobuffer=false></video>"></iframe> </body> </html>