<!DOCTYPE html> <html class="reftest-wait"> <head> <script> function boom() { var t = document.getElementById("f").contentDocument.documentElement; t.contentEditable = "true"; t.focus(); document.body.appendChild(t); setTimeout(finish, 0); } function finish() { document.documentElement.className = ""; } </script> </head> <body onload="setTimeout(boom, 200);"><iframe id="f" src="data:application/xhtml+xml,<html xmlns='http://www.w3.org/1999/xhtml'></html>"></iframe></body> </html>