<!-- Testcase originally by <moz_bug_r_a4@yahoo.com> --> <!DOCTYPE html> <meta charset="utf-8"> <title>Test for bug 463206</title> <iframe src="data:text/html;charset=utf-8,<iframe></iframe><iframe%20src='data:text/html;charset=utf-8,<input%2520id=%2522in1%2522>'></iframe>"></iframe> <iframe src="data:text/html;charset=utf-8,<input%20id='out1'><input%20id='out2'><iframe%20src='data:text/html;charset=utf-8,<input%2520id=%2522in1%2522>'>"></iframe> <input id="out1"> <input name="1|#out2">