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<!-- Testcase originally by <moz_bug_r_a4@yahoo.com> -->
<!DOCTYPE html>
<meta charset="utf-8">
<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">