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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function loaded() {
var f = document.getElementById("x");
f.firstChild.remove();
}
</script>
</head>
<frameset rows="*,*" id="x" onload="loaded()"
><frame src="data:text/plain,PASS"
><frame src="data:text/plain,PASS"></frameset>
</html>