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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
"use strict";
var f2;
function newIframe()
{
var f = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
f.setAttributeNS(null, "src", "631421.png");
document.body.appendChild(f);
return f;
}
function b1()
{
void newIframe();
f2 = newIframe();
setTimeout(b2, 0);
}
function b2()
{
document.body.removeChild(f2);
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="b1();"></body>
</html>