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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
<script>
function boom()
{
document.documentElement.appendChild(document.getElementById("f").contentDocument.getElementById("m"));
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="boom();">
<iframe id="f" srcdoc="<!DOCTYPE html><body><marquee id=m>"></iframe>
</body>
</html>