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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>

function boom()
{
    document.styleSheetSets.expando = null;
    var otherDoc = document.implementation.createDocument("", "", null);
    var otherSpan = otherDoc.createElementNS("http://www.w3.org/1999/xhtml", "span");

    var img = document.createElementNS("http://www.w3.org/1999/xhtml", "img");
    img.srcset = "data:,a 1w, data:,b 1w";
    img.sizes = "1px";
    otherSpan.appendChild(img);
}

</script>
</head>
<body onload="boom();"></body>
</html>