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<!DOCTYPE html>
<html>
<head>
<script>document.domain = "example.org"</script>
</head>
<body>
<iframe width="500" height="200" src="javascript:"<!DOCTYPE html> <html> <script> function $(str) { return document.getElementById(str); } function hookLoad(str) { $(str).onload = function() { window.parent.parent.postMessage('end', '*'); }; window.parent.parent.postMessage('start', '*'); } window.onload = function() { hookLoad(\"w\"); $(\"w\").contentWindow.location.href = \"example.org.png\"; hookLoad(\"x\"); var doc = $(\"x\").contentDocument; doc.write('<img src=\"example.org.png\">'); doc.close(); }; function doIt() { hookLoad(\"y\"); $(\"y\").contentWindow.location.href = \"example.org.png\"; hookLoad(\"z\"); var doc = $(\"z\").contentDocument; doc.write('<img src=\"example.org.png\">'); doc.close(); } </script> <body> <iframe name=\"w\" id=\"w\" width=\"100\" height=\"100\"></iframe> <iframe name=\"x\" id=\"x\" width=\"100\" height=\"100\"></iframe> <iframe name=\"y\" id=\"y\" width=\"100\" height=\"100\"></iframe> <iframe name=\"z\" id=\"z\" width=\"100\" height=\"100\"></iframe><img src=\"example.org.png\"> </body> </html>" "
onload="window.frames[0].doIt();"></iframe>
</body>
</html>