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<html>
<body>
The top navigation from this iframe should be blocked. This text should appear.
<script>
window.onload = function()
{
try {
top.location = "navigation-changed-iframe.html";
top.postMessage("FAIL", "*");
} catch(e) {
top.postMessage("PASS", "*");
}
}
</script>
</body>
</html>