<!DOCTYPE html>
<iframe src="resources/sandbox.py?sandbox=allow-top-navigation"></iframe>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

window.onload = function() {
    var frame = document.getElementsByTagName("iframe")[0];
    if (frame.contentDocument)
        alert("FAIL: Iframe was not in a unique origin");
    else
        alert("PASS: Iframe was in a unique origin");
};
</script>