<!DOCTYPE html>
<html>
<head>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.setCanOpenWindows();
    testRunner.setPopupBlockingEnabled(true);
    testRunner.setCloseRemainingWindowsWhenComplete(true);
}
</script>
</head>
<body>
<iframe name="A"></iframe>
<iframe id="B" sandbox="allow-scripts allow-same-origin allow-popups allow-modals"></iframe>
<script>
document.getElementById("B").contentWindow.eval('alert(window.open.call(window.top, "about:blank", "A") ? "FAIL" : "PASS");');
</script>
</body>
</html>