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<head>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.setXSSAuditorEnabled(true);
    testRunner.setCanOpenWindows();
    testRunner.setCloseRemainingWindowsWhenComplete(true);
    testRunner.waitUntilDone();
}
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<p>This test PASSED if we don't trigger an assertion failure when opening a pop-up window without a URL. To run this test by hand, ensure that pop-up windows aren't blocked before loading this page.</p>
<pre id="console"></pre>
<script>
function finish()
{
    document.getElementById("console").innerText = "PASSED";
    if (window.testRunner)
        testRunner.notifyDone();
}

function runTest()
{
    var childWindow = window.open("");
    if (!childWindow) {
        document.getElementById("console").innerText = "FAILED to open pop-up window. Ensure that pop-up windows aren't blocked.";
        return;
    }

    childWindow.document.open();
    childWindow.document.write("PASSED");

    <!-- Break up the HTML Script Element so it is not interpreted by HTML4 parsers as per <http://www.w3.org/TR/html4/types.html#type-cdata>. -->
    childWindow.document.write("<scr" + "ipt>window.opener.finish()<" + "/script>");

    childWindow.document.close();
}
runTest();
</script>
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