LayoutTests/js/dom/construct-global-object.html

<p>This page tests which object prototype is used when calling "new" across
windows. If the test passes, you'll see a series of PASS messages below.
</p>

<pre id="console"></pre>

<iframe id="iframe" style="visibility:hidden"></iframe>

<script>
function log(s)
{
    document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
}

function shouldBe(a, aDescription, b)
{
    if (a === b)
        log("PASS: " + aDescription + " should be " + b + " and is.");
    else
        log("FAIL: " + aDescription + " should be " + b + " but instead is " + a + ".");
}

if (window.testRunner)
    testRunner.dumpAsText();

frames[0].document.open();
frames[0].document.write("<\script>function O() { }</script\>");
frames[0].document.close();

var o = new frames[0].O;
shouldBe(o instanceof frames[0].Object, "o instanceof frames[0].Object", true);
shouldBe(o.__proto__.__proto__ === frames[0].Object.prototype, "o.__proto__.__proto__ === frames[0].Object.prototype", true);
</script>