LayoutTests/http/tests/security/resources/cross-frame-iframe-for-object-put-optimization-test.html

<h1 id="password">Cocoa</h1>
<script>
onload = function() {
    location.__defineSetter__('setter', function(value) {
        throw new Error();
    });
    parent.postMessage("finishedLoad", "*");
}
</script>