<!DOCTYPE html>
<html>
<body>
<script src="../../../resources/js-test.js"></script>
<script>

description('This tests disconnecting a MutationObserver while a mutation record is enqueued. WebKit should not crash.');

if (!window.GCController)
    testFailed('This test requires GCController');
else {
    jsTestIsAsync = true;

    var observer = new MutationObserver(function() {});

    var div = document.createElement('div');
    document.body.appendChild(div);

    observer.observe(div, {childList: true});

    var script = document.createElement('script');
    script.textContent = 'disconnectObserver()';

    var child = document.createElement('div');
    child.appendChild(script);
    div.appendChild(child);

    function disconnectObserver() {
        observer.disconnect();
        observer = null;
        GCController.collect();
        observer = new MutationObserver(function() {});
    }

    window.onload = () => {
        testPassed('WebKit did not crash');
        finishJSTest();
    }
}

var successfullyParsed = true;

</script>
</body>
</html>