<!DOCTYPE html>

<html>
<head>
    <style>
    </style>
    <script src="../../resources/js-test-pre.js"></script>
    <script>
    </script>
</head>
<body>

    <script>
    if (window.testRunner)
        testRunner.waitUntilDone();

    description("Tests that detaching and reattaching a frame with a wheel event handlers doesn't crash.");
    
    const maxLoads = 10;
    var loadCount = 0;

    var frame;
    function makeFrame()
    {
        frame = document.createElement('iframe');
        frame.addEventListener('load', function() {
            if (window.internals)
                shouldBe("internals.wheelEventHandlerCount()", "0");

            frame.remove();
            window.setTimeout(checkFrameRemoved, 0);
        });

        frame.src = 'resources/wheel-event-handler-on-document.html';
        addFrameToDocument(frame);
    }
    
    function checkFrameRemoved()
    {
        gc();

        if (window.internals)
            shouldBe("internals.wheelEventHandlerCount()", "0");

        if (++loadCount == maxLoads) {
            isSuccessfullyParsed();
            if (window.testRunner)
                testRunner.notifyDone();

            return;
        }

        window.setTimeout(function() {
            addFrameToDocument(frame);
        }, 0);
    }

    function addFrameToDocument(frame)
    {
        document.body.appendChild(frame);
    }
    
    makeFrame();
    </script>
</body>
</html>