<!DOCTYPE html>

<html>
<head>
    <style>
        html {
            background-color: white;
        }
        body {
            background-color: silver;
            height: 400px;
            margin: 0;
        }
        
        .tall {
            position: absolute;
            top: 0;
            background-color: gray;
            height: 2000px;
            width: 20px;
        }
        
        #results {
            position: fixed;
            margin-left: 25px;
        }
    </style>
    
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }
        
        function setResult(s)
        {
            document.getElementById('results').innerText = s;
        }

        function runTest()
        {
            window.addEventListener('mousewheel', function(event) {
                setResult('PASS: received mousewheel event');
                if (window.testRunner)
                    testRunner.notifyDone();
            }, false)
            window.scrollTo(0, 800);
            
            window.setTimeout(function() {
                if (window.eventSender) {
                    eventSender.mouseMoveTo(50, 100);
                    eventSender.mouseScrollBy(-1, -2);
                }
                
                // Watchdog timer in case of failure.
                window.setTimeout(function() {
                    if (window.testRunner)
                        testRunner.notifyDone();
                }, 100);
            }, 0);
        }
        
        window.addEventListener('load', runTest, false);
    </script>
</head>
<body>
<div id="results">
    FAIL: did not receive mousewheel event.
</div>
<div class="tall"></div>
</body>
</html>