<!DOCTYPE html>
<html>
<head>
  <style>
        .content {
            height: 200px;
            overflow: scroll;
            background-image: linear-gradient(white, gray)
        }
  </style>
  <script src="../../resources/ui-helper.js"></script>
  <script>
       if (window.testRunner) {
           testRunner.dumpAsText();
           testRunner.waitUntilDone();
        }

        function logResult(s)
        {
            document.getElementById('result').textContent += s + "\n";
        }

        function scrolled()
        {
            var divId = event.target.id;
            if (divId == "divBottom")
                logResult('PASS: scrolled happened in the bottom div');
            else
                logResult('FAIL: scrolled happened in the top div');

            testRunner.notifyDone();
        }

        async function scrollTest()
        {
            var externalScrollableArea = document.getElementById('externalScrollableArea');
            var externalScrollableAreaBounds = externalScrollableArea.getBoundingClientRect();

            logResult('Sending mouse events');
            await UIHelper.statelessMouseWheelScrollAt(externalScrollableAreaBounds.left + 60, externalScrollableAreaBounds.bottom - 60, 0, -10);
        }

        function startTest()
        {
            var externalScrollableArea = document.getElementById('externalScrollableArea');
            externalScrollableArea.scrollTop = externalScrollableArea.scrollHeight;

            setTimeout(scrollTest, 0);
        }

        window.addEventListener('load', startTest, false);
    </script>
</head>
<body>
<div id="externalScrollableArea" style="overflow: scroll; width: 200px; height: 200px;">
  <div class="content" id="divTop" onscroll="scrolled()">
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    </pre>
  </div>
  <div class="content" id="divBottom" onscroll="scrolled()">
    <pre>
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    </pre>
  </div>
</div>
<pre id="result"></pre>
</body>
</html>
