<html>
<head>
    <script src="resources/wheel-handler-region-helper.js"></script>
    <style>
    body {
        margin: 0;
    }

    .fixed {
        background: #fff;
        position: fixed;
        width: 100px;
        height: 100px;
        overflow: scroll;
    }

    .tall {
        height: 2000px;
    }

    .wide {
        width: 2000px;
    }
    </style>
    <script>
    function dumpRegion()
    {
        if (window.internals) {
            var rects = window.internals.nonFastScrollableRects();
            document.getElementById('output').textContent = rectsAsString(rects);
        }
    }
    </script>
</head>
<body onload="dumpRegion()">
    <div class="fixed">
        <div class="tall"></div>
    </div>
    <div class="tall wide"></div>
    <pre id="output"></pre>
</body>
</html>