<!DOCTYPE html>
<html>
<head>
<script src="resources/wheel-handler-region-helper.js"></script>
<script>
    if (window.testRunner)
        testRunner.waitUntilDone();

    function dumpRegion(prefix)
    {
        if (window.internals) {
            var rects = window.internals.nonFastScrollableRects();
            document.getElementById('output').textContent += prefix + rectsAsString(rects) + '\n';
        }
    }

    function doTest()
    {
        var frame = document.getElementById('frame');
        dumpRegion('before: ');
        frame.style.display = 'none';
        dumpRegion('after hide: ');
        
        setTimeout(function() {
            frame.style.display = 'inline';
            dumpRegion('after show: ');

            if (window.testRunner)
                testRunner.notifyDone();
        }, 0);
    }
    window.addEventListener('load', doTest, false);
</script>
</head>
<body>
<iframe id="frame" srcdoc="<html><body style='width:1000px;height:1000px;'></body></html>"></iframe>
<pre id="output"></pre>
</body>
</html>