<html>
<script src="../../resources/js-test-pre.js"></script>
<script>
    jsTestIsAsync = true;
    if (window.internals) {
        window.internals.setUsesMockScrollAnimator(true);
        window.internals.setUsesOverlayScrollbars(true);
    }

    function runTest() {
        if (window.internals)
            internals.updateLayoutAndStyleForAllFrames();
        if (window.eventSender) {
            eventSender.mouseMoveTo(0, 0);
            // Move to a position that is over the vertical scrollbar and the iframe.
            eventSender.mouseMoveTo(window.innerWidth - 4, 100);
            eventSender.mouseDown();
            eventSender.mouseUp();
            eventSender.mouseMoveTo(0, 0);
        }
        finishJSTest();
    };
</script>
<script src="../../resources/js-test-post.js"></script>
<body>
  <p>Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=165056">https://bugs.webkit.org/show_bug.cgi?id=165056</a>.</p>
  <iframe onload="runTest()" width="1024" height="768" id="frame" src="data:text/html,<html></html>"></iframe>
  <pre id="console"></pre>
</body>
</html>