<html>
<script src="../../resources/js-test-pre.js"></script>
<script>
  if (window.internals) {
      window.internals.setUsesMockScrollAnimator(true);
      window.internals.setUsesOverlayScrollbars(true);
  }
  if (window.testRunner) {
      testRunner.waitUntilDone();
      testRunner.dumpAsText();
  }
  window.onload = function () {
      document.body.offsetTop; // force layout.
      setTimeout(() => {
      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);
      }
      if (window.testRunner)
          testRunner.notifyDone();
     }, 0);
  };
</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 width="1024" height="768" id="frame" src="data:text/html,<html></html>"></iframe>
  <pre id="console"></pre>
</body>
</html>