chromium/third_party/blink/web_tests/fast/events/middleClickAutoscroll-in-iframe.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../../resources/gesture-util.js"></script>
<script src="../../resources/compositor-controls.js"></script>
<script src="./resources/middleClickAutoscroll.js"></script>
<script>
function start() {
  var iframe = $('iframe');
  var offsetLeft = iframe.offsetLeft;
  var offsetTop = iframe.offsetTop;

  testSetUp({
    'clickOrDrag': 'click',
    'endX': offsetLeft + 5,
    'endY': offsetTop + 50,
    'scrollable': iframe.contentDocument.body,
    'scrolledObject': iframe.contentWindow.document.scrollingElement,
    'startX': offsetLeft + 5,
    'startY': offsetTop + 5,
  });
}
</script>

<body onload="start()">
<div id="container">
<p id="description"></p>
<iframe id="iframe" width="640" height="100"></iframe>
</div>
</body>