drag-and-drop-autoscroll-inner-frame.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
  window.onload = () => {
    fetch_tests_from_window(frames[0]);
  }
</script>
<style>
  iframe {
    position: relative;
    top: 100px;
    width: 300px;
    height: 300px;
  }
</style>
For manual testing, drag and drop "Drop Me" downwards and then upwards.
<iframe src="resources/drag-and-drop-autoscroll-frame.html"></iframe>

chromium/third_party/blink/web_tests/fast/events/drag-and-drop-autoscroll-inner-frame.html