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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/interactiveelements/017.html 

<!doctype html>
<html>
  <head>
    <title>Scrollable element inside draggable element</title>
    <style type="text/css">
div div { width: 300px; height: 100px; overflow: auto; border: 1px solid orange; }
    </style>
    <script type="text/javascript">
window.onload = function () {
  document.getElementsByTagName('div')[0].ondragstart = function (e) {
    e.dataTransfer.effectAllowed = 'copy';
    e.dataTransfer.setData('Text', 'dummy text');
  };
};
    </script>
  </head>
  <body>

    <p>It should be possible to drag the scrollbar thumbs of the box below without dragging the whole box.</p>
    <div draggable="true">
      <div>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>Dummy text<br>xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</div>
    </div>

  </body>
</html>