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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/dom/specials.html 

<!doctype html>
<html>
  <head>
    <title>Exposing drag &amp; drop events on document and window</title>
    <script type="text/javascript" src="/resources/testharness.js"></script>
    <script type="text/javascript" src="/resources/testharnessreport.js"></script>
  </head>
  <body>

    <div id="log">Enable script and reload</div>
    <script type="text/javascript">
var allEvents = ['ondragstart','ondrag','ondragover','ondragenter','ondragleave','ondrop','ondragend'];
var allObjects = [['window',window],['document',document],['HTMLElement',document.createElement('div')]];
var fails = [];
for( var i = 0; i < allObjects.length; i++ ) {
  for( var j = 0; j < allEvents.length; j++ ) {
    test(function () {
      assert_true(allEvents[j] in allObjects[i][1]);
    }, allEvents[j] + ' in ' + allObjects[i][0]);
  }
}
    </script>

  </body>
</html>