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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/the-datatransfer-interface/DataTransfer-types-manual.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>DataTransferItem Test: types - files</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/dnd.html#dom-datatransfer-types"/>
<meta name="flags" content="interact">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<p><div id="div" style="border: 2px green solid; width: 200px; height: 200px;"></div></p>

<h2>Test steps:</h2>
<p>Drag a file enter the green box, then drop file out</p>

<script>

let div = document.getElementById("div");

setup({explicit_done: true});
setup({explicit_timeout: true});

on_event(div, "dragenter", evt => {
  let type = evt.dataTransfer.types[0];
  test(() => {
    assert_equals(type, "Files");
  }, "Check if one of the types will be the string 'Files' when drag a file");
  done();
});

</script>