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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/datastore/datatransfer-constructor-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>DataTransfer constructor test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
  var dt = new DataTransfer();
  assert_equals(dt.dropEffect, "none");
  assert_equals(dt.effectAllowed, "none");
  assert_equals(dt.items.length, 0);
  assert_equals(dt.types.length, 0);
}, "Verify DataTransfer constructor")
</script>