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diff --git a/testing/web-platform/tests/html/editing/dnd/the-datatransfer-interface/dndTransferCases-manual.html b/testing/web-platform/tests/html/editing/dnd/the-datatransfer-interface/dndTransferCases-manual.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset='utf-8'>
+    <title>HTML Test: dropzone_attribute_data_item_kind_string</title>
+    <link rel='author' title='Intel' href='http://www.intel.com'>
+    <link rel='author' title='Domenic Denicola' href='mailto:d@domenic.com'>
+    <link rel='help' href='https://html.spec.whatwg.org/multipage/#the-datatransfer-interface'>
+    <script src='/resources/testharness.js'></script>
+    <script src='/resources/testharnessreport.js'></script>
+    <style>
+      #drop {
+        border: 2px solid black;
+        width: 100px;
+        height: 100px;
+        padding: 20px;
+      }
+      #drag {
+        color: blue;
+        margin: 20px auto;
+      }
+    </style>
+  </head>
+
+  <body>
+    <div>Select and drag the blue text to rectangular box.</div>
+    <div id='drag' draggable>blue text</div>
+    <div id='drop' dropzone='copy string:text/plain'></div>
+    <div id='log'> </div>
+
+    <script>
+      var drag;
+      setup(function() {
+          drag = document.querySelector('#drag');
+      }, {explicit_done: true, explicit_timeout: true});
+
+      on_event(drag, 'dragstart', function(event) {
+        test(function() {
+          assert_equals(event.dataTransfer.effectAllowed, 'uninitialized');
+        }, 'effectAllowed should be "uninitialized"');
+
+        test(function() {
+          assert_equals(event.dataTransfer.types.constructor, Array, 'should be an array');
+          assert_true(Object.isFrozen(event.dataTransfer.types), 'should be frozen');
+        }, 'types should be a frozen array');
+
+        test(function() {
+          assert_false('contains' in event.dataTransfer.types);
+          assert_false('item' in event.dataTransfer.types);
+        }, 'types should not have any of the historical methods');
+
+        test(function() {
+          assert_equals(event.dataTransfer.types, event.dataTransfer.types);
+        }, 'types should return the same object from multiple reads (assuming no changes)');
+
+        test(function() {
+          var before = event.dataTransfer.types;
+          event.dataTransfer.clearData();
+          assert_not_equals(event.dataTransfer.types, before);
+        }, 'types should return a different object after changes');
+
+        done();
+      });
+    </script>
+  </body>
+</html>