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diff --git a/testing/web-platform/tests/html/editing/dnd/platform/cancel-right-click.html b/testing/web-platform/tests/html/editing/dnd/platform/cancel-right-click.html
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+++ b/testing/web-platform/tests/html/editing/dnd/platform/cancel-right-click.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Drag and drop with right click</title>
+    <style type="text/css">
+div {
+  width: 100px;
+  height: 100px;
+  background: orange;
+  float: left;
+}
+div + div {
+  background: blue;
+}
+div + div + div {
+  background: fuchsia;
+}
+ol {
+  clear: left;
+}
+    </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>
+    <div draggable="true"></div>
+    <div></div>
+    <div></div>
+    <noscript><p>Enable JavaScript and reload</p></noscript>
+    <ol>
+      <li>Drag the orange square over the blue square.</li>
+      <li>Without releasing the drag, click the right mouse button.</li>
+      <li>If the platform's normal behaviour is to cancel a drag (eg. Windows and Unix+KDE), then the drag should be cancelled;<ul>
+        <li>The drag placeholder should disappear, and the cursor should return to the normal mouse cursor.</li>
+        <li>Move the mouse over the pink square and release the drag. The mouse cursor should remain the normal mouse cursor.</li>
+      </ul></li>
+      <li>If the platform's normal behaviour is not to cancel a drag (eg. Mac and Unix+Gnome), then the drag should not be cancelled;<ul>
+        <li>The drag placeholder should not disappear, and the cursor should be the no-drop cursor.</li>
+        <li>Move the mouse over the pink square and release the drag. The drag placeholder should disappear, and the cursor should return to the normal mouse cursor.</li>
+      </ul></li>
+      <li>Fail in either case if an inappropriate right click function begins (eg. context menu opens).</li>
+    </ol>
+  </body>
+</html>