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+<html>
+
+<head>
+  <title>Accessible attr change event testing</title>
+
+  <link rel="stylesheet" type="text/css"
+        href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+
+  <script type="application/javascript"
+          src="../common.js"></script>
+  <script type="application/javascript"
+          src="../promisified-events.js"></script>
+  <script type="application/javascript"
+          src="../role.js"></script>
+  <script type="application/javascript"
+          src="../states.js"></script>
+
+  <script type="application/javascript">
+    async function testGotAttrChange(elem, name, value) {
+      const waitFor = waitForEvent(EVENT_OBJECT_ATTRIBUTE_CHANGED, elem);
+      if (value) {
+        document.getElementById(elem).setAttribute(name, value);
+      } else {
+        document.getElementById(elem).removeAttribute(name);
+      }
+      await waitFor;
+    }
+
+    async function doTests() {
+      info("Removing summary attr");
+      // after summary is removed, we should have a layout table
+      await testGotAttrChange(
+        "sampleTable",
+        "summary",
+        null
+        );
+
+      info("Setting abbr attr");
+      // after abbr is set we should have a data table again
+      await testGotAttrChange(
+        "cellOne",
+        "abbr",
+        "hello world"
+        );
+
+      info("Removing abbr attr");
+      // after abbr is removed we should have a layout table again
+      await testGotAttrChange(
+        "cellOne",
+        "abbr",
+        null
+        );
+
+      info("Setting scope attr");
+      // after scope is set we should have a data table again
+      await testGotAttrChange(
+        "cellOne",
+        "scope",
+        "col"
+        );
+
+      info("Removing scope attr");
+      // remove scope should give layout
+      await testGotAttrChange(
+        "cellOne",
+        "scope",
+        null
+        );
+
+      info("Setting headers attr");
+      // add headers attr should give data
+      await testGotAttrChange(
+        "cellThree",
+        "headers",
+        "cellOne"
+        );
+
+      info("Removing headers attr");
+      // remove headers attr should give layout
+      await testGotAttrChange(
+        "cellThree",
+        "headers",
+        null
+        );
+
+      SimpleTest.finish();
+    }
+
+    SimpleTest.waitForExplicitFinish();
+    addA11yLoadEvent(doTests);
+  </script>
+</head>
+<body>
+  <table id="sampleTable" summary="example summary">
+      <tr role="presentation">
+        <td id="cellOne">cell1</td>
+        <td>cell2</td>
+      </tr>
+      <tr>
+        <td id="cellThree">cell3</td>
+        <td>cell4</td>
+      </tr>
+    </table>
+</body>
+</html>