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diff --git a/accessible/tests/mochitest/test_descr.html b/accessible/tests/mochitest/test_descr.html
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index 0000000000..c386ee5dc1
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+++ b/accessible/tests/mochitest/test_descr.html
@@ -0,0 +1,134 @@
+<html>
+
+<head>
+  <title>nsIAccessible::description tests</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="name.js"></script>
+
+  <script type="application/javascript">
+    function doTest() {
+      // Description from aria-describedby attribute
+      testDescr("img1", "aria description");
+
+      // No description from @title attribute because it is used to generate
+      // name.
+      testDescr("img2", "");
+
+      // Description from @title attribute, name is generated from @alt
+      // attribute.
+      testDescr("img3", "description");
+
+      // No description from aria-describedby since it is the same as the
+      // @alt attribute which is used as the name
+      testDescr("img4", "");
+
+      // No description from @title attribute since it is the same as the
+      // @alt attribute which is used as the name
+      testDescr("img5", "");
+
+      // Description from content of h2.
+      testDescr("p", "heading");
+
+      // Description from aria-description attribute
+      testDescr("p2", "I describe");
+
+      // Description from contents of h2 when both aria-describedby and
+      // aria-description are present
+      testDescr("p3", "heading");
+
+      // From table summary (caption is used as a name)
+      testDescr("table1", "summary");
+
+      // Empty (summary is used as a name)
+      testDescr("table2", "");
+
+      // From title (summary is used as a name)
+      testDescr("table3", "title");
+
+      // No description from <desc> element since it is the same as the
+      // <title> element.
+      testDescr("svg", "");
+
+      // role="alert" referenced by aria-describedby should include subtree.
+      testDescr("inputDescribedByAlert", "Error");
+
+      SimpleTest.finish();
+    }
+
+    SimpleTest.waitForExplicitFinish();
+    addA11yLoadEvent(doTest);
+  </script>
+
+</head>
+
+<body>
+
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=489944"
+     title="@title attribute no longer exposed on accDescription">
+    Mozilla Bug 489944
+  </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=666212"
+     title="summary attribute content mapped to accessible name in MSAA">
+    Mozilla Bug 666212
+  </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi/id=1031188"
+     title="Ensure that accDescription never duplicates AccessibleName">
+    Mozilla Bug 1031188
+  </a>
+
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test">
+  </pre>
+
+  <p id="description">aria description</p>
+  <img id="img1" aria-describedby="description" />
+  <img id="img2" title="title" />
+  <img id="img3" alt="name" title="description" />
+  <img id="img4" alt="aria description" aria-describedby="description">
+  <img id="img5" alt="image" title="image">
+
+  <h2 id="heading">heading</h2>
+  <p id="p" aria-describedby="heading" role="button">click me</p>
+  <p id="p2" aria-description="I describe" role="button">click me</p>
+  <p id="p3" aria-description="I do not describe" aria-describedby="heading" role="button">click me</p>
+
+  <table id="table1" summary="summary">
+    <caption>caption</caption>
+    <tr><td>cell</td></tr>
+  </table>
+
+  <table id="table2" summary="summary">
+    <tr><td>cell</td></tr>
+  </table>
+
+  <table id="table3" summary="summary" title="title">
+    <tr><td>cell</td></tr>
+  </table>
+  
+  <svg xmlns="http://www.w3.org/2000/svg" version="1.1"
+       viewBox="0 0 100 100" preserveAspectRatio="xMidYMid slice"
+       id="svg"
+       style="width:100px; height:100px;">
+    <title>SVG Image</title>
+    <desc>SVG Image</desc>
+    <linearGradient id="gradient">
+      <stop class="begin" offset="0%"/>
+      <stop class="end" offset="100%"/>
+    </linearGradient>
+    <rect x="0" y="0" width="100" height="100" style="fill:url(#gradient)" />
+    <circle cx="50" cy="50" r="30" style="fill:url(#gradient)" />
+  </svg>
+
+  <div id="alert" role="alert">Error</div>
+  <input type="text" id="inputDescribedByAlert" aria-describedby="alert">
+</body>
+</html>