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diff --git a/layout/mathml/tests/stretchy-and-large-operators.html b/layout/mathml/tests/stretchy-and-large-operators.html
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+<!-- -*- mode: HTML; tab-width: 2; indent-tabs-mode: nil; -*- -->
+<!-- vim: set tabstop=2 expandtab shiftwidth=2 textwidth=80:  -->
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test Stretchy and Large Operators</title>
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+    <script type="text/javascript"
+            src="stretchy-and-large-operators.js"></script>
+    <script type="text/javascript">
+
+      var mathml = "http://www.w3.org/1998/Math/MathML";
+
+      function createMo(aOperator, aForm)
+      {
+        var mo = document.createElementNS(mathml, "mo");
+        mo.appendChild(document.createTextNode(aOperator));
+        mo.setAttribute("form", aForm);
+        return mo;
+      }
+
+      function createTest(aEntry)
+      {
+        var opname = aEntry[0];
+        var operator = aEntry[1];
+        var type = aEntry[2];
+        var form = aEntry[3];
+
+        var div = document.createElement("div");
+        div.appendChild(document.createTextNode(opname));
+
+        var math = document.createElementNS(mathml, "math");
+
+        switch (type)
+        {
+          case "l": // largeop
+            math.appendChild(createMo(operator, form));
+            var mstyle = document.createElementNS(mathml, "mstyle");
+            mstyle.setAttribute("displaystyle", "true");
+            mstyle.appendChild(createMo(operator, form));
+            math.appendChild(mstyle);
+          break;
+
+          case "v": // vertical
+            for (var i = 1; i < 10; i+=2) {
+              var mo = createMo(operator, form);
+              mo.setAttribute("minsize", (.5 * i) + "em");
+              math.appendChild(mo);
+            }
+          break;
+
+          case "h": // horizontal
+            for (var i = 1; i < 10; i+=2) {
+              var mo = createMo(operator, form);
+              var mspace = document.createElementNS(mathml, "mspace");
+              mspace.setAttribute("width", (.5 * i) + "em");
+              var mover = document.createElementNS(mathml, "mover");
+              mover.setAttribute("accent", "false");
+              mover.appendChild(mspace);
+              mover.appendChild(mo);
+              math.appendChild(mover);
+            }
+          break;
+
+          default:
+          break;
+        }
+
+        div.appendChild(math);
+        document.body.appendChild(div);
+      }
+
+      function init()
+      {
+        for (var i in stretchy_and_large_operators) {
+          createTest(stretchy_and_large_operators[i]);
+        }
+      }
+    </script>
+  </head>
+
+  <body onload="init()">
+
+ </body>
+</html>