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diff --git a/layout/reftests/mathml/mfrac-B-7.html b/layout/reftests/mathml/mfrac-B-7.html
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index 000000000..63e65e416
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+++ b/layout/reftests/mathml/mfrac-B-7.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>mfrac denomalign</title>
+    <script type="text/javascript">
+      function doTest() {
+        document.getElementById("testMfrac").removeAttribute("denomalign");
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("MozReftestInvalidate",doTest, false);
+    </script>
+  </head>
+  <body>
+    <math>
+      <mfrac id="testMfrac" style="font-size: 300%" denomalign="right">
+        <mrow><mn>a</mn><mo>+</mo><mn>b</mn><mo>+</mo><mn>c</mn><mo>+</mo><mn>d</mn><mo>+</mo><mn>e</mn></mrow>
+        <mi>x</mi>
+      </mfrac>
+    </math>
+  </body>
+</html>