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diff --git a/layout/reftests/mathml/mathvariant-5.html b/layout/reftests/mathml/mathvariant-5.html
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+++ b/layout/reftests/mathml/mathvariant-5.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <title>Dynamic mathvariant tests</title>
+  </head>
+  <body>
+    <math>
+      <mrow>
+        <mi id="Mi0">A</mi>
+        <mi id="Mi1">A</mi>
+        <mi id="Mi2">AA</mi>
+        <mi id="Mi3" mathvariant="fraktur">A</mi>
+        <mi id="Mi4" mathvariant="monospace">A</mi>
+        <mtext id="Mtext0" mathvariant="monospace">A</mtext>
+        <mtext id="Mtext2" mathvariant="monospace">A</mtext>
+        <mtext id="Mtext4">A</mtext>
+      </mrow>
+    </math>
+
+    <p>
+
+    <math>
+      <mrow>
+        <mstyle id="Mstyle0">
+          <mtext>Hello</mtext>
+        </mstyle>
+        <mstyle id="Mstyle1" mathvariant="bold-fraktur">
+          <mtext>Hello</mtext>
+        </mstyle>
+        <mstyle id="Mstyle2" mathvariant="bold">
+          <mtext>Hello</mtext>
+        </mstyle>
+      </mrow>
+    </math>
+
+    <p>
+
+    <math id="Math0">
+      <mtext>Hello</mtext>
+    </math>
+    <math id="Math1" mathvariant="fraktur">
+      <mtext>Hello</mtext>
+    </math>
+    <math id="Math2" mathvariant="bold">
+      <mtext>Hello</mtext>
+    </math>
+    <script>
+      function doTest()
+      {
+      document.getElementById("Mi0").setAttribute("mathvariant", "script");
+      document.getElementById("Mi1").innerHTML = "BB";
+      document.getElementById("Mi2").innerHTML = "B";
+      document.getElementById("Mi3").removeAttribute("mathvariant");
+      document.getElementById("Mi4").setAttribute("mathvariant", "script");
+      document.getElementById("Mtext0").removeAttribute("mathvariant");
+      document.getElementById("Mtext2").setAttribute("mathvariant", "script");
+      document.getElementById("Mtext4").setAttribute("mathvariant", "script");
+      document.getElementById("Mstyle0").setAttribute("mathvariant", "fraktur");
+      document.getElementById("Mstyle1").setAttribute("mathvariant", "monospace");
+      document.getElementById("Mstyle2").removeAttribute("mathvariant");
+      document.getElementById("Math0").setAttribute("mathvariant", "fraktur");
+      document.getElementById("Math1").setAttribute("mathvariant", "monospace");
+      document.getElementById("Math2").removeAttribute("mathvariant");
+
+      document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("MozReftestInvalidate", doTest);
+    </script>
+  </body>
+</html>