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diff --git a/layout/reftests/mathml/semantics-1.xhtml b/layout/reftests/mathml/semantics-1.xhtml
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+++ b/layout/reftests/mathml/semantics-1.xhtml
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+<?xml version="1.0" encoding="utf-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <meta http-equiv="content-type"
+  content="application/xhtml+xml; charset=utf-8" />
+  <title>Various tests for semantics</title>
+</head>
+
+<body>
+<!-- displaystyle (bug 468059) -->
+<p><math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
+    <semantics>
+      <munderover>
+        <mo movablelimits="true">□■□</mo>
+        <mtext>■□■□■□</mtext>
+        <mtext>■□■□■□</mtext>
+      </munderover>
+    </semantics>
+</math></p>
+
+<!-- embellished operator (bug 21479) -->
+<p><math xmlns="http://www.w3.org/1998/Math/MathML">
+  <mover>
+    <mspace width="300px" height="10px" mathbackground="black"></mspace>
+    <semantics><mo>&#xaf;</mo></semantics>
+  </mover>
+</math></p>
+
+<!-- unwanted whitespace (bug 512418) -->
+<p>■□■□■□<math xmlns="http://www.w3.org/1998/Math/MathML">
+  <semantics>
+    <mrow>
+      <mrow>
+        <mo>lcm</mo>
+        <mo>(</mo>
+        <mi>a</mi>
+        <mo>,</mo>
+        <mi>b</mi>
+        <mo>)</mo>
+      </mrow>
+      <mo>=</mo>
+      <mfrac>
+        <mrow>
+          <mo>(</mo>
+          <mi>a</mi>
+          <mo>&#x2062;</mo>
+          <mi>b</mi>
+          <mo>)</mo>
+        </mrow>
+        <mrow>
+          <mo>gcd</mo>
+          <mo>(</mo>
+          <mi>a</mi>
+          <mo>,</mo>
+          <mi>b</mi>
+          <mo>)</mo>
+        </mrow>
+      </mfrac>
+    </mrow>
+  </semantics>
+</math>■□■□■□</p>
+
+<!-- maction and semantics (bug 523037) -->
+<p>■□■□■□<math xmlns="http://www.w3.org/1998/Math/MathML">
+  <maction actiontype="toggle" selection="3">
+    <mn>1</mn>
+    <mn>2</mn>
+    <semantics>
+      <mn>3</mn>
+      <annotation encoding="text">three</annotation>
+    </semantics>
+    <semantics>
+      <mn>4</mn>
+      <annotation encoding="text">four</annotation>
+    </semantics>
+    <mn>5</mn>
+  </maction>
+</math>■□■□■□</p>
+
+<!-- maction and semantics (bug 523045) -->
+<p>■□■□■□<math xmlns="http://www.w3.org/1998/Math/MathML">
+  <maction actiontype="toggle" selection="4">
+    <mn>1</mn>
+    <mn>2</mn>
+    <semantics>
+      <mn>3</mn>
+      <annotation encoding="text">three</annotation>
+    </semantics>
+    <semantics>
+      <mn>4</mn>
+      <annotation encoding="text">four</annotation>
+    </semantics>
+    <mn>5</mn>
+  </maction>
+</math>■□■□■□</p>
+</body>
+</html>