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diff --git a/layout/reftests/mathml/dir-3.html b/layout/reftests/mathml/dir-3.html
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+++ b/layout/reftests/mathml/dir-3.html
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+<!DOCTYPE html>
+<html>
+  <head><title>Test dir=rtl</title></head>
+  <body style="background: white;">
+
+    <!-- The visible part of the formulas below should be covered by the
+         black rectangle when dir=rtl -->
+
+    <div style="position: absolute; top: 5px; left: 5px;">
+      <!-- msup -->
+      <math dir="rtl">
+        <msup>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="red"/>
+        </msup>
+      </math><br/>
+      <!-- msub -->
+      <math dir="rtl">
+        <msub>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="orange"/>
+        </msub>
+      </math><br/>
+      <!-- msubsup -->
+      <math dir="rtl">
+        <msubsup>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px" mathbackground="green"/>
+          <mspace width="20px" height="20px" mathbackground="blue"/>
+        </msubsup>
+      </math><br/>
+      <!-- mmultiscripts -->
+      <math dir="rtl">
+        <mmultiscripts>
+          <mspace/>
+          <mspace width="20px" height="20px" mathbackground="cyan"/>
+          <mspace width="20px" height="20px" mathbackground="yellow"/>
+          <mprescripts/>
+          <mspace width="20px" height="20px"/>
+          <mspace width="20px" height="20px"/>
+        </mmultiscripts>
+      </math><br/>
+      <!-- munder (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <munder>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="magenta"/>
+        </munder>
+      </math><br/>
+      <!-- mover (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <mover>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="cyan"/>
+        </mover>
+      </math><br/>
+      <!-- munderover (mo with movablelimits=true and displaystyle=false) -->
+      <math dir="rtl">
+        <munderover>
+          <mpadded width="20px">
+            <mphantom>
+              <mo movablelimits="true" displaystyle="false">|</mo>
+            </mphantom>
+          </mpadded>
+          <mspace width="20px" height="20px" mathbackground="yellow"/>
+          <mspace width="20px" height="20px" mathbackground="grey"/>
+        </munderover>
+      </math><br/>
+      <!-- mroot -->
+      <math dir="rtl">
+        <mstyle mathcolor="white">
+          <mroot>
+            <mspace width="20px" height="20px" mathbackground="orange"/>
+            <mspace width="20px" height="20px"/>
+          </mroot>
+        </mstyle>
+      </math><br/>
+      <!-- msqrt -->
+      <math dir="rtl">
+        <mstyle mathcolor="white">
+          <msqrt>
+            <!-- Here, we assume that (width of radical + width of mspace)
+                 is greater than the width of the black rectangle (i.e.
+                 width of radical > 30 - 25 = 5px), so the test fails if the
+                 radical is placed on the left. -->
+            <mspace width="25px" height="20px" mathbackground="grey"/>
+          </msqrt>
+        </mstyle>
+      </math>
+    </div>
+
+    <div style="position: absolute; top: 5px; left: 5px;">
+      <div style="width: 30px; height: 500px; background: black;"></div>
+    </div>
+
+  </body>
+</html>