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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>munder/mover/munderover align (reference)</title>
+  </head>
+  <body>
+    <p>Test passes if the center of the following rectangles is aligned
+      on the same vertical axis.</p>
+    <p>
+      <math>
+        <munder>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </munder>
+      </math>
+    </p>
+    <p>
+      <math>
+        <munder>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </munder>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mover>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </mover>
+      </math>
+    </p>
+    <p>
+      <math>
+        <mover>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </mover>
+      </math>
+    </p>
+    <p>
+      <math>
+        <munderover>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </munderover>
+      </math>
+    </p>
+    <p>
+      <math>
+        <munderover>
+          <mspace width="30px" height="20px" style="background: cyan;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+          <mspace width="10px" height="20px" style="background: blue;"></mspace>
+        </munderover>
+      </math>
+    </p>
+  </body>
+</html>