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diff --git a/layout/reftests/mathml/mphantom-1.html b/layout/reftests/mathml/mphantom-1.html
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+++ b/layout/reftests/mathml/mphantom-1.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>mphantom</title>
+    <meta charset="utf-8"/>
+  </head>
+  <body>
+
+    <!-- Test different kinds of content inside <mphantom>. -->
+    <p><math>
+      <mrow style="visibility: hidden">
+        <msqrt>
+          <mfrac>
+            <mn>1</mn>
+            <mi>x</mi>
+          </mfrac>
+        </msqrt>
+        <mo>+</mo>
+        <menclose notation="box updiagonalstrike">
+          <mover>
+            <mspace width="3em" height="1em" mathbackground="red"/>
+            <mo>‾</mo>
+          </mover>
+        </menclose>
+      </mrow>
+    </math></p>
+
+  </body>
+</html>