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diff --git a/testing/web-platform/mozilla/tests/mathml/scripts/munderover-empty-scripts.html b/testing/web-platform/mozilla/tests/mathml/scripts/munderover-empty-scripts.html
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+++ b/testing/web-platform/mozilla/tests/mathml/scripts/munderover-empty-scripts.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test munderover with empty scripts</title>
+    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=669932">
+    <link rel="match" href="munderover-empty-scripts-ref.html">
+    <meta name="assert" content="Verify elements with empty under/over scripts render the same as equivalent elements with less scripts.">
+  </head>
+  <body>
+
+    <p>munder / munderover with empty overscript:
+      <math>
+        <munder style="background: red;">
+          <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+          <mtext style="background-color: rgba(0, 255, 0, 0.4);">bbb</mtext>
+        </munder>
+      </math>
+    </p>
+
+    <p>mover / munderover with empty underscript:
+      <math>
+        <mover style="background: red;">
+          <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+          <mtext style="background-color: rgba(0, 255, 0, 0.4);">bbb</mtext>
+        </mover>
+      </math>
+    </p>
+
+    <p>mrow / munder with empty scripts:
+      <math>
+        <mrow style="background: red;">
+          <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+        </mrow>
+      </math>
+    </p>
+
+  </body>
+</html>