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diff --git a/testing/web-platform/mozilla/tests/mathml/scripts/mmultiscripts-empty-scripts.html b/testing/web-platform/mozilla/tests/mathml/scripts/mmultiscripts-empty-scripts.html
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+++ b/testing/web-platform/mozilla/tests/mathml/scripts/mmultiscripts-empty-scripts.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Comparison of script elements</title>
+    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=669932">
+    <link rel="match" href="mmultiscripts-empty-scripts-ref.html">
+    <meta name="assert" content="Verify elements with empty sub/sup scripts render the same as equivalent elements with less scripts.">
+  </head>
+  <body>
+    msubsup:
+    <math>
+      <msubsup 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>
+        <mtext style="background-color: rgba(0, 255, 0, 0.4);">ccc</mtext>
+      </msubsup>
+    </math>
+
+    <br><br>
+
+    <!-- Different rules apply to msub, so it won't provide equivalent output -->
+    msubsup:
+    <math>
+      <msubsup 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>
+        <mrow></mrow>
+      </msubsup>
+    </math>
+
+    <br><br>
+
+    msup / msubsup:
+    <math>
+      <msup 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>
+      </msup>
+    </math>
+
+    <math>
+      <msubsup style="background: red;">
+        <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+        <mrow></mrow>
+        <mtext style="background-color: rgba(0, 255, 0, 0.4);">bbb</mtext>
+      </msubsup>
+    </math>
+
+    <br><br>
+
+    mrow / msub:
+    <math>
+      <mrow style="background: red;">
+        <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+      </mrow>
+    </math>
+
+    <math>
+      <msub style="background: red;">
+        <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+        <mrow></mrow>
+      </msub>
+    </math>
+
+    <br><br>
+
+    msupsub:
+    <math>
+      <msubsup style="background: red;">
+        <mtext style="background-color: rgba(0, 0, 255, 0.4);">AAA</mtext>
+        <mrow></mrow>
+        <mrow></mrow>
+      </msubsup>
+    </math>
+
+  </body>
+</html>