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diff --git a/testing/web-platform/tests/mathml/presentation-markup/scripts/mmultiscript-003.html b/testing/web-platform/tests/mathml/presentation-markup/scripts/mmultiscript-003.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>alignment of mmultiscript sub/superscripts</title>
+    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=928675">
+    <link rel="help" href="https://w3c.github.io/mathml-core/#base-with-prescripts-and-postscripts">
+    <link rel="match" href="mmultiscript-003-ref.html">
+    <meta name="assert" content="In LTR mode, pre-scripts are right-aligned and post-scripts are left-aligned.">
+  </head>
+  <body>
+    <math>
+      <mmultiscripts>
+        <mspace width="50px" height="50px" mathbackground="red"/>
+        <mrow>
+          <mspace width="50px" height="10px" mathbackground="blue"/>
+        </mrow>
+        <mspace width="100px" height="10px" mathbackground="green"/>
+        <mprescripts/>
+        <mrow>
+          <mspace width="50px" height="10px" mathbackground="blue"/>
+        </mrow>
+        <mspace width="100px" height="10px" mathbackground="green"/>
+      </mmultiscripts>
+    </math>
+    <br/>
+    <br/>
+    <math>
+      <mmultiscripts>
+        <mspace width="50px" height="50px" mathbackground="red"/>
+        <mspace width="100px" height="10px" mathbackground="green"/>
+        <mrow>
+          <mspace width="50px" height="10px" mathbackground="blue"/>
+        </mrow>
+        <mprescripts/>
+        <mspace width="100px" height="10px" mathbackground="green"/>
+        <mrow>
+          <mspace width="50px" height="10px" mathbackground="blue"/>
+        </mrow>
+      </mmultiscripts>
+    </math>
+  </body>
+</html>