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diff --git a/testing/web-platform/tests/mathml/presentation-markup/scripts/munder-mover-align-accent-false.html b/testing/web-platform/tests/mathml/presentation-markup/scripts/munder-mover-align-accent-false.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/scripts/munder-mover-align-accent-false.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Horizontal alignment of base with munder/mover scripts (accent="false")</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#underscripts-and-overscripts-munder-mover-munderover">
+    <link rel="match" href="munder-mover-align-accent-false-ref.html">
+    <meta name="assert" content="base, underscript and overscript should be horizontally aligned.">
+  </head>
+  <body>
+    <table border="1">
+      <tr>
+        <th colspan="2">mover</th>
+        <th colspan="2">munder</th>
+      </tr>
+      <tr>
+        <td align="center">Over &lt; Base</td>
+        <td align="center">Over &gt; Base</td>
+        <td align="center">Under &lt; Base</td>
+        <td align="center">Under &gt; Base</td>
+      </tr>
+      <tr>
+        <td align="center">
+          <math>
+            <mover>
+              <mspace height="15px" width="75px" mathbackground="blue"/>
+              <mspace height="15px" width="25px" mathbackground="red"/>
+            </mover>
+          </math>
+        </td>
+        <td align="center">
+          <math>
+            <mover>
+              <mspace height="15px" width="25px" mathbackground="blue"/>
+              <mspace height="15px" width="75px" mathbackground="red"/>
+            </mover>
+          </math>
+        </td>
+        <td align="center">
+          <math>
+            <munder>
+              <mspace height="15px" width="75px" mathbackground="blue"/>
+              <mspace height="15px" width="25px" mathbackground="red"/>
+            </munder>
+          </math>
+        </td>
+        <td align="center">
+          <math>
+            <munder>
+              <mspace height="15px" width="25px" mathbackground="blue"/>
+              <mspace height="15px" width="75px" mathbackground="red"/>
+            </munder>
+          </math>
+        </td>
+      </tr>
+    </table>
+  </body>
+</html>