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diff --git a/testing/web-platform/tests/mathml/presentation-markup/menclose/legacy-menclose-radical-notation.html b/testing/web-platform/tests/mathml/presentation-markup/menclose/legacy-menclose-radical-notation.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/menclose/legacy-menclose-radical-notation.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>Legacy menclose radical notation</title>
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.menclose">
+    <link rel="help" href="https://www.w3.org/TR/MathML3/chapter3.html#presm.menclose">
+    <meta name="assert" content="Verify that the legacy menclose radical notation is ignored.">
+    <link rel="match" href="legacy-menclose-radical-notation-ref.html">
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <style>
+      math, math * {
+          font: 25px Ahem;
+      }
+    </style>
+  </head>
+  <body>
+    <math>
+      <menclose notation="radical">
+        <mn>123</mn>
+      </menclose>
+      <menclose notation="box radical">
+        <mn>123</mn>
+      </menclose>
+    </math>
+
+   <script src="/mathml/support/feature-detection.js"></script>
+   <script>MathMLFeatureDetection.ensure_for_match_reftest("has_menclose");</script>
+  </body>
+</html>