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diff --git a/testing/web-platform/tests/mathml/presentation-markup/operators/mo-movablelimits-from-in-flow.html b/testing/web-platform/tests/mathml/presentation-markup/operators/mo-movablelimits-from-in-flow.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/operators/mo-movablelimits-from-in-flow.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <title>&lt;mo&gt; movablelimits</title>
+    <link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
+    <meta name="assert" content="Verify movablelimits is read from the first in-flow child.">
+    <style>
+      math, math * {
+          font: 25px/1 Ahem;
+      }
+      .oof1 {
+          position: absolute;
+      }
+      .oof2 {
+          position: fixed;
+      }
+      .nobox {
+          display: none;
+      }
+    </style>
+    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+    <link rel="match" href="mo-movablelimits-from-in-flow-ref.html">
+  </head>
+  <body>
+    <math>
+      <munder>
+        <mo class="oof1" movablelimits="false"></mo>
+        <mo class="oof2" movablelimits="false"></mo>
+        <mo class="nobox" movablelimits="false"></mo>
+        <mo lspace="0px" rspace="0px" movablelimits="true">+</mo>
+        <mn>1</mn>
+      </munder>
+      <mover>
+        <mo class="oof1" movablelimits="false"></mo>
+        <mo class="oof2" movablelimits="false"></mo>
+        <mo class="nobox" movablelimits="false"></mo>
+        <mo lspace="0px" rspace="0px" movablelimits="true">+</mo>
+        <mn>1</mn>
+      </mover>
+      <munderover>
+        <mo class="oof1" movablelimits="false"></mo>
+        <mo class="oof2" movablelimits="false"></mo>
+        <mo class="nobox" movablelimits="false"></mo>
+        <mo lspace="0px" rspace="0px" movablelimits="true">+</mo>
+        <mn>1</mn>
+        <mn>2</mn>
+      </munderover>
+    </math>
+    <script src="/mathml/support/feature-detection.js"></script>
+    <script>MathMLFeatureDetection.ensure_for_match_reftest("has_munderover");</script>
+  </body>
+</html>