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diff --git a/testing/web-platform/tests/mathml/presentation-markup/operators/mo-axis-height-1.html b/testing/web-platform/tests/mathml/presentation-markup/operators/mo-axis-height-1.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/operators/mo-axis-height-1.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>mo axis height</title>
+<link rel="help" href="https://w3c.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
+<meta name="assert" content="Element mo correctly uses the axis height parameter from the MATH table.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/fonts.js"></script>
+<style>
+  math, mspace {
+    font-size: 10px;
+  }
+  @font-face {
+    font-family: axisheight5000-verticalarrow14000;
+    src: url("/fonts/math/axisheight5000-verticalarrow14000.woff");
+  }
+</style>
+<script>
+  var emToPx = 10 / 1000; // font-size: 10px, font.em = 1000
+  var epsilon = 5;
+
+  function getBox(aId) {
+    return document.getElementById(aId).getBoundingClientRect();
+  }
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", () => { loadAllFonts().then(runTests); });
+
+  function runTests() {
+    test(function() {
+      var v1 = 5000 * emToPx;
+      var moMiddle = (getBox("mo1").bottom + getBox("mo1").top) / 2;
+      assert_approx_equals(getBox("mo1").height,
+                           14000 * emToPx, epsilon, "mo: size");
+      assert_approx_equals(getBox("baseline1").bottom - moMiddle,
+                           v1, epsilon, "mo: axis height");
+    }, "AxisHeight (size variant)");
+
+    test(function() {
+      var v1 = 5000 * emToPx;
+      var moMiddle = (getBox("mo2").bottom + getBox("mo2").top) / 2;
+      assert_approx_equals(getBox("mo2").height,
+                           2 * (getBox("target2").height - v1),
+                           epsilon, "mo: size");
+      assert_approx_equals(getBox("baseline2").bottom - moMiddle,
+                           v1, epsilon, "mo: axis height");
+    }, "AxisHeight (glyph assembly)");
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+  <p>
+    <math style="font-family: axisheight5000-verticalarrow14000;">
+      <mrow>
+        <mspace id="baseline1" style="background: blue" width="50px" height="1px"/>
+        <mpadded voffset="50px"><mspace style="background: cyan" width="50px" height="1px"/></mpadded>
+        <mo id="mo1" symmetric="true" style="color: green">&#x21A8;</mo>
+        <mspace style="background: gray" width="10px" height="50px"/>
+      </mrow>
+    </math>
+    <math style="font-family: axisheight5000-verticalarrow14000;">
+      <mrow>
+        <mspace id="baseline2" style="background: blue" width="50px" height="1px"/>
+        <mpadded voffset="50px"><mspace style="background: cyan" width="50px" height="1px"/></mpadded>
+        <mo id="mo2" symmetric="true" style="color: green">&#x21A8;</mo>
+        <mspace id="target2" style="background: gray" width="10px" height="200px"/>
+      </mrow>
+    </math>
+</body>
+</html>