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diff --git a/testing/web-platform/tests/mathml/presentation-markup/scripts/subsup-5.html b/testing/web-platform/tests/mathml/presentation-markup/scripts/subsup-5.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/scripts/subsup-5.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Subscripts and Superscripts metrics</title>
+<link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">
+<meta name="assert" content="Verify metrics of scripted elements with tall scripts.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/feature-detection.js"></script>
+<style>
+  math, mspace {
+    font-size: 10px;
+  }
+</style>
+<script>
+  /* This test does not use any specific fonts and so the exact rules are not
+  specified precisely. We assume reasonable values for script shifts and
+  spacing. */
+
+  function getBox(aId) {
+    var box = document.getElementById(aId).getBoundingClientRect();
+    box.middle = (box.bottom + box.top) / 2;
+    return box;
+  }
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  var sizeArray = [50, 75, 100];
+
+  function runTests() {
+    test(function() {
+      assert_true(MathMLFeatureDetection.has_mspace());
+
+      var e = 1;
+       assert_approx_equals(getBox("msubbase").middle, getBox("baseline").bottom, e, "msub base is placed on the baseline");
+       assert_approx_equals(getBox("msupbase").middle, getBox("baseline").bottom, e, "msup base is placed on the baseline");
+       assert_approx_equals(getBox("msubsupbase").middle, getBox("baseline").bottom, e, "msubsup base is placed on the baseline");
+       assert_approx_equals(getBox("multibase").middle, getBox("baseline").bottom, e, "mmultiscripts baseis placed on the baseline");
+    }, "Alignment on the baseline with different and large script heights");
+
+    test(function() {
+      assert_true(MathMLFeatureDetection.has_mspace());
+
+      assert_greater_than(getBox("msubsub").top, getBox("msubbase").top, "msub: subscript is below the top of the base");
+      assert_less_than(getBox("msupsup").bottom, getBox("msupbase").bottom, "msup: supscript is above the bottom of the base");
+      assert_greater_than(getBox("msubsupsub").top, getBox("msubsupbase").top, "msubsup: subscript is below the top of the base");
+      assert_less_than(getBox("msubsupsup").bottom, getBox("msubsupbase").bottom, "msubsup: supscript is above the bottom of the base");
+      assert_greater_than(getBox("multipostsub").top, getBox("multibase").top, "mmultiscripts: postsubscript is below the top of the base");
+      assert_less_than(getBox("multipostsup").bottom, getBox("multibase").bottom, "mmultiscripts: postsupscript is above the bottom of the base");
+      assert_greater_than(getBox("multipresub").top, getBox("multibase").top, "mmultiscripts: presubscript is below the top of the base");
+      assert_less_than(getBox("multipresup").bottom, getBox("multibase").bottom, "mmultiscripts: presupscript is above the bottom of the base");
+    }, "Tall subscripts/superscripts are not placed too high/low");
+
+    test(function() {
+      assert_true(MathMLFeatureDetection.has_mspace());
+
+      assert_greater_than(getBox("msubsupsub").top, getBox("msubsupsup").bottom, "msubsup: subscript is below the superscript");
+      assert_greater_than(getBox("multipresub").top, getBox("multipresup").bottom, "mmultiscripts: presubscript is below the presuperscript");
+      assert_greater_than(getBox("multipostsub").top, getBox("multipostsup").bottom, "mmultiscripts: postsubscript is below the postsuperscript");
+    }, "No collisions for tall subscripts and superscripts");
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+  <p>
+    <math>
+      <mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/>
+      <msub id="msub">
+        <mspace id="msubbase" width="30px" height="15px" depth="15px" style="background: black"/>
+        <mspace id="msubsub" width="10px" height="50px" depth="50px" style="background: black"/>
+      </msub>
+      <msup id="msup">
+        <mspace id="msupbase" width="30px" height="15px" depth="15px" style="background: black"/>
+        <mspace id="msupsup" width="10px" height="75px" depth="75px" style="background: black"/>
+      </msup>
+      <msubsup id="msubsup">
+        <mspace id="msubsupbase" width="30px" height="15px" depth="15px" style="background: black"/>
+        <mspace id="msubsupsub" width="10px" height="50px" depth="50px" style="background: black"/>
+        <mspace id="msubsupsup" width="10px" height="75px" depth="75px" style="background: black"/>
+      </msubsup>
+      <mmultiscripts id="multi">
+        <mspace id="multibase" width="30px" height="15px" depth="15px" style="background: black"/>
+        <mspace id="multipostsub" width="10px" height="50px" depth="50px" style="background: black"/>
+        <mspace id="multipostsup" width="10px" height="75px" depth="75px" style="background: black"/>
+        <mprescripts/>
+        <mspace id="multipresub" width="10px" height="50px" depth="50px" style="background: black"/>
+        <mspace id="multipresup" width="10px" height="75px" depth="75px" style="background: black"/>
+      </mmultiscripts>
+    </math>
+  </p>
+</body>
+</html>