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+++ b/testing/web-platform/tests/mathml/relations/css-styling/width-height-001.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>width, height, inline-size and block-size</title>
+<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
+<meta name="assert" content="Verify that width, height, inline-size and block-size properties are ignored.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/mathml/support/feature-detection.js"></script>
+<script src="/mathml/support/mathml-fragments.js"></script>
+<script src="/mathml/support/box-comparison.js"></script>
+<style>
+  /* Revert style specified in the UA style sheet that changes box size. */
+  merror { border: 0; }
+  mfrac { padding: 0; }
+</style>
+<script>
+  var epsilon = 1;
+
+  setup({ explicit_done: true });
+  window.addEventListener("load", runTests);
+
+  function runTests() {
+
+    for (tag in MathMLFragments) {
+        if (!FragmentHelper.isValidChildOfMrow(tag))
+            continue;
+
+        document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;"><math><mrow>${MathMLFragments[tag]}</mrow></math></div>`);
+        let div = document.body.lastElementChild;
+        let element = FragmentHelper.element(div.firstElementChild);
+
+        test(function() {
+            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
+            var style = `width: 500px; height: 400px;`;
+            element.setAttribute("style", style);
+            let box = element.getBoundingClientRect();
+            assert_approx_equals(box.width, 500, epsilon, "width");
+            assert_approx_equals(box.height, 400, epsilon, "height");
+        }, `width and height properties on ${tag}`);
+
+        test(function() {
+            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
+            var style = `inline-size: 600px; block-size: 700px;`;
+            element.setAttribute("style", style);
+            let box = element.getBoundingClientRect();
+            assert_approx_equals(box.width, 600, epsilon, "width");
+            assert_approx_equals(box.height, 700, epsilon, "height");
+        }, `inline-size and block-size properties on ${tag}`);
+
+        div.style = "display: none;"; // Hide the div after measurement.
+    }
+
+    done();
+  }
+</script>
+</head>
+<body>
+  <div id="log"></div>
+</body>
+</html>