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diff --git a/testing/web-platform/tests/css/css-fonts/parsing/font-weight-computed.html b/testing/web-platform/tests/css/css-fonts/parsing/font-weight-computed.html
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+++ b/testing/web-platform/tests/css/css-fonts/parsing/font-weight-computed.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Fonts Module Level 3: getComputedStyle().fontWeight</title>
+<link rel="help" href="https://www.w3.org/TR/css-fonts-3/#font-weight-prop">
+<meta name="assert" content="font-weight computed value is a number.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="container">
+  <div id="target"></div>
+</div>
+<script>
+'use strict';
+test_computed_value('font-weight', 'normal', '400');
+test_computed_value('font-weight', 'bold', '700');
+test_computed_value('font-weight', '100');
+test_computed_value('font-weight', '200');
+test_computed_value('font-weight', '300');
+test_computed_value('font-weight', '400');
+test_computed_value('font-weight', '500');
+test_computed_value('font-weight', '600');
+test_computed_value('font-weight', '700');
+test_computed_value('font-weight', '800');
+test_computed_value('font-weight', '900');
+
+function test_relative(specified, inherited, computed) {
+  test(() => {
+    const container = document.getElementById('container');
+    const target = document.getElementById('target');
+    container.style.fontWeight = inherited;
+    target.style.fontWeight = specified;
+    assert_equals(getComputedStyle(target).fontWeight, computed);
+  }, inherited + ' made ' + specified + ' computes to ' + computed);
+}
+
+test_relative('bolder', '100', '400');
+test_relative('bolder', '200', '400');
+test_relative('bolder', '300', '400');
+test_relative('bolder', '400', '700');
+test_relative('bolder', '500', '700');
+test_relative('bolder', '600', '900');
+test_relative('bolder', '700', '900');
+test_relative('bolder', '800', '900');
+test_relative('bolder', '900', '900');
+
+test_relative('lighter', '100', '100');
+test_relative('lighter', '200', '100');
+test_relative('lighter', '300', '100');
+test_relative('lighter', '400', '100');
+test_relative('lighter', '500', '100');
+test_relative('lighter', '600', '400');
+test_relative('lighter', '700', '400');
+test_relative('lighter', '800', '700');
+test_relative('lighter', '900', '700');
+</script>
+</body>
+</html>