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diff --git a/testing/web-platform/tests/quirks/unitless-length/excluded-properties-003.html b/testing/web-platform/tests/quirks/unitless-length/excluded-properties-003.html
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+++ b/testing/web-platform/tests/quirks/unitless-length/excluded-properties-003.html
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+<html>
+<head>
+<meta charset="utf-8">
+<title>inset does not support quirky-length</title>
+<link rel="help" href="https://quirks.spec.whatwg.org/#the-unitless-length-quirk">
+<meta name="assert" content="quirky-length is not supported by inset.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+'use strict';
+
+test(() => {
+  const quirky_values = [
+    '1',
+    '1 2px',
+    '1px 2',
+    '1 2',
+    '1 2px 3px',
+    '1px 2 3px',
+    '1px 2px 3',
+    '1 2 3',
+    '1 2px 3px 4px',
+    '1px 2 3px 4px',
+    '1px 2px 3 4px',
+    '1px 2px 3px 4',
+    '1 2 3 4'
+  ];
+
+  target.style['inset'] = '5px 6px 7px 8px';
+
+  for (let value of quirky_values) {
+    target.style['inset'] = value;
+    assert_equals(target.style['inset'], '5px 6px 7px 8px', 'inset rejects quirky length "' + value + '"');
+  }
+}, 'inset does not support quirky length values');
+
+</script>
+</body>
+</html>