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diff --git a/testing/web-platform/tests/css/css-highlight-api/painting/custom-highlight-container-metrics-002.html b/testing/web-platform/tests/css/css-highlight-api/painting/custom-highlight-container-metrics-002.html
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+++ b/testing/web-platform/tests/css/css-highlight-api/painting/custom-highlight-container-metrics-002.html
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+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>CSS Highlight API Test: Highlights using container sizes</title>
+<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
+<link rel="help" href="https://drafts.csswg.org/css-pseudo/#highlight-styling">
+<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-lengths">
+<link rel="match" href="custom-highlight-container-metrics-002-ref.html">
+<meta name="assert" value="lengths depending on containers take the correct values inside and outside a container">
+<meta name="fuzzy" content="0-60;0-25">
+<head>
+  <style>
+    .wrapper {
+      container: wrapper / size;
+      width: 200px;
+      height: 100px;
+    }
+    ::highlight(highlight1) {
+      text-underline-offset: 2cqw;
+      text-decoration-line: underline;
+      text-decoration-color: green;
+      text-decoration-thickness: 4cqh;
+    }
+</style>
+</head>
+<body>
+  <div class="wrapper">
+    <div id="h1">With container size</div>
+  </div>
+  <div id="h2">Without container size</div>
+  <script>
+    let r1 = new Range();
+    r1.setStart(h1, 0);
+    r1.setEnd(h1, 1);
+    let r2 = new Range();
+    r2.setStart(h2, 0);
+    r2.setEnd(h2, 1);
+    CSS.highlights.set("highlight1", new Highlight(r1, r2));
+  </script>
+</body>