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chromium/third_party/blink/web_tests/external/wpt/css/css-color/lab-l-over-100-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Color 4: Verify lightness in Lab is always clamped to a value between 0 to 100</title>
<style>
    .ref { background-color: lab(100 150 20); border: 1px solid black; width: 200px; height: 200px}
</style>

<body>
    <p>Test passes if you see a square border with a single color inside.</p>
    <div class="ref"></div>
</body>