oklch-l-almost-1-ref.html

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<!DOCTYPE html>

<meta charset="utf-8">

<style>

    .ref { background-color: oklch(1 0.2 45); 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>