css/css-color/oklab-002.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Color 4: OKLab and OKLCH</title>
<link rel="author" title="Sam Weinig" href="mailto:weinig@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#specifying-oklab-oklch">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#predefined-to-lab-oklab">
<link rel="match" href="blacksquare-ref.html">
<meta name="assert" content="oklab() with no alpha">
<style>
    .test { background-color: red; width: 12em; height: 12em; }
    .test { background-color: oklab(0% 0 0); } /* black (sRGB #000000) converted to OKLab */
</style>
<body>
    <p>Test passes if you see a black square, and no red.</p>
    <div class="test"></div>
</body>