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chromium/third_party/blink/web_tests/external/wpt/css/css-color/display-p3-002.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Color 4: display-p3</title>
<link rel="author" title="Chris Lilley" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#valdef-color-display-p3">
<link rel="help" href="https://drafts.csswg.org/css-color-4/#predefined-to-predefined">
<link rel="match" href="blacksquare-ref.html">
<meta name="assert" content="display-p3 with no alpha">
<style>
    .test { background-color: red; width: 12em; height: 12em; }
    .test { background-color: color(display-p3 0 0 0); } /* black (sRGB #000000) converted to display-p3 */
</style>
<body>
    <p>Test passes if you see a black square, and no red.</p>
    <div class="test"></div>
</body>