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

<!DOCTYPE html>
<meta charset="utf-8">
<title>Green square color(display-p3 0 1 0) reference</title>
<style>
    .test { background-color: color(display-p3 0 1 0); width: 12em; height: 12em; }
</style>
<body>
    <p>Test passes if you see a green square, and no red.</p>
    <div class="test"></div>
</body>