HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS color-gamut Background Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
      background-color: #3333ff;
    }

    @media (color-gamut: p3) {
      body {
        background-color: color(display-p3 0.2 1 0.35);
      }
    }

    @media (color-gamut: rec2020) {
      body {
        background-color: color(rec2020 1 0.35 0.2);
      }
    }
  </style>
</head>
<body>
  <h1>Color Gamut Demo</h1>
  <p>Blue on sRGB; vivid green on P3; orange-red on Rec. 2020.</p>
</body>
</html>

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CSS color-gamut - Progressive Background