HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>update: fast</title>
  <style>
    @keyframes jiggle {
      from { transform: translateY(0); }
      to { transform: translateY(8px); }
    }

    @media (update: fast) {
      p {
        animation: 1s jiggle linear alternate infinite;
      }
    }
  </style>
</head>
<body>
  <p>Fast update demo</p>
</body>
</html>

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CSS update Media Feature — fast