HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS update fast Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      text-align: center;
    }

    .badge {
      display: inline-block;
      padding: 0.75rem 1.25rem;
      background: #dbeafe;
      color: #1e3a8a;
      border-radius: 0.5rem;
      font-weight: 600;
    }

    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }

    @media (update: fast) {
      .badge {
        animation: bounce 1s ease-in-out infinite;
        background: #3b82f6;
        color: #fff;
      }
    }
  </style>
</head>
<body>
  <h1>Fast Update Demo</h1>
  <p class="badge">Bounces on fast-updating screens</p>
</body>
</html>

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CSS update - Animation on Fast