HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>transition-duration: initial</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    button {
      background: #2563eb;
      color: #fff;
      border: 0;
      padding: 12px 16px;
      font: inherit;
      cursor: pointer;
      margin-right: 8px;
      transition-property: background-color;
      transition-duration: 1s;
    }

    button.reset {
      transition-duration: initial;
    }

    button:hover,
    button:focus-visible {
      background: #16a34a;
    }
  </style>
</head>
<body>
  <p>First button uses <strong>1s</strong>. Second resets with <strong>initial</strong> (0s).</p>
  <button type="button">1s</button>
  <button type="button" class="reset">initial</button>
</body>
</html>

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CSS transition-duration Property — initial