HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :only-of-type Basic Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      max-width: 28rem;
    }

    .container {
      margin-bottom: 1rem;
      padding: 0.85rem 1rem;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
    }

    p {
      margin: 0 0 0.5rem;
      font-size: 0.9375rem;
      color: #334155;
    }

    p:last-child {
      margin-bottom: 0;
    }

    p:only-of-type {
      color: #1d4ed8;
      font-weight: 700;
    }
  </style>
</head>
<body>
  <h1>Containers</h1>
  <div class="container">
    <p>This is a paragraph inside a div.</p>
  </div>
  <div class="container">
    <p>This is another paragraph inside a div.</p>
    <p>This is a second paragraph inside the same div.</p>
  </div>
</body>
</html>

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CSS :only-of-type - Solo vs Multiple Paragraphs