HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :only-of-type Mixed Siblings Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      max-width: 26rem;
    }

    p {
      margin: 0 0 0.65rem;
      font-size: 0.9375rem;
      color: #334155;
      line-height: 1.5;
    }

    p:only-of-type {
      background: #dcfce7;
      border-left: 4px solid #16a34a;
      padding: 0.5rem 0.65rem;
      border-radius: 0.25rem;
    }

    .footer {
      padding: 0.5rem 0.65rem;
      font-size: 0.8125rem;
      color: #64748b;
      background: #e2e8f0;
      border-radius: 0.35rem;
    }
  </style>
</head>
<body>
  <h1>Article</h1>
  <article>
    <p>Lone paragraph in this section.</p>
    <div class="footer">Share link</div>
  </article>
  <p><small>Matches :only-of-type but not :only-child.</small></p>
</body>
</html>

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CSS :only-of-type - Paragraph with Div Sibling