HTML Code

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

    h2 {
      margin: 0 0 0.65rem;
      font-size: 1.125rem;
    }

    p {
      margin: 0 0 0.55rem;
      font-size: 0.9375rem;
      color: #334155;
      line-height: 1.5;
    }

    h2:only-of-type {
      color: #b91c1c;
      border-bottom: 2px solid #fecaca;
      padding-bottom: 0.35rem;
    }
  </style>
</head>
<body>
  <article>
    <h2>Article Title</h2>
    <p>First paragraph of the article.</p>
    <p>Second paragraph of the article.</p>
  </article>
</body>
</html>

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CSS :only-of-type - Lone Heading in Article