HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>article only-of-type</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    article { margin: 16px 0; padding: 12px; border: 1px solid #ddd; }
  </style>
</head>
<body>
  <article>
    <h2>News</h2>
    <p>This is the only paragraph in this article block.</p>
  </article>
  <article>
    <h2>Report</h2>
    <p>First paragraph.</p>
    <p>Second paragraph.</p>
  </article>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("article p:only-of-type").css({ fontSize: "1.125rem", lineHeight: "1.7" });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

article p:only-of-type lead paragraph (Try It)