HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>filter header demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }
    #content, #sidebar { padding: 12px; margin: 8px 0; border: 1px solid #e2e8f0; border-radius: 6px; }
  </style>
</head>
<body>
  <div id="content">
    <h2>Main Title</h2>
    <p>Article body text.</p>
    <h3>Subsection</h3>
  </div>
  <aside id="sidebar">
    <h4>Sidebar Title</h4>
    <p>Not styled — outside #content scope.</p>
  </aside>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#content *").filter(":header").css({ background: "#ccc", color: "blue" });
  </script>
</body>
</html>

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.filter(":header") — scoped pattern (Try It)