HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>target highlight</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    nav a { margin-right: 12px; }
    section { margin: 24px 0; padding: 12px; border: 1px solid #e2e8f0; }
    .is-highlighted { background: #fef3c7; border-left: 4px solid #f59e0b; }
  </style>
</head>
<body>
  <nav>
    <a href="#intro">Intro</a>
    <a href="#about">About</a>
  </nav>
  <section id="intro"><h2>Intro</h2><p>First section.</p></section>
  <section id="about"><h2>About</h2><p>Second section — try #about in the URL.</p></section>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(":target").addClass("is-highlighted");
  </script>
</body>
</html>

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