HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery href contains pdf</title>
  <style>
    a { display: block; margin: 8px 0; }
    .pdf-link { color: #b91c1c; font-weight: bold; }
  </style>
</head>
<body>
  <a href="/docs/guide.pdf">Guide (PDF)</a>
  <a href="/files/annual-report.pdf">Annual report</a>
  <a href="/about">About page</a>
  <a href="/contact">Contact</a>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("a[href*='.pdf']").addClass("pdf-link");
  </script>
</body>
</html>

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jQuery a[href*='.pdf'] — link filter (Try It)