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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>jQuery contains selector demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    div { padding: 8px; margin: 6px 0; background: #f1f5f9; }

  </style>

</head>

<body>

  <div>John Resig</div>

  <div>George Martin</div>

  <div>Malcom John Sinclair</div>

  <div>J. Ohn</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("div:contains('John')").css("text-decoration", "underline");

  </script>

</body>

</html>

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jQuery div:contains('John') — official demo (Try It)