HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery .andSelf() — find</title>
  <style>
    .highlight { background: yellow; padding: 4px; }
    .left, .right { width: 45%; float: left; }
    .right { margin-left: 3%; }
  </style>
</head>
<body>
  <div class="left">
    <strong>find("p") only</strong>
    <div class="panel">
      <p>First</p>
      <p>Second</p>
    </div>
  </div>
  <div class="right">
    <strong>find("p").andSelf()</strong>
    <div class="panel">
      <p>First</p>
      <p>Second</p>
    </div>
  </div>
  <script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
  <script>
    $(".left .panel").find("p").addClass("highlight");
    $(".right .panel").find("p").andSelf().addClass("highlight");
  </script>
</body>
</html>

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jQuery .andSelf() — find + andSelf (Try It)