HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>insertAfter inner demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 480px; }
    .inner { background: #dbeafe; padding: 8px 10px; margin: 6px 0; border-radius: 4px; }
    button { margin-top: 12px; padding: 10px 16px; background: #059669; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #hint { color: #64748b; font-size: 14px; margin-top: 10px; }
  </style>
</head>
<body>
  <div class="inner">Hello</div>
  <div class="inner">Goodbye</div>
  <button type="button">Insert span after .inner</button>
  <p id="hint">Each .inner gets a Test span as next sibling.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("button").on("click", function() {
      $("<span> Test </span>").insertAfter(".inner");
      $("#hint").text('Inserted "<span> Test </span>" after each .inner element.');
    });
  </script>
</body>
</html>

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jQuery .insertAfter() — HTML after .inner (Try It)