HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>upgrade buttons replaceAll</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    .btn-old { display: inline-block; background: #cbd5e1; padding: 8px 14px; margin: 4px; border-radius: 4px; cursor: pointer; }

    .btn-new { background: #6366f1; color: #fff; border: none; padding: 8px 14px; margin: 4px; border-radius: 6px; cursor: pointer; }

    button.upgrade { margin-top: 10px; padding: 10px 16px; background: #059669; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

  </style>

</head>

<body>

  <div class="btn-old">Submit</div>

  <div class="btn-old">Cancel</div>

  <button type="button" class="upgrade">Upgrade buttons</button>

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

  <script>

    $(".upgrade").on("click", function() {

      $(".btn-old").each(function() {

        var label = $(this).text();

        $("<button type='button' class='btn-new'></button>")

          .text(label)

          .replaceAll(this);

      });

    });

  </script>

</body>

</html>

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jQuery .replaceAll() — upgrade buttons (Try It)