html code in alert or Modal

 https://jquerymodal.com/

index.html

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>

<!-- jQuery Modal -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.js"></script>

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.css" />

<!-- Modal HTML embedded directly into document -->

<div id="ex1" class="modal">

  <p>Thanks for clicking. That felt good.</p>

  <a href="#" rel="modal:close">Close</a>

</div>

<!-- Link to open the modal -->

<p><a href="#ex1" rel="modal:open">Open Modal</a></p>

Contoh :

save with  index file name and type this program code

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>

<!-- jQuery Modal -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.js"></script>

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-modal/0.9.1/jquery.modal.min.css" />

<!-- Modal HTML embedded directly into document -->

<div id="ex1" class="modal">

  <p>Thanks for clicking. That felt good.</p>

  <a href="#" rel="modal:close">Close</a>

</div>

<!-- Link to open the modal -->

<p><a href="#ex1" rel="modal:open">Open Modal</a></p>