JSFiddle - React, Tailwind, and code Playground

HTML

<p id = "p1">This is paragraph 1. </p>
<p id = "p2">
    This is paragraph 2.
    </p>
<p id = "p3">This is paragraph 3. It should contain paragraphs 1 and 2.
    <!-- {{p1}} {{p2}} -->
</p>

JavaScript

$(document).ready(function(){
  $('#p3').html($('#p1').html()+$('#p2').html())
});