JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
<script>
  
  jQuery.fn.myPlugin = function () {
    return this.append('<p>My Plugin</p>');
  };
  
  var myJQuery = jQuery;

  jQuery(function () {
    myJQuery('body').myPlugin();
  });

</script>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>