JSFiddle - React, Tailwind, and code Playground

HTML

<div class="betweenable">some content</div>
<div class="betweenable">other content</div>
<div class="betweenable">yet another</div>

JavaScript

$('.betweenable').click(function(){
   var newmarkup = '<div class="betweenable">new content</div>';
   $(this).before(newmarkup);
});