JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li>blah blah</li>
  <li>blah blah blahblah blah blahblah blah blahblah blah blahblah blah blahblah blah blah</li>
</ul>

JavaScript

var div = '<div class="shadow-hide">Test</div>';

$("ul li").append(function(index, html) {
    return html + ($(div).height($(this).height()).html());
});