JSFiddle - React, Tailwind, and code Playground

HTML

<div class="sectionA"><p>sfadfafdafdafdaf</p></div>

CSS

.sectionA { background-color: cyan; }

JavaScript

var $s = $(".sectionA").empty();
var chars = $s.text().length;

$('<p>').text(chars + ' characters in the div.')
	.appendTo('body');