JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<span id="textarea_feedback">0</span>
<textarea id="textarea"></textarea>

JavaScript

$(function(){
	var text_max = 0;
  $('#textarea_feedback').html(text_max);
  $("#textarea").keyup(function(){
      //var text_remaining = text_max - text_length;
     $('#textarea_feedback').html($('#textarea').val().length);
  });
});