JSFiddle - React, Tailwind, and code Playground

HTML

<div id="myDiv"></div><br/>
  <button id="empty">Check if div empty</button>
  <button id="append">Append to div</button>

JavaScript

$(function() {
    $("#empty").click(function() {
      alert($('#myDiv').is(':empty'));
    });

    $("#append").click(function() {
      $('#myDiv').append('<span>Appended!</span>');
    });
});