JSFiddle - React, Tailwind, and code Playground

by Mawel Don

HTML

<div id="body"></div>

JavaScript

function test(){
        document.getElementById('body').append('test')
            alert('test')
        }

        function ready(fn){ //Understand what is going on between fn() and fn
            if (document.attachEvent ? document.readyState === "complete" : document.readyState !== "loading"){
                fn; //originaly fn()
            } else {
                document.addEventListener('DOMContentLoaded', fn);
            }
        }

        ready(test)