JSFiddle - React, Tailwind, and code Playground

JavaScript

var x;

function FetchBox() {alert("Worked");}
                     
function A(m,n) { 
    x = new XMLHttpRequest(); 
    x.open("GET", m, true);
    x.onreadystatechange=
        if(x.readyState==4){
        n(); 
        x.send();
    };
}

A("http://jsfiddle/echo/xml/", FetchBox);