JSFiddle - React, Tailwind, and code Playground

HTML

<p>Ready:</p>

CSS

body{background:#000;color:#fff;font:15px monospace}

JavaScript

var i = 0;
setInterval(function(){
    i++;
    var container = document.getElementsByTagName('body')[0];
    var elm = document.createElement('p');
    var text = document.createTextNode('Downloading record '+i+'...')
    elm.appendChild(text);
    container.appendChild(elm);
    scrollTo(0, document.body.clientHeight);
}, 500);