JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo">
    <div>
        <span></span>
    </div>
    <div>
        <span></span>
    </div>
</div>

JavaScript

var AJAX = function(url,data,callback,silent,loader) {
    var a,
        attempt = 0,
        rsc = function() {
            if( a.readyState == 4) {
                if( a.status != 200) {
                    if( a.status > 999) { // IE sometimes throws 12152
                        attempt++;
                        if( attempt < 5)
                            send();
                        else if( !silent) {
                            console.log("HTTP Error "+a.status+" "+a.statusText+"<br />Failed to access "+url);
                        }
                    }
                    else if(!silent) {
                        console.log("HTTP Error "+a.status+" "+a.statusText+"\nFailed to access "+url);
                    }
                }
                else {
                    callback(JSON.parse(a.responseText));
                }
            }
        },
        to = function() {
            //a.abort(); /* avoid re-aborting */
            attempt++;
            if( !silent)
                console.log("Request Timeout\nFailed to access "+url);
            if( attempt < 5)
                send();
        };
    data = JSON.stringify(data);
    var send = function() {
        if( loader && attempt != 0) {
            loader.children[0].firstChild.nodeValue = "Error... retrying...";
            loader.children[1].firstChild.nodeValue = "Attempt "+(attempt+1)+" of 5";
        }
        a = new XMLHttpRequest();
        a.open("POST",/*"/ajax/"+*/url,true); /* slight edit here for JSFiddle */
        a.onreadystatechange = rsc;
        //a.timeout = 5000;
        setTimeout(function () {  /* vs. a.timeout */
            if (a.readyState < 4) {
                a.abort();
            }
        }, 5000);
        a.onabort = to;           /* vs. a.ontimeout */
        a.setRequestHeader("Content-Type","application/json");
        a.send(data);
        console.log('HTTP Requesting: %s (attempt %d)', url, attempt + 1);
    };
    send();
};

AJAX(
   ...