JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">

JavaScript

$(document).ajaxStart(function() {
    $(document.body).append("Starting<br />");
}).ajaxStop(function() {
    $(document.body).append("Stopped<br />");
});

$.ajax({ url: 'http://total.invalid.url' });