JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<span id="myspan"></span>

JavaScript

var span = document.getElementById('myspan');

var int = setInterval(function() {
    if ((span.innerHTML += '.').length == 4) 
        span.innerHTML = '';
    //clearInterval( int ); // at some point, clear the setInterval
}, 100);