JSFiddle - React, Tailwind, and code Playground

HTML

<div id="Foo">Blink</div>

JavaScript

$(document).ready(function() {
    var f = document.getElementById('Foo');
    setInterval(function() {
        f.style.display = (f.style.display == 'none' ? '' : 'none');
    }, 1000); 
    
});