JSFiddle - React, Tailwind, and code Playground

HTML

<div class="slide2">Slide2</div>
<div class="slide">Slide</div>

CSS

.slide2, .slide
{
    display:none;
}

JavaScript

function slideEm()
{
    $(".slide2").toggle(); 
    $(".slide").toggle(); // Make this visible first
    
}

$(function(){
    $('.slide').show();
    window.setInterval(slideEm, 1000);
});