JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>1 Lorem ipsum dolor sit amet, consectetur adipiscing elit.</li>
    <li>2 Lorem ipsum dolor sit amet, consectetur adipiscing elit.</li>
    <li>3 Lorem ipsum dolor sit amet, consectetur adipiscing elit.</li>
    <li>4 Lorem ipsum dolor sit amet, consectetur adipiscing elit.</li>
</ul>

JavaScript

function test() {
var a= $("ul li:first-child");
    a.slideUp("slow", function(){
        $(this).remove();
    });
    var b = a.clone();
    b.appendTo("ul").hide().slideDown();
};
window.setInterval(test, 1000);