JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://placehold.it/350x150"></img>
<img src="http://placehold.it/350x150"></img>
<img src="http://placehold.it/350x150"></img>
<img src="http://placehold.it/350x150"></img>
<img src="http://placehold.it/350x150"></img>
<img src="http://placehold.it/350x150"></img>

CSS

img {
    display: none;
}

JavaScript

var imgs = document.getElementsByTagName('img');
var interval = 3000;
for (var i = 0; i < imgs.length; i++) {
    (function (index, time) {
        setTimeout(function() {
            imgs[index].style.display = 'block';
        }, time);
    } (i, interval));
    interval = interval + 3000;
}