JSFiddle - React, Tailwind, and code Playground

by redler

HTML

<div id="container">
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>
    <div>Hello</div>   
</div>

CSS

div.special { padding: 3px; border: 2px solid blue; }

div.specialer { color: red; }

JavaScript

$('#container').children('div').filter(function(i) {
    return !(i % 5);
}).addClass('special');

$('#container').children('div:nth-child(3n+1)').addClass('specialer');