JSFiddle - React, Tailwind, and code Playground

HTML

<div class="second select visible">
    <div class="item x">text 1</div>
    <div class="item x">text 2</div>
    <div class="item x">text 2</div>
</div>

JavaScript

console.log(document.querySelectorAll(".select.visible .item.x").length)