JSFiddle - React, Tailwind, and code Playground

HTML

<div id="row1">
    <div class="type_3"></div>
    <div class="type_1"></div>
    <div class="type_2"></div>
    <div class="type_2"></div>
</div>

JavaScript

var children = document.getElementById("row1").children;
for (var i = 0; i < children.length; ++i) {
    alert(children[i].className);
}