JSFiddle - React, Tailwind, and code Playground

HTML

<div id="a">
    a
    <div id="b">
        b
    </div>
</div>

JavaScript

document.getElementById("a").addEventListener("click", function () {
    alert("Hello");
});
document.getElementById("b").addEventListener("click", function (e) {
    alert("Hi!");
    e.stopPropagation();
});