JSFiddle - React, Tailwind, and code Playground

HTML

<button>1</button>
<button>2</button>
<button>3</button>
<button>4</button>
<button>5</button>

JavaScript

document.querySelectorAll("button").forEach(el => el.addEventListener("mouseover", e => alert("Вы навели на кнопку: "+e.target.textContent)))