JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mydiv">
    sjdfajkbhjcxcx
</div>

JavaScript

window.onmouseover =  function(){ mouseOver(e)};
document.getElementById("mydiv").onmouseout = function() {mouseOut()};

function mouseOver(e) {
   if (e.nodeName === "DIV"){
        alert("it's a div");
    }    
}

function mouseOut() {
    document.getElementById("mydiv").style.color = "black";
}