JSFiddle - React, Tailwind, and code Playground

by Lucas Guima

HTML

<div id="camada">
    <p>Paragraph</p>
</div>
<span id="y">0</span>

CSS

#camada {
    border:solid 1px #F00;
    position:absolute;
    top:10px;
    width:500px;
    height:200px;
    left:50px;
}
#camada p {
    border:solid 1px #090;
    position:absolute;
    top:5px;
    left:100px
}
#y {
    color:#009;
}

JavaScript

var doc = document.getElementById('camada');
var y = document.getElementById('y');

doc.onmousemove = function(evt) {
    y.textContent = evt.clientY;
};