JSFiddle - React, Tailwind, and code Playground

HTML

<div class="area"></div>

CSS

.area {
    width:50px;
    height:50px;
    background-color: #aaa;
}

JavaScript

$('.area').on({
  'mouseenter': function(){ alert('mouse entered!') },
  'mouseleave': function(){ alert('mouse left!') }
});