JSFiddle - React, Tailwind, and code Playground

HTML

<div id="example">Hover me</div>
<script type="text/javascript">
    (function(){
        var timer;
        var el = document.getElementById('example');


        el.onmousemove = function(){
        clearTimeout(timer);
        timer = setTimeout(function(){
                alert('Popup!');
            }, 1000);
            
        }
    })();
</script>