[j0hnik]

<style>
	div{
		width: 100px;
		height: 100px;
		border: 1px solid gray;
	}
</style>
<div></div>
<div></div>
<div></div>
	<script>
document.querySelectorAll('div').forEach(el=> el.onmouseover =e=> ++el.textContent);
	</script>