<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#div{
position: absolute;
width: 100px;
height: 100px;
background-color: darkred;
left: 100px;
}
</style>
</head>
<body>
<div id="div"></div>
</body>
<script>
var div = document.getElementById('div')
document.onmousemove = function(event){
console.log(event.clientX)
console.log(event.clientY+'Y')
div.style.left = event.clientX+'px'
div.style.top = event.clientY+'px'
}
</script>
</html>