coords.html

<html>
<body>

<p id="demo"></p>
<p id="dem"></p>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
let screenLog = document.querySelector('#demo');
document.addEventListener('mousemove', logKey);

function logKey(e) {
  screenLog.innerText = `
 ${e.screenX}, ${e.screenY}
 ${e.clientX}, ${e.clientY}`;
}
</script>

</body>
</html>