xxxxxxxxxx
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Prueba</title>
</head>
<body>
<p id="corx">coordenada x=</p>
<p id="cory">coordenada y=</p>
<script src="funciones.js"></script>
</body>
</html>
let ref = document.getElementsByTagName('html')
ref[0].addEventListener('mousemove', (e) => {
document.getElementById('corx').innerText = 'coordenada x=' + e.clientX
document.getElementById('cory').innerText = 'coordenada y=' + e.clientY
})