To track a mouse every x seconds

mousetrack.js

var mouse = { x : 0, y : 0 };
document.addEventListener('mousemove', function (e) {
	mouse.x = e.clientX || e.pageX;
	mouse.y = e.clientY || e.pageY;
})
var track = function () {
	console.log(document.elementFromPoint(mouse.x, mouse.y));
	setTimeout(track, 3000);
}

track();