When a mouse event is triggered, the pageY mouse event property is used to get the vertical coordinate of the mouse pointer. The coordinate is relative to the screen.
Example
You can try to run the following code to learn how to implement pageY Mouse event in JavaScript.
<!DOCTYPE html>
<html>
<body>
<p onclick="coordsFunc(event)">Click here to get the x (horizontal) and y (vertical) coordinates of the mouse pointer.</p>
<script>
function coordsFunc(event) {
var x_coord = event.pageX;
var y_coord = event.pageY;
var xycoords = "X coords= " + x_coord + ", Y coords= " + y_coord;
document.write(xycoords);
}
</script>
</body>
</html>