When the mouse event is triggered, use the clientY mouse event property to obtain the vertical coordinate of the mouse pointer. This is based on the current window.
You can try running the following code to learn how to implement clientYmouse events in JavaScript.
<!DOCTYPE html>
<html>
<body>
<p onclick = "coordsFunc(event)">Click here to get the x (horizontal) and y (vertical) coordinates (according to current window) of the mouse pointer.</p>
<script>
function coordsFunc(event) {
var x_coord = event.clientX;
var y_coord = event.clientY;
var xycoords = "X coords= " + x_coord + ", Y coords = " + y_coord;
document.write(xycoords);
}
</script>
</body>
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