Like this.
function printMousePos(event) {
document.body.textContent =
"clientX: " + event.clientX +
" - clientY: " + event.clientY;
}
document.addEventListener("click", printMousePos);
MouseEvent.clientX Read only
The X coordinate of the mouse pointer in local (DOM content) coordinates.MouseEvent.clientY Read only
The Y coordinate of the mouse pointer in local (DOM content) coordinates.