storing mouse position as variable and comparing with values to fire events

I'm in a position where I can't simply use a hover event, but I need to trigger mouseover and mouseout when the mouse is inside the area of a given element and when it leaves that area. It can be javascript, or jquery, or a mix. I haven't successfully been able to store the mouse positions as variables or figure out a way to tell when the mouse leaves the given area. My questions are each represented by '????' in the code.

function targetMouse() {
    var box = document.getElementById('CleanBox'),
        top = box.offsetTop,
        left = box.offsetLeft,
        right = left + box.offsetWidth,
        bottom = top + box.offsetHeight,
        mouseX = ????;
        mouseY = ????;

    if (left < mouseX > right && top < mouseY > bottom) {
    else if (????) {

thanks for the help!


Something like this?

.box {

    position: absolute;
    top: 30%;
    left: 30%;
    border:2px solid;

<div id="popup">Mouse is on box</div>
<div id="box" class="box"></div>

var box = document.getElementById("box");
var top = box.offsetTop;
var left = box.offsetLeft;
var right = left + box.offsetWidth;
var bottom = top + box.offsetHeight;
var hoverState = false;
var popup = document.getElementById("popup");

popup.hidden = true;

function hoverCheck(evt) {
    var x = evt.clientX;
    var y = evt.clientY;

    if (x >= left && x <= right && y >= top && y <= bottom) {
        if (hoverState === false) {
            hoverState = true;
    } else {
        if (hoverState === true) {
            hoverState = false;

    popup.hidden = !hoverState;

document.addEventListener("mousemove", hoverCheck, false);

on jsfiddle

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