Stackoverflow Response: Determining if a div was clicked on its border

http://stackoverflow.com/questions/16162649/determining-if-a-div-was-clicked-on-its-border/16166232#16166232

HTML

<div class="A">
    This is div
</div>

<div class="B">
    This is div 2
</div>

<div id="log"></div>

CSS

div.A, div.B {
    background-color:yellow; 
    width:50px; 
    height: 50px;
    margin: 20px;
    padding: 10px;
    border-style: solid;
    border-color: red;
}
div.A {
    border-width: 10px 20px 30px 40px;
}
div.B {
    border-width: 50px 60px 70px 80px;
}

JavaScript

var $log = $('#log');
    
    $("div")
        .on('mouseout', function () { $log.empty(); })
        .on('mousemove click', function (event) {               
            $.extend(box, {
                inner: {
                    top: box.offset.top + box.border.top,
                    left: box.offset.left + box.border.left,
                    right: box.offset.left + box.border.left + box.inner.width,
                    bottom: box.offset.top + box.border.top + box.inner.height
                }
            });
        
            $.extend(box, {
                inner: {
                    mouse: {
                        top: event.pageY - box.inner.top,
                        left: event.pageX - box.inner.left,
                        right: event.pageX - box.inner.right,
                        bottom: event.pageY - box.inner.bottom
                    }
                }
            });
            
            $log.html(
                [
                    'Box: ' + boxName,
                    'Mouse: ' + JSON.stringify(box.inner.mouse)
                ].join('<br>')
            );
            
            if (event.type == 'click') {
                if (box.inner.mouse.top > 0 &&
                    box.inner.mouse.left > 0 &&
                    box.inner.mouse.right < 0 &&
                    box.inner.mouse.bottom < 0) {
                    alert('Clicked in yellow area');
                } else {
                    alert('Clicked on border');
                }
            }
        });