document.body.onclick = function(e) {
         e = e || window.event;    var target = e.target || e.srcElement,        style = target.currentStyle || window.getComputedStyle(target, null),        borderLeftWidth = parseInt(style['borderLeftWidth'], 10),        borderTopWidth = parseInt(style['borderTopWidth'], 10),        rect = target.getBoundingClientRect(),        offsetX = e.clientX - borderLeftWidth - rect.left,        offsetY = e.clientY - borderTopWidth - rect.top;    console.log([offsetX, offsetY]);};