div element position in screen
function offset(el) { var rect = el.getBoundingClientRect(), scrollLeft = window.pageXOffset || document.documentElement.scrollLeft, scrollTop = window.pageYOffset || document.documentElement.scrollTop; return { top: rect.top + scrollTop, left: rect.left + scrollLeft }}
// example usevar div = document.querySelector('div');var divOffset = offset(div);console.log(divOffset.left, divOffset.top);