Get the position of a div/span tag

You can call the method getBoundingClientRect() on a reference to the element. Then you can examine the top, left, right and/or bottom properties…

var offsets = document.getElementById('11a').getBoundingClientRect();
var top = offsets.top;
var left = offsets.left;

If using jQuery, you can use the more succinct code…

var offsets = $('#11a').offset();
var top = offsets.top;
var left = offsets.left;