jQuery event normalize offsets

example.js

$('.area').on('mousemove', function (e) {
  $.event.normalizeOffsets(e);
  console.log(e.normalizedOffsetX, e.normalizedOffsetY);
});

jquery.event.normalizeOffsets.js

$.event.normalizeOffsets = function (e) {
  var offset = $(e.target).offset();
  e.normalizedOffsetX = e.pageX - offset.left;
  e.normalizedOffsetY = e.pageY - offset.top;
  return e;
};