left: (
                pos.left                                                                // the calculated relative position
                + this.offset.relative.left    * mod                                        // Only for relative positioned nodes: Relative offset from element to offset parent
                + this.offset.parent.left * mod                                            // The offsetParent's offset without borders (offset + border)
                - (this.cssPosition == "fixed" || this.PAGEX_INCLUDES_SCROLL || this.OFFSET_PARENT_NOT_SCROLL_PARENT_X ? 0 : this.scrollLeftParent.scrollLeft()) * mod    // The offsetParent's scroll position, not if the element is fixed