Viewport detection after Zoomooz scale

[SimeriaIonut]

After zoom, I want to be able to take the coordinates left and top of my element relative to the viewport, however I get wrong values because my "body" is scaled (zoomed).

I tried using getBoundingClientRect(), however it doesn't give me values relative to the viewport, but to the document.

How can I get the top and left value of an element relative to the viewport after zooming in with zoomooz?