OK thanks. If you couldn’t work it out, my chances are minimal to none.
BTW was this issue below ever fixed in Tor Browser? If not, it’s a major oversight (and we should also document it).
getClientRects allows to get the exact pixel position and size of the box of a given DOM element. Depending on the resolution, font configuration and lots of other factors, the results of getClientRects are different, allowing for a very quick and easy fingerprinting vector, even better than the canvas fingerprinting that is fixed.