Regarding the very recent comments following on from: -Can any of you please explain what is wrong with the complete POC solution here: -If the proposed solution is somehow deficient or not fit for purpose please let me know!I believe the permissions/user-visibility conundrums to be the only loose end.Please also note the plethora of use cases detailed by numerous people over the years that can be found here: -I do not understand Marcos' claim that there is little browser interest when Edge and Chrome are waiting on a specification to implement. Firefox already allows tracking of users in the background today.Cheers Richard Maher