Annoyingly? Ironically? The best technical implementation of this law would be to make it possible for the "device owner" to tell the OS to set a flag that the user was under age. Never send the age, never send anything else. Just have a global variable indicating that the user is under age that can be accessed by the browser.
Now what would happen after that?
First oses would have to implement the above in a way that could not be bypassed, pretty much impossible if the child has access to the device.
Then you would need to require that websites honor that token or any similar token no matter how it was implemented ... https MITM etc. good luck with that.
Finally once all the implementation and enforcement hurdles are complete every website out there would immediately know that the user browsing was a child and all the trackers and ad networks on the web would immediately start targeting those users because children are marks.
Now you need even more laws and regulations to protect the children from being targeted by advertising companies, and good luck with enforcing that.
To me, the Hyperion Cantos present a vision of the future that is incredibly hopeful. The path along the way may at times be bleak, and I find the handling of the TechnoCore to reveal echos of the great chain in a work that otherwise seems to totally reject it. Despite those and a few other shortcomings the Cantos are essential guides for charting our way toward a distant future that is filled with warmth, love, and compassion rather than the cold empty void of hate. To receive such a vision is a rare gift. Thank you Dan. Choose again.
To extend the though there, the main question is not if, not when, but how long it will take. Do you bet on 90 years, 90 months, 90 days, 90 hours? Even if the change happens over 90 months (about 7 years) is that enough time to rebuild major shipping ports, forget resettling a substantial portion of the human population.
We'll I'm used to not being most people, but I'd much rather be able to produce a single identical binary for my users that works everywhere than the platform specific nonsense I have to go through right now. Having to maintain different special build processes for different platforms is a stupid waste of time.
Frankly this is how it always should have worked except for the monopolistic behavior of various platforms in the past.
However bad people think X11 is, the engineering decision (or more likely lack of any intentional design decisions beyond the initial extremely narrow use cases?) to "replace" a huge portion of its functionality with windowing toolkits is a disaster for open source. I have written about this before, but the amount of waste and rework that it induces is completely unsustainable. If you want to see another generation wasted in the bazaar then stick with wayland. Wayland is very good at the use case it was developed to serve, which is fast booting systems for automobile backup cameras. Everything beyond that is at best an afterthought. Forcing dbus on everyone to replace xlib is like chopping off your legs because you heard that you can run faster with the new carbon fiber prosthetics -- it will work fine on a track, but the second you try to go hiking off the trail with boulders you will fall and break your skull.
I use a swap file these days because in the 4 years since I purchased my computers I went from never hitting 32gigs of memory used at the same time, to hitting it once a week. The worst offenders are browsers and the JVM. The swap file saves me from those 20 seconds of distraction when running a variable memory workload that suddenly jumps over the limit and hardlocks the computer for hours on end. If I was doing something important I will wait for OOM killer to maybe reap the evil children, but otherwise I just power cycle the system and add a note to put the swap file in fstab.
Now what would happen after that?
First oses would have to implement the above in a way that could not be bypassed, pretty much impossible if the child has access to the device.
Then you would need to require that websites honor that token or any similar token no matter how it was implemented ... https MITM etc. good luck with that.
Finally once all the implementation and enforcement hurdles are complete every website out there would immediately know that the user browsing was a child and all the trackers and ad networks on the web would immediately start targeting those users because children are marks.
Now you need even more laws and regulations to protect the children from being targeted by advertising companies, and good luck with enforcing that.