FLoC has a well defined API like (all) standards: https://wicg.github.io/floc/ https://wicg.github.io/floc/ There's no reason why the website would not be reli

FLoC has a well defined API like (all) standards: https://wicg.github.io/floc/ https://wicg.github.io/floc/ There's no reason why the website would not be reliable at detecting whether FLoC is enabled on your browser. You can also used https://floc.glitch.me/ https://floc.glitch.me/ which was linked in one of the blog posts from google.