// leaking
Nothing below needed a click, a permission prompt or a login. It was collected the moment this page loaded, the same way any website can collect it.
These need your permission, but sites ask all the time and people click "Allow" without thinking. Each button shows what that one click gives away. Nothing leaves this page.
GPS or Wi-Fi positioning, usually accurate to a few metres instead of a city.
Once granted, the exact model of every camera, microphone and speaker becomes visible.
The Local Font Access API (Chromium) lists every font on your machine, a very unique list.