HTTPS and Geolocation with web browsers

I’ve starting coding apps to get a javascript geolocation refresher. Switching between OSX and W10 was quite a pain because:

1. Safari does not support geolocation over HTTP (no idea why http://localhost/ is considered an issue with Safari).
2. W10 Edge supports geolocation over HTTP.

After some experimenting, I discovered Chrome and Brave both support geolocation over HTTP on OSX. Chrome definitely was doing WiFi triangulation because it could return my exact lat/lng whereas Brave was returning the midtown lat/lng coordinates.