We use feature detection and graceful degradation, so the retro way of manually typing emails still works, but if we present the contact picker button on the UI, clicking on it will open your device contacts app and allow you to pick one contact.
We filter only contacts with emails registered, and limit the selection to only one contact at time so the workflow is the same.
If you want to test it right now, it is live on latest Discourse, and naturally here on Meta. But until Chrome 80 releases you need to use their Dev or Canary channel.
Is the API not supported in Windows? I have all of my contacts in the People app. It would be very convenient if Discourse could access contacts from that app for invitation purposes. Could I possibly use Google Contacts as a workaround?
Also, is the API included in all Chromium browsers? I’m wondering if it would work in Microsoft Edge, Opera, etc. On top of that, is the API included in Firefox and Safari?