Ragebait page. I left after seeing Contact Picker API listed. Contact Picker API is, per the MDN link in the OP, marked as "This is an experimental technology.

Ragebait page. I left after seeing Contact Picker API listed. Contact Picker API is, per the MDN link in the OP, marked as "This is an experimental technology." It is "not Baseline because it does not work in some of the most widely-used browsers."