Longpress on macOS

By pure coincidence I manage to find a to me previously unknown function in macOS 10.14. For some characters you can actually “longpress” (holding down the key on your keyboard a little while longer than usual) and just like on your cellphone get a little popup bubble with special characters and other related special symbols and whatnot related to the key you are pressing.

The effect of some “longpresses”

This is system wide and a really smooth way of inserting special characters which are not on your keyboard. I am a bit surprised that this has not been marketed better since today is the first time I’ve ever seen this feature or even heard about it.