alt Hacker NewsIVD works, theoretically and practically (recent versions of OpenType have an explicit support for them). It's not their fault that Japanese vendors have been not very quick to adopt them.
IVD works, theoretically and practically (recent versions of OpenType have an explicit support for them). It's not their fault that Japanese vendors have been not very quick to adopt them.
If a Japanese and Taiwanese person type things with their keyboards and end up with the same bytes for different logical characters then no things do not work practically for any practical definition of "practically".