WPT details: https://github.com/tc39/test262/issues/2997 https://github.com/tc39/test262/search?q=Intl.DisplayNames-v2+path%3Atest%2Fintl402%2FDisplayNames&type=
Extend the Intl.DisplayNames API to include "calendar" and "dateTimeField" names and add "languageDisplay" option. see https://github.com/tc39/intl-displaynames-v2 for the proposal The proposal advanced to Stage 3 on 2021-05-25 Spec: https://tc39.es/intl-displaynames-v2/