It is just an API set you target. You should see it as NodeJS vs Web Browser. They both support a common API set defined in ECMAScript 6 (for instance) which co

It is just an API set you target. You should see it as NodeJS vs Web Browser. They both support a common API set defined in ECMAScript 6 (for instance) which contains Date, Intl.DateFormat, Symbol.iterator, etc. Note that executables cannot be compiled to .NET Standard, because they are self-bootstrapping so they must target one or the other (or both).