I'm afraid it's already too late to make suggestions, but I would be really excited if Dart supported facilities to make unit testing an integral part of the language, taking into consideration the interaction with the DOM. This is something that would really help IMHO.
> I'm afraid it's already too late to make suggestions,
Which was precisely the point of developing things this way. They don't want anyone's suggestions; they want to force the thing that benefits _them_ the most on everyone else.
