Comment by onion2k
The advantage of having a common API across thousands of web apps shouldn't be a point of discussion.
We have one. It's called "the browser". The discussion is whether or not we need a higher level API than that. If we do, maybe that should also be a part of the browser's API.
It would be easier if "the browser" is just one target.
As it is, there multiple browsers supporting different levels of features.
That's the whole reason why frameworks are made in the first place dating back to jQuery.