Well, yes, but it comes with all the overhead of being a (partly) flawed language. Having a bytecode that allows, for instance, optional static and dynamic types would be much more direct than relying on type inference or separate native APIs (as are being introduced). Of course we have javascript now, so pragmatically languages should be compiled to it if we want them, but if there were to be an additional web bytecode, there would be many areas for improvement in terms of performance and safety.