[hajile]

That depends on the language you choose.

If we went to a scheme dialect as originally intended, we could have just ONE language for all the things.

Legacy JS? Just compile it into Scheme and run it.

HTML? Use S-expressions and support legacy HTML syntax by compiling it into them. Now you get all the power people want from template languages, but baked right into main language itself.

CSS? No more weirdness like adding sin() or calc() to make up for shortcomings. Once again, you get the power of the full Scheme language right there.