"Format Code" feature seems inconsistently supported

Describe your feature request

I want to be able to auto-format my code (ideally done automatically for me on-save) for every single file in any language in every Repl that I have.

What problem(s) would this feature solve?

I just find it very weird that this feature doesn’t exist already. It seems to exist for some files in some Repls, but not all? I guess this is my question - under what conditions would a person who is using Repl.it (since they don’t like needless setup and likes to focus only on essential complexity) not want auto-format to work automatically?

Explain what you were trying to do when you came across the problem leading to this feature request

Just trying to write some HTML