Thread:Talk:ResourceLoader/Version 2 Design Specification/Cleaning up gadgets, gadget manager/reply (3)

I know what you meant. Building a gadget that validates code on the fly or enforces or recommends a certain coding style is, however, fairly similar to a syntax highlighting custom editor interface. Incorporating something like this is significant to the user, but is technically very similar.

For example JSBin automatically validates through JSLint when "Real-time preview" is enabled (it's in the bottom left corner).