Support compile-time checking that HTML/JSON/CSS/etc is well-formed

[DemiMarie]

This is a feature request to support checking (at template compile time) that the HTML/JSON/CSS/etc to be produced is well-formed.

[Keats]

How would that work? At compile time you have lots of inheritance, conditions, macro uses, filters and no value to see how it will look rendered. And tera is not even sure what kind of file you are writing as you can put whatever extension you want.

[Keats]

I don't think it's achievable so closing it, if you can come with a proposal I'll be happy to take a PR for it though