What are the certain templating languages?

In the overview page of the documentation it says that

…however only HTML, and certain templating languages can be visually edited.

I can’t find out what those languages are.

I understand it’s not jsx, but maybe it’s something I can transition to.

Hi @jtheisen,
I think it is referring to PHP, ASP, and ERB.
You can use PUG in the code insert box.