> "one language only" if you don't count the javascript, html and css.

My hunch is that you strove for making the First Comment considering that the point of this project is exactly what you said it isn't.

https://www.reahl.org/layout, for instance, talks about how styling works.

Taking this further, here's a comment from one of the maintainers on the relevant Google Group:

> Hello.

> We want casual users of Reahl to be shielded from complexities such as client side scripting and CSS.

> HOWEVER, if you are prepared to move to the next level of learning you can build your own Widgets. When you build your own Widget you can do anything you like - using techniques tutorial.pagerbootstraptutorial.pagerbootstrap that you would have used with a traditional framework.

Hopefully this answers your question.