Link or embedded playground/repl (i.e. Try It!)

I think this would be nice to have a playground available from the website. This is how I first tried clojurescript few years ago and I wish new comers could do the same.

elm as an "online editor" (not sure if it's linked from the main page) http://elm-lang.org/try
coffescript as a "try button" on the main page http://coffeescript.org/
TypeScript as a "playground" on the main page https://www.typescriptlang.org/play/index.html
Dart as a "Dartpad" example linked on the main page https://dartpad.dartlang.org/b51ea7c04322042b582a

Different terminology but I like the playground one.
They almost all have some examples/template with the Dart ones better than the others from my point of view (a websocket client for example)

I guess klipse would be nice (I'm watching the klipse ClojuTRE video)
Loading example from gist looks straightforward https://github.com/viebel/klipse/blob/master/repl.md

I would be happy to propose a pull request once the ideas, terminology and examples are validated

Start by reviewing the linked Elm, CoffeeScript, TypeScript, Dart and Klipse examples, then inspect the website structure to identify where a playground link or embed could belong. The issue is done only after the terminology, implementation approach, and example templates are validated and an integration scope is agreed.