What language was used to build Codecademy?

I mean what programming language is used to build the front and back end of this website?PHP?HTML?

html,css and js for front-end (obviously, there aren’t any other choices). ACE (a web integrated IDE) was used for the exercise. The backend is ruby on rails so far i know, and i guess some php for the php course.

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hello my name usef , admin the http://www.ar1tec.com and http://dalil.ar1tec.com but i don t know how i did integrated IDE in my web??? i need your helps plz

with a little googling you should have found there website which contains instructions on how to embed the IDE.