How to create a platform like freecodecamp?

I have a question wondering how freecodecamp put together the lesson page where you can write your code, validate them and display the result.

I can write this all in raw HTML/CSS/JS. But it will be a HUGE process.
Did freecodecamp perhaps use some type of library? :smiley:

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I’m not big on the details, but all the details you ever could want is actually on github, as FCC is open source:

I’ll leave the “overall description of the platform” to someone who actually works on the curriculum tho haha :smiley:

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Thanks for the reply guys. :smiley:
I guess I have to build it from scratch as well. LOL