Which markup Language being used for text formatting ?

I want to know which markup language is being used for text formatting like e.g (the body of the problem statement)?
Is it that Codechef has made its own or it is following any other markup language?

What I know is Mathjax being used for mathematics !! What about the text ?

Please let me know.

This may help (or not :-P)

https://alibabacloud.discuss.codechef.com/questions/134866/how-to-parse-problem-body

Thank you !.

//