Where to see Editor or tool have [Code] tag inside it to enter code??

Question

Hello everybody!
I see this in some website and i do not know how to create or where to see(get) that Editor(I guess). Anyone know the article guide it or code please help me know.I think this was created by Editor(little silly).And this is link that i see it:http://www.cssjockey.com/web-development/tips-tricks/an-easy-way-to-create-light-box-with-jquery-css  and picture of it: