if you were going to use HTML in the game, you'd have to use or make one that works with SDL. (making a fully complient HTML parser from scratch can be tricky, and even more so to decide how the information would be displayed in the window)

I think what he meant by saying it wont lag is because you wont need internet to access the wiki because the wiki is saved inside the game. Also the wiki gets updated very often that will make the game update very often.

greymatter:

We just need a detailed help of elements in the game. A question mark near the description of an element that pops out a detailed help of an element's properties should be created in-game. So we don't need to have an internet connection but we can still get a detailed description of that element.
Shouldn't be too hard.

 just as long as it's not too easy to activate on accident.