Minecraft: Show more information for items?

Do you know what the setting in Minecraft means / where to find it, which allows you to see more information about items (for example, ID name), when you look over the items in your inventory, so do not click or to press a button? Or do you need a mod for it?

F3+ H

Does that work in the 1.8?

Yes, in all versions.

Ok, thanks, it works now. I had tried it with a little h

Whether big or not does not really matter. You may not have pressed F3 and H at the same time

Actually, I had already pressed it at the same time, but now it works