they measure for the first down like every play that ends within 3 yards of the first down marker. shits annoying cuz you cant skip it and usually it's pretty damn obviously whether or not you got the first. Same with touchdowns, the ref always talk about if he got in. I walked in the endzone with my fullback and got tackled like halfway in the endzone, the refs huddle and are like, yeah he scored. No fuckin shit!!