The net reaction is 1,2-elimination, hence the name Hofmann Elimination.
Hofmann elimination occurs in three stages.
Stage 3 is a 1,2-elimination via E1cB mechanism.
Hofmann elimination is regioselective. Since the 1,2-elimination in Stage 3 occurs via E1cB mechanism, Hofmann rule is used to predict the major product. eg:
see also quaternary ammonium salt