Every browser version the fuzzing network has run, and how many vectors behaved differently on it than on the version before. Behaviour is compared within a platform, OS and charset lane, so an OS difference is never mistaken for a version change.
10 recent releases
10 recent releases
10 recent releases
10 recent releases
2 behaviour changes across the releases listed. History keeps the newest 20 versions per browser lane, so older releases are pruned and coverage reflects what the network happened to run.