41 points
No, not Safari. While it’s technically true that Safari’s WebKit engine isn’t based on Chromium’s Blink engine, that’s only because the genetic relationship goes in the other direction: Blink was initially forked from WebKit (which was itself forked from KHTML, by the way).
Point is, Mozilla’s Gecko is the only major browser engine that’s fully unrelated to Blink.
2 points