Can't speak for the OP, but "Takes a bite out of the Apple" implied to me an alternative engine at the first glance.

<snicker>

yeah, "supposed to" is doing a quite a bit of heavy lifting. it has gotten soooo much better than in the past, but yet things still do slightly weird things depending on browser. the closer to the designer you are, the more you notice. by notice, i mean have it pointed out to you.

It's not just about the engine itself, it's about things like supporting extensions. Safari's content blocker API is less powerful than Firefox's on desktop/Android, for example. I don't know how much of that is a technical engine limitation versus an Apple policy decision.

Then this is a click baity title. There are tons of reskinned browsers, how is Vivaldi different form the rest?