Not to make it sound any less impressive (because it truly is an amazing effort) but it's basically first place there simply because the criteria excludes every other like engine better and there is no remaining option that's worse. Well technically (the now deprecated) KHTML is missing many of the things now supported but that spawned the "WebKit Family" so I don't think that counts (and it supports other things Serenity's doesn't). Well Lynx might actually be behind in compliance... but it's not exactly aiming for the same goalpost.
I see your point. I guess I was trying to make the point (that perhaps everyone on HN is already aware of) that there really is an incredibly limited number of active browser projects even marginally capable of being used for the modern web so any new one deserves huge support.
