Technically there is WebKit which powers safari and gnome web. The good thing is that iOS app store basically forces you to use WebKit for websites so it won't die. Bad news is that Apple does not really like the new web standards and in the name of privacy simply doesn't implement standards that can give web apps an edge over native iOS apps. And Gnome Web currently has licencing issues with webrtc and media support is poor(gstreamer). Also Chromium is a WebKit fork pre 2013 so it shares several quirks with Safari(prob some of the old standards) which is a prob in itself