If these proposed browsers don’t ship with a JS engine [1], do you also hope to have more than one internet around?
[1] Such as V8, Chakra, JavaScriptCore, SpiderMonkey, Rhino, Nashorn, there is a variety to choose from, also experimental models such as Tamarin, they are almost certainly not the critical blocker for developing a browser.
[1] Such as V8, Chakra, JavaScriptCore, SpiderMonkey, Rhino, Nashorn, there is a variety to choose from, also experimental models such as Tamarin, they are almost certainly not the critical blocker for developing a browser.