The browser as an implementation of the standard is not differentiable. But a universal app engine with sandboxing untrusted apps, high performance, and platfor

The browser as an implementation of the standard is not differentiable. But a universal app engine with sandboxing untrusted apps, high performance, and platform neutrality that may or may not retain a DOM or render HTML is very browser-like and under explored. On the other hand, I don't know if a slightly more customizable browser is something that's really worth building from scratch.