This is an interesting idea. And like very often things that may seem like counterexamples on the surface are actually open doors to something completely differ

This is an interesting idea. And like very often things that may seem like counterexamples on the surface are actually open doors to something completely different ways of doing things. Like: -Normal (stacked / Z) navigation is still special since it happens always on a full-screen scale. -While you can stack your own UI the way you want, you still have to be able to really navigate to another page or app. What about if you could navigate on widget scale? Like every web widget would have a different URL? Instead of having a single monolithic view we would have more independent views. Or what about if we render external links as regular content? Should <a> and <iframe> be just a single element and just give different CSS render hints. If we can compose final user experience from multiple applications what kind of "higher order applications" we can do and what this means for application development?