Wasm comes to mind for a new browser arch because in theory it could be a userland replacement for traditional platform features like the UI. You could have a w

Wasm comes to mind for a new browser arch because in theory it could be a userland replacement for traditional platform features like the UI. You could have a wasm module for HTML, for instance, which could be chosen for legacy sites, but replaced for a different approach (VR UI, cloud service which doesnt need one, etc). This would help minimize the browser core and make the execution environments swappable and reusable across browser cores. That said, I agree that performance may be a dealbreaker on that idea. HTML/DOM is also tightly integrated into a lot of browser behaviors, so I have no idea whether it's feasible to extract it into a swappable module. EDIT: It's still an idea that gets me pretty excited to try.