You know, this is a solved problem. Qt, for example, can easily do it (and has been able to do it for 10+ years, from microcontrollers to phones). And, just say

You know, this is a solved problem. Qt, for example, can easily do it (and has been able to do it for 10+ years, from microcontrollers to phones). And, just saying, QT is damn fast, a necessity if you want to work on microcontrollers of course. And yes, you can do it without royalties, without paying for QT, and in multiple languages (at least C++ and Python work pretty well). (oh, and QT supports 3d, on the web, on android, on ios, and on desktop, even on microcontrollers if needed) And yes, Javascript's advantage has been that it was cross-platform pretty early on. Not particularly fast though, not even decades later. And everybody keeps pointing out the same shortcoming: these frameworks let you share a lot of code, but mostly not the actual "View" (the V in model/view/controller) code, due to screen sizes, whether the UI can be resized, extra functionality (e.g. statusbar/notifications/...) That's why new frameworks come out, because "why can't notifications on Windows work the same as on android?". "Why not just share UI?". Unfortunately, there's very good reasons they cannot work the same ... So a couple years in, these frameworks develop the exact same problems.