It has. It’s been implemented several times and seen limited adoption. ExtJS, React Native Web, and jQueryUI Mobile all “solved” this problem. Even Twitter Boo

It has. It’s been implemented several times and seen limited adoption. ExtJS, React Native Web, and jQueryUI Mobile all “solved” this problem. Even Twitter Bootstrap could be considered a solution. Why hasn’t one of these caught on and replaced bespoke apps? These frameworks are a lot to learn, difficult to optimize for narrow use cases, bloated, sometimes proprietary or inconveniently licensed, and often hard to maintain as browser capabilities evolve.