Pioneer this in the JS/client-side rendering world of course. Mithril is about 10 years old, so in the same ballpark. Web applications aren't just HTML though,

Pioneer this in the JS/client-side rendering world of course. Mithril is about 10 years old, so in the same ballpark. Web applications aren't just HTML though, that's why code might be a more appropriate format. You can argue that designers need better tools to edit structured markup in other formats, but that doesn't entail that HTML should be the default format. For instance, something like repl.it for mithril or similar that immediately renders the output so you can see the results would be useful.