I find language lacking, promise of single language to handle html, css and js is simply not delivered. I kind of imagined something like components where you

I find language lacking, promise of single language to handle html, css and js is simply not delivered. I kind of imagined something like components where you would have html, css and js and you can say login_form = new loginForm(loginProcess) where loginProcess would be callback that would get username and password... or something along those lines. I guess those are html components that someone was writing about...