Can I build 3D interactive websites with a-frame? I mean, are there input controls like in HTML5? Type text in a textbox, upload files control, buttons, show a floating window with some 2d rendered HTML, like a table, etc? And then of course, have these spatially set up.
I am building an app that can help studying for the 2D web. I can imagine that being fully immersed in the study environment, and interact spatially, can help you learn even faster with more focus.
Nope, stuff must be built with WebGL. There are some early widget sets out there like aframe-material.