(html) Input field in mathjax rendered equation ?

Created by: jhoobergs

I'm currently trying to convert a piece of code (that I didn't write) from mathjax 2.7 tot mathjax 3.

At https://github.com/XimeraProject/server/blob/master/public/javascripts/main.js#L317 you will find code that (maybe in a hacky way?) makes it possible to add an \answer command which places an input field at that location.

For example: \frac {4}{(m+1)!}-\frac {1}{m!}=\frac {\answer {3-m}}{(m+1)!} gives

It uses a lot of mathjax 2 specific things it seems, so I can't find how to port this to mathjax 3. I tried reading the mathjax 3 api documentation, but the documentation doesn't seem to be done yet.

My question actually is: 'Is it possible to easily let a custom tex command add an html input tag inside mathjax ? Or is it somehow possible to add an input field ?'