The Focus (Focuscript)

**Is your feature request related to a problem? Please describe.** This is a feature request to implement The Focus https://git.xmpp-it.net/sch/Focus The Focus does with XSLT, that which Greasemonkey does with ECMAScript. **Describe the solution you'd like** Adding a userstype manager, similarly to that of Greasemonkey, but of XSLT. **Describe alternatives you've considered** Utilizing the Bash or Python implementations of "focus.sh" or "focus.py", and open the resulted document with Nyxt. **Additional context** Please. Communicate with me over XMPP or Email for further information, examples, and realizations.