To do list with js disabled in the browser & no database

Pretty much what the title describes. I need to build a todo app for a job interview, but js must be disabled in the browser, and not using a database.

Any js must be done on the server side.
I have a beginner grasp on node/express and know how to serve html files, but I’m not sure how to go about updating the html files with user input without js Dom manipulation. What would be a modern approach to this problem?