After building a full stack app (with limited users), what does the handoff look like? You leave a comment saying what a variable does? Also, does a Css/html

After building a full stack app (with limited users), what does the handoff look like? You leave a comment saying what a variable does? Also, does a Css/html dev have less prestige than a front end logic dev? I'm admittedly an outsider, engineer by degree, but casual programmer of 10 years. I can do html/css for fun, logic takes music and caffeine.