For HTML, are the CSS and JS essential?

Question

In Code playground there are three programmes, HTML, CSS and JS. These seems as they are supplementary to each other. I think with out CSS and JS HTML is incomplete?

Answer 1

Yes because these three together can make a nice code.
Html is structure
Css is presentation
Js is behavior

First you have to learn html then css and then js

Answer 2

Thanks

Answer 3

Not mandatory for small web pages, like which doesn't have connections with database.

Answer 4

Yes

Answer 5

Yes