The idea is that by knowing HTML and CSS you know how to use any framework. Since they are the base technologies that every front-end developer should know, a f

The idea is that by knowing HTML and CSS you know how to use any framework. Since they are the base technologies that every front-end developer should know, a frameworks should build upon the principles of these. This doesn't hold true for React, since they just decided to do their own thing, but for frameworks such as Svelte this is a core principle they try to stick to.