IMO LLM won't replace developers, at least not in the following 10 years or so. Even if they're having involvement in development, they'll act as assistance too

IMO LLM won't replace developers, at least not in the following 10 years or so. Even if they're having involvement in development, they'll act as assistance tools for (senior) developers. If someone can surpass the junior title and become senior, they'll be fine. And answering your question then yes, all javascript html and css are fundamental for web interface.