What is HTML?
What is a browser? How is it different from node.js?
What is semantic HTML? How do we achieve it?
What is CSS? What problems does it solve?
What are the three ways of inserting CSS into a web page?
What is the difference between ids and classes? When to use what?
Which are the types of selectors you can use?
What is the selector priority hierarchy?
What is the difference between block elements and inline elements?
What is the grid layout?