You may expect the following questions for HTML and CSS:
1. HTML events
2. Shadow DOM
3. Cookie, session storage, local storage
4. Lazy loading
5. data- attributes
6. CSS Questions: Position, display, float, media queries, and Box model
7. Semantic HTML
8. Pseudo class and element
9. Web performance - CDN, HTTP2, minification, etc.
10. Critical rendering path
11. block vs inline element
12. Web security - CORS, XSS, etc.
13. Basic HTTP Headers - content-type, etc.
You can check out this blog on HTML interview questions for detailed explanations of these questions.
You can watch this video on HTML Interview Questions and Answers for HTML questions: