1. What BOM? 2. What are Web and Service Workers? 3. Some CSS puzzles to solve in flexbox? 4. Difference b/w async and differ? 5. What is event propagation 6. What is the difference between stopPropagation and stopImmidatePropagation? 7. What is the difference b/w 'div' and 'section'? 8. What are pseudo-classes and pseudo-elements? 9. What is the difference b/w React.Component and React.PureComponent? 10. What is the difference b/w 'for..in' and 'for..of' loops?
Sigiloso
As you can see these are very basic fundamental questions. But I think the interviewer was probably expecting a concise textbook answer, from the question source he probably looked at.