Components Interview Questions

Understand where a custom property resolves, why inheritance makes subtree overrides work, and the patterns for scoping and exposing component tokens.

Learn how container queries let a component respond to its own available width, why containment must be opted into, and where media queries still belong.

Set fallback values for optional props using destructuring defaults in functional components and understand when to use defaultProps.

Understand the anatomy of a React function component, how JSX compiles, and the rules that make a valid component.

Understand what JSX compiles to, why it exists, and the rules that govern how you write it correctly.