Everything should be operable via keyboard alone.
Standard keys:
- Tab: Move focus forward
- Shift+Tab: Move focus backward
- Enter/Space: Activate buttons and links
- Arrow keys: Navigate within components
- Escape: Close modals and menus
Focus indicators: Never remove outline without replacement. Users need to see where focus is.
Tab order: Should match visual order. Don't use positive tabindex values.
Interview tip: Mention keyboard navigation for modals, dropdowns, and custom components.