Portal Interview Questions

React Portals render a component into a DOM node outside the React root. This lets modals, tooltips, and dropdowns escape overflow:hidden and z-index constraints in the parent tree while remaining in the React component tree for event bubbling and context access.

Create a global modal manager with stacking, portal rendering, focus trapping, ESC handling, and dynamic modal types.

Build a global toast/notification system with portal rendering, queueing, auto-dismiss, animations, and accessibility.