This question evaluates React component architecture, frontend state management (including Context and reducer patterns), performance optimization for large lists, and interactive media UI behavior such as single-active playback and sequential "Play All" flow, mapping to the System Design and frontend engineering domain and testing practical implementation with architectural considerations. It is commonly asked to assess a candidate's ability to design maintainable, extensible UI systems that manage shared state and resource-heavy elements while reasoning about trade-offs between rendering performance and feature complexity, requiring both practical coding knowledge and high-level design thinking.
You are asked to design and implement a React video playlist component that:
Assume the input is an array of videos, each with at least: id, title, thumbnailUrl, src.
<video>
elements for offscreen items.
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