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Modern Browser APIs

JavaScript / 8 questions

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1 Explain the Streams API (`ReadableStream`/`WritableStream`/`TransformStream`) and a use case for processing large downloads incrementally. Hard
2 How do you establish and maintain a WebSocket connection, including handling reconnection with backoff? Medium
3 At a conceptual level, explain how WebRTC peer connections are established via signaling and ICE candidates. Hard
4 What problem does `SharedArrayBuffer` + `Atomics` solve for cross-thread communication with Web Workers? Hard
5 Explain the Temporal API's goals and why it aims to replace the legacy `Date` object. Medium
6 How does `Intl.NumberFormat` and `Intl.DateTimeFormat` simplify locale-aware formatting versus manual string building? Easy
7 Explain the lifecycle of a Custom Element (`connectedCallback`, `disconnectedCallback`, `attributeChangedCallback`). Hard
8 What is the Permissions API and how would you gracefully handle a denied camera/microphone permission? Medium