[TOC] ||| |-|-| |HTTP | fetch Response Request Headers AbortController AbortSignal| |URLs | URL URLSearchParams| |Streams | ReadableStream WritableStream TransformStream ByteLengthQueuingStrategy CountQueuingStrategy and associated classes| |Blob | Blob| |WebSockets | WebSocket| |Encoding and decoding | atob btoa TextEncoder TextDecoder| |Timeouts | setTimeout clearTimeout| |Intervals | setIntervalclearInterval| |Crypto | crypto SubtleCrypto CryptoKey| |Debugging | console performance| |Microtasks | queueMicrotask| |Errors | reportError ResolveError BuildError| |User interaction | alert confirm prompt (intended for interactive CLIs)| |Realms | ShadowRealm| |Events | EventTarget Event ErrorEvent CloseEvent MessageEvent| ~