This is the official W3C WebTransport specification repository. It defines a JavaScript API for bidirectional, multiplexed network communication over QUIC and HTTP/3, providing reliable streams and unreliable datagrams. The repository contains the spec source in Bikeshed format (index.bs), supporting documents (explainer, use-cases, security questionnaire), and functional sample implementations (echo client/server and a WebCodecs-based video streaming demo). The core deliverable is the specification, while the samples serve as proof-of-concept implementations. The codebase is a hybrid: primarily a standards document, but includes runnable demo applications that illustrate the API usage patterns. The spec is still in early draft stage and references evolving IETF protocols.