WebTransport
For gaming, live collaboration, and real-time data where WebSocket's TCP head-of-line blocking matters. Runs over QUIC so multiple streams don't block each other.
What It Defines
W3C API for low-latency, bidirectional, multiplexed communication over HTTP/3 (QUIC). Provides both datagram and stream-based communication without head-of-line blocking. Successor to WebSocket for latency-sensitive use cases.
Canonical (Normative)
Convenient (Practical)
Publishes web platform specs including CSS, accessibility, security policies, Service Workers, Web App Manifest, and many browser APIs. Also maintains some versioned HTML/DOM specs.
Related Specs
Real-time features — chat, live dashboards, collaborative editing, notifications, trading UIs — run on WebSockets. Every serious app eventually needs them.
HTTP/3 runs on QUIC. Modern CDNs and browsers use it by default. It fixes TCP's head-of-line blocking problem for multiplexed requests.
HTTP/3 is the current performance frontier for web delivery. CDNs enable it automatically; understand it for performance tuning and debugging.