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For a decade, real-time on the web meant one thing: a WebSocket. But a WebSocket is a single TCP connection, which means one lost packet can freeze every message behind it, and it only knows how to deliver data one way — reliably and in order, whether you wanted that or not. WebTransport is the newer browser API that runs over HTTP/3 and fixes both limits: many independent streams, plus a lossy express lane for data that's worthless once it's stale.