🏠 New in Low Baseline Support: WebTransport
March 24, 2026
The WebTransport API transmits data between a client and a server, by using the HTTP/3 protocol.
Source features
api.WebTransport[mdn]api.WebTransport.WebTransport[mdn]api.WebTransport.close[mdn]api.WebTransport.closed[mdn]api.WebTransport.createBidirectionalStream[mdn]api.WebTransport.datagrams[mdn]api.WebTransport.incomingBidirectionalStreams[mdn]api.WebTransport.incomingUnidirectionalStreams[mdn]api.WebTransport.ready[mdn]api.WebTransportBidirectionalStream[mdn]api.WebTransportBidirectionalStream.readable[mdn]api.WebTransportBidirectionalStream.writable[mdn]api.WebTransportDatagramDuplexStream[mdn]api.WebTransportDatagramDuplexStream.incomingHighWaterMark[mdn]api.WebTransportDatagramDuplexStream.incomingMaxAge[mdn]api.WebTransportDatagramDuplexStream.maxDatagramSize[mdn]api.WebTransportDatagramDuplexStream.outgoingHighWaterMark[mdn]api.WebTransportDatagramDuplexStream.outgoingMaxAge[mdn]api.WebTransportDatagramDuplexStream.readable[mdn]api.WebTransportError[mdn]api.WebTransportError.WebTransportError[mdn]api.WebTransportError.source[mdn]api.WebTransportError.streamErrorCode[mdn]api.WebTransport.WebTransport.options_serverCertificateHashes_parameter[mdn]api.WebTransport.byob_readers[mdn]api.WebTransport.createUnidirectionalStream[mdn]api.WebTransport.createUnidirectionalStream.byob_readers[mdn]api.WebTransportDatagramDuplexStream.byob_readers[mdn]api.WebTransport.WebTransport.options_allowPooling_parameter[mdn]api.WebTransport.WebTransport.options_congestionControl_parameter[mdn]api.WebTransport.WebTransport.options_requireUnreliable_parameter[mdn]api.WebTransport.congestionControl[mdn]api.WebTransport.reliability[mdn]api.WebTransportBidirectionalStream.readable.returns_WebTransportReceiveStream[mdn]api.WebTransportBidirectionalStream.writable.returns_WebTransportSendStream[mdn]api.WebTransportReceiveStream[mdn]api.WebTransportReceiveStream.getStats[mdn]api.WebTransportSendStream[mdn]api.WebTransportSendStream.getStats[mdn]api.WebTransportSendStream.getWriter[mdn]api.WebTransport.createBidirectionalStream.options_sendOrder_parameter[mdn]api.WebTransportSendStream.sendOrder[mdn]api.WebTransport.createUnidirectionalStream.options_sendOrder_parameter[mdn]api.WebTransport.getStats[mdn]