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diff --git a/dom/webidl/WebTransport.webidl b/dom/webidl/WebTransport.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* https://w3c.github.io/webtransport */
+
+/* https://w3c.github.io/webtransport/#web-transport-configuration */
+
+dictionary WebTransportHash {
+  DOMString algorithm;
+  BufferSource value;
+};
+
+dictionary WebTransportOptions {
+  boolean allowPooling = false;
+  boolean requireUnreliable = false;
+  sequence<WebTransportHash> serverCertificateHashes;
+  WebTransportCongestionControl congestionControl = "default";
+};
+
+enum WebTransportCongestionControl {
+  "default",
+  "throughput",
+  "low-latency",
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-close-info */
+
+dictionary WebTransportCloseInfo {
+  unsigned long closeCode = 0;
+  UTF8String reason = "";
+};
+
+/* https://w3c.github.io/webtransport/#uni-stream-options */
+dictionary WebTransportSendStreamOptions {
+  long long? sendOrder = null;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-stats */
+
+dictionary WebTransportStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesSent;
+  unsigned long long packetsSent;
+  unsigned long long packetsLost;
+  unsigned long numOutgoingStreamsCreated;
+  unsigned long numIncomingStreamsCreated;
+  unsigned long long bytesReceived;
+  unsigned long long packetsReceived;
+  DOMHighResTimeStamp smoothedRtt;
+  DOMHighResTimeStamp rttVariation;
+  DOMHighResTimeStamp minRtt;
+  WebTransportDatagramStats datagrams;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport-stats%E2%91%A0 */
+
+dictionary WebTransportDatagramStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long expiredOutgoing;
+  unsigned long long droppedIncoming;
+  unsigned long long lostOutgoing;
+};
+
+/* https://w3c.github.io/webtransport/#web-transport */
+
+[Exposed=(Window,Worker), SecureContext, Pref="network.webtransport.enabled"]
+interface WebTransport {
+  [Throws]
+  constructor(USVString url, optional WebTransportOptions options = {});
+
+  [NewObject]
+  Promise<WebTransportStats> getStats();
+  readonly attribute Promise<undefined> ready;
+  readonly attribute WebTransportReliabilityMode reliability;
+  readonly attribute WebTransportCongestionControl congestionControl;
+  readonly attribute Promise<WebTransportCloseInfo> closed;
+  [Throws] undefined close(optional WebTransportCloseInfo closeInfo = {});
+
+  [Throws] readonly attribute WebTransportDatagramDuplexStream datagrams;
+
+  [NewObject]
+  Promise<WebTransportBidirectionalStream> createBidirectionalStream(
+     optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportBidirectionalStream objects */
+  readonly attribute ReadableStream incomingBidirectionalStreams;
+
+
+  /* XXX spec says this should be WebTransportSendStream */
+  [NewObject]
+  Promise<WritableStream> createUnidirectionalStream(
+    optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportReceiveStream objects */
+  readonly attribute ReadableStream incomingUnidirectionalStreams;
+};
+
+enum WebTransportReliabilityMode {
+  "pending",
+  "reliable-only",
+  "supports-unreliable",
+};