1 files changed, 13 insertions, 1 deletions
diff --git a/testing/web-platform/tests/interfaces/webtransport.idl b/testing/web-platform/tests/interfaces/webtransport.idl
index 281c096d21..e598059c93 100644
--- a/testing/web-platform/tests/interfaces/webtransport.idl
+++ b/testing/web-platform/tests/interfaces/webtransport.idl
@@ -23,6 +23,9 @@ interface WebTransport {
   readonly attribute Promise<undefined> ready;
   readonly attribute WebTransportReliabilityMode reliability;
   readonly attribute WebTransportCongestionControl congestionControl;
+  [EnforceRange] attribute unsigned short? anticipatedConcurrentIncomingUnidirectionalStreams;
+  [EnforceRange] attribute unsigned short? anticipatedConcurrentIncomingBidirectionalStreams;
+
   readonly attribute Promise<WebTransportCloseInfo> closed;
   readonly attribute Promise<undefined> draining;
   undefined close(optional WebTransportCloseInfo closeInfo = {});
@@ -59,6 +62,8 @@ dictionary WebTransportOptions {
   boolean requireUnreliable = false;
   sequence<WebTransportHash> serverCertificateHashes;
   WebTransportCongestionControl congestionControl = "default";
+  [EnforceRange] unsigned short? anticipatedConcurrentIncomingUnidirectionalStreams = null;
+  [EnforceRange] unsigned short? anticipatedConcurrentIncomingBidirectionalStreams = null;
 };
 
 enum WebTransportCongestionControl {
@@ -93,8 +98,9 @@ dictionary WebTransportConnectionStats {
 };
 
 dictionary WebTransportDatagramStats {
-  unsigned long long expiredOutgoing;
   unsigned long long droppedIncoming;
+  unsigned long long expiredIncoming;
+  unsigned long long expiredOutgoing;
   unsigned long long lostOutgoing;
 };
 
@@ -103,6 +109,7 @@ interface WebTransportSendStream : WritableStream {
   attribute WebTransportSendGroup? sendGroup;
   attribute long long sendOrder;
   Promise<WebTransportSendStreamStats> getStats();
+  WebTransportWriter getWriter();
 };
 
 dictionary WebTransportSendStreamStats {
@@ -132,6 +139,11 @@ interface WebTransportBidirectionalStream {
   readonly attribute WebTransportSendStream writable;
 };
 
+[Exposed=*, SecureContext]
+interface WebTransportWriter : WritableStreamDefaultWriter {
+  Promise<undefined> atomicWrite(optional any chunk);
+};
+
 [Exposed=(Window,Worker), Serializable, SecureContext]
 interface WebTransportError : DOMException {
   constructor(optional DOMString message = "", optional WebTransportErrorOptions options = {});