From 29bb7936f37579c4621714c300e797c8f24ffa6e Mon Sep 17 00:00:00 2001
From: Jan-Ivar Bruaroey <jan-ivar@users.noreply.github.com>
Date: Wed, 6 Dec 2023 00:39:14 +0000
Subject: [PATCH] Merge pull request #575 from jan-ivar/featuredetect2

SHA: 8b74ae04e04a106a4fcbe34e357ba76413024360
Reason: push, by jan-ivar

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 51 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 30 insertions(+), 21 deletions(-)

diff --git a/index.html b/index.html
index 7ee4e27..fc81572 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,7 @@
   <link href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED" rel="stylesheet">
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://www.w3.org/TR/webtransport/" rel="canonical">
-  <meta content="8e8f3a79dd3b94b3b2331456cd5f04593508559d" name="document-revision">
+  <meta content="8b74ae04e04a106a4fcbe34e357ba76413024360" name="document-revision">
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -1390,6 +1390,8 @@ <h2 class="heading settled" data-level="5" id="web-transport"><span class="secno
   /* a ReadableStream of WebTransportReceiveStream objects */
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream" id="ref-for-readablestream④"><c- n>ReadableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ReadableStream" href="#dom-webtransport-incomingunidirectionalstreams" id="ref-for-dom-webtransport-incomingunidirectionalstreams"><c- g>incomingUnidirectionalStreams</c-></a>;
   <a data-link-type="idl-name" href="#webtransportsendgroup" id="ref-for-webtransportsendgroup"><c- n>WebTransportSendGroup</c-></a> <a class="idl-code" data-link-type="method" href="#dom-webtransport-createsendgroup" id="ref-for-dom-webtransport-createsendgroup"><c- g>createSendGroup</c-></a>();
+
+  <c- b>static</c-> <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="boolean" href="#dom-webtransport-supportsreliableonly" id="ref-for-dom-webtransport-supportsreliableonly"><c- g>supportsReliableOnly</c-></a>;
 };
 
 <c- b>enum</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="enum" data-export id="enumdef-webtransportreliabilitymode"><code><c- g>WebTransportReliabilityMode</c-></code></dfn> {
@@ -1785,13 +1787,16 @@ <h3 class="heading settled" data-level="5.3" id="webtransport-attributes"><span
  by the user agent, for a congestion control algorithm optimized for either
  throughput or low latency for sending on this connection. If a preference was
  requested but not satisfied, then the value is <code>"default"</code> The getter steps are to return <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑧">this</a>'s <code class="idl"><a data-link-type="idl" href="#dom-webtransport-congestioncontrol-slot" id="ref-for-dom-webtransport-congestioncontrol-slot①">[[CongestionControl]]</a></code>.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransport" data-dfn-type="attribute" data-export id="dom-webtransport-supportsreliableonly"><code>supportsReliableOnly</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①">boolean</a>, readonly</span>
+    <dd data-md>
+     <p>Returns true if the user agent supports <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①④">WebTransport sessions</a> over exclusively reliable <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection②">connections</a>, otherwise false.</p>
    </dl>
    <h3 class="heading settled" data-level="5.4" id="webtransport-methods"><span class="secno">5.4. </span><span class="content">Methods</span><a class="self-link" href="#webtransport-methods"></a></h3>
    <div class="algorithm" data-algorithm="close(closeInfo)" data-algorithm-for="WebTransport">
     <dl>
      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransport" data-dfn-type="method" data-export data-lt="close(closeInfo)|close()" id="dom-webtransport-close"><code>close(closeInfo)</code></dfn>
      <dd data-md>
-      <p>Terminates the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①④">WebTransport session</a> associated with the WebTransport object.</p>
+      <p>Terminates the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑤">WebTransport session</a> associated with the WebTransport object.</p>
       <p>When close is called, the user agent MUST run the following steps:</p>
       <ol>
        <li data-md>
@@ -2059,7 +2064,7 @@ <h3 class="heading settled" data-level="5.5" id="webtransport-procedures"><span
    </div>
    <h3 class="heading settled" data-level="5.6" id="web-transport-termination"><span class="secno">5.6. </span><span class="content">Session termination not initiated by the client</span><a class="self-link" href="#web-transport-termination"></a></h3>
    <div class="algorithm" data-algorithm="termination-initiated-by-server">
-     Whenever a <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑤">WebTransport session</a> which is associated with a <code class="idl"><a data-link-type="idl" href="#webtransport" id="ref-for-webtransport①⑧">WebTransport</a></code> <var>transport</var> is <a data-link-type="dfn" href="#session-terminated" id="ref-for-session-terminated">terminated</a> with optionally <var>code</var> and <var>reasonBytes</var>, run these steps: 
+     Whenever a <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑥">WebTransport session</a> which is associated with a <code class="idl"><a data-link-type="idl" href="#webtransport" id="ref-for-webtransport①⑧">WebTransport</a></code> <var>transport</var> is <a data-link-type="dfn" href="#session-terminated" id="ref-for-session-terminated">terminated</a> with optionally <var>code</var> and <var>reasonBytes</var>, run these steps: 
     <ol>
      <li data-md>
       <p>Let <var>cleanly</var> be a boolean representing whether <var>transport</var>.<code class="idl"><a data-link-type="idl" href="#dom-webtransport-session-slot" id="ref-for-dom-webtransport-session-slot①①">[[Session]]</a></code>'s <a data-link-type="dfn" href="#connect-stream" id="ref-for-connect-stream②">CONNECT stream</a> is in the "Data Recvd" state. <a data-link-type="biblio" href="#biblio-quic" title="QUIC: A UDP-Based Multiplexed and Secure Transport">[QUIC]</a></p>
@@ -2133,8 +2138,8 @@ <h3 class="heading settled" data-level="5.9" id="web-transport-configuration"><s
 };
 
 <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-webtransportoptions" id="ref-for-dictdef-webtransportoptions①"><c- g>WebTransportOptions</c-></a> {
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportoptions-allowpooling" id="ref-for-dom-webtransportoptions-allowpooling①"><c- g>allowPooling</c-></a> = <c- b>false</c->;
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportoptions-requireunreliable" id="ref-for-dom-webtransportoptions-requireunreliable①"><c- g>requireUnreliable</c-></a> = <c- b>false</c->;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportoptions-allowpooling" id="ref-for-dom-webtransportoptions-allowpooling①"><c- g>allowPooling</c-></a> = <c- b>false</c->;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportoptions-requireunreliable" id="ref-for-dom-webtransportoptions-requireunreliable①"><c- g>requireUnreliable</c-></a> = <c- b>false</c->;
   <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#dictdef-webtransporthash" id="ref-for-dictdef-webtransporthash①"><c- n>WebTransportHash</c-></a>> <a class="idl-code" data-link-type="dict-member" data-type="sequence<WebTransportHash> " href="#dom-webtransportoptions-servercertificatehashes" id="ref-for-dom-webtransportoptions-servercertificatehashes①"><c- g>serverCertificateHashes</c-></a>;
   <a data-link-type="idl-name" href="#enumdef-webtransportcongestioncontrol" id="ref-for-enumdef-webtransportcongestioncontrol④"><c- n>WebTransportCongestionControl</c-></a> <a class="idl-code" data-default="&quot;default&quot;" data-link-type="dict-member" data-type="WebTransportCongestionControl " href="#dom-webtransportoptions-congestioncontrol" id="ref-for-dom-webtransportoptions-congestioncontrol①"><c- g>congestionControl</c-></a> = "default";
 };
@@ -2146,15 +2151,15 @@ <h3 class="heading settled" data-level="5.9" id="web-transport-configuration"><s
 };
 </pre>
    <p><dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-webtransportoptions"><code>WebTransportOptions</code></dfn> is a dictionary of parameters
-that determine how the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑥">WebTransport session</a> is established and used.</p>
+that determine how the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑦">WebTransport session</a> is established and used.</p>
    <dl>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportOptions" data-dfn-type="dict-member" data-export id="dom-webtransportoptions-allowpooling"><code>allowPooling</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②">boolean</a>, defaulting to <code>false</code></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportOptions" data-dfn-type="dict-member" data-export id="dom-webtransportoptions-allowpooling"><code>allowPooling</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean④">boolean</a>, defaulting to <code>false</code></span>
     <dd data-md>
-     <p>When set to true, the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑦">WebTransport session</a> can be pooled, that is, its <a data-link-type="dfn" href="#underlying-connection" id="ref-for-underlying-connection③">underlying connection</a> can be shared with other WebTransport sessions.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportOptions" data-dfn-type="dict-member" data-export id="dom-webtransportoptions-requireunreliable"><code>requireUnreliable</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③">boolean</a>, defaulting to <code>false</code></span>
+     <p>When set to true, the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑧">WebTransport session</a> can be pooled, that is, its <a data-link-type="dfn" href="#underlying-connection" id="ref-for-underlying-connection③">underlying connection</a> can be shared with other WebTransport sessions.</p>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportOptions" data-dfn-type="dict-member" data-export id="dom-webtransportoptions-requireunreliable"><code>requireUnreliable</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑤">boolean</a>, defaulting to <code>false</code></span>
     <dd data-md>
-     <p>When set to true, the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑧">WebTransport session</a> cannot be established over an
- HTTP/2 <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection②">connection</a> if an HTTP/3 <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection③">connection</a> is not possible.</p>
+     <p>When set to true, the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑨">WebTransport session</a> cannot be established over an
+ HTTP/2 <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection③">connection</a> if an HTTP/3 <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection④">connection</a> is not possible.</p>
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportOptions" data-dfn-type="dict-member" data-export id="dom-webtransportoptions-servercertificatehashes"><code>serverCertificateHashes</code></dfn>, <span> of type sequence&lt;<a data-link-type="idl-name" href="#dictdef-webtransporthash" id="ref-for-dictdef-webtransporthash②">WebTransportHash</a>></span>
     <dd data-md>
      <p>This option is only supported for transports using dedicated connections.
@@ -2249,7 +2254,7 @@ <h3 class="heading settled" data-level="5.11" id="uni-stream-options"><span clas
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-webtransportsendstreamoptions" id="ref-for-dictdef-webtransportsendstreamoptions②"><c- g>WebTransportSendStreamOptions</c-></a> {
   <a data-link-type="idl-name" href="#webtransportsendgroup" id="ref-for-webtransportsendgroup③"><c- n>WebTransportSendGroup</c-></a>? <a class="idl-code" data-default="null" data-link-type="dict-member" data-type="WebTransportSendGroup? " href="#dom-webtransportsendstreamoptions-sendgroup" id="ref-for-dom-webtransportsendstreamoptions-sendgroup②"><c- g>sendGroup</c-></a> = <c- b>null</c->;
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long-long" id="ref-for-idl-long-long"><c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-default="0" data-link-type="dict-member" data-type="long long " href="#dom-webtransportsendstreamoptions-sendorder" id="ref-for-dom-webtransportsendstreamoptions-sendorder②"><c- g>sendOrder</c-></a> = 0;
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean④"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportsendstreamoptions-waituntilavailable" id="ref-for-dom-webtransportsendstreamoptions-waituntilavailable②"><c- g>waitUntilAvailable</c-></a> = <c- b>false</c->;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑥"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean " href="#dom-webtransportsendstreamoptions-waituntilavailable" id="ref-for-dom-webtransportsendstreamoptions-waituntilavailable②"><c- g>waitUntilAvailable</c-></a> = <c- b>false</c->;
 };
 </pre>
    <p>The dictionary SHALL have the following attributes:</p>
@@ -2270,7 +2275,7 @@ <h3 class="heading settled" data-level="5.11" id="uni-stream-options"><span clas
  order numbers.</p>
      <p class="note" role="note"><span class="marker">Note:</span> This is sender-side data prioritization which does not guarantee
  reception order.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportSendStreamOptions" data-dfn-type="dict-member" data-export id="dom-webtransportsendstreamoptions-waituntilavailable"><code>waitUntilAvailable</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑤">boolean</a>, defaulting to <code>false</code></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportSendStreamOptions" data-dfn-type="dict-member" data-export id="dom-webtransportsendstreamoptions-waituntilavailable"><code>waitUntilAvailable</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑦">boolean</a>, defaulting to <code>false</code></span>
     <dd data-md>
      <p>If true, the promise returned by the <code class="idl"><a data-link-type="idl" href="#dom-webtransport-createunidirectionalstream" id="ref-for-dom-webtransport-createunidirectionalstream②">createUnidirectionalStream</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-webtransport-createbidirectionalstream" id="ref-for-dom-webtransport-createbidirectionalstream②">createBidirectionalStream</a></code> call will not be <a data-link-type="dfn" href="http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise-objects" id="ref-for-sec-promise-objects②⑦">settled</a> until either the <a data-link-type="dfn" href="#underlying-connection" id="ref-for-underlying-connection④">underlying connection</a> has sufficient flow control
  credit to create the stream, or the connection reaches a state in which no
@@ -2278,10 +2283,10 @@ <h3 class="heading settled" data-level="5.11" id="uni-stream-options"><span clas
    </dl>
    <h3 class="heading settled" data-level="5.12" id="web-transport-connection-stats"><span class="secno">5.12. </span><span class="content"><code>WebTransportConnectionStats</code> Dictionary</span><a class="self-link" href="#web-transport-connection-stats"></a></h3>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-webtransportconnectionstats"><code>WebTransportConnectionStats</code></dfn> dictionary includes information
-on WebTransport-specific stats about the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session①⑨">WebTransport session</a>'s <a data-link-type="dfn" href="#underlying-connection" id="ref-for-underlying-connection⑤">underlying connection</a>.</p>
-   <p class="note" role="note"><span class="marker">Note:</span> When pooling is used, multiple <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②⓪">WebTransport sessions</a> pooled
-on the same <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection④">connection</a> all receive the same information, i.e. the information
-is disclosed across pooled <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②①"> sessions</a> holding the
+on WebTransport-specific stats about the <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②⓪">WebTransport session</a>'s <a data-link-type="dfn" href="#underlying-connection" id="ref-for-underlying-connection⑤">underlying connection</a>.</p>
+   <p class="note" role="note"><span class="marker">Note:</span> When pooling is used, multiple <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②①">WebTransport sessions</a> pooled
+on the same <a data-link-type="dfn" href="https://fetch.spec.whatwg.org/#concept-connection" id="ref-for-concept-connection⑤">connection</a> all receive the same information, i.e. the information
+is disclosed across pooled <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②②"> sessions</a> holding the
 same <a href="https://fetch.spec.whatwg.org/#network-partition-keys">network partition key</a>.</p>
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-webtransportconnectionstats" id="ref-for-dictdef-webtransportconnectionstats②"><c- g>WebTransportConnectionStats</c-></a> {
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long"><c- b>unsigned</c-> <c- b>long</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long long " href="#dom-webtransportconnectionstats-bytessent" id="ref-for-dom-webtransportconnectionstats-bytessent"><c- g>bytesSent</c-></a>;
@@ -2335,7 +2340,7 @@ <h3 class="heading settled" data-level="5.12" id="web-transport-connection-stats
     <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="WebTransportConnectionStats" data-dfn-type="dict-member" data-export id="dom-webtransportconnectionstats-estimatedsendrate"><code>estimatedSendRate</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long-long" id="ref-for-idl-unsigned-long-long①③">unsigned long long</a>, nullable</span>
     <dd data-md>
      <p>The estimated rate at which queued data will be sent by the user agent, in bits per second.
- This rate applies to all streams and datagrams that share a <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②②">WebTransport session</a> and is calculated by the congestion control algorithm (potentially chosen by <code class="idl"><a data-link-type="idl" href="#dom-webtransport-congestioncontrol" id="ref-for-dom-webtransport-congestioncontrol①">congestionControl</a></code>). If the user agent does not
+ This rate applies to all streams and datagrams that share a <a data-link-type="dfn" href="#protocol-webtransport-session" id="ref-for-protocol-webtransport-session②③">WebTransport session</a> and is calculated by the congestion control algorithm (potentially chosen by <code class="idl"><a data-link-type="idl" href="#dom-webtransport-congestioncontrol" id="ref-for-dom-webtransport-congestioncontrol①">congestionControl</a></code>). If the user agent does not
  currently have an estimate, the member MUST be the <code>null</code> value.
  The member can be <code>null</code> even if it was not <code>null</code> in previous results.</p>
    </dl>
@@ -3941,6 +3946,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-webtransporterroroptions-streamerrorcode">dict-member for WebTransportErrorOptions</a><span>, in § 10</span>
     </ul>
    <li><a href="#strict-ordering">strict ordering</a><span>, in § 5.11</span>
+   <li><a href="#dom-webtransport-supportsreliableonly">supportsReliableOnly</a><span>, in § 5.3</span>
    <li><a href="#dom-webtransportreliabilitymode-supports-unreliable">"supports-unreliable"</a><span>, in § 5</span>
    <li><a href="#session-terminate">terminate</a><span>, in § 3.1</span>
    <li><a href="#session-terminated">terminated</a><span>, in § 3.1</span>
@@ -4282,6 +4288,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   /* a ReadableStream of WebTransportReceiveStream objects */
   <c- b>readonly</c-> <c- b>attribute</c-> <a data-link-type="idl-name" href="https://streams.spec.whatwg.org/#readablestream"><c- n>ReadableStream</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="ReadableStream" href="#dom-webtransport-incomingunidirectionalstreams"><c- g>incomingUnidirectionalStreams</c-></a>;
   <a data-link-type="idl-name" href="#webtransportsendgroup"><c- n>WebTransportSendGroup</c-></a> <a class="idl-code" data-link-type="method" href="#dom-webtransport-createsendgroup"><c- g>createSendGroup</c-></a>();
+
+  <c- b>static</c-> <c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="boolean" href="#dom-webtransport-supportsreliableonly"><c- g>supportsReliableOnly</c-></a>;
 };
 
 <c- b>enum</c-> <a href="#enumdef-webtransportreliabilitymode"><code><c- g>WebTransportReliabilityMode</c-></code></a> {
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@@ -4827,7 +4835,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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@@ -4845,7 +4853,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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@@ -4925,6 +4933,7 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
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