diff --git a/api/WebTransportDatagramDuplexStream.json b/api/WebTransportDatagramDuplexStream.json
index aac155163a8d9b..7b0a43bf3bd88a 100644
--- a/api/WebTransportDatagramDuplexStream.json
+++ b/api/WebTransportDatagramDuplexStream.json
@@ -118,10 +118,10 @@
           }
         }
       },
-      "incomingHighWaterMark": {
+      "incomingMaxAge": {
         "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/incomingHighWaterMark",
-          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-incominghighwatermark",
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/incomingMaxAge",
+          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-incomingmaxage",
           "tags": [
             "web-features:webtransport"
           ],
@@ -162,15 +162,15 @@
           }
         }
       },
-      "incomingMaxAge": {
+      "incomingMaxBufferedDatagrams": {
         "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/incomingMaxAge",
-          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-incomingmaxage",
+          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-incomingmaxbuffereddatagrams",
           "tags": [
             "web-features:webtransport"
           ],
           "support": {
             "chrome": {
+              "alternative_name": "incomingHighWaterMark",
               "version_added": "97"
             },
             "chrome_android": "mirror",
@@ -185,6 +185,7 @@
             },
             "edge": "mirror",
             "firefox": {
+              "alternative_name": "incomingHighWaterMark",
               "version_added": "114"
             },
             "firefox_android": "mirror",
@@ -192,6 +193,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
+              "alternative_name": "incomingHighWaterMark",
               "version_added": "26.4"
             },
             "safari_ios": "mirror",
@@ -250,10 +252,10 @@
           }
         }
       },
-      "outgoingHighWaterMark": {
+      "outgoingMaxAge": {
         "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/outgoingHighWaterMark",
-          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-outgoinghighwatermark",
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/outgoingMaxAge",
+          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-outgoingmaxage",
           "tags": [
             "web-features:webtransport"
           ],
@@ -294,15 +296,15 @@
           }
         }
       },
-      "outgoingMaxAge": {
+      "outgoingMaxBufferedDatagrams": {
         "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/API/WebTransportDatagramDuplexStream/outgoingMaxAge",
-          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-outgoingmaxage",
+          "spec_url": "https://w3c.github.io/webtransport/#dom-webtransportdatagramduplexstream-outgoingmaxbuffereddatagrams",
           "tags": [
             "web-features:webtransport"
           ],
           "support": {
             "chrome": {
+              "alternative_name": "outgoingHighWaterMark",
               "version_added": "97"
             },
             "chrome_android": "mirror",
@@ -317,6 +319,7 @@
             },
             "edge": "mirror",
             "firefox": {
+              "alternative_name": "outgoingHighWaterMark",
               "version_added": "114"
             },
             "firefox_android": "mirror",
@@ -324,6 +327,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
+              "alternative_name": "outgoingHighWaterMark",
               "version_added": "26.4"
             },
             "safari_ios": "mirror",