diff --git a/components/script/dom/navigator.rs b/components/script/dom/navigator.rs
index d4666ba2aa6..8a5524b437b 100644
--- a/components/script/dom/navigator.rs
+++ b/components/script/dom/navigator.rs
@@ -66,6 +66,21 @@ impl NavigatorMethods for Navigator {
         navigatorinfo::Product()
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-productsub
+    fn ProductSub(&self) -> DOMString {
+        navigatorinfo::ProductSub()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-vendor
+    fn Vendor(&self) -> DOMString {
+        navigatorinfo::Vendor()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-vendorsub
+    fn VendorSub(&self) -> DOMString {
+        navigatorinfo::VendorSub()
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-navigator-taintenabled
     fn TaintEnabled(&self) -> bool {
         navigatorinfo::TaintEnabled()
diff --git a/components/script/dom/navigatorinfo.rs b/components/script/dom/navigatorinfo.rs
index 234b75024f3..117bfce87c1 100644
--- a/components/script/dom/navigatorinfo.rs
+++ b/components/script/dom/navigatorinfo.rs
@@ -9,6 +9,18 @@ pub fn Product() -> DOMString {
     DOMString::from("Gecko")
 }
 
+pub fn ProductSub() -> DOMString {
+    DOMString::from("20100101")
+}
+
+pub fn Vendor() -> DOMString {
+    DOMString::from("")
+}
+
+pub fn VendorSub() -> DOMString {
+    DOMString::from("")
+}
+
 pub fn TaintEnabled() -> bool {
     false
 }
diff --git a/components/script/dom/webidls/Navigator.webidl b/components/script/dom/webidls/Navigator.webidl
index 1b4f18640ff..eb3577159fa 100644
--- a/components/script/dom/webidls/Navigator.webidl
+++ b/components/script/dom/webidls/Navigator.webidl
@@ -22,8 +22,11 @@ interface NavigatorID {
   readonly attribute DOMString appVersion;
   readonly attribute DOMString platform;
   readonly attribute DOMString product; // constant "Gecko"
+  [Exposed=Window] readonly attribute DOMString productSub;
   boolean taintEnabled(); // constant false
   readonly attribute DOMString userAgent;
+  [Exposed=Window] readonly attribute DOMString vendor;
+  [Exposed=Window] readonly attribute DOMString vendorSub; // constant ""
 };
 
 // https://webbluetoothcg.github.io/web-bluetooth/#navigator-extensions
diff --git a/components/script/dom/workernavigator.rs b/components/script/dom/workernavigator.rs
index 9753c85c3bc..6c4867eda9d 100644
--- a/components/script/dom/workernavigator.rs
+++ b/components/script/dom/workernavigator.rs
@@ -42,6 +42,21 @@ impl WorkerNavigatorMethods for WorkerNavigator {
         navigatorinfo::Product()
     }
 
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-productsub
+    fn ProductSub(&self) -> DOMString {
+        navigatorinfo::ProductSub()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-vendor
+    fn Vendor(&self) -> DOMString {
+        navigatorinfo::Vendor()
+    }
+
+    // https://html.spec.whatwg.org/multipage/#dom-navigator-vendorsub
+    fn VendorSub(&self) -> DOMString {
+        navigatorinfo::VendorSub()
+    }
+
     // https://html.spec.whatwg.org/multipage/#dom-navigator-taintenabled
     fn TaintEnabled(&self) -> bool {
         navigatorinfo::TaintEnabled()
diff --git a/tests/wpt/metadata/html/dom/interfaces.https.html.ini b/tests/wpt/metadata/html/dom/interfaces.https.html.ini
index 7efd3a3c165..1dd351142d6 100644
--- a/tests/wpt/metadata/html/dom/interfaces.https.html.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.https.html.ini
@@ -4976,15 +4976,6 @@
   [PromiseRejectionEvent interface: attribute promise]
     expected: FAIL
 
-  [Navigator interface: attribute productSub]
-    expected: FAIL
-
-  [Navigator interface: attribute vendor]
-    expected: FAIL
-
-  [Navigator interface: attribute vendorSub]
-    expected: FAIL
-
   [Navigator interface: attribute oscpu]
     expected: FAIL
 
@@ -5003,15 +4994,6 @@
   [Navigator interface: attribute hardwareConcurrency]
     expected: FAIL
 
-  [Navigator interface: window.navigator must inherit property "productSub" with the proper type]
-    expected: FAIL
-
-  [Navigator interface: window.navigator must inherit property "vendor" with the proper type]
-    expected: FAIL
-
-  [Navigator interface: window.navigator must inherit property "vendorSub" with the proper type]
-    expected: FAIL
-
   [Navigator interface: window.navigator must inherit property "oscpu" with the proper type]
     expected: FAIL
 
@@ -10049,15 +10031,6 @@
   [PromiseRejectionEvent interface: attribute promise]
     expected: FAIL
 
-  [Navigator interface: attribute productSub]
-    expected: FAIL
-
-  [Navigator interface: attribute vendor]
-    expected: FAIL
-
-  [Navigator interface: attribute vendorSub]
-    expected: FAIL
-
   [Navigator interface: attribute oscpu]
     expected: FAIL
 
@@ -10076,15 +10049,6 @@
   [Navigator interface: attribute hardwareConcurrency]
     expected: FAIL
 
-  [Navigator interface: window.navigator must inherit property "productSub" with the proper type]
-    expected: FAIL
-
-  [Navigator interface: window.navigator must inherit property "vendor" with the proper type]
-    expected: FAIL
-
-  [Navigator interface: window.navigator must inherit property "vendorSub" with the proper type]
-    expected: FAIL
-
   [Navigator interface: window.navigator must inherit property "oscpu" with the proper type]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/dom/interfaces.worker.js.ini b/tests/wpt/metadata/html/dom/interfaces.worker.js.ini
index 96a83788c9b..b129834a933 100644
--- a/tests/wpt/metadata/html/dom/interfaces.worker.js.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.worker.js.ini
@@ -630,6 +630,24 @@
   [WorkerNavigator interface: self.navigator must not have property "taintEnabled"]
     expected: FAIL
 
+  [WorkerNavigator interface: self.navigator must not have property "vendor"]
+    expected: FAIL
+
+  [WorkerNavigator interface: self.navigator must not have property "vendorSub"]
+    expected: FAIL
+
+  [WorkerNavigator interface: self.navigator must not have property "productSub"]
+    expected: FAIL
+
+  [WorkerNavigator interface: member vendor]
+    expected: FAIL
+
+  [WorkerNavigator interface: member vendorSub]
+    expected: FAIL
+
+  [WorkerNavigator interface: member productSub]
+    expected: FAIL
+
   [OffscreenCanvasRenderingContext2D interface: operation arc(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, boolean)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/workers/interfaces.worker.js.ini b/tests/wpt/metadata/workers/interfaces.worker.js.ini
index 891223a96c5..5dd1628420c 100644
--- a/tests/wpt/metadata/workers/interfaces.worker.js.ini
+++ b/tests/wpt/metadata/workers/interfaces.worker.js.ini
@@ -30,6 +30,24 @@
   [WorkerNavigator interface: attribute onLine]
     expected: FAIL
 
+  [WorkerNavigator interface: member productSub]
+    expected: FAIL
+
+  [WorkerNavigator interface: member vendor]
+    expected: FAIL
+
+  [WorkerNavigator interface: member vendorSub]
+    expected: FAIL
+
+  [WorkerNavigator interface: self.navigator must not have property "productSub"]
+    expected: FAIL
+
+  [WorkerNavigator interface: self.navigator must not have property "vendor"]
+    expected: FAIL
+
+  [WorkerNavigator interface: self.navigator must not have property "vendorSub"]
+    expected: FAIL
+
   [WorkerNavigator interface: self.navigator must inherit property "languages" with the proper type (7)]
     expected: FAIL