5 files changed, 23 insertions, 2 deletions
diff --git a/components/script/dom/navigator.rs b/components/script/dom/navigator.rs
index 9803b6562b6..fe01105b787 100644
--- a/components/script/dom/navigator.rs
+++ b/components/script/dom/navigator.rs
@@ -73,4 +73,9 @@ impl NavigatorMethods for Navigator {
     fn Bluetooth(&self) -> Root<Bluetooth> {
         self.bluetooth.or_init(|| Bluetooth::new(self.global().r()))
     }
+
+    // https://html.spec.whatwg.org/multipage/#navigatorlanguage
+    fn Language(&self) -> DOMString {
+        navigatorinfo::Language()
+    }
 }
diff --git a/components/script/dom/navigatorinfo.rs b/components/script/dom/navigatorinfo.rs
index 1d86deb45ad..f27e46ed91b 100644
--- a/components/script/dom/navigatorinfo.rs
+++ b/components/script/dom/navigatorinfo.rs
@@ -43,3 +43,7 @@ pub fn UserAgent() -> DOMString {
 pub fn AppVersion() -> DOMString {
     DOMString::from("4.0")
 }
+
+pub fn Language() -> DOMString {
+    DOMString::from("en-US")
+}
diff --git a/components/script/dom/webidls/Navigator.webidl b/components/script/dom/webidls/Navigator.webidl
index 8a7a9ef914e..c23415aa094 100644
--- a/components/script/dom/webidls/Navigator.webidl
+++ b/components/script/dom/webidls/Navigator.webidl
@@ -9,7 +9,7 @@ interface Navigator {
 };
 Navigator implements NavigatorID;
 Navigator implements NavigatorBluetooth;
-//Navigator implements NavigatorLanguage;
+Navigator implements NavigatorLanguage;
 //Navigator implements NavigatorOnLine;
 //Navigator implements NavigatorContentUtils;
 //Navigator implements NavigatorStorageUtils;
@@ -31,3 +31,10 @@ interface NavigatorID {
 interface NavigatorBluetooth {
     readonly attribute Bluetooth bluetooth;
 };
+
+// https://html.spec.whatwg.org/multipage/#navigatorlanguage
+[NoInterfaceObject/*, Exposed=Window,Worker*/]
+interface NavigatorLanguage {
+  readonly attribute DOMString language;
+  //readonly attribute DOMString[] languages;
+};
diff --git a/components/script/dom/webidls/WorkerNavigator.webidl b/components/script/dom/webidls/WorkerNavigator.webidl
index ec62d556c4b..c44edbfe58a 100644
--- a/components/script/dom/webidls/WorkerNavigator.webidl
+++ b/components/script/dom/webidls/WorkerNavigator.webidl
@@ -7,5 +7,5 @@
 //[Exposed=Worker]
 interface WorkerNavigator {};
 WorkerNavigator implements NavigatorID;
-//WorkerNavigator implements NavigatorLanguage;
+WorkerNavigator implements NavigatorLanguage;
 //WorkerNavigator implements NavigatorOnLine;
diff --git a/components/script/dom/workernavigator.rs b/components/script/dom/workernavigator.rs
index 146c098d7d1..07bf443d33c 100644
--- a/components/script/dom/workernavigator.rs
+++ b/components/script/dom/workernavigator.rs
@@ -66,4 +66,9 @@ impl WorkerNavigatorMethods for WorkerNavigator {
     fn AppVersion(&self) -> DOMString {
         navigatorinfo::AppVersion()
     }
+
+    // https://html.spec.whatwg.org/multipage/#navigatorlanguage
+    fn Language(&self) -> DOMString {
+        navigatorinfo::Language()
+    }
 }