diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index 84222389cc..695eceb8c8 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -1160,9 +1160,6 @@ WebIDL::ExceptionOr<void> Window::initialize_web_interfaces(Badge<WindowEnvironm
     // Legacy
     define_native_accessor(realm, "event", event_getter, event_setter, JS::Attribute::Enumerable);
 
-    define_native_accessor(realm, "navigator", navigator_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
-    define_native_accessor(realm, "clientInformation", navigator_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
-
     // NOTE: location is marked as [LegacyUnforgeable], meaning it isn't configurable.
     define_native_accessor(realm, "location", location_getter, location_setter, JS::Attribute::Enumerable);
 
@@ -1207,6 +1204,13 @@ static JS::ThrowCompletionOr<HTML::Window*> impl_from(JS::VM& vm)
     return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Window");
 }
 
+// https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator
+JS::NonnullGCPtr<Navigator> Window::navigator() const
+{
+    // The navigator and clientInformation getter steps are to return this's associated Navigator.
+    return *m_navigator;
+}
+
 // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-alert
 void Window::alert(String const& message)
 {
@@ -1912,10 +1916,4 @@ JS_DEFINE_NATIVE_FUNCTION(Window::name_setter)
     return JS::js_undefined();
 }
 
-JS_DEFINE_NATIVE_FUNCTION(Window::navigator_getter)
-{
-    auto* impl = TRY(impl_from(vm));
-    return impl->m_navigator;
-}
-
 }
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index b88dad92e6..78fafdcaa4 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -140,6 +140,8 @@ public:
     Vector<JS::NonnullGCPtr<MimeType>> pdf_viewer_mime_type_objects();
 
     // JS API functions
+    JS::NonnullGCPtr<Navigator> navigator() const;
+
     void alert(String const& message = {});
     bool confirm(Optional<String> const& message);
     Optional<String> prompt(Optional<String> const& message, Optional<String> const& default_);
@@ -288,8 +290,6 @@ private:
 
     JS_DECLARE_NATIVE_FUNCTION(crypto_getter);
 
-    JS_DECLARE_NATIVE_FUNCTION(navigator_getter);
-
     HTML::Location* m_location { nullptr };
 
     // [[CrossOriginPropertyDescriptorMap]], https://html.spec.whatwg.org/multipage/browsers.html#crossoriginpropertydescriptormap
diff --git a/Userland/Libraries/LibWeb/HTML/Window.idl b/Userland/Libraries/LibWeb/HTML/Window.idl
index 36989d9565..c8cade2f95 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.idl
+++ b/Userland/Libraries/LibWeb/HTML/Window.idl
@@ -1,9 +1,14 @@
 #import <DOM/EventHandler.idl>
 #import <DOM/EventTarget.idl>
+#import <HTML/Navigator.idl>
 
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#window
 [Global=Window, Exposed=Window, LegacyUnenumerableNamedProperties, UseNewAKString]
 interface Window : EventTarget {
+    // the user agent
+    readonly attribute Navigator navigator;
+    [ImplementedAs=navigator] readonly attribute Navigator clientInformation; // legacy alias of .navigator
+
     // user prompts
     undefined alert();
     undefined alert(DOMString message);