diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index e581ea0700e..d60baa5bd1f 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -1057,7 +1057,6 @@ WebIDL::ExceptionOr<void> Window::initialize_web_interfaces(Badge<WindowEnvironm
     define_native_accessor(realm, "innerHeight", inner_height_getter, {}, JS::Attribute::Enumerable);
     define_native_accessor(realm, "devicePixelRatio", device_pixel_ratio_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
     u8 attr = JS::Attribute::Writable | JS::Attribute::Enumerable | JS::Attribute::Configurable;
-    define_native_function(realm, "open", open, 0, attr);
     define_native_function(realm, "setInterval", set_interval, 1, attr);
     define_native_function(realm, "setTimeout", set_timeout, 1, attr);
     define_native_function(realm, "clearInterval", clear_interval, 1, attr);
@@ -1280,6 +1279,13 @@ JS::GCPtr<DOM::Element const> Window::frame_element() const
     return container;
 }
 
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-open
+WebIDL::ExceptionOr<JS::GCPtr<HTML::WindowProxy>> Window::open(Optional<String> const& url, Optional<String> const& target, Optional<String> const& features)
+{
+    // The open(url, target, features) method steps are to run the window open steps with url, target, and features.
+    return open_impl(*url, *target, *features);
+}
+
 // https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator
 JS::NonnullGCPtr<Navigator> Window::navigator() const
 {
@@ -1335,28 +1341,6 @@ void Window::post_message(JS::Value message, String const&)
     });
 }
 
-JS_DEFINE_NATIVE_FUNCTION(Window::open)
-{
-    auto* impl = TRY(impl_from(vm));
-
-    // optional USVString url = ""
-    DeprecatedString url = "";
-    if (!vm.argument(0).is_undefined())
-        url = TRY(vm.argument(0).to_deprecated_string(vm));
-
-    // optional DOMString target = "_blank"
-    DeprecatedString target = "_blank";
-    if (!vm.argument(1).is_undefined())
-        target = TRY(vm.argument(1).to_deprecated_string(vm));
-
-    // optional [LegacyNullToEmptyString] DOMString features = "")
-    DeprecatedString features = "";
-    if (!vm.argument(2).is_nullish())
-        features = TRY(vm.argument(2).to_deprecated_string(vm));
-
-    return TRY(Bindings::throw_dom_exception_if_needed(vm, [&] { return impl->open_impl(url, target, features); }));
-}
-
 static JS::ThrowCompletionOr<TimerHandler> make_timer_handler(JS::VM& vm, JS::Value handler)
 {
     if (handler.is_function())
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index c338175bd0a..20c059cc220 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -147,6 +147,7 @@ public:
     JS::GCPtr<WindowProxy const> top() const;
     JS::GCPtr<WindowProxy const> parent() const;
     JS::GCPtr<DOM::Element const> frame_element() const;
+    WebIDL::ExceptionOr<JS::GCPtr<HTML::WindowProxy>> open(Optional<String> const& url, Optional<String> const& target, Optional<String> const& features);
 
     JS::NonnullGCPtr<Navigator> navigator() const;
 
@@ -254,7 +255,6 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(origin_getter);
     JS_DECLARE_NATIVE_FUNCTION(is_secure_context_getter);
 
-    JS_DECLARE_NATIVE_FUNCTION(open);
     JS_DECLARE_NATIVE_FUNCTION(set_interval);
     JS_DECLARE_NATIVE_FUNCTION(set_timeout);
     JS_DECLARE_NATIVE_FUNCTION(clear_interval);
diff --git a/Userland/Libraries/LibWeb/HTML/Window.idl b/Userland/Libraries/LibWeb/HTML/Window.idl
index f05044c0d6d..2adcf89de90 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.idl
+++ b/Userland/Libraries/LibWeb/HTML/Window.idl
@@ -20,6 +20,7 @@ interface Window : EventTarget {
     [LegacyUnforgeable] readonly attribute WindowProxy? top;
     [Replaceable] readonly attribute WindowProxy? parent;
     readonly attribute Element? frameElement;
+    WindowProxy? open(optional USVString url = "", optional DOMString target = "_blank", optional [LegacyNullToEmptyString] DOMString features = "");
 
     // the user agent
     readonly attribute Navigator navigator;