LibWeb: Implement window.location.port

This returns the port of the current document's URL. :^)

Userland/Libraries/LibWeb/Bindings/LocationObject.cpp

@@ -29,6 +29,7 @@ void LocationObject::initialize(JS::GlobalObject& global_object)
     define_native_accessor("hash", hash_getter, {}, attr);
     define_native_accessor("search", search_getter, {}, attr);
     define_native_accessor("protocol", protocol_getter, {}, attr);
+    define_native_accessor("port", port_getter, {}, attr);
 
     define_native_function("reload", reload, 0, JS::Attribute::Enumerable);
 }
@@ -110,6 +111,12 @@ JS_DEFINE_NATIVE_FUNCTION(LocationObject::protocol_getter)
     return JS::js_string(vm, builder.to_string());
 }
 
+JS_DEFINE_NATIVE_FUNCTION(LocationObject::port_getter)
+{
+    auto& window = static_cast<WindowObject&>(global_object);
+    return JS::Value(window.impl().associated_document().url().port_or_default());
+}
+
 JS_DEFINE_NATIVE_FUNCTION(LocationObject::reload)
 {
     auto& window = static_cast<WindowObject&>(global_object);

Userland/Libraries/LibWeb/Bindings/LocationObject.h

@@ -39,6 +39,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(hash_getter);
     JS_DECLARE_NATIVE_FUNCTION(search_getter);
     JS_DECLARE_NATIVE_FUNCTION(protocol_getter);
+    JS_DECLARE_NATIVE_FUNCTION(port_getter);
 };
 
 }