diff --git a/Userland/Libraries/LibWeb/HTML/Storage.cpp b/Userland/Libraries/LibWeb/HTML/Storage.cpp
index 456c8349e4..4f4435455b 100644
--- a/Userland/Libraries/LibWeb/HTML/Storage.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Storage.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -16,7 +17,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<Storage>> Storage::create(JS::Realm& realm)
 }
 
 Storage::Storage(JS::Realm& realm)
-    : PlatformObject(realm)
+    : Bindings::LegacyPlatformObject(realm)
 {
 }
 
@@ -154,6 +155,28 @@ Vector<DeprecatedString> Storage::supported_property_names() const
     return m_map.keys();
 }
 
+WebIDL::ExceptionOr<JS::Value> Storage::named_item_value(DeprecatedFlyString const& name) const
+{
+    auto value = get_item(name);
+    if (value.is_null())
+        return JS::js_null();
+    return JS::PrimitiveString::create(vm(), value);
+}
+
+WebIDL::ExceptionOr<Bindings::LegacyPlatformObject::DidDeletionFail> Storage::delete_value(DeprecatedString const& name)
+{
+    remove_item(name);
+    return DidDeletionFail::NotRelevant;
+}
+
+WebIDL::ExceptionOr<void> Storage::set_value_of_named_property(DeprecatedString const& key, JS::Value unconverted_value)
+{
+    // NOTE: Since LegacyPlatformObject does not know the type of value, we must convert it ourselves.
+    //       The type of `value` is `DOMString`.
+    auto value = TRY(unconverted_value.to_deprecated_string(vm()));
+    return set_item(key, value);
+}
+
 void Storage::dump() const
 {
     dbgln("Storage ({} key(s))", m_map.size());
diff --git a/Userland/Libraries/LibWeb/HTML/Storage.h b/Userland/Libraries/LibWeb/HTML/Storage.h
index 4a12ab704d..f297962571 100644
--- a/Userland/Libraries/LibWeb/HTML/Storage.h
+++ b/Userland/Libraries/LibWeb/HTML/Storage.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -7,13 +8,13 @@
 #pragma once
 
 #include <AK/HashMap.h>
-#include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/Bindings/LegacyPlatformObject.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::HTML {
 
-class Storage : public Bindings::PlatformObject {
-    WEB_PLATFORM_OBJECT(Storage, Bindings::PlatformObject);
+class Storage : public Bindings::LegacyPlatformObject {
+    WEB_PLATFORM_OBJECT(Storage, Bindings::LegacyPlatformObject);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Storage>> create(JS::Realm&);
@@ -26,8 +27,6 @@ public:
     void remove_item(DeprecatedString const& key);
     void clear();
 
-    Vector<DeprecatedString> supported_property_names() const;
-
     auto const& map() const { return m_map; }
 
     void dump() const;
@@ -37,6 +36,24 @@ private:
 
     virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
 
+    // ^LegacyPlatformObject
+    virtual WebIDL::ExceptionOr<JS::Value> named_item_value(DeprecatedFlyString const&) const override;
+    virtual WebIDL::ExceptionOr<DidDeletionFail> delete_value(DeprecatedString const&) override;
+    virtual Vector<DeprecatedString> supported_property_names() const override;
+    virtual WebIDL::ExceptionOr<void> set_value_of_named_property(DeprecatedString const& key, JS::Value value) override;
+
+    virtual bool supports_indexed_properties() const override { return false; }
+    virtual bool supports_named_properties() const override { return true; }
+    virtual bool has_indexed_property_setter() const override { return false; }
+    virtual bool has_named_property_setter() const override { return true; }
+    virtual bool has_named_property_deleter() const override { return true; }
+    virtual bool has_legacy_override_built_ins_interface_extended_attribute() const override { return true; }
+    virtual bool has_legacy_unenumerable_named_properties_interface_extended_attribute() const override { return false; }
+    virtual bool has_global_interface_extended_attribute() const override { return false; }
+    virtual bool indexed_property_setter_has_identifier() const override { return false; }
+    virtual bool named_property_setter_has_identifier() const override { return true; }
+    virtual bool named_property_deleter_has_identifier() const override { return true; }
+
     void reorder();
     void broadcast(DeprecatedString const& key, DeprecatedString const& old_value, DeprecatedString const& new_value);