diff --git a/Userland/Libraries/LibWeb/DOM/Event.cpp b/Userland/Libraries/LibWeb/DOM/Event.cpp
index 796e2a7efd..554e7cb1c5 100644
--- a/Userland/Libraries/LibWeb/DOM/Event.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Event.cpp
@@ -83,7 +83,7 @@ void Event::append_to_path(EventTarget& invocation_target, JS::GCPtr<EventTarget
         if (is<ShadowRoot>(invocation_target_node)) {
             auto& invocation_target_shadow_root = verify_cast<ShadowRoot>(invocation_target_node);
             // 4. If invocationTarget is a shadow root whose mode is "closed", then set root-of-closed-tree to true.
-            root_of_closed_tree = invocation_target_shadow_root.closed();
+            root_of_closed_tree = invocation_target_shadow_root.mode() == Bindings::ShadowRootMode::Closed;
         }
     }
 
diff --git a/Userland/Libraries/LibWeb/DOM/ShadowRoot.h b/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
index adb68d8ebd..b4d33a8df4 100644
--- a/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
+++ b/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <LibWeb/Bindings/ShadowRootPrototype.h>
 #include <LibWeb/DOM/DocumentFragment.h>
 
 namespace Web::DOM {
@@ -14,7 +15,7 @@ class ShadowRoot final : public DocumentFragment {
     WEB_PLATFORM_OBJECT(ShadowRoot, DocumentFragment);
 
 public:
-    bool closed() const { return m_closed; }
+    Bindings::ShadowRootMode mode() const { return m_mode; }
 
     bool delegates_focus() const { return m_delegates_focus; }
     void set_delegates_focus(bool delegates_focus) { m_delegates_focus = delegates_focus; }
@@ -25,9 +26,6 @@ public:
     // ^EventTarget
     virtual EventTarget* get_parent(Event const&) override;
 
-    // NOTE: This is intended for the JS bindings.
-    DeprecatedString mode() const { return m_closed ? "closed" : "open"; }
-
     WebIDL::ExceptionOr<DeprecatedString> inner_html() const;
     WebIDL::ExceptionOr<void> set_inner_html(DeprecatedString const&);
 
@@ -39,8 +37,8 @@ private:
     virtual DeprecatedFlyString node_name() const override { return "#shadow-root"; }
     virtual bool is_shadow_root() const final { return true; }
 
-    // NOTE: The specification doesn't seem to specify a default value for closed. Assuming false for now.
-    bool m_closed { false };
+    // NOTE: The specification doesn't seem to specify a default value for closed. Assuming closed for now.
+    Bindings::ShadowRootMode m_mode { Bindings::ShadowRootMode::Closed };
     bool m_delegates_focus { false };
     bool m_available_to_element_internals { false };
 };
diff --git a/Userland/Libraries/LibWeb/DOM/ShadowRoot.idl b/Userland/Libraries/LibWeb/DOM/ShadowRoot.idl
index c5474d5903..3403c58bc2 100644
--- a/Userland/Libraries/LibWeb/DOM/ShadowRoot.idl
+++ b/Userland/Libraries/LibWeb/DOM/ShadowRoot.idl
@@ -4,8 +4,7 @@
 // https://dom.spec.whatwg.org/#shadowroot
 [Exposed=Window]
 interface ShadowRoot : DocumentFragment {
-    // FIXME: mode should return a ShadowRootMode
-    readonly attribute DOMString mode;
+    readonly attribute ShadowRootMode mode;
     // FIXME: readonly attribute boolean delegatesFocus;
     // FIXME: readonly attribute SlotAssignmentMode slotAssignment;
     readonly attribute Element host;