diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
index 803b9157db..c18dd7bc97 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
@@ -55,6 +55,7 @@ protected:
     virtual void initialize(JS::Realm&) override;
 
     JS::NonnullGCPtr<ParentNode> root() { return *m_root; }
+    JS::NonnullGCPtr<ParentNode const> root() const { return *m_root; }
 
 private:
     virtual void visit_edges(Cell::Visitor&) override;
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
index 47642e6f09..42e4f2cf8e 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
@@ -33,7 +33,7 @@ void HTMLFormControlsCollection::initialize(JS::Realm& realm)
 }
 
 // https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#dom-htmlformcontrolscollection-nameditem
-Variant<Empty, Element*, JS::Handle<RadioNodeList>> HTMLFormControlsCollection::named_item_or_radio_node_list(FlyString const& name)
+Variant<Empty, Element*, JS::Handle<RadioNodeList>> HTMLFormControlsCollection::named_item_or_radio_node_list(FlyString const& name) const
 {
     // 1. If name is the empty string, return null and stop the algorithm.
     if (name.is_empty())
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
index aa20f0c540..aba67236f7 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
+++ b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
@@ -20,7 +20,7 @@ public:
 
     virtual ~HTMLFormControlsCollection() override;
 
-    Variant<Empty, Element*, JS::Handle<RadioNodeList>> named_item_or_radio_node_list(FlyString const& name);
+    Variant<Empty, Element*, JS::Handle<RadioNodeList>> named_item_or_radio_node_list(FlyString const& name) const;
 
 protected:
     virtual void initialize(JS::Realm&) override;
diff --git a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
index 10b6169ab6..c03ba4ec18 100644
--- a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
@@ -14,12 +14,12 @@ namespace Web::DOM {
 
 JS_DEFINE_ALLOCATOR(LiveNodeList);
 
-JS::NonnullGCPtr<NodeList> LiveNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+JS::NonnullGCPtr<NodeList> LiveNodeList::create(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter)
 {
     return realm.heap().allocate<LiveNodeList>(realm, realm, root, scope, move(filter));
 }
 
-LiveNodeList::LiveNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+LiveNodeList::LiveNodeList(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter)
     : NodeList(realm)
     , m_root(root)
     , m_filter(move(filter))
diff --git a/Userland/Libraries/LibWeb/DOM/LiveNodeList.h b/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
index 99de8533f4..4084c16a5e 100644
--- a/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
+++ b/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
@@ -24,7 +24,7 @@ public:
         Descendants,
     };
 
-    [[nodiscard]] static JS::NonnullGCPtr<NodeList> create(JS::Realm&, Node& root, Scope, Function<bool(Node const&)> filter);
+    [[nodiscard]] static JS::NonnullGCPtr<NodeList> create(JS::Realm&, Node const& root, Scope, Function<bool(Node const&)> filter);
     virtual ~LiveNodeList() override;
 
     virtual u32 length() const override;
@@ -33,7 +33,7 @@ public:
     virtual bool is_supported_property_index(u32) const override;
 
 protected:
-    LiveNodeList(JS::Realm&, Node& root, Scope, Function<bool(Node const&)> filter);
+    LiveNodeList(JS::Realm&, Node const& root, Scope, Function<bool(Node const&)> filter);
 
     Node* first_matching(Function<bool(Node const&)> const& filter) const;
 
@@ -42,7 +42,7 @@ private:
 
     JS::MarkedVector<Node*> collection() const;
 
-    JS::NonnullGCPtr<Node> m_root;
+    JS::NonnullGCPtr<Node const> m_root;
     Function<bool(Node const&)> m_filter;
     Scope m_scope { Scope::Descendants };
 };
diff --git a/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp b/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
index 56e29f996d..24b563dab5 100644
--- a/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
@@ -14,12 +14,12 @@ namespace Web::DOM {
 
 JS_DEFINE_ALLOCATOR(RadioNodeList);
 
-JS::NonnullGCPtr<RadioNodeList> RadioNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+JS::NonnullGCPtr<RadioNodeList> RadioNodeList::create(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter)
 {
     return realm.heap().allocate<RadioNodeList>(realm, realm, root, scope, move(filter));
 }
 
-RadioNodeList::RadioNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+RadioNodeList::RadioNodeList(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter)
     : LiveNodeList(realm, root, scope, move(filter))
 {
 }
diff --git a/Userland/Libraries/LibWeb/DOM/RadioNodeList.h b/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
index bcf1991b5f..ab7ecf548b 100644
--- a/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
+++ b/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
@@ -16,7 +16,7 @@ class RadioNodeList : public LiveNodeList {
     JS_DECLARE_ALLOCATOR(RadioNodeList);
 
 public:
-    [[nodiscard]] static JS::NonnullGCPtr<RadioNodeList> create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter);
+    [[nodiscard]] static JS::NonnullGCPtr<RadioNodeList> create(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter);
 
     virtual ~RadioNodeList() override;
 
@@ -27,7 +27,7 @@ protected:
     virtual void initialize(JS::Realm&) override;
 
 private:
-    explicit RadioNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter);
+    explicit RadioNodeList(JS::Realm& realm, Node const& root, Scope scope, Function<bool(Node const&)> filter);
 };
 
 }