diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
index 86a036be79c..396960095e1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
@@ -175,4 +175,13 @@ Optional<ARIA::Role> HTMLSelectElement::default_role() const
     return ARIA::Role::combobox;
 }
 
+void HTMLSelectElement::set_is_open(bool open)
+{
+    if (open == m_is_open)
+        return;
+
+    m_is_open = open;
+    invalidate_style();
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
index 02f5a9d8544..e670bfe241a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
@@ -33,6 +33,9 @@ public:
     int selected_index() const;
     void set_selected_index(int);
 
+    bool is_open() const { return m_is_open; }
+    void set_is_open(bool);
+
     Vector<JS::Handle<HTMLOptionElement>> list_of_options() const;
 
     // ^EventTarget
@@ -72,6 +75,7 @@ private:
     virtual i32 default_tab_index_value() const override;
 
     JS::GCPtr<HTMLOptionsCollection> m_options;
+    bool m_is_open { false };
 };
 
 }