diff --git a/Libraries/LibWeb/Internals/Internals.cpp b/Libraries/LibWeb/Internals/Internals.cpp
index 0d4bd0269b2..fb2914923c5 100644
--- a/Libraries/LibWeb/Internals/Internals.cpp
+++ b/Libraries/LibWeb/Internals/Internals.cpp
@@ -124,6 +124,18 @@ void Internals::click(double x, double y, UIEvents::MouseButton button)
     page.handle_mouseup(position, position, button, 0, 0);
 }
 
+void Internals::mouse_down(double x, double y)
+{
+    mouse_down(x, y, UIEvents::MouseButton::Primary);
+}
+
+void Internals::mouse_down(double x, double y, UIEvents::MouseButton button)
+{
+    auto& page = internals_page();
+    auto position = page.css_to_device_point({ x, y });
+    page.handle_mousedown(position, position, button, 0, 0);
+}
+
 void Internals::move_pointer_to(double x, double y)
 {
     auto& page = internals_page();
diff --git a/Libraries/LibWeb/Internals/Internals.h b/Libraries/LibWeb/Internals/Internals.h
index 0b2770b3946..56dc5e2a015 100644
--- a/Libraries/LibWeb/Internals/Internals.h
+++ b/Libraries/LibWeb/Internals/Internals.h
@@ -32,6 +32,7 @@ public:
     void click(double x, double y);
     void doubleclick(double x, double y);
     void middle_click(double x, double y);
+    void mouse_down(double x, double y);
     void move_pointer_to(double x, double y);
     void wheel(double x, double y, double delta_x, double delta_y);
 
@@ -59,6 +60,7 @@ private:
     virtual void initialize(JS::Realm&) override;
 
     void click(double x, double y, UIEvents::MouseButton);
+    void mouse_down(double x, double y, UIEvents::MouseButton);
 
     HTML::Window& internals_window() const;
     Page& internals_page() const;
diff --git a/Libraries/LibWeb/Internals/Internals.idl b/Libraries/LibWeb/Internals/Internals.idl
index c39a71c7b61..64a2994a655 100644
--- a/Libraries/LibWeb/Internals/Internals.idl
+++ b/Libraries/LibWeb/Internals/Internals.idl
@@ -23,6 +23,7 @@ interface Internals {
     undefined click(double x, double y);
     undefined doubleclick(double x, double y);
     undefined middleClick(double x, double y);
+    undefined mouseDown(double x, double y);
     undefined movePointerTo(double x, double y);
     undefined wheel(double x, double y, double deltaX, double deltaY);