diff --git a/Libraries/LibWeb/DOM/Element.h b/Libraries/LibWeb/DOM/Element.h
index 76a29fc30d7..ddefb2ab93f 100644
--- a/Libraries/LibWeb/DOM/Element.h
+++ b/Libraries/LibWeb/DOM/Element.h
@@ -116,3 +116,12 @@ private:
 };
 
 }
+
+namespace AK {
+template<>
+inline bool is<Web::DOM::Element>(const Web::DOM::Node& input)
+{
+    return input.is_element();
+}
+
+}
diff --git a/Libraries/LibWeb/Layout/Box.h b/Libraries/LibWeb/Layout/Box.h
index b43f969fad3..7b05b381e34 100644
--- a/Libraries/LibWeb/Layout/Box.h
+++ b/Libraries/LibWeb/Layout/Box.h
@@ -123,6 +123,8 @@ protected:
     Vector<LineBox> m_line_boxes;
 
 private:
+    virtual bool is_box() const final { return true; }
+
     Gfx::FloatPoint m_offset;
     Gfx::FloatSize m_size;
 
@@ -133,3 +135,12 @@ private:
 };
 
 }
+
+namespace AK {
+template<>
+inline bool is<Web::Layout::Box>(const Web::Layout::Node& input)
+{
+    return input.is_box();
+}
+
+}
diff --git a/Libraries/LibWeb/Layout/Node.h b/Libraries/LibWeb/Layout/Node.h
index de7ed3e7bf1..c1699924e39 100644
--- a/Libraries/LibWeb/Layout/Node.h
+++ b/Libraries/LibWeb/Layout/Node.h
@@ -115,6 +115,8 @@ public:
     virtual void paint_fragment(PaintContext&, const LineBoxFragment&, PaintPhase) const { }
     virtual void after_children_paint(PaintContext&, PaintPhase) {};
 
+    virtual bool is_box() const { return false; }
+
     bool is_floating() const;
     bool is_positioned() const;
     bool is_absolutely_positioned() const;