diff --git a/Libraries/LibWeb/DOM/Node.h b/Libraries/LibWeb/DOM/Node.h
index efa58b96726..1732b1cb48b 100644
--- a/Libraries/LibWeb/DOM/Node.h
+++ b/Libraries/LibWeb/DOM/Node.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
+ * Copyright (c) 2018-2025, Andreas Kling <andreas@ladybird.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -144,6 +144,8 @@ public:
     virtual bool is_svg_style_element() const { return false; }
     virtual bool is_svg_svg_element() const { return false; }
     virtual bool is_svg_use_element() const { return false; }
+    virtual bool is_svg_a_element() const { return false; }
+    virtual bool is_svg_foreign_object_element() const { return false; }
 
     bool in_a_document_tree() const;
 
@@ -158,10 +160,13 @@ public:
     virtual bool is_html_element() const { return false; }
     virtual bool is_html_html_element() const { return false; }
     virtual bool is_html_anchor_element() const { return false; }
+    virtual bool is_html_area_element() const { return false; }
     virtual bool is_html_base_element() const { return false; }
     virtual bool is_html_body_element() const { return false; }
+    virtual bool is_html_head_element() const { return false; }
     virtual bool is_html_input_element() const { return false; }
     virtual bool is_html_link_element() const { return false; }
+    virtual bool is_html_media_element() const { return false; }
     virtual bool is_html_progress_element() const { return false; }
     virtual bool is_html_script_element() const { return false; }
     virtual bool is_html_style_element() const { return false; }
@@ -170,6 +175,7 @@ public:
     virtual bool is_html_table_section_element() const { return false; }
     virtual bool is_html_table_row_element() const { return false; }
     virtual bool is_html_table_cell_element() const { return false; }
+    virtual bool is_html_title_element() const { return false; }
     virtual bool is_html_br_element() const { return false; }
     virtual bool is_html_button_element() const { return false; }
     virtual bool is_html_slot_element() const { return false; }
@@ -178,6 +184,8 @@ public:
     virtual bool is_html_form_element() const { return false; }
     virtual bool is_html_image_element() const { return false; }
     virtual bool is_html_iframe_element() const { return false; }
+    virtual bool is_html_frameset_element() const { return false; }
+    virtual bool is_html_fieldset_element() const { return false; }
     virtual bool is_navigable_container() const { return false; }
     virtual bool is_lazy_loading() const { return false; }
 
diff --git a/Libraries/LibWeb/HTML/HTMLAreaElement.h b/Libraries/LibWeb/HTML/HTMLAreaElement.h
index 0ac96cb03a9..663d4331ca5 100644
--- a/Libraries/LibWeb/HTML/HTMLAreaElement.h
+++ b/Libraries/LibWeb/HTML/HTMLAreaElement.h
@@ -25,6 +25,8 @@ public:
 private:
     HTMLAreaElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual bool is_html_area_element() const override { return true; }
+
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
@@ -59,3 +61,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLAreaElement>() const { return is_html_area_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLFieldSetElement.h b/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
index fa60703acf7..c6bafcb85cb 100644
--- a/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
+++ b/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
@@ -54,7 +54,14 @@ private:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
+    virtual bool is_html_fieldset_element() const override { return true; }
+
     GC::Ptr<DOM::HTMLCollection> m_elements;
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLFieldSetElement>() const { return is_html_fieldset_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLFrameSetElement.h b/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
index 62a4ef04305..14ae65f7197 100644
--- a/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
+++ b/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
@@ -24,6 +24,8 @@ public:
 private:
     HTMLFrameSetElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual bool is_html_frameset_element() const override { return true; }
+
     virtual void adjust_computed_style(CSS::ComputedProperties&) override;
 
     virtual void initialize(JS::Realm&) override;
@@ -37,3 +39,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLFrameSetElement>() const { return is_html_frameset_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLHeadElement.h b/Libraries/LibWeb/HTML/HTMLHeadElement.h
index 9105033394b..632b441b009 100644
--- a/Libraries/LibWeb/HTML/HTMLHeadElement.h
+++ b/Libraries/LibWeb/HTML/HTMLHeadElement.h
@@ -20,7 +20,13 @@ public:
 private:
     HTMLHeadElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual bool is_html_head_element() const final { return true; }
     virtual void initialize(JS::Realm&) override;
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLHeadElement>() const { return is_html_head_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLIFrameElement.h b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
index 0bf82bd79be..39b13c86d4b 100644
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
@@ -69,3 +69,8 @@ private:
 void run_iframe_load_event_steps(HTML::HTMLIFrameElement&);
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLIFrameElement>() const { return is_html_iframe_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLMediaElement.h b/Libraries/LibWeb/HTML/HTMLMediaElement.h
index 99fbbb170ab..38dc0c444af 100644
--- a/Libraries/LibWeb/HTML/HTMLMediaElement.h
+++ b/Libraries/LibWeb/HTML/HTMLMediaElement.h
@@ -182,6 +182,8 @@ protected:
 private:
     friend SourceElementSelector;
 
+    virtual bool is_html_media_element() const final { return true; }
+
     struct EntireResource { };
     using ByteRange = Variant<EntireResource>; // FIXME: This will need to include "until end" and an actual byte range.
 
@@ -324,3 +326,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLMediaElement>() const { return is_html_media_element(); }
+}
diff --git a/Libraries/LibWeb/HTML/HTMLTitleElement.h b/Libraries/LibWeb/HTML/HTMLTitleElement.h
index b99cd99aae2..ea918412e84 100644
--- a/Libraries/LibWeb/HTML/HTMLTitleElement.h
+++ b/Libraries/LibWeb/HTML/HTMLTitleElement.h
@@ -23,8 +23,14 @@ public:
 private:
     HTMLTitleElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual bool is_html_title_element() const override { return true; }
     virtual void initialize(JS::Realm&) override;
     virtual void children_changed(ChildrenChangedMetadata const*) override;
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLTitleElement>() const { return is_html_title_element(); }
+}
diff --git a/Libraries/LibWeb/SVG/SVGAElement.h b/Libraries/LibWeb/SVG/SVGAElement.h
index b33e887f643..425f6d6fe27 100644
--- a/Libraries/LibWeb/SVG/SVGAElement.h
+++ b/Libraries/LibWeb/SVG/SVGAElement.h
@@ -31,6 +31,8 @@ private:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
+    virtual bool is_svg_a_element() const override { return true; }
+
     // ^DOM::Element
     virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
     virtual i32 default_tab_index_value() const override;
@@ -39,3 +41,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<SVG::SVGAElement>() const { return is_svg_a_element(); }
+}
diff --git a/Libraries/LibWeb/SVG/SVGForeignObjectElement.h b/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
index c0330dd7415..ce441f287b9 100644
--- a/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
+++ b/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
@@ -28,6 +28,8 @@ public:
 private:
     SVGForeignObjectElement(DOM::Document& document, DOM::QualifiedName qualified_name);
 
+    virtual bool is_svg_foreign_object_element() const override { return true; }
+
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
@@ -41,3 +43,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<SVG::SVGForeignObjectElement>() const { return is_svg_foreign_object_element(); }
+}