diff --git a/Libraries/LibHTML/DOM/Node.h b/Libraries/LibHTML/DOM/Node.h
index a49220d84c7..2e53fe937ae 100644
--- a/Libraries/LibHTML/DOM/Node.h
+++ b/Libraries/LibHTML/DOM/Node.h
@@ -55,6 +55,9 @@ public:
         return nullptr;
     }
 
+    virtual void inserted_into(Node&) {}
+    virtual void removed_from(Node&) {}
+
 protected:
     Node(Document&, NodeType);
 
diff --git a/Libraries/LibHTML/Layout/LayoutNode.h b/Libraries/LibHTML/Layout/LayoutNode.h
index 04e0205be22..ed31dd424dc 100644
--- a/Libraries/LibHTML/Layout/LayoutNode.h
+++ b/Libraries/LibHTML/Layout/LayoutNode.h
@@ -64,6 +64,9 @@ public:
 
     const StyleProperties& style_properties() const { return m_style_properties; }
 
+    void inserted_into(LayoutNode&) {}
+    void removed_from(LayoutNode&) {}
+
 protected:
     explicit LayoutNode(const Node*, StyleProperties&&);
 
diff --git a/Libraries/LibHTML/Parser/HTMLParser.cpp b/Libraries/LibHTML/Parser/HTMLParser.cpp
index 940726c5653..b8d5d2ed6f6 100644
--- a/Libraries/LibHTML/Parser/HTMLParser.cpp
+++ b/Libraries/LibHTML/Parser/HTMLParser.cpp
@@ -1,3 +1,4 @@
+#include <AK/Function.h>
 #include <AK/NonnullRefPtrVector.h>
 #include <AK/StringBuilder.h>
 #include <LibHTML/DOM/Element.h>
@@ -99,7 +100,7 @@ NonnullRefPtr<Document> parse_html(const String& html)
             attribute_value_buffer.clear();
         if (state == State::Free && !text_buffer.string_view().is_empty()) {
             auto text_node = adopt(*new Text(document, text_buffer.to_string()));
-            node_stack.last().append_child(text_node);
+            node_stack.last().append_child(text_node, false);
         }
         state = new_state;
         text_buffer.clear();
@@ -116,7 +117,7 @@ NonnullRefPtr<Document> parse_html(const String& html)
         new_element->set_attributes(move(attributes));
         node_stack.append(new_element);
         if (node_stack.size() != 1)
-            node_stack[node_stack.size() - 2].append_child(new_element);
+            node_stack[node_stack.size() - 2].append_child(new_element, false);
 
         if (is_self_closing_tag(new_element->tag_name()))
             close_tag();
@@ -278,5 +279,16 @@ NonnullRefPtr<Document> parse_html(const String& html)
             ASSERT_NOT_REACHED();
         }
     }
+
+    Function<void(Node&)> fire_insertion_callbacks = [&](Node& node) {
+        for (auto* child = node.first_child(); child; child = child->next_sibling()) {
+            fire_insertion_callbacks(*child);
+        }
+        if (node.parent())
+            node.inserted_into(*node.parent());
+    };
+
+    fire_insertion_callbacks(*document);
+
     return document;
 }
diff --git a/Libraries/LibHTML/TreeNode.h b/Libraries/LibHTML/TreeNode.h
index a4da2f1f9ba..36459c5c775 100644
--- a/Libraries/LibHTML/TreeNode.h
+++ b/Libraries/LibHTML/TreeNode.h
@@ -33,7 +33,7 @@ public:
     const T* first_child() const { return m_first_child; }
     const T* last_child() const { return m_last_child; }
 
-    void append_child(NonnullRefPtr<T> node);
+    void append_child(NonnullRefPtr<T> node, bool call_inserted_into = true);
     void donate_all_children_to(T& node);
 
 protected:
@@ -49,16 +49,19 @@ private:
 };
 
 template<typename T>
-inline void TreeNode<T>::append_child(NonnullRefPtr<T> node)
+inline void TreeNode<T>::append_child(NonnullRefPtr<T> node, bool call_inserted_into)
 {
     ASSERT(!node->m_parent);
     if (m_last_child)
         m_last_child->m_next_sibling = node.ptr();
     node->m_previous_sibling = m_last_child;
     node->m_parent = static_cast<T*>(this);
-    m_last_child = &node.leak_ref();
+    m_last_child = node.ptr();
     if (!m_first_child)
         m_first_child = m_last_child;
+    if (call_inserted_into)
+        node->inserted_into(static_cast<T&>(*this));
+    (void)node.leak_ref();
 }
 
 template<typename T>