diff --git a/Libraries/LibDevTools/Actors/WalkerActor.cpp b/Libraries/LibDevTools/Actors/WalkerActor.cpp
index 234ad13070c..2fd245f076d 100644
--- a/Libraries/LibDevTools/Actors/WalkerActor.cpp
+++ b/Libraries/LibDevTools/Actors/WalkerActor.cpp
@@ -134,6 +134,47 @@ void WalkerActor::handle_message(StringView type, JsonObject const& message)
         return;
     }
 
+    if (type == "insertAdjacentHTML") {
+        // FIXME: This message also contains `value` and `position` parameters, containing the HTML to insert and the
+        //        location to insert it. For the "Create New Node" action, this is always "<div></div>" and "beforeEnd",
+        //        which is exactly what our WebView implementation currently supports.
+        auto node = message.get_string("node"sv);
+        if (!node.has_value()) {
+            send_missing_parameter_error("node"sv);
+            return;
+        }
+
+        if (auto dom_node = WalkerActor::dom_node_for(*this, *node); dom_node.has_value()) {
+            auto block_token = block_responses();
+
+            devtools().delegate().create_child_element(
+                dom_node->tab->description(), dom_node->identifier.id,
+                [weak_self = make_weak_ptr<WalkerActor>(), block_token = move(block_token)](ErrorOr<Web::UniqueNodeID> node_id) mutable {
+                    if (node_id.is_error()) {
+                        dbgln_if(DEVTOOLS_DEBUG, "Unable to edit DOM node: {}", node_id.error());
+                        return;
+                    }
+
+                    if (auto self = weak_self.strong_ref()) {
+                        JsonArray nodes;
+
+                        if (auto actor = self->m_dom_node_id_to_actor_map.get(node_id.value()); actor.has_value()) {
+                            if (auto dom_node = WalkerActor::dom_node_for(self, *actor); dom_node.has_value())
+                                nodes.must_append(self->serialize_node(dom_node->node));
+                        }
+
+                        JsonObject message;
+                        message.set("from"sv, self->name());
+                        message.set("newParents"sv, JsonArray {});
+                        message.set("nodes"sv, move(nodes));
+                        self->send_message(move(message), move(block_token));
+                    }
+                });
+        }
+
+        return;
+    }
+
     if (type == "isInDOMTree"sv) {
         auto node = message.get_string("node"sv);
         if (!node.has_value()) {
@@ -346,7 +387,7 @@ JsonValue WalkerActor::serialize_node(JsonObject const& node) const
     serialized.set("containerType"sv, JsonValue {});
     serialized.set("displayName"sv, name.to_ascii_lowercase());
     serialized.set("displayType"sv, "block"sv);
-    serialized.set("host"sv, JsonValue {});
+    serialized.set("hasEventListeners"sv, false);
     serialized.set("isAfterPseudoElement"sv, false);
     serialized.set("isAnonymous"sv, false);
     serialized.set("isBeforePseudoElement"sv, false);
@@ -366,6 +407,9 @@ JsonValue WalkerActor::serialize_node(JsonObject const& node) const
     serialized.set("shadowRootMode"sv, JsonValue {});
     serialized.set("traits"sv, JsonObject {});
 
+    // FIXME: De-duplicate this string. LibDevTools currently cannot depend on LibWeb.
+    serialized.set("namespaceURI"sv, "http://www.w3.org/1999/xhtml"sv);
+
     if (!is_top_level_document) {
         if (auto parent = m_dom_node_to_parent_map.get(&node); parent.has_value() && parent.value()) {
             actor = parent.value()->get_string("actor"sv);
diff --git a/Libraries/LibDevTools/DevToolsDelegate.h b/Libraries/LibDevTools/DevToolsDelegate.h
index b293c9dd791..6c070227c79 100644
--- a/Libraries/LibDevTools/DevToolsDelegate.h
+++ b/Libraries/LibDevTools/DevToolsDelegate.h
@@ -46,6 +46,7 @@ public:
     virtual void set_dom_node_tag(TabDescription const&, Web::UniqueNodeID, String, OnDOMNodeEditComplete) const { }
     virtual void add_dom_node_attributes(TabDescription const&, Web::UniqueNodeID, Vector<WebView::Attribute>, OnDOMNodeEditComplete) const { }
     virtual void replace_dom_node_attribute(TabDescription const&, Web::UniqueNodeID, String, Vector<WebView::Attribute>, OnDOMNodeEditComplete) const { }
+    virtual void create_child_element(TabDescription const&, Web::UniqueNodeID, OnDOMNodeEditComplete) const { }
     virtual void remove_dom_node(TabDescription const&, Web::UniqueNodeID, OnDOMNodeEditComplete) const { }
 
     using OnScriptEvaluationComplete = Function<void(ErrorOr<JsonValue>)>;
diff --git a/Libraries/LibWebView/Application.cpp b/Libraries/LibWebView/Application.cpp
index 65225494182..523bed44c6a 100644
--- a/Libraries/LibWebView/Application.cpp
+++ b/Libraries/LibWebView/Application.cpp
@@ -486,6 +486,13 @@ void Application::replace_dom_node_attribute(DevTools::TabDescription const& des
     });
 }
 
+void Application::create_child_element(DevTools::TabDescription const& description, Web::UniqueNodeID node_id, OnDOMNodeEditComplete on_complete) const
+{
+    edit_dom_node(description, move(on_complete), [&](auto& view) {
+        view.create_child_element(node_id);
+    });
+}
+
 void Application::remove_dom_node(DevTools::TabDescription const& description, Web::UniqueNodeID node_id, OnDOMNodeEditComplete on_complete) const
 {
     edit_dom_node(description, move(on_complete), [&](auto& view) {
diff --git a/Libraries/LibWebView/Application.h b/Libraries/LibWebView/Application.h
index 1a49e3f11b9..71a2136c682 100644
--- a/Libraries/LibWebView/Application.h
+++ b/Libraries/LibWebView/Application.h
@@ -102,6 +102,7 @@ private:
     virtual void set_dom_node_tag(DevTools::TabDescription const&, Web::UniqueNodeID, String, OnDOMNodeEditComplete) const override;
     virtual void add_dom_node_attributes(DevTools::TabDescription const&, Web::UniqueNodeID, Vector<Attribute>, OnDOMNodeEditComplete) const override;
     virtual void replace_dom_node_attribute(DevTools::TabDescription const&, Web::UniqueNodeID, String, Vector<Attribute>, OnDOMNodeEditComplete) const override;
+    virtual void create_child_element(DevTools::TabDescription const&, Web::UniqueNodeID, OnDOMNodeEditComplete) const override;
     virtual void remove_dom_node(DevTools::TabDescription const&, Web::UniqueNodeID, OnDOMNodeEditComplete) const override;
     virtual void evaluate_javascript(DevTools::TabDescription const&, String, OnScriptEvaluationComplete) const override;
     virtual void listen_for_console_messages(DevTools::TabDescription const&, OnConsoleMessageAvailable, OnReceivedConsoleMessages) const override;