diff --git a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
index 24ca3786947..512fd0a119e 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@@ -60,12 +60,13 @@ void HTMLIFrameElement::inserted()
     // When an iframe element element is inserted into a document whose browsing context is non-null, the user agent must run these steps:
     if (in_a_document_tree() && document().browsing_context()) {
         // 1. Create a new child navigable for element.
-        MUST(create_new_child_navigable());
+        MUST(create_new_child_navigable([this] {
+            // 3. Process the iframe attributes for element, with initialInsertion set to true.
+            process_the_iframe_attributes(true);
+            set_content_navigable_initialized();
+        }));
 
         // FIXME: 2. If element has a sandbox attribute, then parse the sandboxing directive given the attribute's value and element's iframe sandboxing flag set.
-
-        // 3. Process the iframe attributes for element, with initialInsertion set to true.
-        process_the_iframe_attributes(true);
     }
 }
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
index cc90332ca7e..810063c2406 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
@@ -255,8 +255,10 @@ void HTMLObjectElement::run_object_representation_handler_steps(Optional<ByteStr
     // * If the resource type is an XML MIME type, or if the resource type does not start with "image/"
     if (resource_type.has_value() && (is_xml_mime_type(*resource_type) || !resource_type->starts_with("image/"sv))) {
         // If the object element's content navigable is null, then create a new child navigable for the element.
-        if (!m_content_navigable)
+        if (!m_content_navigable) {
             MUST(create_new_child_navigable());
+            set_content_navigable_initialized();
+        }
 
         // NOTE: Creating a new nested browsing context can fail if the document is not attached to a browsing context
         if (!m_content_navigable)
diff --git a/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp b/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
index 609c1b4ce30..29366db0b27 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
@@ -59,7 +59,7 @@ JS::GCPtr<NavigableContainer> NavigableContainer::navigable_container_with_conte
 }
 
 // https://html.spec.whatwg.org/multipage/document-sequences.html#create-a-new-child-navigable
-WebIDL::ExceptionOr<void> NavigableContainer::create_new_child_navigable()
+WebIDL::ExceptionOr<void> NavigableContainer::create_new_child_navigable(JS::SafeFunction<void()> afterSessionHistoryUpdate)
 {
     // 1. Let parentNavigable be element's node navigable.
     auto parent_navigable = navigable();
@@ -110,7 +110,7 @@ WebIDL::ExceptionOr<void> NavigableContainer::create_new_child_navigable()
     auto traversable = parent_navigable->traversable_navigable();
 
     // 12. Append the following session history traversal steps to traversable:
-    traversable->append_session_history_traversal_steps([traversable, navigable, parent_navigable, history_entry] {
+    traversable->append_session_history_traversal_steps([traversable, navigable, parent_navigable, history_entry, afterSessionHistoryUpdate = move(afterSessionHistoryUpdate)] {
         // 1. Let parentDocState be parentNavigable's active session history entry's document state.
 
         auto parent_doc_state = parent_navigable->active_session_history_entry()->document_state();
@@ -137,6 +137,10 @@ WebIDL::ExceptionOr<void> NavigableContainer::create_new_child_navigable()
 
         // 6. Update for navigable creation/destruction given traversable
         traversable->update_for_navigable_creation_or_destruction();
+
+        if (afterSessionHistoryUpdate) {
+            afterSessionHistoryUpdate();
+        }
     });
 
     return {};
@@ -300,6 +304,9 @@ void NavigableContainer::destroy_the_child_navigable()
 // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#potentially-delays-the-load-event
 bool NavigableContainer::currently_delays_the_load_event() const
 {
+    if (!m_content_navigable_initialized)
+        return true;
+
     if (!m_potentially_delays_the_load_event)
         return false;
 
diff --git a/Userland/Libraries/LibWeb/HTML/NavigableContainer.h b/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
index 1c9f7e729ad..1f899c22a7f 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
@@ -62,16 +62,19 @@ protected:
     // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#navigate-an-iframe-or-frame
     void navigate_an_iframe_or_frame(URL::URL url, ReferrerPolicy::ReferrerPolicy referrer_policy, Optional<String> srcdoc_string = {});
 
-    WebIDL::ExceptionOr<void> create_new_child_navigable();
+    WebIDL::ExceptionOr<void> create_new_child_navigable(JS::SafeFunction<void()> afterSessionHistoryUpdate = {});
 
     // https://html.spec.whatwg.org/multipage/document-sequences.html#content-navigable
     JS::GCPtr<Navigable> m_content_navigable { nullptr };
 
     void set_potentially_delays_the_load_event(bool value) { m_potentially_delays_the_load_event = value; }
 
+    void set_content_navigable_initialized() { m_content_navigable_initialized = true; }
+
 private:
     virtual bool is_navigable_container() const override { return true; }
     bool m_potentially_delays_the_load_event { true };
+    bool m_content_navigable_initialized { false };
 };
 
 }