diff --git a/Libraries/LibWeb/HTML/HTMLFrameElement.cpp b/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
index 45a5aac519b..e171b199e7b 100644
--- a/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
@@ -51,7 +51,7 @@ void HTMLFrameElement::inserted()
     // 3. Create a new child navigable for insertedNode.
     MUST(create_new_child_navigable(GC::create_function(realm().heap(), [this] {
         // 4. Process the frame attributes for insertedNode, with initialInsertion set to true.
-        process_the_frame_attributes(true);
+        process_the_frame_attributes(InitialInsertion::Yes);
         set_content_navigable_has_session_history_entry_and_ready_for_navigation();
     })));
 }
@@ -91,7 +91,7 @@ void HTMLFrameElement::adjust_computed_style(CSS::ComputedProperties& style)
 }
 
 // https://html.spec.whatwg.org/multipage/obsolete.html#process-the-frame-attributes
-void HTMLFrameElement::process_the_frame_attributes(bool initial_insertion)
+void HTMLFrameElement::process_the_frame_attributes(InitialInsertion initial_insertion)
 {
     // 1. Let url be the result of running the shared attribute processing steps for iframe and frame elements given
     //    element and initialInsertion.
@@ -102,7 +102,7 @@ void HTMLFrameElement::process_the_frame_attributes(bool initial_insertion)
         return;
 
     // 3. If url matches about:blank and initialInsertion is true, then:
-    if (url_matches_about_blank(*url) && initial_insertion) {
+    if (url_matches_about_blank(*url) && initial_insertion == InitialInsertion::Yes) {
         // 1. Fire an event named load at element.
         dispatch_event(DOM::Event::create(realm(), HTML::EventNames::load));
 
@@ -110,8 +110,8 @@ void HTMLFrameElement::process_the_frame_attributes(bool initial_insertion)
         return;
     }
 
-    // 3. Navigate an iframe or frame given element, url, and the empty string.
-    navigate_an_iframe_or_frame(*url, ReferrerPolicy::ReferrerPolicy::EmptyString);
+    // 3. Navigate an iframe or frame given element, url, the empty string, and initialInsertion.
+    navigate_an_iframe_or_frame(*url, ReferrerPolicy::ReferrerPolicy::EmptyString, {}, initial_insertion);
 }
 
 }
diff --git a/Libraries/LibWeb/HTML/HTMLFrameElement.h b/Libraries/LibWeb/HTML/HTMLFrameElement.h
index 0708e0a9e2a..e4328795608 100644
--- a/Libraries/LibWeb/HTML/HTMLFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLFrameElement.h
@@ -30,7 +30,7 @@ private:
     virtual i32 default_tab_index_value() const override;
     virtual void adjust_computed_style(CSS::ComputedProperties&) override;
 
-    void process_the_frame_attributes(bool initial_insertion = false);
+    void process_the_frame_attributes(InitialInsertion = InitialInsertion::No);
 };
 
 }
diff --git a/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp b/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
index a9cbc1ca59d..1a8a7743fb2 100644
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@@ -93,7 +93,7 @@ void HTMLIFrameElement::post_connection()
         //           value and insertedNode's iframe sandboxing flag set.
 
         // 3. Process the iframe attributes for insertedNode, with initialInsertion set to true.
-        process_the_iframe_attributes(true);
+        process_the_iframe_attributes(InitialInsertion::Yes);
 
         if (auto navigable = content_navigable()) {
             auto traversable = navigable->traversable_navigable();
@@ -105,7 +105,7 @@ void HTMLIFrameElement::post_connection()
 }
 
 // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#process-the-iframe-attributes
-void HTMLIFrameElement::process_the_iframe_attributes(bool initial_insertion)
+void HTMLIFrameElement::process_the_iframe_attributes(InitialInsertion initial_insertion)
 {
     if (!content_navigable())
         return;
@@ -152,7 +152,7 @@ void HTMLIFrameElement::process_the_iframe_attributes(bool initial_insertion)
     }
 
     // 3. If url matches about:blank and initialInsertion is true, then:
-    if (url_matches_about_blank(*url) && initial_insertion) {
+    if (url_matches_about_blank(*url) && initial_insertion == InitialInsertion::Yes) {
         // 1. Run the iframe load event steps given element.
         run_iframe_load_event_steps(*this);
 
diff --git a/Libraries/LibWeb/HTML/HTMLIFrameElement.h b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
index f51c811e4ed..d773ecef84a 100644
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
@@ -55,7 +55,7 @@ private:
     virtual bool supports_dimension_attributes() const override { return true; }
 
     // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#process-the-iframe-attributes
-    void process_the_iframe_attributes(bool initial_insertion = false);
+    void process_the_iframe_attributes(InitialInsertion = InitialInsertion::No);
 
     // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#current-navigation-was-lazy-loaded
     bool m_current_navigation_was_lazy_loaded { false };
diff --git a/Libraries/LibWeb/HTML/Navigable.cpp b/Libraries/LibWeb/HTML/Navigable.cpp
index 65c4870050c..4901648888f 100644
--- a/Libraries/LibWeb/HTML/Navigable.cpp
+++ b/Libraries/LibWeb/HTML/Navigable.cpp
@@ -1453,7 +1453,8 @@ WebIDL::ExceptionOr<void> Navigable::navigate(NavigateParams params)
 // an optional entry list or null formDataEntryList (default null),
 // an optional referrer policy referrerPolicy (default the empty string),
 // an optional user navigation involvement userInvolvement (default "none"),
-// and an optional Element sourceElement (default null):
+// an optional Element sourceElement (default null),
+// and an optional boolean initialInsertion (default false):
 
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate
 void Navigable::begin_navigation(NavigateParams params)
@@ -1472,6 +1473,7 @@ void Navigable::begin_navigation(NavigateParams params)
     auto referrer_policy = params.referrer_policy;
     auto user_involvement = params.user_involvement;
     auto source_element = params.source_element;
+    auto initial_insertion = params.initial_insertion;
     auto& active_document = *this->active_document();
     auto& vm = this->vm();
 
@@ -1575,10 +1577,10 @@ void Navigable::begin_navigation(NavigateParams params)
 
     // 19. If url's scheme is "javascript", then:
     if (url.scheme() == "javascript"sv) {
-        // 1. Queue a global task on the navigation and traversal task source given navigable's active window to navigate to a javascript: URL given navigable, url, historyHandling, sourceSnapshotParams, initiatorOriginSnapshot, userInvolvement, and cspNavigationType.
+        // 1. Queue a global task on the navigation and traversal task source given navigable's active window to navigate to a javascript: URL given navigable, url, historyHandling, sourceSnapshotParams, initiatorOriginSnapshot, userInvolvement, cspNavigationType, and initialInsertion.
         VERIFY(active_window());
-        queue_global_task(Task::Source::NavigationAndTraversal, *active_window(), GC::create_function(heap(), [this, url, history_handling, source_snapshot_params, initiator_origin_snapshot, user_involvement, csp_navigation_type, navigation_id] {
-            navigate_to_a_javascript_url(url, to_history_handling_behavior(history_handling), source_snapshot_params, initiator_origin_snapshot, user_involvement, csp_navigation_type, navigation_id);
+        queue_global_task(Task::Source::NavigationAndTraversal, *active_window(), GC::create_function(heap(), [this, url, history_handling, source_snapshot_params, initiator_origin_snapshot, user_involvement, csp_navigation_type, initial_insertion, navigation_id] {
+            navigate_to_a_javascript_url(url, to_history_handling_behavior(history_handling), source_snapshot_params, initiator_origin_snapshot, user_involvement, csp_navigation_type, initial_insertion, navigation_id);
         }));
 
         // 2. Return.
@@ -1921,7 +1923,7 @@ GC::Ptr<DOM::Document> Navigable::evaluate_javascript_url(URL::URL const& url, U
 }
 
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate-to-a-javascript:-url
-void Navigable::navigate_to_a_javascript_url(URL::URL const& url, HistoryHandlingBehavior history_handling, GC::Ref<SourceSnapshotParams> source_snapshot_params, URL::Origin const& initiator_origin, UserNavigationInvolvement user_involvement, ContentSecurityPolicy::Directives::Directive::NavigationType csp_navigation_type, String navigation_id)
+void Navigable::navigate_to_a_javascript_url(URL::URL const& url, HistoryHandlingBehavior history_handling, GC::Ref<SourceSnapshotParams> source_snapshot_params, URL::Origin const& initiator_origin, UserNavigationInvolvement user_involvement, ContentSecurityPolicy::Directives::Directive::NavigationType csp_navigation_type, InitialInsertion initial_insertion, String navigation_id)
 {
     auto& vm = this->vm();
 
@@ -1947,8 +1949,15 @@ void Navigable::navigate_to_a_javascript_url(URL::URL const& url, HistoryHandlin
     // 6. Let newDocument be the result of evaluating a javascript: URL given targetNavigable, url, initiatorOrigin, and userInvolvement.
     auto new_document = evaluate_javascript_url(url, initiator_origin, user_involvement, navigation_id);
 
-    // 7. If newDocument is null, then return.
+    // 7. If newDocument is null:
     if (!new_document) {
+        // 1. If initialInsertion is true and targetNavigable's active document's is initial about:blank is true,
+        //    then run the iframe load event steps given targetNavigable's container.
+        if (initial_insertion == InitialInsertion::Yes && active_document()->is_initial_about_blank()) {
+            run_iframe_load_event_steps(as<HTMLIFrameElement>(*container()));
+        }
+
+        // 2. Return.
         // NOTE: In this case, some JavaScript code was executed, but no new Document was created, so we will not perform a navigation.
         return;
     }
diff --git a/Libraries/LibWeb/HTML/Navigable.h b/Libraries/LibWeb/HTML/Navigable.h
index 0ed73282546..0a1bcdc15c6 100644
--- a/Libraries/LibWeb/HTML/Navigable.h
+++ b/Libraries/LibWeb/HTML/Navigable.h
@@ -28,6 +28,11 @@
 
 namespace Web::HTML {
 
+enum class InitialInsertion : u8 {
+    Yes,
+    No,
+};
+
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#target-snapshot-params
 struct TargetSnapshotParams {
     SandboxingFlagSet sandboxing_flags {};
@@ -142,6 +147,7 @@ public:
         ReferrerPolicy::ReferrerPolicy referrer_policy = ReferrerPolicy::ReferrerPolicy::EmptyString;
         UserNavigationInvolvement user_involvement = UserNavigationInvolvement::None;
         GC::Ptr<DOM::Element> source_element = nullptr;
+        InitialInsertion initial_insertion = InitialInsertion::No;
 
         void visit_edges(Cell::Visitor& visitor);
     };
@@ -205,7 +211,7 @@ protected:
 private:
     void begin_navigation(NavigateParams);
     void navigate_to_a_fragment(URL::URL const&, HistoryHandlingBehavior, UserNavigationInvolvement, GC::Ptr<DOM::Element> source_element, Optional<SerializationRecord> navigation_api_state, String navigation_id);
-    void navigate_to_a_javascript_url(URL::URL const&, HistoryHandlingBehavior, GC::Ref<SourceSnapshotParams>, URL::Origin const& initiator_origin, UserNavigationInvolvement, ContentSecurityPolicy::Directives::Directive::NavigationType csp_navigation_type, String navigation_id);
+    void navigate_to_a_javascript_url(URL::URL const&, HistoryHandlingBehavior, GC::Ref<SourceSnapshotParams>, URL::Origin const& initiator_origin, UserNavigationInvolvement, ContentSecurityPolicy::Directives::Directive::NavigationType csp_navigation_type, InitialInsertion, String navigation_id);
 
     void reset_cursor_blink_cycle();
 
diff --git a/Libraries/LibWeb/HTML/NavigableContainer.cpp b/Libraries/LibWeb/HTML/NavigableContainer.cpp
index ae6eefdaab8..ef55557df12 100644
--- a/Libraries/LibWeb/HTML/NavigableContainer.cpp
+++ b/Libraries/LibWeb/HTML/NavigableContainer.cpp
@@ -195,14 +195,14 @@ HTML::WindowProxy* NavigableContainer::content_window()
 }
 
 // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#shared-attribute-processing-steps-for-iframe-and-frame-elements
-Optional<URL::URL> NavigableContainer::shared_attribute_processing_steps_for_iframe_and_frame(bool initial_insertion)
+Optional<URL::URL> NavigableContainer::shared_attribute_processing_steps_for_iframe_and_frame(InitialInsertion initial_insertion)
 {
     // AD-HOC: If the element was added and immediately removed, the content navigable will be null. Don't process the
     //         src attribute any further.
     if (!m_content_navigable)
         return {};
 
-    if (initial_insertion && m_content_navigable->has_pending_navigations()) {
+    if (initial_insertion == InitialInsertion::Yes && m_content_navigable->has_pending_navigations()) {
         return {};
     }
 
@@ -228,7 +228,7 @@ Optional<URL::URL> NavigableContainer::shared_attribute_processing_steps_for_ifr
     }
 
     // 4. If url matches about:blank and initialInsertion is true, then perform the URL and history update steps given element's content navigable's active document and url.
-    if (url_matches_about_blank(url) && initial_insertion) {
+    if (url_matches_about_blank(url) && initial_insertion == InitialInsertion::Yes) {
         auto& document = *m_content_navigable->active_document();
         perform_url_and_history_update_steps(document, url);
     }
@@ -238,7 +238,7 @@ Optional<URL::URL> NavigableContainer::shared_attribute_processing_steps_for_ifr
 }
 
 // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#navigate-an-iframe-or-frame
-void NavigableContainer::navigate_an_iframe_or_frame(URL::URL url, ReferrerPolicy::ReferrerPolicy referrer_policy, Optional<String> srcdoc_string)
+void NavigableContainer::navigate_an_iframe_or_frame(URL::URL url, ReferrerPolicy::ReferrerPolicy referrer_policy, Optional<String> srcdoc_string, InitialInsertion initial_insertion)
 {
     // 1. Let historyHandling be "auto".
     auto history_handling = Bindings::NavigationHistoryBehavior::Auto;
@@ -252,7 +252,8 @@ void NavigableContainer::navigate_an_iframe_or_frame(URL::URL url, ReferrerPolic
     //           time given element's node document's relevant global object.
 
     // 4. Navigate element's content navigable to url using element's node document, with historyHandling set to historyHandling,
-    //    referrerPolicy set to referrerPolicy, and documentResource set to scrdocString.
+    //    referrerPolicy set to referrerPolicy, documentResource set to srcdocString, and initialInsertion set to
+    //    initialInsertion.
     Variant<Empty, String, POSTResource> document_resource = Empty {};
     if (srcdoc_string.has_value())
         document_resource = srcdoc_string.value();
@@ -263,6 +264,7 @@ void NavigableContainer::navigate_an_iframe_or_frame(URL::URL url, ReferrerPolic
         .document_resource = document_resource,
         .history_handling = history_handling,
         .referrer_policy = referrer_policy,
+        .initial_insertion = initial_insertion,
     }));
 }
 
diff --git a/Libraries/LibWeb/HTML/NavigableContainer.h b/Libraries/LibWeb/HTML/NavigableContainer.h
index 5a39f16e3cd..95da4af5a2a 100644
--- a/Libraries/LibWeb/HTML/NavigableContainer.h
+++ b/Libraries/LibWeb/HTML/NavigableContainer.h
@@ -51,10 +51,10 @@ protected:
     virtual void visit_edges(Cell::Visitor&) override;
 
     // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#shared-attribute-processing-steps-for-iframe-and-frame-elements
-    Optional<URL::URL> shared_attribute_processing_steps_for_iframe_and_frame(bool initial_insertion);
+    Optional<URL::URL> shared_attribute_processing_steps_for_iframe_and_frame(InitialInsertion initial_insertion);
 
     // 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 = {});
+    void navigate_an_iframe_or_frame(URL::URL url, ReferrerPolicy::ReferrerPolicy referrer_policy, Optional<String> srcdoc_string = {}, InitialInsertion = InitialInsertion::No);
 
     WebIDL::ExceptionOr<void> create_new_child_navigable(GC::Ptr<GC::Function<void()>> after_session_history_update = {});