diff --git a/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp b/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
index 75acd9e8bd..db67476a54 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigableContainer.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -287,4 +288,31 @@ 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_potentially_delays_the_load_event)
+        return false;
+
+    // If an element type potentially delays the load event, then for each element element of that type,
+    // the user agent must delay the load event of element's node document if element's content navigable is non-null
+    // and any of the following are true:
+    if (!m_content_navigable)
+        return false;
+
+    // - element's content navigable's active document is not ready for post-load tasks;
+    if (!m_content_navigable->active_document()->ready_for_post_load_tasks())
+        return true;
+
+    // - element's content navigable's is delaying load events is true; or
+    if (m_content_navigable->is_delaying_load_events())
+        return true;
+
+    // - anything is delaying the load event of element's content navigable's active document.
+    if (m_content_navigable->active_document()->anything_is_delaying_the_load_event())
+        return true;
+
+    return false;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/NavigableContainer.h b/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
index fce8b34941..e16e60808a 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigableContainer.h
@@ -46,6 +46,11 @@ public:
 
     void destroy_the_child_navigable();
 
+    // All elements that extend NavigableContainer "potentially delay the load event".
+    // (embed, frame, iframe, and object)
+    // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#potentially-delays-the-load-event
+    bool currently_delays_the_load_event() const;
+
 protected:
     NavigableContainer(DOM::Document&, DOM::QualifiedName);
 
@@ -62,8 +67,11 @@ protected:
     // 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; }
+
 private:
     virtual bool is_navigable_container() const override { return true; }
+    bool m_potentially_delays_the_load_event { true };
 };
 
 }