diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
index bb77a9b04a..1dfa836833 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
@@ -49,7 +49,7 @@ bool url_matches_about_blank(AK::URL const& url)
 }
 
 // https://html.spec.whatwg.org/multipage/document-sequences.html#determining-the-origin
-HTML::Origin determine_the_origin(AK::URL const& url, SandboxingFlagSet sandbox_flags, Optional<HTML::Origin> source_origin, Optional<HTML::Origin> container_origin)
+HTML::Origin determine_the_origin(AK::URL const& url, SandboxingFlagSet sandbox_flags, Optional<HTML::Origin> source_origin)
 {
     // 1. If sandboxFlags has its sandboxed origin browsing context flag set, then return a new opaque origin.
     if (has_flag(sandbox_flags, SandboxingFlagSet::SandboxedOrigin)) {
@@ -61,11 +61,11 @@ HTML::Origin determine_the_origin(AK::URL const& url, SandboxingFlagSet sandbox_
 
     // 3. If url is about:srcdoc, then:
     if (url == "about:srcdoc"sv) {
-        // 1. Assert: containerOrigin is non-null.
-        VERIFY(container_origin.has_value());
+        // 1. Assert: sourceOrigin is non-null.
+        VERIFY(source_origin.has_value());
 
-        // 2. Return containerOrigin.
-        return container_origin.release_value();
+        // 2. Return sourceOrigin.
+        return source_origin.release_value();
     }
 
     // 4. If url matches about:blank and sourceOrigin is non-null, then return sourceOrigin.
@@ -134,8 +134,8 @@ WebIDL::ExceptionOr<BrowsingContext::BrowsingContextAndDocument> BrowsingContext
     // FIXME: 5. Let sandboxFlags be the result of determining the creation sandboxing flags given browsingContext and embedder.
     SandboxingFlagSet sandbox_flags = {};
 
-    // 6. Let origin be the result of determining the origin given about:blank, sandboxFlags, creatorOrigin, and null.
-    auto origin = determine_the_origin(AK::URL("about:blank"sv), sandbox_flags, creator_origin, {});
+    // 6. Let origin be the result of determining the origin given about:blank, sandboxFlags, and creatorOrigin.
+    auto origin = determine_the_origin(AK::URL("about:blank"sv), sandbox_flags, creator_origin);
 
     // FIXME: 7. Let permissionsPolicy be the result of creating a permissions policy given browsingContext and origin. [PERMISSIONSPOLICY]
 
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
index 3d743b15ea..0c8047f5a3 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
@@ -278,7 +278,7 @@ private:
     bool m_has_been_discarded { false };
 };
 
-HTML::Origin determine_the_origin(AK::URL const& url, SandboxingFlagSet sandbox_flags, Optional<HTML::Origin> source_origin, Optional<HTML::Origin> container_origin);
+HTML::Origin determine_the_origin(AK::URL const& url, SandboxingFlagSet sandbox_flags, Optional<HTML::Origin> source_origin);
 
 SandboxingFlagSet determine_the_creation_sandboxing_flags(BrowsingContext const&, JS::GCPtr<DOM::Element> embedder);
 
diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.cpp b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
index 7b36a98b0e..d2fbc63d6a 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigable.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
@@ -399,7 +399,7 @@ static WebIDL::ExceptionOr<NavigationParams> create_navigation_params_from_a_src
     response->set_body(TRY(Fetch::Infrastructure::byte_sequence_as_body(realm, document_resource.get<String>().bytes())));
 
     // 3. Let responseOrigin be the result of determining the origin given response's URL, targetSnapshotParams's sandboxing flags, null, and entry's document state's origin.
-    auto response_origin = determine_the_origin(*response->url(), SandboxingFlagSet {}, {}, entry->document_state->origin());
+    auto response_origin = determine_the_origin(*response->url(), SandboxingFlagSet {}, entry->document_state->origin());
 
     // 4. Let coop be a new cross-origin opener policy.
     CrossOriginOpenerPolicy coop;
@@ -598,9 +598,8 @@ static WebIDL::ExceptionOr<Optional<NavigationParams>> create_navigation_params_
             entry->document_state->set_resource(Empty {});
         }
 
-        // 11. Set responseOrigin to the result of determining the origin given response's URL, finalSandboxFlags,
-        //     entry's document state's initiator origin, and null.
-        response_origin = determine_the_origin(*response_holder->response()->url(), final_sandbox_flags, entry->document_state->initiator_origin(), {});
+        // 11. Set responseOrigin to the result of determining the origin given response's URL, finalSandboxFlags, and entry's document state's initiator origin.
+        response_origin = determine_the_origin(*response_holder->response()->url(), final_sandbox_flags, entry->document_state->initiator_origin());
 
         // 14. Set locationURL to response's location URL given currentURL's fragment.
         auto location_url = response_holder->response()->location_url(current_url.fragment());