LibWeb: Implement window.stop()

Fixes a handful of timeouts on WPT.

Libraries/LibWeb/HTML/Navigable.cpp

@@ -2234,4 +2234,18 @@ void Navigable::unregister_navigation_observer(Badge<NavigationObserver>, Naviga
     VERIFY(was_removed);
 }
 
+// https://html.spec.whatwg.org/multipage/document-lifecycle.html#nav-stop
+void Navigable::stop_loading()
+{
+    // 1. Let document be navigable's active document.
+    auto document = active_document();
+
+    // 2. If document's unload counter is 0, and navigable's ongoing navigation is a navigation ID, then set the ongoing navigation for navigable to null.
+    if (document->unload_counter() == 0 && ongoing_navigation().has<String>())
+        set_ongoing_navigation(Empty {});
+
+    // 3. Abort a document and its descendants given document.
+    document->abort_a_document_and_its_descendants();
+}
+
 }

Libraries/LibWeb/HTML/Navigable.h

@@ -74,6 +74,8 @@ public:
     void set_closing(bool value) { m_closing = value; }
     bool is_script_closable();
 
+    void stop_loading();
+
     void set_delaying_load_events(bool value);
     bool is_delaying_load_events() const { return m_delaying_the_load_event.has_value(); }
 

Libraries/LibWeb/HTML/Window.cpp

@@ -856,6 +856,18 @@ GC::Ref<History> Window::history() const
     return associated_document().history();
 }
 
+// https://html.spec.whatwg.org/multipage/nav-history-apis.html#dom-window-stop
+void Window::stop()
+{
+    // 1. If this's navigable is null, then return.
+    auto navigable = this->navigable();
+    if (!navigable)
+        return;
+
+    // 2. Stop loading this's navigable.
+    navigable->stop_loading();
+}
+
 // https://html.spec.whatwg.org/multipage/interaction.html#dom-window-focus
 void Window::focus()
 {

Libraries/LibWeb/HTML/Window.h

@@ -154,6 +154,7 @@ public:
     [[nodiscard]] GC::Ref<Location> location();
     GC::Ref<History> history() const;
     GC::Ref<Navigation> navigation();
+    void stop();
     void focus();
     void blur();
 

Libraries/LibWeb/HTML/Window.idl

@@ -30,6 +30,7 @@ interface Window : EventTarget {
     readonly attribute History history;
     readonly attribute Navigation navigation;
     readonly attribute CustomElementRegistry customElements;
+    undefined stop();
     undefined focus();
     undefined blur();