7 files changed, 70 insertions, 4 deletions
diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index f60e97d754..1b0ca1a2f0 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -420,6 +420,7 @@ libweb_js_wrapper(HTML/ImageData)
 libweb_js_wrapper(HTML/MessageChannel)
 libweb_js_wrapper(HTML/MessageEvent)
 libweb_js_wrapper(HTML/MessagePort)
+libweb_js_wrapper(HTML/PageTransitionEvent)
 libweb_js_wrapper(HTML/SubmitEvent)
 libweb_js_wrapper(HTML/WebSocket)
 libweb_js_wrapper(HighResolutionTime/Performance)
diff --git a/Userland/Libraries/LibWeb/DOM/Window.cpp b/Userland/Libraries/LibWeb/DOM/Window.cpp
index 3e2532e9b5..5806c8418c 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Window.cpp
@@ -12,6 +12,7 @@
 #include <LibWeb/DOM/EventDispatcher.h>
 #include <LibWeb/DOM/Timer.h>
 #include <LibWeb/DOM/Window.h>
+#include <LibWeb/HTML/PageTransitionEvent.h>
 #include <LibWeb/HighResolutionTime/Performance.h>
 #include <LibWeb/Layout/InitialContainingBlock.h>
 #include <LibWeb/Page/BrowsingContext.h>
@@ -276,4 +277,22 @@ float Window::scroll_y() const
     return 0;
 }
 
+// https://html.spec.whatwg.org/#fire-a-page-transition-event
+void Window::fire_a_page_transition_event(FlyString event_name, bool persisted)
+{
+    // To fire a page transition event named eventName at a Window window with a boolean persisted,
+    // fire an event named eventName at window, using PageTransitionEvent,
+    // with the persisted attribute initialized to persisted,
+    auto event = HTML::PageTransitionEvent::create(move(event_name), persisted);
+
+    // ...the cancelable attribute intialized to true,
+    event->set_cancelable(true);
+
+    // the bubbles attribute initialized to true,
+    event->set_bubbles(true);
+
+    // and legacy target override flag set.
+    dispatch_event(move(event));
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Window.h b/Userland/Libraries/LibWeb/DOM/Window.h
index f17873cf49..7800d25cbb 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.h
+++ b/Userland/Libraries/LibWeb/DOM/Window.h
@@ -83,6 +83,8 @@ public:
     float scroll_x() const;
     float scroll_y() const;
 
+    void fire_a_page_transition_event(FlyString event_name, bool persisted);
+
 private:
     explicit Window(Document&);
 
diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index bae3610e66..fcc00aca80 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -346,6 +346,7 @@ class MessageEventWrapper;
 class MessagePortWrapper;
 class MouseEventWrapper;
 class NodeWrapper;
+class PageTransitionEventWrapper;
 class PerformanceTimingWrapper;
 class PerformanceWrapper;
 class ProcessingInstructionWrapper;
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
new file mode 100644
index 0000000000..7c3602ed1f
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/Event.h>
+
+namespace Web::HTML {
+
+class PageTransitionEvent final : public DOM::Event {
+public:
+    using WrapperType = Bindings::PageTransitionEventWrapper;
+
+    static NonnullRefPtr<PageTransitionEvent> create(FlyString event_name, bool persisted)
+    {
+        return adopt_ref(*new PageTransitionEvent(move(event_name), persisted));
+    }
+
+    virtual ~PageTransitionEvent() override = default;
+
+    bool persisted() const { return m_persisted; }
+
+protected:
+    PageTransitionEvent(FlyString event_name, bool persisted)
+        : DOM::Event(move(event_name))
+        , m_persisted(persisted)
+    {
+    }
+
+    bool m_persisted { false };
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl
new file mode 100644
index 0000000000..e569647c3a
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.idl
@@ -0,0 +1,5 @@
+interface PageTransitionEvent : Event {
+
+    readonly attribute boolean persisted;
+
+};
diff --git a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
index be45d48140..7a117bea5d 100644
--- a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
@@ -246,14 +246,15 @@ void HTMLParser::the_end()
         if (!document->browsing_context())
             return;
 
-        // FIXME: 3. Let window be the Document's relevant global object.
+        // 3. Let window be the Document's relevant global object.
+        NonnullRefPtr<DOM::Window> window = document->window();
 
         // FIXME: 4. Set the Document's load timing info's load event start time to the current high resolution time given window.
 
         // 5. Fire an event named load at window, with legacy target override flag set.
         // FIXME: The legacy target override flag is currently set by a virtual override of dispatch_event()
         //        We should reorganize this so that the flag appears explicitly here instead.
-        document->window().dispatch_event(DOM::Event::create(HTML::EventNames::load));
+        window->dispatch_event(DOM::Event::create(HTML::EventNames::load));
 
         // FIXME: 6. Invoke WebDriver BiDi load complete with the Document's browsing context, and a new WebDriver BiDi navigation status whose id is the Document object's navigation id, status is "complete", and url is the Document object's URL.
 
@@ -267,7 +268,8 @@ void HTMLParser::the_end()
         // 10. Set the Document's page showing flag to true.
         document->set_page_showing(true);
 
-        // FIXME: 11. Fire a page transition event named pageshow at window with false.
+        // 11. Fire a page transition event named pageshow at window with false.
+        window->fire_a_page_transition_event(HTML::EventNames::pageshow, false);
 
         // 12. Completely finish loading the Document.
         document->completely_finish_loading();