From 2fc8fdf3817a4e94e760a1c5a68bcc329316c82d Mon Sep 17 00:00:00 2001
From: Simon Farre <simon.farre.cx@gmail.com>
Date: Sun, 13 Apr 2025 16:22:15 +0200
Subject: [PATCH] LibWeb: Set user activation when `this` is `Document`

EventTarget::dispatch_event, per comments, does ad-hoc solution for UA,
and I don't know why it checks if `this` is window or `element`, but
web platform tests would fail, because `this` would actually be a
`Document` type.
---
 Libraries/LibWeb/DOM/EventTarget.cpp | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/Libraries/LibWeb/DOM/EventTarget.cpp b/Libraries/LibWeb/DOM/EventTarget.cpp
index b37bf0a415f..596b7cf3aec 100644
--- a/Libraries/LibWeb/DOM/EventTarget.cpp
+++ b/Libraries/LibWeb/DOM/EventTarget.cpp
@@ -859,16 +859,22 @@ bool EventTarget::dispatch_event(Event& event)
         auto unsafe_shared_time = HighResolutionTime::unsafe_shared_current_time();
         auto current_time = HighResolutionTime::relative_high_resolution_time(unsafe_shared_time, realm().global_object());
 
-        if (is<HTML::Window>(this)) {
-            auto* window = static_cast<HTML::Window*>(this);
+        GC::Ptr<HTML::Window> window = [&]() {
+            if (is<HTML::Window>(this))
+                return GC::Ptr { static_cast<HTML::Window*>(this) };
+
+            if (is<DOM::Element>(this))
+                return static_cast<DOM::Element const*>(this)->document().window();
+
+            if (is<DOM::Document>(this))
+                return static_cast<DOM::Document const*>(this)->window();
+
+            return GC::Ptr<HTML::Window> { nullptr };
+        }();
+
+        if (window) {
             window->set_last_activation_timestamp(current_time);
             window->close_watcher_manager()->notify_about_user_activation();
-        } else if (is<DOM::Element>(this)) {
-            auto const* element = static_cast<DOM::Element const*>(this);
-            if (auto window = element->document().window()) {
-                window->set_last_activation_timestamp(current_time);
-                window->close_watcher_manager()->notify_about_user_activation();
-            }
         }
     }