From 274411db9756a9dffe44e21b4da09c7808e9f465 Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Tue, 8 Oct 2024 16:27:40 +0200
Subject: [PATCH] LibWeb: Support Document.onvisibilitychange

We don't have a way to trigger this from a test, but the fix is so
simple that we might as well get it in. :^)
---
 Userland/Libraries/LibWeb/DOM/Document.cpp | 10 ++++++++++
 Userland/Libraries/LibWeb/DOM/Document.h   |  3 +++
 Userland/Libraries/LibWeb/DOM/Document.idl |  2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 3fbe3f1ba86..feea781db74 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -5676,4 +5676,14 @@ void Document::set_onreadystatechange(WebIDL::CallbackType* value)
     set_event_handler_attribute(HTML::EventNames::readystatechange, value);
 }
 
+WebIDL::CallbackType* Document::onvisibilitychange()
+{
+    return event_handler_attribute(HTML::EventNames::visibilitychange);
+}
+
+void Document::set_onvisibilitychange(WebIDL::CallbackType* value)
+{
+    set_event_handler_attribute(HTML::EventNames::visibilitychange, value);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index a81fb8d70fe..dc4466681ee 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -734,6 +734,9 @@ public:
     [[nodiscard]] WebIDL::CallbackType* onreadystatechange();
     void set_onreadystatechange(WebIDL::CallbackType*);
 
+    [[nodiscard]] WebIDL::CallbackType* onvisibilitychange();
+    void set_onvisibilitychange(WebIDL::CallbackType*);
+
 protected:
     virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
diff --git a/Userland/Libraries/LibWeb/DOM/Document.idl b/Userland/Libraries/LibWeb/DOM/Document.idl
index 19fb2a7b7d5..10b5b1dc545 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.idl
+++ b/Userland/Libraries/LibWeb/DOM/Document.idl
@@ -152,7 +152,7 @@ interface Document : Node {
 
     // special event handler IDL attributes that only apply to Document objects
     [LegacyLenientThis] attribute EventHandler onreadystatechange;
-    [FIXME] attribute EventHandler onvisibilitychange;
+    attribute EventHandler onvisibilitychange;
 };
 
 dictionary ElementCreationOptions {