LibWeb: Add a "page showing" flag to documents

This will be used to determine whether "pageshow" and "pagehide" events
are appropriate. We won't actually make use of it until we implement
more of history traversal and document unloading.

2 files changed, 10 insertions, 2 deletions

diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index ab5e5edee3..fe89703d54 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -294,6 +294,9 @@ public:
         --m_number_of_things_delaying_the_load_event;
     }
 
+    bool page_showing() const { return m_page_showing; }
+    void set_page_showing(bool value) { m_page_showing = value; }
+
 private:
     explicit Document(const AK::URL&);
 
@@ -378,6 +381,9 @@ private:
     NonnullRefPtr<HTML::History> m_history;
 
     size_t m_number_of_things_delaying_the_load_event { 0 };
+
+    // https://html.spec.whatwg.org/#page-showing
+    bool m_page_showing { false };
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
index 8f84c18adb..be45d48140 100644
--- a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
@@ -261,9 +261,11 @@ void HTMLParser::the_end()
 
         // FIXME: 8. Set the Document's load timing info's load event end time to the current high resolution time given window.
 
-        // FIXME: 9. Assert: Document's page showing is false.
+        // 9. Assert: Document's page showing is false.
+        VERIFY(!document->page_showing());
 
-        // FIXME: 10. Set the Document's page showing flag to true.
+        // 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.