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.