diff --git a/Libraries/LibWebView/ViewImplementation.cpp b/Libraries/LibWebView/ViewImplementation.cpp
index 02bf18d7f9f0..2cf94f691e37 100644
--- a/Libraries/LibWebView/ViewImplementation.cpp
+++ b/Libraries/LibWebView/ViewImplementation.cpp
@@ -1025,4 +1025,9 @@ void ViewImplementation::did_request_media_context_menu(Badge<WebContentClient>,
         m_media_context_menu->on_activation(to_widget_position(content_position));
 }
 
+void ViewImplementation::request_close()
+{
+    client().async_request_close(page_id());
+}
+
 }
diff --git a/Libraries/LibWebView/ViewImplementation.h b/Libraries/LibWebView/ViewImplementation.h
index 97ecf4251e21..15a92aa6df3a 100644
--- a/Libraries/LibWebView/ViewImplementation.h
+++ b/Libraries/LibWebView/ViewImplementation.h
@@ -164,6 +164,8 @@ class WEBVIEW_API ViewImplementation : public SettingsObserver {
     // native GUI widgets as possible.
     void use_native_user_style_sheet();
 
+    void request_close();
+
     Function<void()> on_ready_to_paint;
     Function<String(Web::HTML::ActivateTab, Web::HTML::WebViewHints, Optional<u64>)> on_new_web_view;
     Function<void()> on_activate_tab;
diff --git a/Services/WebContent/ConnectionFromClient.cpp b/Services/WebContent/ConnectionFromClient.cpp
index 256ee03df797..f31363210ccf 100644
--- a/Services/WebContent/ConnectionFromClient.cpp
+++ b/Services/WebContent/ConnectionFromClient.cpp
@@ -1348,4 +1348,13 @@ void ConnectionFromClient::cookies_changed(Vector<Web::Cookie::Cookie> cookies)
     }
 }
 
+// https://html.spec.whatwg.org/multipage/speculative-loading.html#nav-traversal-ui:close-a-top-level-traversable
+void ConnectionFromClient::request_close(u64 page_id)
+{
+    // Browser user agents should offer users the ability to arbitrarily close any top-level traversable in their top-level traversable set.
+    // For example, by clicking a "close tab" button.
+    if (auto page = this->page(page_id); page.has_value())
+        page->page().top_level_traversable()->close_top_level_traversable();
+}
+
 }
diff --git a/Services/WebContent/ConnectionFromClient.h b/Services/WebContent/ConnectionFromClient.h
index b2b27a702247..a1b8de7aa9d8 100644
--- a/Services/WebContent/ConnectionFromClient.h
+++ b/Services/WebContent/ConnectionFromClient.h
@@ -162,6 +162,8 @@ class ConnectionFromClient final
     virtual void system_time_zone_changed() override;
     virtual void cookies_changed(Vector<Web::Cookie::Cookie>) override;
 
+    virtual void request_close(u64 page_id) override;
+
     NonnullOwnPtr<PageHost> m_page_host;
 
     HashMap<int, Web::FileRequest> m_requested_files {};
diff --git a/Services/WebContent/WebContentServer.ipc b/Services/WebContent/WebContentServer.ipc
index 4774f731cc38..7f927669cf8d 100644
--- a/Services/WebContent/WebContentServer.ipc
+++ b/Services/WebContent/WebContentServer.ipc
@@ -132,4 +132,6 @@ endpoint WebContentServer
 
     system_time_zone_changed() =|
     cookies_changed(Vector<Web::Cookie::Cookie> cookies) =|
+
+    request_close(u64 page_id) =|
 }
diff --git a/UI/AppKit/Application/ApplicationDelegate.mm b/UI/AppKit/Application/ApplicationDelegate.mm
index c5d960222847..5a966735d161 100644
--- a/UI/AppKit/Application/ApplicationDelegate.mm
+++ b/UI/AppKit/Application/ApplicationDelegate.mm
@@ -197,7 +197,7 @@ - (void)initializeTabController:(TabController*)controller
 - (void)closeCurrentTab:(id)sender
 {
     auto* current_window = [NSApp keyWindow];
-    [current_window close];
+    [current_window performClose:self];
 }
 
 - (void)clearHistory:(id)sender
diff --git a/UI/AppKit/Interface/LadybirdWebView.h b/UI/AppKit/Interface/LadybirdWebView.h
index 956b00f9143a..ccb457955581 100644
--- a/UI/AppKit/Interface/LadybirdWebView.h
+++ b/UI/AppKit/Interface/LadybirdWebView.h
@@ -63,4 +63,6 @@
 - (void)findInPageNextMatch;
 - (void)findInPagePreviousMatch;
 
+- (void)requestClose;
+
 @end
diff --git a/UI/AppKit/Interface/LadybirdWebView.mm b/UI/AppKit/Interface/LadybirdWebView.mm
index a7204e319179..d64a1b20d30f 100644
--- a/UI/AppKit/Interface/LadybirdWebView.mm
+++ b/UI/AppKit/Interface/LadybirdWebView.mm
@@ -204,6 +204,11 @@ - (void)findInPagePreviousMatch
     m_web_view_bridge->find_in_page_previous_match();
 }
 
+- (void)requestClose
+{
+    m_web_view_bridge->request_close();
+}
+
 #pragma mark - Private methods
 
 - (void)updateViewportRect
diff --git a/UI/AppKit/Interface/TabController.mm b/UI/AppKit/Interface/TabController.mm
index f99303dfa3ba..7ecf0cddd651 100644
--- a/UI/AppKit/Interface/TabController.mm
+++ b/UI/AppKit/Interface/TabController.mm
@@ -55,6 +55,8 @@ @interface TabController () <NSToolbarDelegate, NSSearchFieldDelegate, Autocompl
     OwnPtr<WebView::Autocomplete> m_autocomplete;
 }
 
+@property (nonatomic, assign) BOOL already_requested_close;
+
 @property (nonatomic, strong) Tab* parent;
 
 @property (nonatomic, strong) NSToolbar* toolbar;
@@ -397,6 +399,21 @@ - (void)windowDidBecomeMain:(NSNotification*)notification
     [delegate setActiveTab:[self tab]];
 }
 
+- (BOOL)windowShouldClose:(NSWindow*)sender
+{
+    // Prevent closing on first request so WebContent can cleanly shutdown (e.g. asking if the user is sure they want
+    // to leave, closing WebSocket connections, etc.)
+    if (!self.already_requested_close) {
+        self.already_requested_close = true;
+        [[[self tab] web_view] requestClose];
+        return false;
+    }
+
+    // If the user has already requested a close, then respect the user's request and just close the tab.
+    // For example, the WebContent process may not be responding.
+    return true;
+}
+
 - (void)windowWillClose:(NSNotification*)notification
 {
     auto* delegate = (ApplicationDelegate*)[NSApp delegate];
diff --git a/UI/Qt/BrowserWindow.cpp b/UI/Qt/BrowserWindow.cpp
index 8a32ba66368d..1ee8e735ee1c 100644
--- a/UI/Qt/BrowserWindow.cpp
+++ b/UI/Qt/BrowserWindow.cpp
@@ -237,8 +237,8 @@ BrowserWindow::BrowserWindow(Vector<URL::URL> const& initial_urls, IsPopupWindow
 
         set_current_tab(tab);
     });
-    QObject::connect(m_tabs_container, &QTabWidget::tabCloseRequested, this, &BrowserWindow::close_tab);
-    QObject::connect(close_current_tab_action, &QAction::triggered, this, &BrowserWindow::close_current_tab);
+    QObject::connect(m_tabs_container, &QTabWidget::tabCloseRequested, this, &BrowserWindow::request_to_close_tab);
+    QObject::connect(close_current_tab_action, &QAction::triggered, this, &BrowserWindow::request_to_close_current_tab);
 
     for (int i = 0; i <= 7; ++i) {
         new QShortcut(QKeySequence(Qt::CTRL | static_cast<Qt::Key>(Qt::Key_1 + i)), this, [this, i] {
@@ -378,7 +378,7 @@ void BrowserWindow::activate_tab(int index)
     m_tabs_container->setCurrentIndex(index);
 }
 
-void BrowserWindow::close_tab(int index)
+void BrowserWindow::definitely_close_tab(int index)
 {
     auto* tab = m_tabs_container->widget(index);
     m_tabs_container->removeTab(index);
@@ -398,9 +398,15 @@ void BrowserWindow::open_file()
     m_current_tab->open_file();
 }
 
-void BrowserWindow::close_current_tab()
+void BrowserWindow::request_to_close_tab(int index)
 {
-    close_tab(m_tabs_container->currentIndex());
+    auto* tab = as<Tab>(m_tabs_container->widget(index));
+    tab->request_close();
+}
+
+void BrowserWindow::request_to_close_current_tab()
+{
+    request_to_close_tab(m_tabs_container->currentIndex());
 }
 
 int BrowserWindow::tab_index(Tab* tab)
@@ -452,7 +458,7 @@ void BrowserWindow::create_close_button_for_tab(Tab* tab)
 
     connect(button, &QPushButton::clicked, this, [this, tab]() {
         auto index = m_tabs_container->indexOf(tab);
-        close_tab(index);
+        request_to_close_tab(index);
     });
 
     m_tabs_container->tabBar()->setTabButton(index, position, button);
@@ -625,7 +631,7 @@ bool BrowserWindow::eventFilter(QObject* obj, QEvent* event)
             if (obj == m_tabs_container) {
                 auto const tab_index = m_tabs_container->tabBar()->tabAt(mouse_event->pos());
                 if (tab_index != -1) {
-                    close_tab(tab_index);
+                    request_to_close_tab(tab_index);
                     return true;
                 }
             }
diff --git a/UI/Qt/BrowserWindow.h b/UI/Qt/BrowserWindow.h
index 0d79953523e3..362eb228df04 100644
--- a/UI/Qt/BrowserWindow.h
+++ b/UI/Qt/BrowserWindow.h
@@ -63,9 +63,10 @@ public slots:
     Tab& new_tab_from_url(URL::URL const&, Web::HTML::ActivateTab);
     Tab& new_child_tab(Web::HTML::ActivateTab, Tab& parent, Optional<u64> page_index);
     void activate_tab(int index);
-    void close_tab(int index);
+    void definitely_close_tab(int index);
     void move_tab(int old_index, int new_index);
-    void close_current_tab();
+    void request_to_close_tab(int index);
+    void request_to_close_current_tab();
     void open_next_tab();
     void open_previous_tab();
     void open_file();
diff --git a/UI/Qt/Tab.cpp b/UI/Qt/Tab.cpp
index ef4014aede27..adbc1d748a6c 100644
--- a/UI/Qt/Tab.cpp
+++ b/UI/Qt/Tab.cpp
@@ -115,7 +115,7 @@ Tab::Tab(BrowserWindow* window, RefPtr<WebView::WebContentClient> parent_client,
     };
 
     view().on_close = [this] {
-        m_window->close_tab(tab_index());
+        m_window->definitely_close_tab(tab_index());
     };
 
     view().on_link_hover = [this](auto const& url) {
@@ -374,20 +374,20 @@ Tab::Tab(BrowserWindow* window, RefPtr<WebView::WebContentClient> parent_client,
 
     auto* close_tab_action = new QAction("&Close Tab", this);
     QObject::connect(close_tab_action, &QAction::triggered, this, [this]() {
-        view().on_close();
+        request_close();
     });
 
     auto* close_tabs_to_left_action = new QAction("C&lose Tabs to Left", this);
     QObject::connect(close_tabs_to_left_action, &QAction::triggered, this, [this]() {
         for (auto i = tab_index() - 1; i >= 0; i--) {
-            m_window->close_tab(i);
+            m_window->request_to_close_tab(i);
         }
     });
 
     auto* close_tabs_to_right_action = new QAction("Close Tabs to R&ight", this);
     QObject::connect(close_tabs_to_right_action, &QAction::triggered, this, [this]() {
         for (auto i = m_window->tab_count() - 1; i > tab_index(); i--) {
-            m_window->close_tab(i);
+            m_window->request_to_close_tab(i);
         }
     });
 
@@ -397,7 +397,7 @@ Tab::Tab(BrowserWindow* window, RefPtr<WebView::WebContentClient> parent_client,
             if (i == tab_index())
                 continue;
 
-            m_window->close_tab(i);
+            m_window->request_to_close_tab(i);
         }
     });
 
@@ -513,4 +513,19 @@ void Tab::find_next()
     m_find_in_page->find_next();
 }
 
+void Tab::request_close()
+{
+    // Prevent closing on first request so WebContent can cleanly shutdown (e.g. asking if the user is sure they want
+    // to leave, closing WebSocket connections, etc.)
+    if (!m_already_requested_close) {
+        m_already_requested_close = true;
+        view().request_close();
+        return;
+    }
+
+    // If the user has already requested a close, then respect the user's request and just close the tab.
+    // For example, the WebContent process may not be responding.
+    m_window->definitely_close_tab(tab_index());
+}
+
 }
diff --git a/UI/Qt/Tab.h b/UI/Qt/Tab.h
index 5149fff2b235..88cf900cbbf3 100644
--- a/UI/Qt/Tab.h
+++ b/UI/Qt/Tab.h
@@ -61,6 +61,8 @@ class Tab final : public QWidget {
     void find_previous();
     void find_next();
 
+    void request_close();
+
     QIcon const& favicon() const { return m_favicon; }
     QString const& title() const { return m_title; }
 
@@ -113,6 +115,8 @@ public slots:
     QAction* m_reload_action { nullptr };
 
     QPointer<QDialog> m_dialog;
+
+    bool m_already_requested_close { false };
 };
 
 }