diff --git a/Libraries/LibWeb/DOM/Window.cpp b/Libraries/LibWeb/DOM/Window.cpp
index 35a3fa3786..7799b00837 100644
--- a/Libraries/LibWeb/DOM/Window.cpp
+++ b/Libraries/LibWeb/DOM/Window.cpp
@@ -57,7 +57,9 @@ void Window::set_wrapper(Badge<Bindings::WindowObject>, Bindings::WindowObject&
 
 void Window::alert(const String& message)
 {
-    GUI::MessageBox::show(nullptr, message, "Alert", GUI::MessageBox::Type::Information);
+    if (!m_document.frame())
+        return;
+    m_document.frame()->page().client().page_did_request_alert(message);
 }
 
 bool Window::confirm(const String& message)
diff --git a/Libraries/LibWeb/InProcessWebView.cpp b/Libraries/LibWeb/InProcessWebView.cpp
index 34896db864..9333ae2d08 100644
--- a/Libraries/LibWeb/InProcessWebView.cpp
+++ b/Libraries/LibWeb/InProcessWebView.cpp
@@ -31,6 +31,7 @@
 #include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/Clipboard.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
 #include <LibGUI/ScrollBar.h>
 #include <LibGUI/Window.h>
@@ -43,6 +44,7 @@
 #include <LibWeb/HTML/HTMLAnchorElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/HTML/Parser/HTMLDocumentParser.h>
+#include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Layout/LayoutBreak.h>
 #include <LibWeb/Layout/LayoutDocument.h>
 #include <LibWeb/Layout/LayoutNode.h>
@@ -50,7 +52,6 @@
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/Page/EventHandler.h>
 #include <LibWeb/Page/Frame.h>
-#include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Painting/PaintContext.h>
 #include <LibWeb/UIEvents/MouseEvent.h>
 #include <stdio.h>
@@ -416,4 +417,9 @@ void InProcessWebView::drop_event(GUI::DropEvent& event)
     ScrollableWidget::drop_event(event);
 }
 
+void InProcessWebView::page_did_request_alert(const String& message)
+{
+    GUI::MessageBox::show(window(), message, "Alert", GUI::MessageBox::Type::Information);
+}
+
 }
diff --git a/Libraries/LibWeb/InProcessWebView.h b/Libraries/LibWeb/InProcessWebView.h
index 544079d1d8..c6931936dc 100644
--- a/Libraries/LibWeb/InProcessWebView.h
+++ b/Libraries/LibWeb/InProcessWebView.h
@@ -104,6 +104,7 @@ private:
     virtual void page_did_change_favicon(const Gfx::Bitmap&) override;
     virtual void page_did_layout() override;
     virtual void page_did_request_scroll_into_view(const Gfx::IntRect&) override;
+    virtual void page_did_request_alert(const String&) override;
 
     void layout_and_sync_size();
 
diff --git a/Libraries/LibWeb/OutOfProcessWebView.cpp b/Libraries/LibWeb/OutOfProcessWebView.cpp
index 3fe4b19052..22cdcaf51f 100644
--- a/Libraries/LibWeb/OutOfProcessWebView.cpp
+++ b/Libraries/LibWeb/OutOfProcessWebView.cpp
@@ -27,6 +27,7 @@
 #include "OutOfProcessWebView.h"
 #include "WebContentClient.h"
 #include <AK/SharedBuffer.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
 #include <LibGUI/ScrollBar.h>
 #include <LibGUI/Window.h>
@@ -179,6 +180,11 @@ void OutOfProcessWebView::notify_server_did_request_link_context_menu(Badge<WebC
         on_link_context_menu_request(url, screen_relative_rect().location().translated(to_widget_position(content_position)));
 }
 
+void OutOfProcessWebView::notify_server_did_request_alert(Badge<WebContentClient>, const String& message)
+{
+    GUI::MessageBox::show(window(), message, "Alert", GUI::MessageBox::Type::Information);
+}
+
 void OutOfProcessWebView::did_scroll()
 {
     client().post_message(Messages::WebContentServer::SetViewportRect(visible_content_rect()));
diff --git a/Libraries/LibWeb/OutOfProcessWebView.h b/Libraries/LibWeb/OutOfProcessWebView.h
index bdde1f7cff..47cf0f497c 100644
--- a/Libraries/LibWeb/OutOfProcessWebView.h
+++ b/Libraries/LibWeb/OutOfProcessWebView.h
@@ -59,6 +59,7 @@ public:
     void notify_server_did_start_loading(Badge<WebContentClient>, const URL&);
     void notify_server_did_request_context_menu(Badge<WebContentClient>, const Gfx::IntPoint&);
     void notify_server_did_request_link_context_menu(Badge<WebContentClient>, const Gfx::IntPoint&, const URL&, const String& target, unsigned modifiers);
+    void notify_server_did_request_alert(Badge<WebContentClient>, const String& message);
 
 private:
     OutOfProcessWebView();
diff --git a/Libraries/LibWeb/Page/Page.h b/Libraries/LibWeb/Page/Page.h
index 1af2fec572..0cbb992994 100644
--- a/Libraries/LibWeb/Page/Page.h
+++ b/Libraries/LibWeb/Page/Page.h
@@ -95,6 +95,7 @@ public:
     virtual void page_did_change_favicon(const Gfx::Bitmap&) { }
     virtual void page_did_layout() { }
     virtual void page_did_request_scroll_into_view(const Gfx::IntRect&) { }
+    virtual void page_did_request_alert(const String&) { }
 };
 
 }
diff --git a/Libraries/LibWeb/WebContentClient.cpp b/Libraries/LibWeb/WebContentClient.cpp
index 74c2be6959..5a679ab068 100644
--- a/Libraries/LibWeb/WebContentClient.cpp
+++ b/Libraries/LibWeb/WebContentClient.cpp
@@ -142,4 +142,10 @@ void WebContentClient::handle(const Messages::WebContentClient::DidRequestLinkCo
     m_view.notify_server_did_request_link_context_menu({}, message.content_position(), message.url(), message.target(), message.modifiers());
 }
 
+OwnPtr<Messages::WebContentClient::DidRequestAlertResponse> WebContentClient::handle(const Messages::WebContentClient::DidRequestAlert& message)
+{
+    m_view.notify_server_did_request_alert({}, message.message());
+    return make<Messages::WebContentClient::DidRequestAlertResponse>();
+}
+
 }
diff --git a/Libraries/LibWeb/WebContentClient.h b/Libraries/LibWeb/WebContentClient.h
index 7357f09375..c712b193b7 100644
--- a/Libraries/LibWeb/WebContentClient.h
+++ b/Libraries/LibWeb/WebContentClient.h
@@ -60,6 +60,7 @@ private:
     virtual void handle(const Messages::WebContentClient::DidStartLoading&) override;
     virtual void handle(const Messages::WebContentClient::DidRequestContextMenu&) override;
     virtual void handle(const Messages::WebContentClient::DidRequestLinkContextMenu&) override;
+    virtual OwnPtr<Messages::WebContentClient::DidRequestAlertResponse> handle(const Messages::WebContentClient::DidRequestAlert&) override;
 
     OutOfProcessWebView& m_view;
 };
diff --git a/Services/WebContent/PageHost.cpp b/Services/WebContent/PageHost.cpp
index c0a2e82e92..90c763d16a 100644
--- a/Services/WebContent/PageHost.cpp
+++ b/Services/WebContent/PageHost.cpp
@@ -169,4 +169,9 @@ void PageHost::page_did_request_link_context_menu(const Gfx::IntPoint& content_p
     m_client.post_message(Messages::WebContentClient::DidRequestLinkContextMenu(content_position, url, target, modifiers));
 }
 
+void PageHost::page_did_request_alert(const String& message)
+{
+    m_client.send_sync<Messages::WebContentClient::DidRequestAlert>(message);
+}
+
 }
diff --git a/Services/WebContent/PageHost.h b/Services/WebContent/PageHost.h
index fc48da1359..6e3a9ec68e 100644
--- a/Services/WebContent/PageHost.h
+++ b/Services/WebContent/PageHost.h
@@ -63,6 +63,7 @@ private:
     virtual void page_did_request_context_menu(const Gfx::IntPoint&) override;
     virtual void page_did_request_link_context_menu(const Gfx::IntPoint&, const URL&, const String& target, unsigned modifiers) override;
     virtual void page_did_start_loading(const URL&) override;
+    virtual void page_did_request_alert(const String&) override;
 
     explicit PageHost(ClientConnection&);
 
diff --git a/Services/WebContent/WebContentClient.ipc b/Services/WebContent/WebContentClient.ipc
index 6778d2eda5..2b88944cfd 100644
--- a/Services/WebContent/WebContentClient.ipc
+++ b/Services/WebContent/WebContentClient.ipc
@@ -14,4 +14,5 @@ endpoint WebContentClient = 90
     DidStartLoading(URL url) =|
     DidRequestContextMenu(Gfx::IntPoint content_position) =|
     DidRequestLinkContextMenu(Gfx::IntPoint content_position, URL url, String target, unsigned modifiers) =|
+    DidRequestAlert(String message) => ()
 }