diff --git a/Userland/Libraries/LibWeb/CSS/Length.cpp b/Userland/Libraries/LibWeb/CSS/Length.cpp
index 7e6de34abf..68c7b65678 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Length.cpp
@@ -116,7 +116,7 @@ float Length::to_px(Layout::Node const& layout_node) const
 
     if (!layout_node.document().browsing_context())
         return 0;
-    auto const& viewport_rect = layout_node.document().browsing_context()->viewport_rect();
+    auto const& viewport_rect = layout_node.document().browsing_context()->viewport_rect().to_type<float>().to_type<int>();
     auto* root_element = layout_node.document().document_element();
     if (!root_element || !root_element->layout_node())
         return 0;
diff --git a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
index 109fa2da14..410d2ecc7e 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
@@ -1440,7 +1440,7 @@ void StyleComputer::invalidate_rule_cache()
 Gfx::IntRect StyleComputer::viewport_rect() const
 {
     if (auto const* browsing_context = document().browsing_context())
-        return browsing_context->viewport_rect();
+        return browsing_context->viewport_rect().to_type<float>().to_type<int>();
     return {};
 }
 
diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 710e8c1642..519f01d38f 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -833,7 +833,7 @@ void Document::update_layout()
     if (!browsing_context())
         return;
 
-    auto viewport_rect = browsing_context()->viewport_rect();
+    auto viewport_rect = browsing_context()->viewport_rect().to_type<float>();
 
     if (!m_layout_root) {
         m_next_layout_node_serial_id = 0;
@@ -1724,7 +1724,7 @@ void Document::run_the_resize_steps()
     if (!browsing_context())
         return;
 
-    auto viewport_size = browsing_context()->viewport_rect().size();
+    auto viewport_size = browsing_context()->viewport_rect().size().to_type<float>().to_type<int>();
     if (m_last_viewport_size == viewport_size)
         return;
     m_last_viewport_size = viewport_size;
diff --git a/Userland/Libraries/LibWeb/DOM/Element.cpp b/Userland/Libraries/LibWeb/DOM/Element.cpp
index 6962fea8d3..052b0ecdb5 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Element.cpp
@@ -664,7 +664,7 @@ int Element::client_width() const
     //    return the viewport width excluding the size of a rendered scroll bar (if any).
     if ((is<HTML::HTMLHtmlElement>(*this) && !document().in_quirks_mode())
         || (is<HTML::HTMLBodyElement>(*this) && document().in_quirks_mode())) {
-        return document().browsing_context()->viewport_rect().width();
+        return document().browsing_context()->viewport_rect().width().value();
     }
 
     // NOTE: Ensure that layout is up-to-date before looking at metrics.
@@ -689,7 +689,7 @@ int Element::client_height() const
     //    return the viewport height excluding the size of a rendered scroll bar (if any).
     if ((is<HTML::HTMLHtmlElement>(*this) && !document().in_quirks_mode())
         || (is<HTML::HTMLBodyElement>(*this) && document().in_quirks_mode())) {
-        return document().browsing_context()->viewport_rect().height();
+        return document().browsing_context()->viewport_rect().height().value();
     }
 
     // NOTE: Ensure that layout is up-to-date before looking at metrics.
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
index 67e136af2a..1cada0140c 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
@@ -316,7 +316,7 @@ void BrowsingContext::set_active_document(JS::NonnullGCPtr<DOM::Document> docume
         previously_active_document->did_stop_being_active_document_in_browsing_context({});
 }
 
-void BrowsingContext::set_viewport_rect(Gfx::IntRect const& rect)
+void BrowsingContext::set_viewport_rect(CSSPixelRect const& rect)
 {
     bool did_change = false;
 
@@ -345,7 +345,7 @@ void BrowsingContext::set_viewport_rect(Gfx::IntRect const& rect)
     HTML::main_thread_event_loop().schedule();
 }
 
-void BrowsingContext::set_size(Gfx::IntSize size)
+void BrowsingContext::set_size(CSSPixelSize size)
 {
     if (m_size == size)
         return;
@@ -368,14 +368,14 @@ void BrowsingContext::set_needs_display()
     set_needs_display(viewport_rect());
 }
 
-void BrowsingContext::set_needs_display(Gfx::IntRect const& rect)
+void BrowsingContext::set_needs_display(CSSPixelRect const& rect)
 {
     if (!viewport_rect().intersects(rect))
         return;
 
     if (is_top_level()) {
         if (m_page)
-            m_page->client().page_did_invalidate(to_top_level_rect(rect.to_type<CSSPixels>()));
+            m_page->client().page_did_invalidate(to_top_level_rect(rect));
         return;
     }
 
@@ -383,13 +383,13 @@ void BrowsingContext::set_needs_display(Gfx::IntRect const& rect)
         container()->layout_node()->set_needs_display();
 }
 
-void BrowsingContext::scroll_to(Gfx::IntPoint position)
+void BrowsingContext::scroll_to(CSSPixelPoint position)
 {
     if (active_document())
         active_document()->force_layout();
 
     if (m_page)
-        m_page->client().page_did_request_scroll_to(position.to_type<CSSPixels>());
+        m_page->client().page_did_request_scroll_to(position);
 }
 
 void BrowsingContext::scroll_to_anchor(DeprecatedString const& fragment)
@@ -419,15 +419,15 @@ void BrowsingContext::scroll_to_anchor(DeprecatedString const& fragment)
 
     auto& layout_node = *element->layout_node();
 
-    Gfx::FloatRect float_rect { layout_node.box_type_agnostic_position(), { (float)viewport_rect().width(), (float)viewport_rect().height() } };
+    CSSPixelRect target_rect { layout_node.box_type_agnostic_position(), { viewport_rect().width(), viewport_rect().height() } };
     if (is<Layout::Box>(layout_node)) {
         auto& layout_box = verify_cast<Layout::Box>(layout_node);
         auto padding_box = layout_box.box_model().padding_box();
-        float_rect.translate_by(-padding_box.left, -padding_box.top);
+        target_rect.translate_by(-padding_box.left, -padding_box.top);
     }
 
     if (m_page)
-        m_page->client().page_did_request_scroll_into_view(float_rect.to_type<CSSPixels>());
+        m_page->client().page_did_request_scroll_into_view(target_rect);
 }
 
 CSSPixelRect BrowsingContext::to_top_level_rect(CSSPixelRect const& a_rect)
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
index af6ccec47c..8332cdc5e6 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
@@ -108,7 +108,7 @@ public:
     class ViewportClient {
     public:
         virtual ~ViewportClient() = default;
-        virtual void browsing_context_did_set_viewport_rect(Gfx::IntRect const&) = 0;
+        virtual void browsing_context_did_set_viewport_rect(CSSPixelRect const&) = 0;
     };
     void register_viewport_client(ViewportClient&);
     void unregister_viewport_client(ViewportClient&);
@@ -134,15 +134,15 @@ public:
     Page* page() { return m_page; }
     Page const* page() const { return m_page; }
 
-    Gfx::IntSize size() const { return m_size; }
-    void set_size(Gfx::IntSize);
+    CSSPixelSize size() const { return m_size; }
+    void set_size(CSSPixelSize);
 
     void set_needs_display();
-    void set_needs_display(Gfx::IntRect const&);
+    void set_needs_display(CSSPixelRect const&);
 
-    Gfx::IntPoint viewport_scroll_offset() const { return m_viewport_scroll_offset; }
-    Gfx::IntRect viewport_rect() const { return { m_viewport_scroll_offset, m_size }; }
-    void set_viewport_rect(Gfx::IntRect const&);
+    CSSPixelPoint viewport_scroll_offset() const { return m_viewport_scroll_offset; }
+    CSSPixelRect viewport_rect() const { return { m_viewport_scroll_offset, m_size }; }
+    void set_viewport_rect(CSSPixelRect const&);
 
     FrameLoader& loader() { return m_loader; }
     FrameLoader const& loader() const { return m_loader; }
@@ -150,7 +150,7 @@ public:
     Web::EventHandler& event_handler() { return m_event_handler; }
     Web::EventHandler const& event_handler() const { return m_event_handler; }
 
-    void scroll_to(Gfx::IntPoint);
+    void scroll_to(CSSPixelPoint);
     void scroll_to_anchor(DeprecatedString const&);
 
     BrowsingContext& top_level_browsing_context()
@@ -297,8 +297,8 @@ private:
     Optional<HTML::Origin> m_creator_origin;
 
     JS::GCPtr<HTML::BrowsingContextContainer> m_container;
-    Gfx::IntSize m_size;
-    Gfx::IntPoint m_viewport_scroll_offset;
+    CSSPixelSize m_size;
+    CSSPixelPoint m_viewport_scroll_offset;
 
     // https://html.spec.whatwg.org/multipage/browsers.html#browsing-context
     JS::GCPtr<HTML::WindowProxy> m_window_proxy;
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index 8deed2b902..a32837627e 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -616,7 +616,7 @@ int Window::inner_width() const
     // The innerWidth attribute must return the viewport width including the size of a rendered scroll bar (if any),
     // or zero if there is no viewport.
     if (auto const* browsing_context = associated_document().browsing_context())
-        return browsing_context->viewport_rect().width();
+        return browsing_context->viewport_rect().width().value();
     return 0;
 }
 
@@ -626,7 +626,7 @@ int Window::inner_height() const
     // The innerHeight attribute must return the viewport height including the size of a rendered scroll bar (if any),
     // or zero if there is no viewport.
     if (auto const* browsing_context = associated_document().browsing_context())
-        return browsing_context->viewport_rect().height();
+        return browsing_context->viewport_rect().height().value();
     return 0;
 }
 
@@ -767,7 +767,7 @@ Optional<CSS::MediaFeatureValue> Window::query_media_feature(CSS::MediaFeatureID
 float Window::scroll_x() const
 {
     if (auto* page = this->page())
-        return page->top_level_browsing_context().viewport_scroll_offset().x();
+        return page->top_level_browsing_context().viewport_scroll_offset().x().value();
     return 0;
 }
 
@@ -775,7 +775,7 @@ float Window::scroll_x() const
 float Window::scroll_y() const
 {
     if (auto* page = this->page())
-        return page->top_level_browsing_context().viewport_scroll_offset().y();
+        return page->top_level_browsing_context().viewport_scroll_offset().y().value();
     return 0;
 }
 
@@ -823,7 +823,7 @@ int Window::screen_x() const
     // The screenX and screenLeft attributes must return the x-coordinate, relative to the origin of the Web-exposed screen area,
     // of the left of the client window as number of CSS pixels, or zero if there is no such thing.
     if (auto* page = this->page())
-        return page->window_position().x();
+        return page->window_position().x().value();
     return 0;
 }
 
@@ -833,7 +833,7 @@ int Window::screen_y() const
     // The screenY and screenTop attributes must return the y-coordinate, relative to the origin of the screen of the Web-exposed screen area,
     // of the top of the client window as number of CSS pixels, or zero if there is no such thing.
     if (auto* page = this->page())
-        return page->window_position().y();
+        return page->window_position().y().value();
     return 0;
 }
 
@@ -842,7 +842,7 @@ int Window::outer_width() const
 {
     // The outerWidth attribute must return the width of the client window. If there is no client window this attribute must return zero.
     if (auto* page = this->page())
-        return page->window_size().width();
+        return page->window_size().width().value();
     return 0;
 }
 
@@ -851,7 +851,7 @@ int Window::outer_height() const
 {
     // The outerHeight attribute must return the height of the client window. If there is no client window this attribute must return zero.
     if (auto* page = this->page())
-        return page->window_size().height();
+        return page->window_size().height().value();
     return 0;
 }
 
@@ -1703,7 +1703,7 @@ JS_DEFINE_NATIVE_FUNCTION(Window::scroll)
         return JS::js_undefined();
     auto& page = *impl->page();
 
-    auto viewport_rect = page.top_level_browsing_context().viewport_rect();
+    auto viewport_rect = page.top_level_browsing_context().viewport_rect().to_type<float>();
     auto x_value = JS::Value(viewport_rect.x());
     auto y_value = JS::Value(viewport_rect.y());
     DeprecatedString behavior_string = "auto";
@@ -1778,9 +1778,9 @@ JS_DEFINE_NATIVE_FUNCTION(Window::scroll_by)
     left = JS::Value(left).is_finite_number() ? left : 0.0;
     top = JS::Value(top).is_finite_number() ? top : 0.0;
 
-    auto current_scroll_position = page.top_level_browsing_context().viewport_scroll_offset();
-    left = left + current_scroll_position.x();
-    top = top + current_scroll_position.y();
+    auto current_scroll_position = page.top_level_browsing_context().viewport_scroll_offset().to_type<float>();
+    left = left + static_cast<double>(current_scroll_position.x());
+    top = top + static_cast<double>(current_scroll_position.y());
 
     auto behavior_string_value = TRY(options->get("behavior"));
     auto behavior_string = behavior_string_value.is_undefined() ? "auto" : TRY(behavior_string_value.to_string(vm));
diff --git a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
index 94d0fbc5bd..2e6a5231ca 100644
--- a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
@@ -676,7 +676,7 @@ static void measure_scrollable_overflow(LayoutState const& state, Box const& box
 
 void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_mode, AvailableSpace const& available_space)
 {
-    auto viewport_rect = root().browsing_context().viewport_rect();
+    auto viewport_rect = root().browsing_context().viewport_rect().to_type<float>();
 
     auto& icb = verify_cast<Layout::InitialContainingBlock>(root());
     auto& icb_state = m_state.get_mutable(icb);
diff --git a/Userland/Libraries/LibWeb/Layout/Box.cpp b/Userland/Libraries/LibWeb/Layout/Box.cpp
index 1583ff0fd1..a2ace652f8 100644
--- a/Userland/Libraries/LibWeb/Layout/Box.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Box.cpp
@@ -31,9 +31,8 @@ Box::~Box()
 
 void Box::set_needs_display()
 {
-    // FIXME: Make `set_needs_display` take CSSPixels
     if (paint_box())
-        browsing_context().set_needs_display(enclosing_int_rect(paint_box()->absolute_rect().to_type<float>()));
+        browsing_context().set_needs_display(paint_box()->absolute_rect());
 }
 
 bool Box::is_body() const
diff --git a/Userland/Libraries/LibWeb/Layout/FrameBox.cpp b/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
index a761ff2974..1285ccfac0 100644
--- a/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
@@ -33,8 +33,7 @@ void FrameBox::did_set_rect()
     ReplacedBox::did_set_rect();
 
     VERIFY(dom_node().nested_browsing_context());
-    // FIXME: Pass CSSPixels here instead of int.
-    dom_node().nested_browsing_context()->set_size(paint_box()->content_size().to_type<float>().to_type<int>());
+    dom_node().nested_browsing_context()->set_size(paint_box()->content_size());
 }
 
 RefPtr<Painting::Paintable> FrameBox::create_paintable() const
diff --git a/Userland/Libraries/LibWeb/Layout/ImageBox.cpp b/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
index dcf195015f..9108f366eb 100644
--- a/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
@@ -92,9 +92,9 @@ bool ImageBox::renders_as_alt_text() const
     return false;
 }
 
-void ImageBox::browsing_context_did_set_viewport_rect(Gfx::IntRect const& viewport_rect)
+void ImageBox::browsing_context_did_set_viewport_rect(CSSPixelRect const& viewport_rect)
 {
-    m_image_loader.set_visible_in_viewport(paint_box() && viewport_rect.to_type<CSSPixels>().intersects(paint_box()->absolute_rect()));
+    m_image_loader.set_visible_in_viewport(paint_box() && viewport_rect.intersects(paint_box()->absolute_rect()));
 }
 
 RefPtr<Painting::Paintable> ImageBox::create_paintable() const
diff --git a/Userland/Libraries/LibWeb/Layout/ImageBox.h b/Userland/Libraries/LibWeb/Layout/ImageBox.h
index a3b0164d9a..a6a78060ea 100644
--- a/Userland/Libraries/LibWeb/Layout/ImageBox.h
+++ b/Userland/Libraries/LibWeb/Layout/ImageBox.h
@@ -35,7 +35,7 @@ public:
 
 private:
     // ^BrowsingContext::ViewportClient
-    virtual void browsing_context_did_set_viewport_rect(Gfx::IntRect const&) final;
+    virtual void browsing_context_did_set_viewport_rect(CSSPixelRect const&) final;
 
     // ^JS::Cell
     virtual void finalize() override;
diff --git a/Userland/Libraries/LibWeb/Layout/Node.cpp b/Userland/Libraries/LibWeb/Layout/Node.cpp
index 6f40664376..e84ec72499 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Node.cpp
@@ -158,7 +158,7 @@ void Node::set_needs_display()
         return;
     containing_block->paint_box()->for_each_fragment([&](auto& fragment) {
         if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
-            browsing_context().set_needs_display(fragment.absolute_rect().template to_type<float>().template to_type<int>());
+            browsing_context().set_needs_display(fragment.absolute_rect());
         }
         return IterationDecision::Continue;
     });
diff --git a/Userland/Libraries/LibWeb/Page/EventHandler.cpp b/Userland/Libraries/LibWeb/Page/EventHandler.cpp
index e19079c1a9..db3e89aa4c 100644
--- a/Userland/Libraries/LibWeb/Page/EventHandler.cpp
+++ b/Userland/Libraries/LibWeb/Page/EventHandler.cpp
@@ -799,7 +799,7 @@ CSSPixelPoint EventHandler::compute_mouse_event_client_offset(CSSPixelPoint even
     // The clientX attribute must return the x-coordinate of the position where the event occurred relative to the origin of the viewport.
 
     auto scroll_offset = m_browsing_context.viewport_scroll_offset();
-    return event_page_position.translated(-scroll_offset.to_rounded<CSSPixels>());
+    return event_page_position.translated(-scroll_offset);
 }
 
 CSSPixelPoint EventHandler::compute_mouse_event_page_offset(CSSPixelPoint event_client_offset) const
@@ -811,6 +811,6 @@ CSSPixelPoint EventHandler::compute_mouse_event_page_offset(CSSPixelPoint event_
     auto scroll_offset = m_browsing_context.viewport_scroll_offset();
 
     // 3. Return the sum of offset and the value of the event’s clientX attribute.
-    return event_client_offset.translated(scroll_offset.to_rounded<CSSPixels>());
+    return event_client_offset.translated(scroll_offset);
 }
 }
diff --git a/Userland/Libraries/LibWeb/Page/Page.h b/Userland/Libraries/LibWeb/Page/Page.h
index d958775373..ceaddf0548 100644
--- a/Userland/Libraries/LibWeb/Page/Page.h
+++ b/Userland/Libraries/LibWeb/Page/Page.h
@@ -87,11 +87,11 @@ public:
     bool is_webdriver_active() const { return m_is_webdriver_active; }
     void set_is_webdriver_active(bool b) { m_is_webdriver_active = b; }
 
-    Gfx::IntPoint window_position() const { return m_window_position; }
-    void set_window_position(Gfx::IntPoint position) { m_window_position = position; }
+    DevicePixelPoint window_position() const { return m_window_position; }
+    void set_window_position(DevicePixelPoint position) { m_window_position = position; }
 
-    Gfx::IntSize window_size() const { return m_window_size; }
-    void set_window_size(Gfx::IntSize size) { m_window_size = size; }
+    DevicePixelSize window_size() const { return m_window_size; }
+    void set_window_size(DevicePixelSize size) { m_window_size = size; }
 
     void did_request_alert(DeprecatedString const& message);
     void alert_closed();
@@ -131,8 +131,8 @@ private:
     // The webdriver-active flag is set to true when the user agent is under remote control. It is initially false.
     bool m_is_webdriver_active { false };
 
-    Gfx::IntPoint m_window_position {};
-    Gfx::IntSize m_window_size {};
+    DevicePixelPoint m_window_position {};
+    DevicePixelSize m_window_size {};
 
     PendingDialog m_pending_dialog { PendingDialog::None };
     Optional<DeprecatedString> m_pending_dialog_text;
diff --git a/Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp b/Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
index f7cf17d61c..d9fc0ba370 100644
--- a/Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
+++ b/Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
@@ -128,7 +128,7 @@ void paint_background(PaintContext& context, Layout::NodeWithStyleAndBoxModelMet
         // Attachment and Origin
         switch (layer.attachment) {
         case CSS::BackgroundAttachment::Fixed:
-            background_positioning_area = layout_node.root().browsing_context().viewport_rect().to_type<CSSPixels>();
+            background_positioning_area = layout_node.root().browsing_context().viewport_rect();
             break;
         case CSS::BackgroundAttachment::Local:
         case CSS::BackgroundAttachment::Scroll:
diff --git a/Userland/Libraries/LibWeb/Painting/NestedBrowsingContextPaintable.cpp b/Userland/Libraries/LibWeb/Painting/NestedBrowsingContextPaintable.cpp
index 3c19b5a2a3..7db227ba02 100644
--- a/Userland/Libraries/LibWeb/Painting/NestedBrowsingContextPaintable.cpp
+++ b/Userland/Libraries/LibWeb/Painting/NestedBrowsingContextPaintable.cpp
@@ -53,7 +53,7 @@ void NestedBrowsingContextPaintable::paint(PaintContext& context, PaintPhase pha
         context.painter().add_clip_rect(clip_rect.to_type<int>());
         context.painter().translate(absolute_rect.x().value(), absolute_rect.y().value());
 
-        context.set_device_viewport_rect({ {}, layout_box().dom_node().nested_browsing_context()->size() });
+        context.set_device_viewport_rect({ {}, context.enclosing_device_size(layout_box().dom_node().nested_browsing_context()->size()) });
         const_cast<Layout::InitialContainingBlock*>(hosted_layout_tree)->paint_all_phases(context);
 
         context.set_device_viewport_rect(old_viewport_rect);
diff --git a/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp b/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
index 40cfada4bd..249074f432 100644
--- a/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
+++ b/Userland/Libraries/LibWeb/WebDriver/Screenshot.cpp
@@ -55,7 +55,7 @@ Response capture_element_screenshot(Painter const& painter, Page& page, DOM::Ele
 
     element.document().window().animation_frame_callback_driver().add([&](auto) {
         auto viewport_rect = page.top_level_browsing_context().viewport_rect();
-        rect.intersect(viewport_rect);
+        rect.intersect(page.enclosing_device_rect(viewport_rect).to_type<int>());
 
         auto canvas_element = DOM::create_element(element.document(), HTML::TagNames::canvas, Namespace::HTML);
         auto& canvas = verify_cast<HTML::HTMLCanvasElement>(*canvas_element);
diff --git a/Userland/Services/WebContent/ConnectionFromClient.cpp b/Userland/Services/WebContent/ConnectionFromClient.cpp
index 8032dd58d9..b2e664667e 100644
--- a/Userland/Services/WebContent/ConnectionFromClient.cpp
+++ b/Userland/Services/WebContent/ConnectionFromClient.cpp
@@ -112,7 +112,7 @@ void ConnectionFromClient::load_html(DeprecatedString const& html, const URL& ur
 void ConnectionFromClient::set_viewport_rect(Gfx::IntRect const& rect)
 {
     dbgln_if(SPAM_DEBUG, "handle: WebContentServer::SetViewportRect: rect={}", rect);
-    m_page_host->set_viewport_rect(rect);
+    m_page_host->set_viewport_rect(rect.to_type<Web::DevicePixels>());
 }
 
 void ConnectionFromClient::add_backing_store(i32 backing_store_id, Gfx::ShareableBitmap const& bitmap)
@@ -532,12 +532,12 @@ void ConnectionFromClient::set_is_scripting_enabled(bool is_scripting_enabled)
 
 void ConnectionFromClient::set_window_position(Gfx::IntPoint position)
 {
-    m_page_host->set_window_position(position);
+    m_page_host->set_window_position(position.to_type<Web::DevicePixels>());
 }
 
 void ConnectionFromClient::set_window_size(Gfx::IntSize size)
 {
-    m_page_host->set_window_size(size);
+    m_page_host->set_window_size(size.to_type<Web::DevicePixels>());
 }
 
 Messages::WebContentServer::GetLocalStorageEntriesResponse ConnectionFromClient::get_local_storage_entries()
diff --git a/Userland/Services/WebContent/PageHost.cpp b/Userland/Services/WebContent/PageHost.cpp
index 3134ece247..d64d893206 100644
--- a/Userland/Services/WebContent/PageHost.cpp
+++ b/Userland/Services/WebContent/PageHost.cpp
@@ -79,12 +79,12 @@ void PageHost::set_is_scripting_enabled(bool is_scripting_enabled)
     page().set_is_scripting_enabled(is_scripting_enabled);
 }
 
-void PageHost::set_window_position(Gfx::IntPoint position)
+void PageHost::set_window_position(Web::DevicePixelPoint position)
 {
     page().set_window_position(position);
 }
 
-void PageHost::set_window_size(Gfx::IntSize size)
+void PageHost::set_window_size(Web::DevicePixelSize size)
 {
     page().set_window_size(size);
 }
@@ -125,9 +125,9 @@ void PageHost::paint(Web::DevicePixelRect const& content_rect, Gfx::Bitmap& targ
     layout_root->paint_all_phases(context);
 }
 
-void PageHost::set_viewport_rect(Gfx::IntRect const& rect)
+void PageHost::set_viewport_rect(Web::DevicePixelRect const& rect)
 {
-    page().top_level_browsing_context().set_viewport_rect(rect);
+    page().top_level_browsing_context().set_viewport_rect(page().device_to_css_rect(rect));
 }
 
 void PageHost::page_did_invalidate(Web::CSSPixelRect const& content_rect)
diff --git a/Userland/Services/WebContent/PageHost.h b/Userland/Services/WebContent/PageHost.h
index fb0054226d..1950b4635c 100644
--- a/Userland/Services/WebContent/PageHost.h
+++ b/Userland/Services/WebContent/PageHost.h
@@ -30,15 +30,15 @@ public:
     virtual void paint(Web::DevicePixelRect const& content_rect, Gfx::Bitmap&) override;
 
     void set_palette_impl(Gfx::PaletteImpl const&);
-    void set_viewport_rect(Gfx::IntRect const&);
+    void set_viewport_rect(Web::DevicePixelRect const&);
     void set_screen_rects(Vector<Gfx::IntRect, 4> const& rects, size_t main_screen_index) { m_screen_rect = rects[main_screen_index].to_type<Web::DevicePixels>(); }
     void set_screen_display_scale(float device_pixels_per_css_pixel) { m_screen_display_scale = device_pixels_per_css_pixel; }
     void set_preferred_color_scheme(Web::CSS::PreferredColorScheme);
     void set_should_show_line_box_borders(bool b) { m_should_show_line_box_borders = b; }
     void set_has_focus(bool);
     void set_is_scripting_enabled(bool);
-    void set_window_position(Gfx::IntPoint);
-    void set_window_size(Gfx::IntSize);
+    void set_window_position(Web::DevicePixelPoint);
+    void set_window_size(Web::DevicePixelSize);
 
     Web::DevicePixelSize content_size() const { return m_content_size; }
 
diff --git a/Userland/Services/WebContent/WebDriverConnection.cpp b/Userland/Services/WebContent/WebDriverConnection.cpp
index 04a63f1b1b..b30b26d91b 100644
--- a/Userland/Services/WebContent/WebDriverConnection.cpp
+++ b/Userland/Services/WebContent/WebDriverConnection.cpp
@@ -606,7 +606,7 @@ Messages::WebDriverClient::SetWindowRectResponse WebDriverConnection::set_window
         auto size = m_page_client.page_did_request_resize_window({ *width, *height });
         window_rect.set_size(size);
     } else {
-        window_rect.set_size(m_page_client.page().window_size());
+        window_rect.set_size(m_page_client.page().window_size().to_type<int>());
     }
 
     // 12. If x and y are not null:
@@ -615,7 +615,7 @@ Messages::WebDriverClient::SetWindowRectResponse WebDriverConnection::set_window
         auto position = m_page_client.page_did_request_reposition_window({ *x, *y });
         window_rect.set_location(position);
     } else {
-        window_rect.set_location(m_page_client.page().window_position());
+        window_rect.set_location(m_page_client.page().window_position().to_type<int>());
     }
 
     // 14. Return success with data set to the WindowRect object for the current top-level browsing context.
diff --git a/Userland/Utilities/headless-browser.cpp b/Userland/Utilities/headless-browser.cpp
index 436f3c4a9e..f0e8834d0a 100644
--- a/Userland/Utilities/headless-browser.cpp
+++ b/Userland/Utilities/headless-browser.cpp
@@ -101,7 +101,7 @@ public:
 
     void set_viewport_rect(Gfx::IntRect viewport_rect)
     {
-        page().top_level_browsing_context().set_viewport_rect(viewport_rect);
+        page().top_level_browsing_context().set_viewport_rect(page().device_to_css_rect(viewport_rect.to_type<Web::DevicePixels>()));
     }
 
     void set_screen_rect(Web::DevicePixelRect screen_rect)