From 4190fd219930a6c8b631c396ccafe5190f821414 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 30 May 2021 12:36:53 +0200
Subject: [PATCH] LibWeb: Rename Web::Frame to Web::BrowsingContext

Our "frame" concept very closely matches what the web specs call a
"browsing context", so let's rename it to that. :^)

The "main frame" becomes the "top-level browsing context",
and "sub-frames" are now "nested browsing contexts".
---
 Userland/Applications/Browser/Tab.cpp         |  2 +-
 .../LibWeb/Bindings/WindowObject.cpp          | 22 +++---
 Userland/Libraries/LibWeb/CMakeLists.txt      |  2 +-
 Userland/Libraries/LibWeb/CSS/Length.cpp      | 10 +--
 Userland/Libraries/LibWeb/CSS/StyleValue.cpp  |  6 +-
 Userland/Libraries/LibWeb/DOM/Document.cpp    | 22 +++---
 Userland/Libraries/LibWeb/DOM/Document.h      | 10 +--
 Userland/Libraries/LibWeb/DOM/Window.cpp      |  6 +-
 Userland/Libraries/LibWeb/Forward.h           |  2 +-
 .../LibWeb/HTML/FrameHostElement.cpp          | 18 ++---
 .../Libraries/LibWeb/HTML/FrameHostElement.h  |  8 +-
 .../Libraries/LibWeb/HTML/HTMLFormElement.cpp |  2 +-
 .../LibWeb/HTML/HTMLIFrameElement.cpp         |  6 +-
 .../LibWeb/HTML/HTMLInputElement.cpp          |  2 +-
 .../LibWeb/HTML/HTMLTitleElement.cpp          |  2 +-
 .../Libraries/LibWeb/InProcessWebView.cpp     | 30 ++++----
 Userland/Libraries/LibWeb/InProcessWebView.h  |  2 +-
 .../LibWeb/Layout/BlockFormattingContext.cpp  |  4 +-
 Userland/Libraries/LibWeb/Layout/Box.cpp      |  4 +-
 .../Libraries/LibWeb/Layout/ButtonBox.cpp     |  8 +-
 Userland/Libraries/LibWeb/Layout/CheckBox.cpp |  6 +-
 Userland/Libraries/LibWeb/Layout/FrameBox.cpp | 12 +--
 Userland/Libraries/LibWeb/Layout/ImageBox.cpp |  6 +-
 Userland/Libraries/LibWeb/Layout/ImageBox.h   |  4 +-
 .../Layout/InitialContainingBlockBox.cpp      |  2 +-
 Userland/Libraries/LibWeb/Layout/Label.cpp    |  2 +-
 Userland/Libraries/LibWeb/Layout/Node.cpp     | 16 ++--
 Userland/Libraries/LibWeb/Layout/Node.h       |  4 +-
 .../Libraries/LibWeb/Layout/RadioButton.cpp   |  6 +-
 .../LibWeb/Layout/TableFormattingContext.cpp  |  2 +-
 Userland/Libraries/LibWeb/Layout/TextNode.cpp | 16 ++--
 .../Libraries/LibWeb/Loader/FrameLoader.cpp   | 28 +++----
 .../Libraries/LibWeb/Loader/FrameLoader.h     |  8 +-
 .../Page/{Frame.cpp => BrowsingContext.cpp}   | 74 +++++++++----------
 .../Page/{Frame.h => BrowsingContext.h}       | 26 +++----
 .../LibWeb/Page/EditEventHandler.cpp          |  2 +-
 .../Libraries/LibWeb/Page/EditEventHandler.h  |  4 +-
 .../Libraries/LibWeb/Page/EventHandler.cpp    | 22 +++---
 Userland/Libraries/LibWeb/Page/EventHandler.h |  6 +-
 Userland/Libraries/LibWeb/Page/Page.cpp       | 32 ++++----
 Userland/Libraries/LibWeb/Page/Page.h         | 16 ++--
 .../Services/WebContent/ClientConnection.cpp  | 14 ++--
 Userland/Services/WebContent/PageHost.cpp     |  6 +-
 43 files changed, 241 insertions(+), 241 deletions(-)
 rename Userland/Libraries/LibWeb/Page/{Frame.cpp => BrowsingContext.cpp} (77%)
 rename Userland/Libraries/LibWeb/Page/{Frame.h => BrowsingContext.h} (74%)

diff --git a/Userland/Applications/Browser/Tab.cpp b/Userland/Applications/Browser/Tab.cpp
index 3a47c87aa6..dd61bd7d6b 100644
--- a/Userland/Applications/Browser/Tab.cpp
+++ b/Userland/Applications/Browser/Tab.cpp
@@ -31,7 +31,7 @@
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/OutOfProcessWebView.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Browser {
 
diff --git a/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp b/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
index 13d28f3591..4d85f0a6b6 100644
--- a/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
@@ -26,7 +26,7 @@
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/DOM/Window.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/WebAssembly/WebAssemblyObject.h>
 
 #include <LibWeb/Bindings/WindowObjectHelper.h>
@@ -344,10 +344,10 @@ JS_DEFINE_NATIVE_GETTER(WindowObject::top_getter)
     auto* impl = impl_from(vm, global_object);
     if (!impl)
         return {};
-    auto* this_frame = impl->document().frame();
-    VERIFY(this_frame);
-    VERIFY(this_frame->main_frame().document());
-    auto& top_window = this_frame->main_frame().document()->window();
+    auto* this_browsing_context = impl->document().browsing_context();
+    VERIFY(this_browsing_context);
+    VERIFY(this_browsing_context->top_level_browsing_context().document());
+    auto& top_window = this_browsing_context->top_level_browsing_context().document()->window();
     return top_window.wrapper();
 }
 
@@ -356,14 +356,14 @@ JS_DEFINE_NATIVE_GETTER(WindowObject::parent_getter)
     auto* impl = impl_from(vm, global_object);
     if (!impl)
         return {};
-    auto* this_frame = impl->document().frame();
-    VERIFY(this_frame);
-    if (this_frame->parent()) {
-        VERIFY(this_frame->parent()->document());
-        auto& parent_window = this_frame->parent()->document()->window();
+    auto* this_browsing_context = impl->document().browsing_context();
+    VERIFY(this_browsing_context);
+    if (this_browsing_context->parent()) {
+        VERIFY(this_browsing_context->parent()->document());
+        auto& parent_window = this_browsing_context->parent()->document()->window();
         return parent_window.wrapper();
     }
-    VERIFY(this_frame == &this_frame->main_frame());
+    VERIFY(this_browsing_context == &this_browsing_context->top_level_browsing_context());
     return impl->wrapper();
 }
 
diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index bc9123ed83..4649f46f0c 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -205,9 +205,9 @@ set(SOURCES
     Namespace.cpp
     NavigationTiming/PerformanceTiming.cpp
     OutOfProcessWebView.cpp
+    Page/BrowsingContext.cpp
     Page/EditEventHandler.cpp
     Page/EventHandler.cpp
-    Page/Frame.cpp
     Page/Page.cpp
     Painting/BorderPainting.cpp
     Painting/StackingContext.cpp
diff --git a/Userland/Libraries/LibWeb/CSS/Length.cpp b/Userland/Libraries/LibWeb/CSS/Length.cpp
index 18558e126d..6d19c06aee 100644
--- a/Userland/Libraries/LibWeb/CSS/Length.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Length.cpp
@@ -7,7 +7,7 @@
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLHtmlElement.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::CSS {
 
@@ -21,16 +21,16 @@ float Length::relative_length_to_px(const Layout::Node& layout_node) const
     case Type::Rem:
         return m_value * layout_node.document().document_element()->layout_node()->font_size();
     case Type::Vw:
-        return layout_node.document().frame()->viewport_rect().width() * (m_value / 100);
+        return layout_node.document().browsing_context()->viewport_rect().width() * (m_value / 100);
     case Type::Vh:
-        return layout_node.document().frame()->viewport_rect().height() * (m_value / 100);
+        return layout_node.document().browsing_context()->viewport_rect().height() * (m_value / 100);
     case Type::Vmin: {
-        auto viewport = layout_node.document().frame()->viewport_rect();
+        auto viewport = layout_node.document().browsing_context()->viewport_rect();
 
         return min(viewport.width(), viewport.height()) * (m_value / 100);
     }
     case Type::Vmax: {
-        auto viewport = layout_node.document().frame()->viewport_rect();
+        auto viewport = layout_node.document().browsing_context()->viewport_rect();
 
         return max(viewport.width(), viewport.height()) * (m_value / 100);
     }
diff --git a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
index 96ee5c5304..7d85f56227 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleValue.cpp
@@ -11,7 +11,7 @@
 #include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Loader/LoadRequest.h>
 #include <LibWeb/Loader/ResourceLoader.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::CSS {
 
@@ -165,8 +165,8 @@ void ImageStyleValue::resource_did_load()
         return;
     m_bitmap = resource()->bitmap();
     // FIXME: Do less than a full repaint if possible?
-    if (m_document->frame())
-        m_document->frame()->set_needs_display({});
+    if (m_document->browsing_context())
+        m_document->browsing_context()->set_needs_display({});
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 5307657753..b9887a8553 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -50,7 +50,7 @@
 #include <LibWeb/Layout/TreeBuilder.h>
 #include <LibWeb/Namespace.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/SVG/TagNames.h>
 #include <LibWeb/UIEvents/MouseEvent.h>
 #include <ctype.h>
@@ -281,22 +281,22 @@ void Document::set_title(const String& title)
     title_element->append_child(adopt_ref(*new Text(*this, title)));
 
     if (auto* page = this->page()) {
-        if (frame() == &page->main_frame())
+        if (browsing_context() == &page->top_level_browsing_context())
             page->client().page_did_change_title(title);
     }
 }
 
-void Document::attach_to_frame(Badge<Frame>, Frame& frame)
+void Document::attach_to_browsing_context(Badge<BrowsingContext>, BrowsingContext& browsing_context)
 {
-    m_frame = frame;
+    m_browsing_context = browsing_context;
     update_layout();
 }
 
-void Document::detach_from_frame(Badge<Frame>, Frame& frame)
+void Document::detach_from_browsing_context(Badge<BrowsingContext>, BrowsingContext& browsing_context)
 {
-    VERIFY(&frame == m_frame);
+    VERIFY(&browsing_context == m_browsing_context);
     tear_down_layout_tree();
-    m_frame = nullptr;
+    m_browsing_context = nullptr;
 }
 
 void Document::tear_down_layout_tree()
@@ -399,7 +399,7 @@ void Document::force_layout()
 
 void Document::update_layout()
 {
-    if (!frame())
+    if (!browsing_context())
         return;
 
     if (!m_layout_root) {
@@ -412,7 +412,7 @@ void Document::update_layout()
 
     m_layout_root->set_needs_display();
 
-    if (frame()->is_main_frame()) {
+    if (browsing_context()->is_top_level()) {
         if (auto* page = this->page())
             page->client().page_did_layout();
     }
@@ -881,12 +881,12 @@ void Document::set_ready_state(const String& ready_state)
 
 Page* Document::page()
 {
-    return m_frame ? m_frame->page() : nullptr;
+    return m_browsing_context ? m_browsing_context->page() : nullptr;
 }
 
 const Page* Document::page() const
 {
-    return m_frame ? m_frame->page() : nullptr;
+    return m_browsing_context ? m_browsing_context->page() : nullptr;
 }
 
 EventTarget* Document::get_parent(const Event& event)
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index 98b73fe919..d9934f3421 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -115,11 +115,11 @@ public:
     String title() const;
     void set_title(const String&);
 
-    void attach_to_frame(Badge<Frame>, Frame&);
-    void detach_from_frame(Badge<Frame>, Frame&);
+    void attach_to_browsing_context(Badge<BrowsingContext>, BrowsingContext&);
+    void detach_from_browsing_context(Badge<BrowsingContext>, BrowsingContext&);
 
-    Frame* frame() { return m_frame.ptr(); }
-    const Frame* frame() const { return m_frame.ptr(); }
+    BrowsingContext* browsing_context() { return m_browsing_context.ptr(); }
+    const BrowsingContext* browsing_context() const { return m_browsing_context.ptr(); }
 
     Page* page();
     const Page* page() const;
@@ -297,7 +297,7 @@ private:
     RefPtr<CSS::StyleSheetList> m_style_sheets;
     RefPtr<Node> m_hovered_node;
     RefPtr<Node> m_inspected_node;
-    WeakPtr<Frame> m_frame;
+    WeakPtr<BrowsingContext> m_browsing_context;
     URL m_url;
 
     RefPtr<Window> m_window;
diff --git a/Userland/Libraries/LibWeb/DOM/Window.cpp b/Userland/Libraries/LibWeb/DOM/Window.cpp
index a5fc6fe89b..24ff88fc88 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Window.cpp
@@ -14,7 +14,7 @@
 #include <LibWeb/HighResolutionTime/Performance.h>
 #include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::DOM {
 
@@ -139,7 +139,7 @@ void Window::cancel_animation_frame(i32 id)
 
 void Window::did_set_location_href(Badge<Bindings::LocationObject>, const URL& new_href)
 {
-    auto* frame = document().frame();
+    auto* frame = document().browsing_context();
     if (!frame)
         return;
     frame->loader().load(new_href, FrameLoader::Type::Navigation);
@@ -147,7 +147,7 @@ void Window::did_set_location_href(Badge<Bindings::LocationObject>, const URL& n
 
 void Window::did_call_location_reload(Badge<Bindings::LocationObject>)
 {
-    auto* frame = document().frame();
+    auto* frame = document().browsing_context();
     if (!frame)
         return;
     frame->loader().load(document().url(), FrameLoader::Type::Reload);
diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 3098f02da7..186e0d2b17 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -179,7 +179,7 @@ class TextNode;
 namespace Web {
 class EventHandler;
 class EditEventHandler;
-class Frame;
+class BrowsingContext;
 class FrameLoader;
 class InProcessWebView;
 class LoadRequest;
diff --git a/Userland/Libraries/LibWeb/HTML/FrameHostElement.cpp b/Userland/Libraries/LibWeb/HTML/FrameHostElement.cpp
index 30b338a8d3..66a4467205 100644
--- a/Userland/Libraries/LibWeb/HTML/FrameHostElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/FrameHostElement.cpp
@@ -8,7 +8,7 @@
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/HTML/FrameHostElement.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 
@@ -26,18 +26,18 @@ void FrameHostElement::inserted()
     HTMLElement::inserted();
     if (!is_connected())
         return;
-    if (auto* frame = document().frame()) {
-        m_content_frame = Frame::create_subframe(*this, frame->main_frame());
-        m_content_frame->set_frame_nesting_levels(frame->frame_nesting_levels());
-        m_content_frame->register_frame_nesting(document().url());
+    if (auto* frame = document().browsing_context()) {
+        m_nested_browsing_context = BrowsingContext::create_nested(*this, frame->top_level_browsing_context());
+        m_nested_browsing_context->set_frame_nesting_levels(frame->frame_nesting_levels());
+        m_nested_browsing_context->register_frame_nesting(document().url());
     }
 }
 
 Origin FrameHostElement::content_origin() const
 {
-    if (!m_content_frame || !m_content_frame->document())
+    if (!m_nested_browsing_context || !m_nested_browsing_context->document())
         return {};
-    return m_content_frame->document()->origin();
+    return m_nested_browsing_context->document()->origin();
 }
 
 bool FrameHostElement::may_access_from_origin(const Origin& origin) const
@@ -47,10 +47,10 @@ bool FrameHostElement::may_access_from_origin(const Origin& origin) const
 
 const DOM::Document* FrameHostElement::content_document() const
 {
-    return m_content_frame ? m_content_frame->document() : nullptr;
+    return m_nested_browsing_context ? m_nested_browsing_context->document() : nullptr;
 }
 
-void FrameHostElement::content_frame_did_load(Badge<FrameLoader>)
+void FrameHostElement::nested_browsing_context_did_load(Badge<FrameLoader>)
 {
     dispatch_event(DOM::Event::create(EventNames::load));
 }
diff --git a/Userland/Libraries/LibWeb/HTML/FrameHostElement.h b/Userland/Libraries/LibWeb/HTML/FrameHostElement.h
index 54891becd4..6bb7afaefe 100644
--- a/Userland/Libraries/LibWeb/HTML/FrameHostElement.h
+++ b/Userland/Libraries/LibWeb/HTML/FrameHostElement.h
@@ -15,20 +15,20 @@ public:
     FrameHostElement(DOM::Document&, QualifiedName);
     virtual ~FrameHostElement() override;
 
-    Frame* content_frame() { return m_content_frame; }
-    const Frame* content_frame() const { return m_content_frame; }
+    BrowsingContext* nested_browsing_context() { return m_nested_browsing_context; }
+    const BrowsingContext* nested_browsing_context() const { return m_nested_browsing_context; }
 
     const DOM::Document* content_document() const;
 
     Origin content_origin() const;
     bool may_access_from_origin(const Origin&) const;
 
-    void content_frame_did_load(Badge<FrameLoader>);
+    void nested_browsing_context_did_load(Badge<FrameLoader>);
 
     virtual void inserted() override;
 
 protected:
-    RefPtr<Frame> m_content_frame;
+    RefPtr<BrowsingContext> m_nested_browsing_context;
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
index cfba5f8d4f..53c5c45137 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
@@ -10,7 +10,7 @@
 #include <LibWeb/HTML/HTMLInputElement.h>
 #include <LibWeb/HTML/SubmitEvent.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/URLEncoder.h>
 
 namespace Web::HTML {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
index 736a446457..ba01d28f43 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@@ -8,7 +8,7 @@
 #include <LibWeb/HTML/HTMLIFrameElement.h>
 #include <LibWeb/Layout/FrameBox.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 
@@ -43,7 +43,7 @@ void HTMLIFrameElement::inserted()
 
 void HTMLIFrameElement::load_src(const String& value)
 {
-    if (!m_content_frame)
+    if (!m_nested_browsing_context)
         return;
 
     if (value.is_null())
@@ -60,7 +60,7 @@ void HTMLIFrameElement::load_src(const String& value)
     }
 
     dbgln("Loading iframe document from {}", value);
-    m_content_frame->loader().load(url, FrameLoader::Type::IFrame);
+    m_nested_browsing_context->loader().load(url, FrameLoader::Type::IFrame);
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
index 27fcc3e7bd..480f90f3a0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
@@ -17,7 +17,7 @@
 #include <LibWeb/Layout/ButtonBox.h>
 #include <LibWeb/Layout/CheckBox.h>
 #include <LibWeb/Layout/RadioButton.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
index c2efc192db..b87e715b27 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
@@ -23,7 +23,7 @@ void HTMLTitleElement::children_changed()
 {
     HTMLElement::children_changed();
     if (auto* page = document().page()) {
-        if (document().frame() == &page->main_frame())
+        if (document().browsing_context() == &page->top_level_browsing_context())
             page->client().page_did_change_title(document().title());
     }
 }
diff --git a/Userland/Libraries/LibWeb/InProcessWebView.cpp b/Userland/Libraries/LibWeb/InProcessWebView.cpp
index 5417658e6c..f7447e483f 100644
--- a/Userland/Libraries/LibWeb/InProcessWebView.cpp
+++ b/Userland/Libraries/LibWeb/InProcessWebView.cpp
@@ -23,8 +23,8 @@
 #include <LibWeb/Layout/Node.h>
 #include <LibWeb/Layout/TextNode.h>
 #include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Page/EventHandler.h>
-#include <LibWeb/Page/Frame.h>
 #include <LibWeb/Painting/PaintContext.h>
 #include <LibWeb/UIEvents/MouseEvent.h>
 
@@ -89,7 +89,7 @@ void InProcessWebView::select_all()
 
 String InProcessWebView::selected_text() const
 {
-    return page().focused_frame().selected_text();
+    return page().focused_context().selected_text();
 }
 
 void InProcessWebView::page_did_layout()
@@ -104,7 +104,7 @@ void InProcessWebView::page_did_change_title(const String& title)
         on_title_change(title);
 }
 
-void InProcessWebView::page_did_set_document_in_main_frame(DOM::Document* document)
+void InProcessWebView::page_did_set_document_in_top_level_browsing_context(DOM::Document* document)
 {
     if (on_set_document)
         on_set_document(document);
@@ -210,17 +210,17 @@ void InProcessWebView::layout_and_sync_size()
     bool had_vertical_scrollbar = vertical_scrollbar().is_visible();
     bool had_horizontal_scrollbar = horizontal_scrollbar().is_visible();
 
-    page().main_frame().set_size(available_size());
+    page().top_level_browsing_context().set_size(available_size());
     set_content_size(layout_root()->size().to_type<int>());
 
     // NOTE: If layout caused us to gain or lose scrollbars, we have to lay out again
     //       since the scrollbars now take up some of the available space.
     if (had_vertical_scrollbar != vertical_scrollbar().is_visible() || had_horizontal_scrollbar != horizontal_scrollbar().is_visible()) {
-        page().main_frame().set_size(available_size());
+        page().top_level_browsing_context().set_size(available_size());
         set_content_size(layout_root()->size().to_type<int>());
     }
 
-    page().main_frame().set_viewport_scroll_offset({ horizontal_scrollbar().value(), vertical_scrollbar().value() });
+    page().top_level_browsing_context().set_viewport_scroll_offset({ horizontal_scrollbar().value(), vertical_scrollbar().value() });
 }
 
 void InProcessWebView::resize_event(GUI::ResizeEvent& event)
@@ -319,9 +319,9 @@ void InProcessWebView::keydown_event(GUI::KeyEvent& event)
 
 URL InProcessWebView::url() const
 {
-    if (!page().main_frame().document())
+    if (!page().top_level_browsing_context().document())
         return {};
-    return page().main_frame().document()->url();
+    return page().top_level_browsing_context().document()->url();
 }
 
 void InProcessWebView::reload()
@@ -331,13 +331,13 @@ void InProcessWebView::reload()
 
 void InProcessWebView::load_html(const StringView& html, const URL& url)
 {
-    page().main_frame().loader().load_html(html, url);
+    page().top_level_browsing_context().loader().load_html(html, url);
 }
 
 bool InProcessWebView::load(const URL& url)
 {
     set_override_cursor(Gfx::StandardCursor::None);
-    return page().main_frame().loader().load(url, FrameLoader::Type::Navigation);
+    return page().top_level_browsing_context().loader().load(url, FrameLoader::Type::Navigation);
 }
 
 const Layout::InitialContainingBlockBox* InProcessWebView::layout_root() const
@@ -360,27 +360,27 @@ void InProcessWebView::page_did_request_scroll_into_view(const Gfx::IntRect& rec
 
 void InProcessWebView::load_empty_document()
 {
-    page().main_frame().set_document(nullptr);
+    page().top_level_browsing_context().set_document(nullptr);
 }
 
 DOM::Document* InProcessWebView::document()
 {
-    return page().main_frame().document();
+    return page().top_level_browsing_context().document();
 }
 
 const DOM::Document* InProcessWebView::document() const
 {
-    return page().main_frame().document();
+    return page().top_level_browsing_context().document();
 }
 
 void InProcessWebView::set_document(DOM::Document* document)
 {
-    page().main_frame().set_document(document);
+    page().top_level_browsing_context().set_document(document);
 }
 
 void InProcessWebView::did_scroll()
 {
-    page().main_frame().set_viewport_scroll_offset({ horizontal_scrollbar().value(), vertical_scrollbar().value() });
+    page().top_level_browsing_context().set_viewport_scroll_offset({ horizontal_scrollbar().value(), vertical_scrollbar().value() });
 }
 
 void InProcessWebView::drop_event(GUI::DropEvent& event)
diff --git a/Userland/Libraries/LibWeb/InProcessWebView.h b/Userland/Libraries/LibWeb/InProcessWebView.h
index 12c5e58864..beb779c19a 100644
--- a/Userland/Libraries/LibWeb/InProcessWebView.h
+++ b/Userland/Libraries/LibWeb/InProcessWebView.h
@@ -70,7 +70,7 @@ private:
     virtual Gfx::Palette palette() const override { return GUI::AbstractScrollableWidget::palette(); }
     virtual Gfx::IntRect screen_rect() const override { return GUI::Desktop::the().rect(); }
     virtual void page_did_change_title(const String&) override;
-    virtual void page_did_set_document_in_main_frame(DOM::Document*) override;
+    virtual void page_did_set_document_in_top_level_browsing_context(DOM::Document*) override;
     virtual void page_did_start_loading(const URL&) override;
     virtual void page_did_finish_loading(const URL&) override;
     virtual void page_did_change_selection() override;
diff --git a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
index b0650284ef..f7a21b01b4 100644
--- a/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
@@ -13,7 +13,7 @@
 #include <LibWeb/Layout/InlineFormattingContext.h>
 #include <LibWeb/Layout/ListItemBox.h>
 #include <LibWeb/Layout/ReplacedBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -516,7 +516,7 @@ void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_fl
 
 void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_mode)
 {
-    auto viewport_rect = context_box().frame().viewport_rect();
+    auto viewport_rect = context_box().browsing_context().viewport_rect();
 
     auto& icb = downcast<Layout::InitialContainingBlockBox>(context_box());
     icb.build_stacking_context_tree();
diff --git a/Userland/Libraries/LibWeb/Layout/Box.cpp b/Userland/Libraries/LibWeb/Layout/Box.cpp
index de85dde8c5..398ffb4909 100644
--- a/Userland/Libraries/LibWeb/Layout/Box.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Box.cpp
@@ -10,7 +10,7 @@
 #include <LibWeb/HTML/HTMLHtmlElement.h>
 #include <LibWeb/Layout/BlockBox.h>
 #include <LibWeb/Layout/Box.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Painting/BorderPainting.h>
 
 namespace Web::Layout {
@@ -293,7 +293,7 @@ HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) con
 void Box::set_needs_display()
 {
     if (!is_inline()) {
-        frame().set_needs_display(enclosing_int_rect(absolute_rect()));
+        browsing_context().set_needs_display(enclosing_int_rect(absolute_rect()));
         return;
     }
 
diff --git a/Userland/Libraries/LibWeb/Layout/ButtonBox.cpp b/Userland/Libraries/LibWeb/Layout/ButtonBox.cpp
index 614f4bcada..0679257e55 100644
--- a/Userland/Libraries/LibWeb/Layout/ButtonBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/ButtonBox.cpp
@@ -11,7 +11,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Layout/ButtonBox.h>
 #include <LibWeb/Layout/Label.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -63,7 +63,7 @@ void ButtonBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsi
     set_needs_display();
 
     m_tracking_mouse = true;
-    frame().event_handler().set_mouse_event_tracking_layout_node(this);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
 void ButtonBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
@@ -73,7 +73,7 @@ void ButtonBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& positio
 
     // NOTE: Handling the click may run arbitrary JS, which could disappear this node.
     NonnullRefPtr protected_this = *this;
-    NonnullRefPtr protected_frame = frame();
+    NonnullRefPtr protected_frame = browsing_context();
 
     bool is_inside_node_or_label = enclosing_int_rect(absolute_rect()).contains(position);
     if (!is_inside_node_or_label)
@@ -114,7 +114,7 @@ void ButtonBox::handle_associated_label_mouseup(Badge<Label>)
 {
     // NOTE: Handling the click may run arbitrary JS, which could disappear this node.
     NonnullRefPtr protected_this = *this;
-    NonnullRefPtr protected_frame = frame();
+    NonnullRefPtr protected_frame = browsing_context();
 
     dom_node().did_click_button({});
     m_being_pressed = false;
diff --git a/Userland/Libraries/LibWeb/Layout/CheckBox.cpp b/Userland/Libraries/LibWeb/Layout/CheckBox.cpp
index a9f323b4b5..fc92179cdb 100644
--- a/Userland/Libraries/LibWeb/Layout/CheckBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/CheckBox.cpp
@@ -10,7 +10,7 @@
 #include <LibGfx/StylePainter.h>
 #include <LibWeb/Layout/CheckBox.h>
 #include <LibWeb/Layout/Label.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -48,7 +48,7 @@ void CheckBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsig
     set_needs_display();
 
     m_tracking_mouse = true;
-    frame().event_handler().set_mouse_event_tracking_layout_node(this);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
 void CheckBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
@@ -68,7 +68,7 @@ void CheckBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position
 
     m_being_pressed = false;
     m_tracking_mouse = false;
-    frame().event_handler().set_mouse_event_tracking_layout_node(nullptr);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(nullptr);
 }
 
 void CheckBox::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
diff --git a/Userland/Libraries/LibWeb/Layout/FrameBox.cpp b/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
index 092aa61d37..1ed914c87e 100644
--- a/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/FrameBox.cpp
@@ -10,7 +10,7 @@
 #include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Layout/FrameBox.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -25,7 +25,7 @@ FrameBox::~FrameBox()
 
 void FrameBox::prepare_for_replaced_layout()
 {
-    VERIFY(dom_node().content_frame());
+    VERIFY(dom_node().nested_browsing_context());
 
     set_has_intrinsic_width(true);
     set_has_intrinsic_height(true);
@@ -52,14 +52,14 @@ void FrameBox::paint(PaintContext& context, PaintPhase phase)
         context.painter().add_clip_rect(enclosing_int_rect(absolute_rect()));
         context.painter().translate(absolute_x(), absolute_y());
 
-        context.set_viewport_rect({ {}, dom_node().content_frame()->size() });
+        context.set_viewport_rect({ {}, dom_node().nested_browsing_context()->size() });
         const_cast<Layout::InitialContainingBlockBox*>(hosted_layout_tree)->paint_all_phases(context);
 
         context.set_viewport_rect(old_viewport_rect);
         context.painter().restore();
 
         if constexpr (HIGHLIGHT_FOCUSED_FRAME_DEBUG) {
-            if (dom_node().content_frame()->is_focused_frame()) {
+            if (dom_node().nested_browsing_context()->is_focused_context()) {
                 context.painter().draw_rect(absolute_rect().to_type<int>(), Color::Cyan);
             }
         }
@@ -70,8 +70,8 @@ void FrameBox::did_set_rect()
 {
     ReplacedBox::did_set_rect();
 
-    VERIFY(dom_node().content_frame());
-    dom_node().content_frame()->set_size(size().to_type<int>());
+    VERIFY(dom_node().nested_browsing_context());
+    dom_node().nested_browsing_context()->set_size(size().to_type<int>());
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/Layout/ImageBox.cpp b/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
index c358c08d66..c1b0065002 100644
--- a/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/ImageBox.cpp
@@ -8,7 +8,7 @@
 #include <LibGfx/Painter.h>
 #include <LibGfx/StylePainter.h>
 #include <LibWeb/Layout/ImageBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -16,12 +16,12 @@ ImageBox::ImageBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr
     : ReplacedBox(document, element, move(style))
     , m_image_loader(image_loader)
 {
-    frame().register_viewport_client(*this);
+    browsing_context().register_viewport_client(*this);
 }
 
 ImageBox::~ImageBox()
 {
-    frame().unregister_viewport_client(*this);
+    browsing_context().unregister_viewport_client(*this);
 }
 
 int ImageBox::preferred_width() const
diff --git a/Userland/Libraries/LibWeb/Layout/ImageBox.h b/Userland/Libraries/LibWeb/Layout/ImageBox.h
index de4527c814..c58853d373 100644
--- a/Userland/Libraries/LibWeb/Layout/ImageBox.h
+++ b/Userland/Libraries/LibWeb/Layout/ImageBox.h
@@ -8,13 +8,13 @@
 
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/Layout/ReplacedBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
 class ImageBox
     : public ReplacedBox
-    , public Frame::ViewportClient {
+    , public BrowsingContext::ViewportClient {
 public:
     ImageBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>, const ImageLoader&);
     virtual ~ImageBox() override;
diff --git a/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp b/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
index 3cd7f29a33..3863546763 100644
--- a/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
+++ b/Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
@@ -7,7 +7,7 @@
 #include <LibGfx/Painter.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Painting/StackingContext.h>
 
 namespace Web::Layout {
diff --git a/Userland/Libraries/LibWeb/Layout/Label.cpp b/Userland/Libraries/LibWeb/Layout/Label.cpp
index 053ff54fd4..0edff98432 100644
--- a/Userland/Libraries/LibWeb/Layout/Label.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Label.cpp
@@ -13,7 +13,7 @@
 #include <LibWeb/Layout/Label.h>
 #include <LibWeb/Layout/LabelableNode.h>
 #include <LibWeb/Layout/TextNode.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
diff --git a/Userland/Libraries/LibWeb/Layout/Node.cpp b/Userland/Libraries/LibWeb/Layout/Node.cpp
index 533c747ffd..81be66ef25 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.cpp
+++ b/Userland/Libraries/LibWeb/Layout/Node.cpp
@@ -15,7 +15,7 @@
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/Node.h>
 #include <LibWeb/Layout/TextNode.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -104,16 +104,16 @@ HitTestResult Node::hit_test(const Gfx::IntPoint& position, HitTestType type) co
     return result;
 }
 
-const Frame& Node::frame() const
+const BrowsingContext& Node::browsing_context() const
 {
-    VERIFY(document().frame());
-    return *document().frame();
+    VERIFY(document().browsing_context());
+    return *document().browsing_context();
 }
 
-Frame& Node::frame()
+BrowsingContext& Node::browsing_context()
 {
-    VERIFY(document().frame());
-    return *document().frame();
+    VERIFY(document().browsing_context());
+    return *document().browsing_context();
 }
 
 const InitialContainingBlockBox& Node::root() const
@@ -140,7 +140,7 @@ void Node::set_needs_display()
     if (auto* block = containing_block()) {
         block->for_each_fragment([&](auto& fragment) {
             if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
-                frame().set_needs_display(enclosing_int_rect(fragment.absolute_rect()));
+                browsing_context().set_needs_display(enclosing_int_rect(fragment.absolute_rect()));
             }
             return IterationDecision::Continue;
         });
diff --git a/Userland/Libraries/LibWeb/Layout/Node.h b/Userland/Libraries/LibWeb/Layout/Node.h
index 770339732c..837ea203db 100644
--- a/Userland/Libraries/LibWeb/Layout/Node.h
+++ b/Userland/Libraries/LibWeb/Layout/Node.h
@@ -65,8 +65,8 @@ public:
     DOM::Document& document() { return m_document; }
     const DOM::Document& document() const { return m_document; }
 
-    const Frame& frame() const;
-    Frame& frame();
+    const BrowsingContext& browsing_context() const;
+    BrowsingContext& browsing_context();
 
     const InitialContainingBlockBox& root() const;
     InitialContainingBlockBox& root();
diff --git a/Userland/Libraries/LibWeb/Layout/RadioButton.cpp b/Userland/Libraries/LibWeb/Layout/RadioButton.cpp
index 02399b7a7b..8712c2f9b0 100644
--- a/Userland/Libraries/LibWeb/Layout/RadioButton.cpp
+++ b/Userland/Libraries/LibWeb/Layout/RadioButton.cpp
@@ -10,7 +10,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/Layout/Label.h>
 #include <LibWeb/Layout/RadioButton.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
@@ -48,7 +48,7 @@ void RadioButton::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, un
     set_needs_display();
 
     m_tracking_mouse = true;
-    frame().event_handler().set_mouse_event_tracking_layout_node(this);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
 void RadioButton::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
@@ -68,7 +68,7 @@ void RadioButton::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& posit
 
     m_being_pressed = false;
     m_tracking_mouse = false;
-    frame().event_handler().set_mouse_event_tracking_layout_node(nullptr);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(nullptr);
 }
 
 void RadioButton::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
diff --git a/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp b/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
index 24bcf24326..677a24f1b7 100644
--- a/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
+++ b/Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
@@ -12,7 +12,7 @@
 #include <LibWeb/Layout/TableFormattingContext.h>
 #include <LibWeb/Layout/TableRowBox.h>
 #include <LibWeb/Layout/TableRowGroupBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::Layout {
 
diff --git a/Userland/Libraries/LibWeb/Layout/TextNode.cpp b/Userland/Libraries/LibWeb/Layout/TextNode.cpp
index e2f6783e31..c5aaeb47d8 100644
--- a/Userland/Libraries/LibWeb/Layout/TextNode.cpp
+++ b/Userland/Libraries/LibWeb/Layout/TextNode.cpp
@@ -12,7 +12,7 @@
 #include <LibWeb/Layout/InlineFormattingContext.h>
 #include <LibWeb/Layout/Label.h>
 #include <LibWeb/Layout/TextNode.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <ctype.h>
 
 namespace Web::Layout {
@@ -77,17 +77,17 @@ void TextNode::paint_fragment(PaintContext& context, const LineBoxFragment& frag
 
 void TextNode::paint_cursor_if_needed(PaintContext& context, const LineBoxFragment& fragment) const
 {
-    if (!frame().is_focused_frame())
+    if (!browsing_context().is_focused_context())
         return;
 
-    if (!frame().cursor_blink_state())
+    if (!browsing_context().cursor_blink_state())
         return;
 
-    if (frame().cursor_position().node() != &dom_node())
+    if (browsing_context().cursor_position().node() != &dom_node())
         return;
 
     // NOTE: This checks if the cursor is before the start or after the end of the fragment. If it is at the end, after all text, it should still be painted.
-    if (frame().cursor_position().offset() < (unsigned)fragment.start() || frame().cursor_position().offset() > (unsigned)(fragment.start() + fragment.length()))
+    if (browsing_context().cursor_position().offset() < (unsigned)fragment.start() || browsing_context().cursor_position().offset() > (unsigned)(fragment.start() + fragment.length()))
         return;
 
     if (!fragment.layout_node().dom_node() || !fragment.layout_node().dom_node()->is_editable())
@@ -95,7 +95,7 @@ void TextNode::paint_cursor_if_needed(PaintContext& context, const LineBoxFragme
 
     auto fragment_rect = fragment.absolute_rect();
 
-    float cursor_x = fragment_rect.x() + font().width(fragment.text().substring_view(0, frame().cursor_position().offset() - fragment.start()));
+    float cursor_x = fragment_rect.x() + font().width(fragment.text().substring_view(0, browsing_context().cursor_position().offset() - fragment.start()));
     float cursor_top = fragment_rect.top();
     float cursor_height = fragment_rect.height();
     Gfx::IntRect cursor_rect(cursor_x, cursor_top, 1, cursor_height);
@@ -234,7 +234,7 @@ void TextNode::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint& positi
     if (!parent() || !is<Label>(*parent()))
         return;
     downcast<Label>(*parent()).handle_mousedown_on_label({}, position, button);
-    frame().event_handler().set_mouse_event_tracking_layout_node(this);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
 void TextNode::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
@@ -246,7 +246,7 @@ void TextNode::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position
     NonnullRefPtr protect = *this;
 
     downcast<Label>(*parent()).handle_mouseup_on_label({}, position, button);
-    frame().event_handler().set_mouse_event_tracking_layout_node(nullptr);
+    browsing_context().event_handler().set_mouse_event_tracking_layout_node(nullptr);
 }
 
 void TextNode::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
diff --git a/Userland/Libraries/LibWeb/Loader/FrameLoader.cpp b/Userland/Libraries/LibWeb/Loader/FrameLoader.cpp
index f1ff25c13e..df5b565da1 100644
--- a/Userland/Libraries/LibWeb/Loader/FrameLoader.cpp
+++ b/Userland/Libraries/LibWeb/Loader/FrameLoader.cpp
@@ -18,13 +18,13 @@
 #include <LibWeb/Loader/FrameLoader.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/Namespace.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Page/Page.h>
 
 namespace Web {
 
-FrameLoader::FrameLoader(Frame& frame)
-    : m_frame(frame)
+FrameLoader::FrameLoader(BrowsingContext& browsing_context)
+    : m_browsing_context(browsing_context)
 {
 }
 
@@ -136,7 +136,7 @@ bool FrameLoader::load(const LoadRequest& request, Type type)
         return false;
     }
 
-    if (!m_frame.is_frame_nesting_allowed(request.url())) {
+    if (!m_browsing_context.is_frame_nesting_allowed(request.url())) {
         dbgln("No further recursion is allowed for the frame, abort load!");
         return false;
     }
@@ -144,7 +144,7 @@ bool FrameLoader::load(const LoadRequest& request, Type type)
     auto& url = request.url();
 
     if (type == Type::Navigation || type == Type::Reload) {
-        if (auto* page = frame().page())
+        if (auto* page = browsing_context().page())
             page->client().page_did_start_loading(url);
     }
 
@@ -171,7 +171,7 @@ bool FrameLoader::load(const LoadRequest& request, Type type)
                     return;
                 }
                 dbgln("Decoded favicon, {}", bitmap->size());
-                if (auto* page = frame().page())
+                if (auto* page = browsing_context().page())
                     page->client().page_did_change_favicon(*bitmap);
             });
     }
@@ -188,7 +188,7 @@ bool FrameLoader::load(const URL& url, Type type)
         return false;
     }
 
-    auto request = LoadRequest::create_for_url_on_page(url, frame().page());
+    auto request = LoadRequest::create_for_url_on_page(url, browsing_context().page());
     return load(request, type);
 }
 
@@ -197,7 +197,7 @@ void FrameLoader::load_html(const StringView& html, const URL& url)
     auto document = DOM::Document::create(url);
     HTML::HTMLDocumentParser parser(document, html, "utf-8");
     parser.run(url);
-    frame().set_document(&parser.document());
+    browsing_context().set_document(&parser.document());
 }
 
 // FIXME: Use an actual templating engine (our own one when it's built, preferably
@@ -217,7 +217,7 @@ void FrameLoader::load_error_page(const URL& failed_url, const String& error)
             generator.append(data);
             auto document = HTML::parse_html_document(generator.as_string_view(), failed_url, "utf-8");
             VERIFY(document);
-            frame().set_document(document);
+            browsing_context().set_document(document);
         },
         [](auto& error, auto) {
             dbgln("Failed to load error page: {}", error);
@@ -259,7 +259,7 @@ void FrameLoader::resource_did_load()
     document->set_encoding(resource()->encoding());
     document->set_content_type(resource()->mime_type());
 
-    frame().set_document(document);
+    browsing_context().set_document(document);
 
     if (!parse_document(*document, resource()->encoded_data())) {
         load_error_page(url, "Failed to parse content.");
@@ -272,15 +272,15 @@ void FrameLoader::resource_did_load()
         document->set_cookie(set_cookie.value(), Cookie::Source::Http);
 
     if (!url.fragment().is_empty())
-        frame().scroll_to_anchor(url.fragment());
+        browsing_context().scroll_to_anchor(url.fragment());
 
-    if (auto* host_element = frame().host_element()) {
+    if (auto* host_element = browsing_context().host_element()) {
         // FIXME: Perhaps in the future we'll have a better common base class for <frame> and <iframe>
         VERIFY(is<HTML::HTMLIFrameElement>(*host_element));
-        downcast<HTML::HTMLIFrameElement>(*host_element).content_frame_did_load({});
+        downcast<HTML::HTMLIFrameElement>(*host_element).nested_browsing_context_did_load({});
     }
 
-    if (auto* page = frame().page())
+    if (auto* page = browsing_context().page())
         page->client().page_did_finish_loading(url);
 }
 
diff --git a/Userland/Libraries/LibWeb/Loader/FrameLoader.h b/Userland/Libraries/LibWeb/Loader/FrameLoader.h
index d3b1536470..2cd98a94a7 100644
--- a/Userland/Libraries/LibWeb/Loader/FrameLoader.h
+++ b/Userland/Libraries/LibWeb/Loader/FrameLoader.h
@@ -23,7 +23,7 @@ public:
         IFrame,
     };
 
-    explicit FrameLoader(Frame&);
+    explicit FrameLoader(BrowsingContext&);
     ~FrameLoader();
 
     bool load(const URL&, Type);
@@ -31,8 +31,8 @@ public:
 
     void load_html(const StringView&, const URL&);
 
-    Frame& frame() { return m_frame; }
-    const Frame& frame() const { return m_frame; }
+    BrowsingContext& browsing_context() { return m_browsing_context; }
+    const BrowsingContext& browsing_context() const { return m_browsing_context; }
 
 private:
     // ^ResourceClient
@@ -42,7 +42,7 @@ private:
     void load_error_page(const URL& failed_url, const String& error_message);
     bool parse_document(DOM::Document&, const ByteBuffer& data);
 
-    Frame& m_frame;
+    BrowsingContext& m_browsing_context;
     size_t m_redirects_count { 0 };
 };
 
diff --git a/Userland/Libraries/LibWeb/Page/Frame.cpp b/Userland/Libraries/LibWeb/Page/BrowsingContext.cpp
similarity index 77%
rename from Userland/Libraries/LibWeb/Page/Frame.cpp
rename to Userland/Libraries/LibWeb/Page/BrowsingContext.cpp
index 0d130f2fa8..da594353f2 100644
--- a/Userland/Libraries/LibWeb/Page/Frame.cpp
+++ b/Userland/Libraries/LibWeb/Page/BrowsingContext.cpp
@@ -13,14 +13,14 @@
 #include <LibWeb/Layout/BreakNode.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/TextNode.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/UIEvents/EventNames.h>
 
 namespace Web {
 
-Frame::Frame(DOM::Element& host_element, Frame& main_frame)
-    : m_page(*main_frame.page())
-    , m_main_frame(main_frame)
+BrowsingContext::BrowsingContext(DOM::Element& host_element, BrowsingContext& top_level_browsing_context)
+    : m_page(*top_level_browsing_context.page())
+    , m_top_level_browsing_context(top_level_browsing_context)
     , m_loader(*this)
     , m_event_handler({}, *this)
     , m_host_element(host_element)
@@ -28,23 +28,23 @@ Frame::Frame(DOM::Element& host_element, Frame& main_frame)
     setup();
 }
 
-Frame::Frame(Page& page)
+BrowsingContext::BrowsingContext(Page& page)
     : m_page(page)
-    , m_main_frame(*this)
+    , m_top_level_browsing_context(*this)
     , m_loader(*this)
     , m_event_handler({}, *this)
 {
     setup();
 }
 
-Frame::~Frame()
+BrowsingContext::~BrowsingContext()
 {
 }
 
-void Frame::setup()
+void BrowsingContext::setup()
 {
     m_cursor_blink_timer = Core::Timer::construct(500, [this] {
-        if (!is_focused_frame())
+        if (!is_focused_context())
             return;
         if (m_cursor_position.node() && m_cursor_position.node()->layout_node()) {
             m_cursor_blink_state = !m_cursor_blink_state;
@@ -53,24 +53,24 @@ void Frame::setup()
     });
 }
 
-void Frame::did_edit(Badge<EditEventHandler>)
+void BrowsingContext::did_edit(Badge<EditEventHandler>)
 {
     reset_cursor_blink_cycle();
 }
 
-void Frame::reset_cursor_blink_cycle()
+void BrowsingContext::reset_cursor_blink_cycle()
 {
     m_cursor_blink_state = true;
     m_cursor_blink_timer->restart();
     m_cursor_position.node()->layout_node()->set_needs_display();
 }
 
-bool Frame::is_focused_frame() const
+bool BrowsingContext::is_focused_context() const
 {
-    return m_page && &m_page->focused_frame() == this;
+    return m_page && &m_page->focused_context() == this;
 }
 
-void Frame::set_document(DOM::Document* document)
+void BrowsingContext::set_document(DOM::Document* document)
 {
     if (m_document == document)
         return;
@@ -78,21 +78,21 @@ void Frame::set_document(DOM::Document* document)
     m_cursor_position = {};
 
     if (m_document)
-        m_document->detach_from_frame({}, *this);
+        m_document->detach_from_browsing_context({}, *this);
 
     m_document = document;
 
     if (m_document) {
-        m_document->attach_to_frame({}, *this);
-        if (m_page && is_main_frame())
+        m_document->attach_to_browsing_context({}, *this);
+        if (m_page && is_top_level())
             m_page->client().page_did_change_title(m_document->title());
     }
 
     if (m_page)
-        m_page->client().page_did_set_document_in_main_frame(m_document);
+        m_page->client().page_did_set_document_in_top_level_browsing_context(m_document);
 }
 
-void Frame::set_viewport_rect(const Gfx::IntRect& rect)
+void BrowsingContext::set_viewport_rect(const Gfx::IntRect& rect)
 {
     bool did_change = false;
 
@@ -116,7 +116,7 @@ void Frame::set_viewport_rect(const Gfx::IntRect& rect)
     }
 }
 
-void Frame::set_size(const Gfx::IntSize& size)
+void BrowsingContext::set_size(const Gfx::IntSize& size)
 {
     if (m_size == size)
         return;
@@ -130,7 +130,7 @@ void Frame::set_size(const Gfx::IntSize& size)
         client->frame_did_set_viewport_rect(viewport_rect());
 }
 
-void Frame::set_viewport_scroll_offset(const Gfx::IntPoint& offset)
+void BrowsingContext::set_viewport_scroll_offset(const Gfx::IntPoint& offset)
 {
     if (m_viewport_scroll_offset == offset)
         return;
@@ -140,14 +140,14 @@ void Frame::set_viewport_scroll_offset(const Gfx::IntPoint& offset)
         client->frame_did_set_viewport_rect(viewport_rect());
 }
 
-void Frame::set_needs_display(const Gfx::IntRect& rect)
+void BrowsingContext::set_needs_display(const Gfx::IntRect& rect)
 {
     if (!viewport_rect().intersects(rect))
         return;
 
-    if (is_main_frame()) {
+    if (is_top_level()) {
         if (m_page)
-            m_page->client().page_did_invalidate(to_main_frame_rect(rect));
+            m_page->client().page_did_invalidate(to_top_level_rect(rect));
         return;
     }
 
@@ -155,7 +155,7 @@ void Frame::set_needs_display(const Gfx::IntRect& rect)
         host_element()->layout_node()->set_needs_display();
 }
 
-void Frame::scroll_to_anchor(const String& fragment)
+void BrowsingContext::scroll_to_anchor(const String& fragment)
 {
     if (!document())
         return;
@@ -190,18 +190,18 @@ void Frame::scroll_to_anchor(const String& fragment)
         m_page->client().page_did_request_scroll_into_view(enclosing_int_rect(float_rect));
 }
 
-Gfx::IntRect Frame::to_main_frame_rect(const Gfx::IntRect& a_rect)
+Gfx::IntRect BrowsingContext::to_top_level_rect(const Gfx::IntRect& a_rect)
 {
     auto rect = a_rect;
-    rect.set_location(to_main_frame_position(a_rect.location()));
+    rect.set_location(to_top_level_position(a_rect.location()));
     return rect;
 }
 
-Gfx::IntPoint Frame::to_main_frame_position(const Gfx::IntPoint& a_position)
+Gfx::IntPoint BrowsingContext::to_top_level_position(const Gfx::IntPoint& a_position)
 {
     auto position = a_position;
     for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
-        if (ancestor->is_main_frame())
+        if (ancestor->is_top_level())
             break;
         if (!ancestor->host_element())
             return {};
@@ -212,7 +212,7 @@ Gfx::IntPoint Frame::to_main_frame_position(const Gfx::IntPoint& a_position)
     return position;
 }
 
-void Frame::set_cursor_position(DOM::Position position)
+void BrowsingContext::set_cursor_position(DOM::Position position)
 {
     if (m_cursor_position == position)
         return;
@@ -228,7 +228,7 @@ void Frame::set_cursor_position(DOM::Position position)
     reset_cursor_blink_cycle();
 }
 
-String Frame::selected_text() const
+String BrowsingContext::selected_text() const
 {
     StringBuilder builder;
     if (!m_document)
@@ -275,29 +275,29 @@ String Frame::selected_text() const
     return builder.to_string();
 }
 
-void Frame::register_viewport_client(ViewportClient& client)
+void BrowsingContext::register_viewport_client(ViewportClient& client)
 {
     auto result = m_viewport_clients.set(&client);
     VERIFY(result == AK::HashSetResult::InsertedNewEntry);
 }
 
-void Frame::unregister_viewport_client(ViewportClient& client)
+void BrowsingContext::unregister_viewport_client(ViewportClient& client)
 {
     bool was_removed = m_viewport_clients.remove(&client);
     VERIFY(was_removed);
 }
 
-void Frame::register_frame_nesting(URL const& url)
+void BrowsingContext::register_frame_nesting(URL const& url)
 {
     m_frame_nesting_levels.ensure(url)++;
 }
 
-bool Frame::is_frame_nesting_allowed(URL const& url) const
+bool BrowsingContext::is_frame_nesting_allowed(URL const& url) const
 {
     return m_frame_nesting_levels.get(url).value_or(0) < 3;
 }
 
-bool Frame::increment_cursor_position_offset()
+bool BrowsingContext::increment_cursor_position_offset()
 {
     if (!m_cursor_position.increment_offset())
         return false;
@@ -305,7 +305,7 @@ bool Frame::increment_cursor_position_offset()
     return true;
 }
 
-bool Frame::decrement_cursor_position_offset()
+bool BrowsingContext::decrement_cursor_position_offset()
 {
     if (!m_cursor_position.decrement_offset())
         return false;
diff --git a/Userland/Libraries/LibWeb/Page/Frame.h b/Userland/Libraries/LibWeb/Page/BrowsingContext.h
similarity index 74%
rename from Userland/Libraries/LibWeb/Page/Frame.h
rename to Userland/Libraries/LibWeb/Page/BrowsingContext.h
index 8a0346d0b7..fc8c1f72ed 100644
--- a/Userland/Libraries/LibWeb/Page/Frame.h
+++ b/Userland/Libraries/LibWeb/Page/BrowsingContext.h
@@ -21,11 +21,11 @@
 
 namespace Web {
 
-class Frame : public TreeNode<Frame> {
+class BrowsingContext : public TreeNode<BrowsingContext> {
 public:
-    static NonnullRefPtr<Frame> create_subframe(DOM::Element& host_element, Frame& main_frame) { return adopt_ref(*new Frame(host_element, main_frame)); }
-    static NonnullRefPtr<Frame> create(Page& page) { return adopt_ref(*new Frame(page)); }
-    ~Frame();
+    static NonnullRefPtr<BrowsingContext> create_nested(DOM::Element& host_element, BrowsingContext& top_level_browsing_context) { return adopt_ref(*new BrowsingContext(host_element, top_level_browsing_context)); }
+    static NonnullRefPtr<BrowsingContext> create(Page& page) { return adopt_ref(*new BrowsingContext(page)); }
+    ~BrowsingContext();
 
     class ViewportClient {
     public:
@@ -35,8 +35,8 @@ public:
     void register_viewport_client(ViewportClient&);
     void unregister_viewport_client(ViewportClient&);
 
-    bool is_main_frame() const { return this == &m_main_frame; }
-    bool is_focused_frame() const;
+    bool is_top_level() const { return this == &m_top_level_browsing_context; }
+    bool is_focused_context() const;
 
     const DOM::Document* document() const { return m_document; }
     DOM::Document* document() { return m_document; }
@@ -63,14 +63,14 @@ public:
 
     void scroll_to_anchor(const String&);
 
-    Frame& main_frame() { return m_main_frame; }
-    const Frame& main_frame() const { return m_main_frame; }
+    BrowsingContext& top_level_browsing_context() { return m_top_level_browsing_context; }
+    BrowsingContext const& top_level_browsing_context() const { return m_top_level_browsing_context; }
 
     DOM::Element* host_element() { return m_host_element; }
     const DOM::Element* host_element() const { return m_host_element; }
 
-    Gfx::IntPoint to_main_frame_position(const Gfx::IntPoint&);
-    Gfx::IntRect to_main_frame_rect(const Gfx::IntRect&);
+    Gfx::IntPoint to_top_level_position(const Gfx::IntPoint&);
+    Gfx::IntRect to_top_level_rect(const Gfx::IntRect&);
 
     const DOM::Position& cursor_position() const { return m_cursor_position; }
     void set_cursor_position(DOM::Position);
@@ -90,15 +90,15 @@ public:
     HashMap<URL, size_t> const& frame_nesting_levels() const { return m_frame_nesting_levels; }
 
 private:
-    explicit Frame(DOM::Element& host_element, Frame& main_frame);
-    explicit Frame(Page&);
+    explicit BrowsingContext(DOM::Element& host_element, BrowsingContext& top_level_browsing_context);
+    explicit BrowsingContext(Page&);
 
     void reset_cursor_blink_cycle();
 
     void setup();
 
     WeakPtr<Page> m_page;
-    Frame& m_main_frame;
+    BrowsingContext& m_top_level_browsing_context;
 
     FrameLoader m_loader;
     EventHandler m_event_handler;
diff --git a/Userland/Libraries/LibWeb/Page/EditEventHandler.cpp b/Userland/Libraries/LibWeb/Page/EditEventHandler.cpp
index e3d6691cda..a9246df1e6 100644
--- a/Userland/Libraries/LibWeb/Page/EditEventHandler.cpp
+++ b/Userland/Libraries/LibWeb/Page/EditEventHandler.cpp
@@ -12,8 +12,8 @@
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/LayoutPosition.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Page/EditEventHandler.h>
-#include <LibWeb/Page/Frame.h>
 
 namespace Web {
 
diff --git a/Userland/Libraries/LibWeb/Page/EditEventHandler.h b/Userland/Libraries/LibWeb/Page/EditEventHandler.h
index 30fe21f30a..0ac8827ebf 100644
--- a/Userland/Libraries/LibWeb/Page/EditEventHandler.h
+++ b/Userland/Libraries/LibWeb/Page/EditEventHandler.h
@@ -13,7 +13,7 @@ namespace Web {
 
 class EditEventHandler {
 public:
-    explicit EditEventHandler(Frame& frame)
+    explicit EditEventHandler(BrowsingContext& frame)
         : m_frame(frame)
     {
     }
@@ -25,7 +25,7 @@ public:
     virtual void handle_insert(DOM::Position, u32 code_point);
 
 private:
-    Frame& m_frame;
+    BrowsingContext& m_frame;
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/Page/EventHandler.cpp b/Userland/Libraries/LibWeb/Page/EventHandler.cpp
index c5c491dc43..31fd4c9cc4 100644
--- a/Userland/Libraries/LibWeb/Page/EventHandler.cpp
+++ b/Userland/Libraries/LibWeb/Page/EventHandler.cpp
@@ -14,8 +14,8 @@
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Page/EventHandler.h>
-#include <LibWeb/Page/Frame.h>
 #include <LibWeb/UIEvents/EventNames.h>
 #include <LibWeb/UIEvents/MouseEvent.h>
 
@@ -87,7 +87,7 @@ static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, c
     };
 }
 
-EventHandler::EventHandler(Badge<Frame>, Frame& frame)
+EventHandler::EventHandler(Badge<BrowsingContext>, BrowsingContext& frame)
     : m_frame(frame)
     , m_edit_event_handler(make<EditEventHandler>(frame))
 {
@@ -158,7 +158,7 @@ bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button
     if (result.layout_node && result.layout_node->dom_node()) {
         RefPtr<DOM::Node> node = result.layout_node->dom_node();
         if (is<HTML::HTMLIFrameElement>(*node)) {
-            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_frame())
+            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
                 return subframe->event_handler().handle_mouseup(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
             return false;
         }
@@ -202,13 +202,13 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
             return false;
 
         if (is<HTML::HTMLIFrameElement>(*node)) {
-            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_frame())
+            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
                 return subframe->event_handler().handle_mousedown(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
             return false;
         }
 
         if (auto* page = m_frame.page())
-            page->set_focused_frame({}, m_frame);
+            page->set_focused_browsing_context({}, m_frame);
 
         auto offset = compute_mouse_event_offset(position, *result.layout_node);
         node->dispatch_event(UIEvents::MouseEvent::create(UIEvents::EventNames::mousedown, offset.x(), offset.y(), position.x(), position.y()));
@@ -222,7 +222,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
         auto& image_element = downcast<HTML::HTMLImageElement>(*node);
         auto image_url = image_element.document().complete_url(image_element.src());
         if (auto* page = m_frame.page())
-            page->client().page_did_request_image_context_menu(m_frame.to_main_frame_position(position), image_url, "", modifiers, image_element.bitmap());
+            page->client().page_did_request_image_context_menu(m_frame.to_top_level_position(position), image_url, "", modifiers, image_element.bitmap());
         return true;
     }
 
@@ -237,7 +237,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
                 auto anchor = href.substring_view(1, href.length() - 1);
                 m_frame.scroll_to_anchor(anchor);
             } else {
-                if (m_frame.is_main_frame()) {
+                if (m_frame.is_top_level()) {
                     if (auto* page = m_frame.page())
                         page->client().page_did_click_link(url, link->target(), modifiers);
                 } else {
@@ -247,7 +247,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
             }
         } else if (button == GUI::MouseButton::Right) {
             if (auto* page = m_frame.page())
-                page->client().page_did_request_link_context_menu(m_frame.to_main_frame_position(position), url, link->target(), modifiers);
+                page->client().page_did_request_link_context_menu(m_frame.to_top_level_position(position), url, link->target(), modifiers);
         } else if (button == GUI::MouseButton::Middle) {
             if (auto* page = m_frame.page())
                 page->client().page_did_middle_click_link(url, link->target(), modifiers);
@@ -262,7 +262,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
             }
         } else if (button == GUI::MouseButton::Right) {
             if (auto* page = m_frame.page())
-                page->client().page_did_request_context_menu(m_frame.to_main_frame_position(position));
+                page->client().page_did_request_context_menu(m_frame.to_top_level_position(position));
         }
     }
     return true;
@@ -299,7 +299,7 @@ bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned butt
         RefPtr<DOM::Node> node = result.layout_node->dom_node();
 
         if (node && is<HTML::HTMLIFrameElement>(*node)) {
-            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).content_frame())
+            if (auto* subframe = downcast<HTML::HTMLIFrameElement>(*node).nested_browsing_context())
                 return subframe->event_handler().handle_mousemove(position.translated(compute_mouse_event_offset({}, *result.layout_node)), buttons, modifiers);
             return false;
         }
@@ -340,7 +340,7 @@ bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned butt
         if (hovered_node_changed) {
             RefPtr<HTML::HTMLElement> hovered_html_element = document.hovered_node() ? document.hovered_node()->enclosing_html_element_with_attribute(HTML::AttributeNames::title) : nullptr;
             if (hovered_html_element && !hovered_html_element->title().is_null()) {
-                page->client().page_did_enter_tooltip_area(m_frame.to_main_frame_position(position), hovered_html_element->title());
+                page->client().page_did_enter_tooltip_area(m_frame.to_top_level_position(position), hovered_html_element->title());
             } else {
                 page->client().page_did_leave_tooltip_area();
             }
diff --git a/Userland/Libraries/LibWeb/Page/EventHandler.h b/Userland/Libraries/LibWeb/Page/EventHandler.h
index 9232a54942..796bac09cb 100644
--- a/Userland/Libraries/LibWeb/Page/EventHandler.h
+++ b/Userland/Libraries/LibWeb/Page/EventHandler.h
@@ -17,11 +17,11 @@
 
 namespace Web {
 
-class Frame;
+class BrowsingContext;
 
 class EventHandler {
 public:
-    explicit EventHandler(Badge<Frame>, Frame&);
+    explicit EventHandler(Badge<BrowsingContext>, BrowsingContext&);
     ~EventHandler();
 
     bool handle_mouseup(const Gfx::IntPoint&, unsigned button, unsigned modifiers);
@@ -42,7 +42,7 @@ private:
     Layout::InitialContainingBlockBox* layout_root();
     const Layout::InitialContainingBlockBox* layout_root() const;
 
-    Frame& m_frame;
+    BrowsingContext& m_frame;
 
     bool m_in_mouse_selection { false };
 
diff --git a/Userland/Libraries/LibWeb/Page/Page.cpp b/Userland/Libraries/LibWeb/Page/Page.cpp
index 5b8e583980..f44117d373 100644
--- a/Userland/Libraries/LibWeb/Page/Page.cpp
+++ b/Userland/Libraries/LibWeb/Page/Page.cpp
@@ -5,7 +5,7 @@
  */
 
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/Page/Page.h>
 
 namespace Web {
@@ -13,38 +13,38 @@ namespace Web {
 Page::Page(PageClient& client)
     : m_client(client)
 {
-    m_main_frame = Frame::create(*this);
+    m_top_level_browsing_context = BrowsingContext::create(*this);
 }
 
 Page::~Page()
 {
 }
 
-Frame& Page::focused_frame()
+BrowsingContext& Page::focused_context()
 {
-    if (m_focused_frame)
-        return *m_focused_frame;
-    return main_frame();
+    if (m_focused_context)
+        return *m_focused_context;
+    return top_level_browsing_context();
 }
 
-void Page::set_focused_frame(Badge<EventHandler>, Frame& frame)
+void Page::set_focused_browsing_context(Badge<EventHandler>, BrowsingContext& browsing_context)
 {
-    m_focused_frame = frame.make_weak_ptr();
+    m_focused_context = browsing_context.make_weak_ptr();
 }
 
 void Page::load(const URL& url)
 {
-    main_frame().loader().load(url, FrameLoader::Type::Navigation);
+    top_level_browsing_context().loader().load(url, FrameLoader::Type::Navigation);
 }
 
 void Page::load(const LoadRequest& request)
 {
-    main_frame().loader().load(request, FrameLoader::Type::Navigation);
+    top_level_browsing_context().loader().load(request, FrameLoader::Type::Navigation);
 }
 
 void Page::load_html(const StringView& html, const URL& url)
 {
-    main_frame().loader().load_html(html, url);
+    top_level_browsing_context().loader().load_html(html, url);
 }
 
 Gfx::Palette Page::palette() const
@@ -59,27 +59,27 @@ Gfx::IntRect Page::screen_rect() const
 
 bool Page::handle_mousewheel(const Gfx::IntPoint& position, unsigned button, unsigned modifiers, int wheel_delta)
 {
-    return main_frame().event_handler().handle_mousewheel(position, button, modifiers, wheel_delta);
+    return top_level_browsing_context().event_handler().handle_mousewheel(position, button, modifiers, wheel_delta);
 }
 
 bool Page::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
 {
-    return main_frame().event_handler().handle_mouseup(position, button, modifiers);
+    return top_level_browsing_context().event_handler().handle_mouseup(position, button, modifiers);
 }
 
 bool Page::handle_mousedown(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
 {
-    return main_frame().event_handler().handle_mousedown(position, button, modifiers);
+    return top_level_browsing_context().event_handler().handle_mousedown(position, button, modifiers);
 }
 
 bool Page::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, unsigned modifiers)
 {
-    return main_frame().event_handler().handle_mousemove(position, buttons, modifiers);
+    return top_level_browsing_context().event_handler().handle_mousemove(position, buttons, modifiers);
 }
 
 bool Page::handle_keydown(KeyCode key, unsigned modifiers, u32 code_point)
 {
-    return focused_frame().event_handler().handle_keydown(key, modifiers, code_point);
+    return focused_context().event_handler().handle_keydown(key, modifiers, code_point);
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/Page/Page.h b/Userland/Libraries/LibWeb/Page/Page.h
index ba676b9a5a..b48d205003 100644
--- a/Userland/Libraries/LibWeb/Page/Page.h
+++ b/Userland/Libraries/LibWeb/Page/Page.h
@@ -33,13 +33,13 @@ public:
     PageClient& client() { return m_client; }
     const PageClient& client() const { return m_client; }
 
-    Web::Frame& main_frame() { return *m_main_frame; }
-    const Web::Frame& main_frame() const { return *m_main_frame; }
+    Web::BrowsingContext& top_level_browsing_context() { return *m_top_level_browsing_context; }
+    const Web::BrowsingContext& top_level_browsing_context() const { return *m_top_level_browsing_context; }
 
-    Web::Frame& focused_frame();
-    const Web::Frame& focused_frame() const { return const_cast<Page*>(this)->focused_frame(); }
+    Web::BrowsingContext& focused_context();
+    const Web::BrowsingContext& focused_context() const { return const_cast<Page*>(this)->focused_context(); }
 
-    void set_focused_frame(Badge<EventHandler>, Frame&);
+    void set_focused_browsing_context(Badge<EventHandler>, BrowsingContext&);
 
     void load(const URL&);
     void load(const LoadRequest&);
@@ -59,8 +59,8 @@ public:
 private:
     PageClient& m_client;
 
-    RefPtr<Frame> m_main_frame;
-    WeakPtr<Frame> m_focused_frame;
+    RefPtr<BrowsingContext> m_top_level_browsing_context;
+    WeakPtr<BrowsingContext> m_focused_context;
 };
 
 class PageClient {
@@ -68,7 +68,7 @@ public:
     virtual bool is_multi_process() const = 0;
     virtual Gfx::Palette palette() const = 0;
     virtual Gfx::IntRect screen_rect() const = 0;
-    virtual void page_did_set_document_in_main_frame(DOM::Document*) { }
+    virtual void page_did_set_document_in_top_level_browsing_context(DOM::Document*) { }
     virtual void page_did_change_title(const String&) { }
     virtual void page_did_start_loading(const URL&) { }
     virtual void page_did_finish_loading(const URL&) { }
diff --git a/Userland/Services/WebContent/ClientConnection.cpp b/Userland/Services/WebContent/ClientConnection.cpp
index 899273b622..093a5267d5 100644
--- a/Userland/Services/WebContent/ClientConnection.cpp
+++ b/Userland/Services/WebContent/ClientConnection.cpp
@@ -20,7 +20,7 @@
 #include <LibWeb/Dump.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Loader/ResourceLoader.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <WebContent/ClientConnection.h>
 #include <WebContent/PageHost.h>
 #include <WebContent/WebContentClientEndpoint.h>
@@ -171,19 +171,19 @@ void ClientConnection::key_down(i32 key, unsigned int modifiers, u32 code_point)
 void ClientConnection::debug_request(const String& request, const String& argument)
 {
     if (request == "dump-dom-tree") {
-        if (auto* doc = page().main_frame().document())
+        if (auto* doc = page().top_level_browsing_context().document())
             Web::dump_tree(*doc);
     }
 
     if (request == "dump-layout-tree") {
-        if (auto* doc = page().main_frame().document()) {
+        if (auto* doc = page().top_level_browsing_context().document()) {
             if (auto* icb = doc->layout_node())
                 Web::dump_tree(*icb);
         }
     }
 
     if (request == "dump-style-sheets") {
-        if (auto* doc = page().main_frame().document()) {
+        if (auto* doc = page().top_level_browsing_context().document()) {
             for (auto& sheet : doc->style_sheets().sheets()) {
                 Web::dump_sheet(sheet);
             }
@@ -197,7 +197,7 @@ void ClientConnection::debug_request(const String& request, const String& argume
     if (request == "set-line-box-borders") {
         bool state = argument == "on";
         m_page_host->set_should_show_line_box_borders(state);
-        page().main_frame().set_needs_display(page().main_frame().viewport_rect());
+        page().top_level_browsing_context().set_needs_display(page().top_level_browsing_context().viewport_rect());
     }
 
     if (request == "clear-cache") {
@@ -211,14 +211,14 @@ void ClientConnection::debug_request(const String& request, const String& argume
 
 void ClientConnection::get_source()
 {
-    if (auto* doc = page().main_frame().document()) {
+    if (auto* doc = page().top_level_browsing_context().document()) {
         async_did_get_source(doc->url(), doc->source());
     }
 }
 
 void ClientConnection::js_console_initialize()
 {
-    if (auto* document = page().main_frame().document()) {
+    if (auto* document = page().top_level_browsing_context().document()) {
         auto interpreter = document->interpreter().make_weak_ptr();
         if (m_interpreter.ptr() == interpreter.ptr())
             return;
diff --git a/Userland/Services/WebContent/PageHost.cpp b/Userland/Services/WebContent/PageHost.cpp
index 71df79afe7..26538b64f5 100644
--- a/Userland/Services/WebContent/PageHost.cpp
+++ b/Userland/Services/WebContent/PageHost.cpp
@@ -10,7 +10,7 @@
 #include <LibGfx/SystemTheme.h>
 #include <LibWeb/Cookie/ParsedCookie.h>
 #include <LibWeb/Layout/InitialContainingBlockBox.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <WebContent/WebContentClientEndpoint.h>
 
 namespace WebContent {
@@ -48,7 +48,7 @@ void PageHost::set_palette_impl(const Gfx::PaletteImpl& impl)
 
 Web::Layout::InitialContainingBlockBox* PageHost::layout_root()
 {
-    auto* document = page().main_frame().document();
+    auto* document = page().top_level_browsing_context().document();
     if (!document)
         return nullptr;
     return document->layout_node();
@@ -73,7 +73,7 @@ void PageHost::paint(const Gfx::IntRect& content_rect, Gfx::Bitmap& target)
 
 void PageHost::set_viewport_rect(const Gfx::IntRect& rect)
 {
-    page().main_frame().set_viewport_rect(rect);
+    page().top_level_browsing_context().set_viewport_rect(rect);
 }
 
 void PageHost::page_did_invalidate(const Gfx::IntRect& content_rect)