LibWeb: Rename LayoutNode classes and move them into Layout namespace

Bring the names of various boxes closer to spec language. This should
hopefully make things easier to understand and hack on. :^)

Some notable changes:

- LayoutNode -> Layout::Node
- LayoutBox -> Layout::Box
- LayoutBlock -> Layout::BlockBox
- LayoutReplaced -> Layout::ReplacedBox
- LayoutDocument -> Layout::InitialContainingBlockBox
- LayoutText -> Layout::TextNode
- LayoutInline -> Layout::InlineNode

Note that this is not strictly a "box tree" as we also hang inline/text
nodes in the same tree, and they don't generate boxes. (Instead, they
contribute line box fragments to their containing block!)

109 files changed, 854 insertions, 871 deletions

diff --git a/Libraries/LibWeb/CMakeLists.txt b/Libraries/LibWeb/CMakeLists.txt
index a164f3046c..f084378cd1 100644
--- a/Libraries/LibWeb/CMakeLists.txt
+++ b/Libraries/LibWeb/CMakeLists.txt
@@ -133,39 +133,39 @@ set(SOURCES
     HTML/Parser/StackOfOpenElements.cpp
     HighResolutionTime/Performance.cpp
     InProcessWebView.cpp
+    Layout/BlockBox.cpp
     Layout/BlockFormattingContext.cpp
+    Layout/Box.cpp
     Layout/BoxModelMetrics.cpp
+    Layout/BreakNode.cpp
+    Layout/ButtonBox.cpp
+    Layout/CanvasBox.cpp
+    Layout/CheckBox.cpp
     Layout/FormattingContext.cpp
+    Layout/FrameBox.cpp
+    Layout/ImageBox.cpp
+    Layout/InitialContainingBlockBox.cpp
     Layout/InlineFormattingContext.cpp
-    Layout/LayoutBlock.cpp
-    Layout/LayoutBox.cpp
-    Layout/LayoutBreak.cpp
-    Layout/LayoutButton.cpp
-    Layout/LayoutCanvas.cpp
-    Layout/LayoutCheckBox.cpp
-    Layout/LayoutDocument.cpp
-    Layout/LayoutFrame.cpp
-    Layout/LayoutImage.cpp
-    Layout/LayoutInline.cpp
-    Layout/LayoutListItem.cpp
-    Layout/LayoutListItemMarker.cpp
-    Layout/LayoutNode.cpp
+    Layout/InlineNode.cpp
     Layout/LayoutPosition.cpp
-    Layout/LayoutReplaced.cpp
-    Layout/LayoutSVG.cpp
-    Layout/LayoutSVGGraphics.cpp
-    Layout/LayoutSVGPath.cpp
-    Layout/LayoutSVGSVG.cpp
-    Layout/LayoutTable.cpp
-    Layout/LayoutTableCell.cpp
-    Layout/LayoutTableRow.cpp
-    Layout/LayoutTableRowGroup.cpp
-    Layout/LayoutText.cpp
     Layout/LayoutTreeBuilder.cpp
-    Layout/LayoutWidget.cpp
     Layout/LineBox.cpp
     Layout/LineBoxFragment.cpp
+    Layout/ListItemBox.cpp
+    Layout/ListItemMarkerBox.cpp
+    Layout/Node.cpp
+    Layout/ReplacedBox.cpp
+    Layout/SVGBox.cpp
+    Layout/SVGGraphicsBox.cpp
+    Layout/SVGPathBox.cpp
+    Layout/SVGSVGBox.cpp
+    Layout/TableBox.cpp
+    Layout/TableCellBox.cpp
     Layout/TableFormattingContext.cpp
+    Layout/TableRowBox.cpp
+    Layout/TableRowGroupBox.cpp
+    Layout/TextNode.cpp
+    Layout/WidgetBox.cpp
     LayoutTreeModel.cpp
     Loader/FrameLoader.cpp
     Loader/ImageLoader.cpp
diff --git a/Libraries/LibWeb/CSS/Length.cpp b/Libraries/LibWeb/CSS/Length.cpp
index 412fa7c3d0..dd85754ec2 100644
--- a/Libraries/LibWeb/CSS/Length.cpp
+++ b/Libraries/LibWeb/CSS/Length.cpp
@@ -31,7 +31,7 @@
 
 namespace Web::CSS {
 
-float Length::relative_length_to_px(const LayoutNode& layout_node) const
+float Length::relative_length_to_px(const Layout::Node& layout_node) const
 {
     switch (m_type) {
     case Type::Ex:
diff --git a/Libraries/LibWeb/CSS/Length.h b/Libraries/LibWeb/CSS/Length.h
index 227e357204..ec781aee6d 100644
--- a/Libraries/LibWeb/CSS/Length.h
+++ b/Libraries/LibWeb/CSS/Length.h
@@ -68,7 +68,7 @@ public:
     static Length make_auto() { return Length(0, Type::Auto); }
     static Length make_px(float value) { return Length(value, Type::Px); }
 
-    Length resolved(const Length& fallback_for_undefined, const LayoutNode& layout_node, float reference_for_percent) const
+    Length resolved(const Length& fallback_for_undefined, const Layout::Node& layout_node, float reference_for_percent) const
     {
         if (is_undefined())
             return fallback_for_undefined;
@@ -79,12 +79,12 @@ public:
         return *this;
     }
 
-    Length resolved_or_auto(const LayoutNode& layout_node, float reference_for_percent) const
+    Length resolved_or_auto(const Layout::Node& layout_node, float reference_for_percent) const
     {
         return resolved(make_auto(), layout_node, reference_for_percent);
     }
 
-    Length resolved_or_zero(const LayoutNode& layout_node, float reference_for_percent) const
+    Length resolved_or_zero(const Layout::Node& layout_node, float reference_for_percent) const
     {
         return resolved(make_px(0), layout_node, reference_for_percent);
     }
@@ -117,7 +117,7 @@ public:
     }
 
     float raw_value() const { return m_value; }
-    ALWAYS_INLINE float to_px(const LayoutNode& layout_node) const
+    ALWAYS_INLINE float to_px(const Layout::Node& layout_node) const
     {
         if (is_relative())
             return relative_length_to_px(layout_node);
@@ -155,7 +155,7 @@ public:
     }
 
 private:
-    float relative_length_to_px(const LayoutNode&) const;
+    float relative_length_to_px(const Layout::Node&) const;
 
     const char* unit_name() const;
 
diff --git a/Libraries/LibWeb/CSS/StyleProperties.cpp b/Libraries/LibWeb/CSS/StyleProperties.cpp
index c0b40984b3..0f1db911bf 100644
--- a/Libraries/LibWeb/CSS/StyleProperties.cpp
+++ b/Libraries/LibWeb/CSS/StyleProperties.cpp
@@ -173,7 +173,7 @@ void StyleProperties::load_font() const
     FontCache::the().set({ font_family, font_weight }, *m_font);
 }
 
-float StyleProperties::line_height(const LayoutNode& layout_node) const
+float StyleProperties::line_height(const Layout::Node& layout_node) const
 {
     auto line_height_length = length_or_fallback(CSS::PropertyID::LineHeight, Length::make_auto());
     if (line_height_length.is_absolute())
diff --git a/Libraries/LibWeb/CSS/StyleProperties.h b/Libraries/LibWeb/CSS/StyleProperties.h
index 472d53da07..8622fea9ca 100644
--- a/Libraries/LibWeb/CSS/StyleProperties.h
+++ b/Libraries/LibWeb/CSS/StyleProperties.h
@@ -72,7 +72,7 @@ public:
         return *m_font;
     }
 
-    float line_height(const LayoutNode&) const;
+    float line_height(const Layout::Node&) const;
 
     bool operator==(const StyleProperties&) const;
     bool operator!=(const StyleProperties& other) const { return !(*this == other); }
diff --git a/Libraries/LibWeb/DOM/Comment.cpp b/Libraries/LibWeb/DOM/Comment.cpp
index 0814bd0bf6..7e3f0ab8d2 100644
--- a/Libraries/LibWeb/DOM/Comment.cpp
+++ b/Libraries/LibWeb/DOM/Comment.cpp
@@ -25,7 +25,7 @@
  */
 
 #include <LibWeb/DOM/Comment.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/TextNode.h>
 
 namespace Web::DOM {
 
diff --git a/Libraries/LibWeb/DOM/Document.cpp b/Libraries/LibWeb/DOM/Document.cpp
index 0a1fe0e506..c7b00c14ee 100644
--- a/Libraries/LibWeb/DOM/Document.cpp
+++ b/Libraries/LibWeb/DOM/Document.cpp
@@ -54,7 +54,7 @@
 #include <LibWeb/HTML/HTMLTitleElement.h>
 #include <LibWeb/InProcessWebView.h>
 #include <LibWeb/Layout/BlockFormattingContext.h>
-#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/LayoutTreeBuilder.h>
 #include <LibWeb/Namespace.h>
 #include <LibWeb/Origin.h>
@@ -271,7 +271,7 @@ void Document::tear_down_layout_tree()
     // Gather up all the layout nodes in a vector and detach them from parents
     // while the vector keeps them alive.
 
-    NonnullRefPtrVector<LayoutNode> layout_nodes;
+    NonnullRefPtrVector<Layout::Node> layout_nodes;
 
     m_layout_root->for_each_in_subtree([&](auto& layout_node) {
         layout_nodes.append(layout_node);
@@ -347,12 +347,12 @@ void Document::layout()
         return;
 
     if (!m_layout_root) {
-        LayoutTreeBuilder tree_builder;
-        m_layout_root = static_ptr_cast<LayoutDocument>(tree_builder.build(*this));
+        Layout::LayoutTreeBuilder tree_builder;
+        m_layout_root = static_ptr_cast<Layout::InitialContainingBlockBox>(tree_builder.build(*this));
     }
 
     Layout::BlockFormattingContext root_formatting_context(*m_layout_root);
-    root_formatting_context.run(LayoutMode::Default);
+    root_formatting_context.run(Layout::LayoutMode::Default);
 
     m_layout_root->set_needs_display();
 
@@ -380,9 +380,9 @@ void Document::update_layout()
     layout();
 }
 
-RefPtr<LayoutNode> Document::create_layout_node(const CSS::StyleProperties*)
+RefPtr<Layout::Node> Document::create_layout_node(const CSS::StyleProperties*)
 {
-    return adopt(*new LayoutDocument(*this, CSS::StyleProperties::create()));
+    return adopt(*new Layout::InitialContainingBlockBox(*this, CSS::StyleProperties::create()));
 }
 
 void Document::set_link_color(Color color)
@@ -400,14 +400,14 @@ void Document::set_visited_link_color(Color color)
     m_visited_link_color = color;
 }
 
-const LayoutDocument* Document::layout_node() const
+const Layout::InitialContainingBlockBox* Document::layout_node() const
 {
-    return static_cast<const LayoutDocument*>(Node::layout_node());
+    return static_cast<const Layout::InitialContainingBlockBox*>(Node::layout_node());
 }
 
-LayoutDocument* Document::layout_node()
+Layout::InitialContainingBlockBox* Document::layout_node()
 {
-    return static_cast<LayoutDocument*>(Node::layout_node());
+    return static_cast<Layout::InitialContainingBlockBox*>(Node::layout_node());
 }
 
 void Document::set_inspected_node(Node* node)
diff --git a/Libraries/LibWeb/DOM/Document.h b/Libraries/LibWeb/DOM/Document.h
index c3d4dc523c..cb400bd6e2 100644
--- a/Libraries/LibWeb/DOM/Document.h
+++ b/Libraries/LibWeb/DOM/Document.h
@@ -125,8 +125,8 @@ public:
 
     virtual bool is_child_allowed(const Node&) const override;
 
-    const LayoutDocument* layout_node() const;
-    LayoutDocument* layout_node();
+    const Layout::InitialContainingBlockBox* layout_node() const;
+    Layout::InitialContainingBlockBox* layout_node();
 
     void schedule_style_update();
 
@@ -212,7 +212,7 @@ public:
 private:
     explicit Document(const URL&);
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     void tear_down_layout_tree();
 
@@ -244,7 +244,7 @@ private:
 
     RefPtr<Window> m_window;
 
-    RefPtr<LayoutDocument> m_layout_root;
+    RefPtr<Layout::InitialContainingBlockBox> m_layout_root;
 
     Optional<Color> m_link_color;
     Optional<Color> m_active_link_color;
diff --git a/Libraries/LibWeb/DOM/Element.cpp b/Libraries/LibWeb/DOM/Element.cpp
index 51b77ea9f7..7e0ab56d8f 100644
--- a/Libraries/LibWeb/DOM/Element.cpp
+++ b/Libraries/LibWeb/DOM/Element.cpp
@@ -34,14 +34,14 @@
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/HTML/Parser/HTMLDocumentParser.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutInline.h>
-#include <LibWeb/Layout/LayoutListItem.h>
-#include <LibWeb/Layout/LayoutTable.h>
-#include <LibWeb/Layout/LayoutTableCell.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
-#include <LibWeb/Layout/LayoutTableRowGroup.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/InlineNode.h>
 #include <LibWeb/Layout/LayoutTreeBuilder.h>
+#include <LibWeb/Layout/ListItemBox.h>
+#include <LibWeb/Layout/TableBox.h>
+#include <LibWeb/Layout/TableCellBox.h>
+#include <LibWeb/Layout/TableRowBox.h>
+#include <LibWeb/Layout/TableRowGroupBox.h>
 
 namespace Web::DOM {
 
@@ -112,7 +112,7 @@ bool Element::has_class(const FlyString& class_name) const
     return false;
 }
 
-RefPtr<LayoutNode> Element::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> Element::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
     const_cast<Element&>(*this).m_resolved_style = style;
@@ -125,26 +125,26 @@ RefPtr<LayoutNode> Element::create_layout_node(const CSS::StyleProperties* paren
         return nullptr;
 
     if (display == CSS::Display::Block)
-        return adopt(*new LayoutBlock(document(), this, move(style)));
+        return adopt(*new Layout::BlockBox(document(), this, move(style)));
 
     if (display == CSS::Display::Inline) {
         if (style->float_().value_or(CSS::Float::None) != CSS::Float::None)
-            return adopt(*new LayoutBlock(document(), this, move(style)));
-        return adopt(*new LayoutInline(document(), *this, move(style)));
+            return adopt(*new Layout::BlockBox(document(), this, move(style)));
+        return adopt(*new Layout::InlineNode(document(), *this, move(style)));
     }
 
     if (display == CSS::Display::ListItem)
-        return adopt(*new LayoutListItem(document(), *this, move(style)));
+        return adopt(*new Layout::ListItemBox(document(), *this, move(style)));
     if (display == CSS::Display::Table)
-        return adopt(*new LayoutTable(document(), *this, move(style)));
+        return adopt(*new Layout::TableBox(document(), *this, move(style)));
     if (display == CSS::Display::TableRow)
-        return adopt(*new LayoutTableRow(document(), *this, move(style)));
+        return adopt(*new Layout::TableRowBox(document(), *this, move(style)));
     if (display == CSS::Display::TableCell)
-        return adopt(*new LayoutTableCell(document(), *this, move(style)));
+        return adopt(*new Layout::TableCellBox(document(), *this, move(style)));
     if (display == CSS::Display::TableRowGroup || display == CSS::Display::TableHeaderGroup || display == CSS::Display::TableFooterGroup)
-        return adopt(*new LayoutTableRowGroup(document(), *this, move(style)));
+        return adopt(*new Layout::TableRowGroupBox(document(), *this, move(style)));
     if (display == CSS::Display::InlineBlock) {
-        auto inline_block = adopt(*new LayoutBlock(document(), this, move(style)));
+        auto inline_block = adopt(*new Layout::BlockBox(document(), this, move(style)));
         inline_block->set_inline(true);
         return inline_block;
     }
@@ -206,7 +206,7 @@ void Element::recompute_style()
         if (style->display() == CSS::Display::None)
             return;
         // We need a new layout tree here!
-        LayoutTreeBuilder tree_builder;
+        Layout::LayoutTreeBuilder tree_builder;
         tree_builder.build(*this);
         return;
     }
diff --git a/Libraries/LibWeb/DOM/Element.h b/Libraries/LibWeb/DOM/Element.h
index 467ca8263e..d9b704f841 100644
--- a/Libraries/LibWeb/DOM/Element.h
+++ b/Libraries/LibWeb/DOM/Element.h
@@ -33,7 +33,7 @@
 #include <LibWeb/DOM/ParentNode.h>
 #include <LibWeb/DOM/TagNames.h>
 #include <LibWeb/HTML/AttributeNames.h>
-#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Layout/Node.h>
 #include <LibWeb/QualifiedName.h>
 
 namespace Web::DOM {
@@ -82,8 +82,8 @@ public:
 
     void recompute_style();
 
-    LayoutNodeWithStyle* layout_node() { return static_cast<LayoutNodeWithStyle*>(Node::layout_node()); }
-    const LayoutNodeWithStyle* layout_node() const { return static_cast<const LayoutNodeWithStyle*>(Node::layout_node()); }
+    Layout::NodeWithStyle* layout_node() { return static_cast<Layout::NodeWithStyle*>(Node::layout_node()); }
+    const Layout::NodeWithStyle* layout_node() const { return static_cast<const Layout::NodeWithStyle*>(Node::layout_node()); }
 
     String name() const { return attribute(HTML::AttributeNames::name); }
 
@@ -97,7 +97,7 @@ public:
     virtual bool is_focusable() const { return false; }
 
 protected:
-    RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
 private:
     Attribute* find_attribute(const FlyString& name);
diff --git a/Libraries/LibWeb/DOM/Node.cpp b/Libraries/LibWeb/DOM/Node.cpp
index c81bebf7b8..318e8ebf98 100644
--- a/Libraries/LibWeb/DOM/Node.cpp
+++ b/Libraries/LibWeb/DOM/Node.cpp
@@ -39,11 +39,11 @@
 #include <LibWeb/DOM/EventListener.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/HTML/HTMLAnchorElement.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutInline.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/InlineNode.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/TextNode.h>
 
 //#define EVENT_DEBUG
 
@@ -105,7 +105,7 @@ void Node::set_text_content(const String& content)
     document().invalidate_layout();
 }
 
-RefPtr<LayoutNode> Node::create_layout_node(const CSS::StyleProperties*)
+RefPtr<Layout::Node> Node::create_layout_node(const CSS::StyleProperties*)
 {
     return nullptr;
 }
@@ -230,7 +230,7 @@ void Node::removed_last_ref()
     delete this;
 }
 
-void Node::set_layout_node(Badge<LayoutNode>, LayoutNode* layout_node) const
+void Node::set_layout_node(Badge<Layout::Node>, Layout::Node* layout_node) const
 {
     if (layout_node)
         m_layout_node = layout_node->make_weak_ptr();
diff --git a/Libraries/LibWeb/DOM/Node.h b/Libraries/LibWeb/DOM/Node.h
index 9b2573c3fc..a415b17d4b 100644
--- a/Libraries/LibWeb/DOM/Node.h
+++ b/Libraries/LibWeb/DOM/Node.h
@@ -84,7 +84,7 @@ public:
     RefPtr<Node> insert_before(NonnullRefPtr<Node> node, RefPtr<Node> child, bool notify = true);
     void remove_all_children();
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style);
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style);
 
     virtual FlyString node_name() const = 0;
 
@@ -115,10 +115,10 @@ public:
     virtual void removed_from(Node&) { }
     virtual void children_changed() { }
 
-    const LayoutNode* layout_node() const { return m_layout_node; }
-    LayoutNode* layout_node() { return m_layout_node; }
+    const Layout::Node* layout_node() const { return m_layout_node; }
+    Layout::Node* layout_node() { return m_layout_node; }
 
-    void set_layout_node(Badge<LayoutNode>, LayoutNode*) const;
+    void set_layout_node(Badge<Layout::Node>, Layout::Node*) const;
 
     virtual bool is_child_allowed(const Node&) const { return true; }
 
@@ -138,7 +138,7 @@ protected:
     Node(Document&, NodeType);
 
     Document* m_document { nullptr };
-    mutable WeakPtr<LayoutNode> m_layout_node;
+    mutable WeakPtr<Layout::Node> m_layout_node;
     NodeType m_type { NodeType::INVALID };
     bool m_needs_style_update { true };
 };
diff --git a/Libraries/LibWeb/DOM/Text.cpp b/Libraries/LibWeb/DOM/Text.cpp
index 043998538e..a0c6ba9dab 100644
--- a/Libraries/LibWeb/DOM/Text.cpp
+++ b/Libraries/LibWeb/DOM/Text.cpp
@@ -25,7 +25,7 @@
  */
 
 #include <LibWeb/DOM/Text.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/TextNode.h>
 
 namespace Web::DOM {
 
@@ -38,9 +38,9 @@ Text::~Text()
 {
 }
 
-RefPtr<LayoutNode> Text::create_layout_node(const CSS::StyleProperties*)
+RefPtr<Layout::Node> Text::create_layout_node(const CSS::StyleProperties*)
 {
-    return adopt(*new LayoutText(document(), *this));
+    return adopt(*new Layout::TextNode(document(), *this));
 }
 
 }
diff --git a/Libraries/LibWeb/DOM/Text.h b/Libraries/LibWeb/DOM/Text.h
index 8ba78b7179..1b73543974 100644
--- a/Libraries/LibWeb/DOM/Text.h
+++ b/Libraries/LibWeb/DOM/Text.h
@@ -42,7 +42,7 @@ public:
     virtual FlyString node_name() const override { return "#text"; }
 
 private:
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 };
 
 }
diff --git a/Libraries/LibWeb/Dump.cpp b/Libraries/LibWeb/Dump.cpp
index d2eb66758a..5318fd7200 100644
--- a/Libraries/LibWeb/Dump.cpp
+++ b/Libraries/LibWeb/Dump.cpp
@@ -37,9 +37,9 @@
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/HTML/HTMLTemplateElement.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <stdio.h>
 
 namespace Web {
@@ -80,7 +80,7 @@ void dump_tree(const DOM::Node& node)
     --indent;
 }
 
-void dump_tree(const LayoutNode& layout_node)
+void dump_tree(const Layout::Node& layout_node)
 {
     static size_t indent = 0;
     for (size_t i = 0; i < indent; ++i)
@@ -117,7 +117,7 @@ void dump_tree(const LayoutNode& layout_node)
     if (!layout_node.is_box()) {
         dbgprintf("%s {\033[33m%s\033[0m%s}\n", layout_node.class_name(), tag_name.characters(), identifier.characters());
     } else {
-        auto& layout_box = downcast<LayoutBox>(layout_node);
+        auto& layout_box = downcast<Layout::Box>(layout_node);
         dbgprintf("%s {\033[34m%s\033[0m%s} at (%g,%g) size %gx%g",
             layout_box.class_name(),
             tag_name.characters(),
@@ -150,8 +150,8 @@ void dump_tree(const LayoutNode& layout_node)
         dbgprintf("\n");
     }
 
-    if (layout_node.is_block() && static_cast<const LayoutBlock&>(layout_node).children_are_inline()) {
-        auto& block = static_cast<const LayoutBlock&>(layout_node);
+    if (layout_node.is_block() && static_cast<const Layout::BlockBox&>(layout_node).children_are_inline()) {
+        auto& block = static_cast<const Layout::BlockBox&>(layout_node);
         for (size_t i = 0; i < indent; ++i)
             dbgprintf("    ");
         dbgprintf("  Line boxes (%d):\n", block.line_boxes().size());
@@ -174,7 +174,7 @@ void dump_tree(const LayoutNode& layout_node)
                 if (fragment.layout_node().is_text()) {
                     for (size_t i = 0; i < indent; ++i)
                         dbgprintf("    ");
-                    auto& layout_text = static_cast<const LayoutText&>(fragment.layout_node());
+                    auto& layout_text = static_cast<const Layout::TextNode&>(fragment.layout_node());
                     auto fragment_text = layout_text.text_for_rendering().substring(fragment.start(), fragment.length());
                     dbgprintf("        text: \"%s\"\n", fragment_text.characters());
                 }
diff --git a/Libraries/LibWeb/Dump.h b/Libraries/LibWeb/Dump.h
index 6bb1594837..df0164a6f0 100644
--- a/Libraries/LibWeb/Dump.h
+++ b/Libraries/LibWeb/Dump.h
@@ -31,7 +31,7 @@
 namespace Web {
 
 void dump_tree(const DOM::Node&);
-void dump_tree(const LayoutNode&);
+void dump_tree(const Layout::Node&);
 void dump_sheet(const CSS::StyleSheet&);
 void dump_rule(const CSS::StyleRule&);
 void dump_selector(const CSS::Selector&);
diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index ed56031c91..741752a4d0 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -26,10 +26,6 @@
 
 #pragma once
 
-namespace Web {
-enum class LayoutMode;
-}
-
 namespace Web::CSS {
 class Selector;
 class StyleProperties;
@@ -151,9 +147,18 @@ class SVGSVGElement;
 }
 
 namespace Web::Layout {
+enum class LayoutMode;
+class BlockBox;
 class BlockFormattingContext;
+class Box;
+class ButtonBox;
+class CheckBox;
+class InitialContainingBlockBox;
 class FormattingContext;
 class InlineFormattingContext;
+class Node;
+class NodeWithStyle;
+class ReplacedBox;
 }
 
 namespace Web {
@@ -161,14 +166,6 @@ class EventHandler;
 class Frame;
 class FrameLoader;
 class InProcessWebView;
-class LayoutBlock;
-class LayoutBox;
-class LayoutButton;
-class LayoutCheckBox;
-class LayoutDocument;
-class LayoutNode;
-class LayoutNodeWithStyle;
-class LayoutReplaced;
 class LineBox;
 class LineBoxFragment;
 class LoadRequest;
diff --git a/Libraries/LibWeb/HTML/HTMLBRElement.cpp b/Libraries/LibWeb/HTML/HTMLBRElement.cpp
index 9774430ca5..3d7e7e5eec 100644
--- a/Libraries/LibWeb/HTML/HTMLBRElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLBRElement.cpp
@@ -25,7 +25,7 @@
  */
 
 #include <LibWeb/HTML/HTMLBRElement.h>
-#include <LibWeb/Layout/LayoutBreak.h>
+#include <LibWeb/Layout/BreakNode.h>
 
 namespace Web::HTML {
 
@@ -38,9 +38,9 @@ HTMLBRElement::~HTMLBRElement()
 {
 }
 
-RefPtr<LayoutNode> HTMLBRElement::create_layout_node(const CSS::StyleProperties*)
+RefPtr<Layout::Node> HTMLBRElement::create_layout_node(const CSS::StyleProperties*)
 {
-    return adopt(*new LayoutBreak(document(), *this));
+    return adopt(*new Layout::BreakNode(document(), *this));
 }
 
 }
diff --git a/Libraries/LibWeb/HTML/HTMLBRElement.h b/Libraries/LibWeb/HTML/HTMLBRElement.h
index 1529e35634..8a6cd81641 100644
--- a/Libraries/LibWeb/HTML/HTMLBRElement.h
+++ b/Libraries/LibWeb/HTML/HTMLBRElement.h
@@ -37,7 +37,7 @@ public:
     HTMLBRElement(DOM::Document&, const QualifiedName& qualified_name);
     virtual ~HTMLBRElement() override;
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 };
 
 }
diff --git a/Libraries/LibWeb/HTML/HTMLBlinkElement.cpp b/Libraries/LibWeb/HTML/HTMLBlinkElement.cpp
index ab41c20f26..911a8940bd 100644
--- a/Libraries/LibWeb/HTML/HTMLBlinkElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLBlinkElement.cpp
@@ -28,7 +28,7 @@
 #include <LibWeb/CSS/StyleProperties.h>
 #include <LibWeb/CSS/StyleValue.h>
 #include <LibWeb/HTML/HTMLBlinkElement.h>
-#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Layout/Node.h>
 
 namespace Web::HTML {
 
diff --git a/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp b/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
index a30c9a3ed5..bbad3a0657 100644
--- a/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
@@ -30,7 +30,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/CanvasRenderingContext2D.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
-#include <LibWeb/Layout/LayoutCanvas.h>
+#include <LibWeb/Layout/CanvasBox.h>
 
 namespace Web::HTML {
 
@@ -55,12 +55,12 @@ unsigned HTMLCanvasElement::height() const
     return attribute(HTML::AttributeNames::height).to_uint().value_or(150);
 }
 
-RefPtr<LayoutNode> HTMLCanvasElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> HTMLCanvasElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
     if (style->display() == CSS::Display::None)
         return nullptr;
-    return adopt(*new LayoutCanvas(document(), *this, move(style)));
+    return adopt(*new Layout::CanvasBox(document(), *this, move(style)));
 }
 
 CanvasRenderingContext2D* HTMLCanvasElement::get_context(String type)
diff --git a/Libraries/LibWeb/HTML/HTMLCanvasElement.h b/Libraries/LibWeb/HTML/HTMLCanvasElement.h
index 75f9b17008..4bcb8b0914 100644
--- a/Libraries/LibWeb/HTML/HTMLCanvasElement.h
+++ b/Libraries/LibWeb/HTML/HTMLCanvasElement.h
@@ -32,8 +32,6 @@
 
 namespace Web::HTML {
 
-class LayoutDocument;
-
 class HTMLCanvasElement final : public HTMLElement {
 public:
     using WrapperType = Bindings::HTMLCanvasElementWrapper;
@@ -51,7 +49,7 @@ public:
     unsigned height() const;
 
 private:
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     RefPtr<Gfx::Bitmap> m_bitmap;
     RefPtr<CanvasRenderingContext2D> m_context;
diff --git a/Libraries/LibWeb/HTML/HTMLElement.cpp b/Libraries/LibWeb/HTML/HTMLElement.cpp
index edf35366df..bb364a19a3 100644
--- a/Libraries/LibWeb/HTML/HTMLElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLElement.cpp
@@ -27,7 +27,7 @@
 #include <AK/StringBuilder.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLElement.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/TextNode.h>
 
 namespace Web::HTML {
 
@@ -117,10 +117,10 @@ String HTMLElement::inner_text()
     if (!layout_node())
         return text_content();
 
-    Function<void(const LayoutNode&)> recurse = [&](auto& node) {
+    Function<void(const Layout::Node&)> recurse = [&](auto& node) {
         for (auto* child = node.first_child(); child; child = child->next_sibling()) {
             if (child->is_text())
-                builder.append(downcast<LayoutText>(*child).text_for_rendering());
+                builder.append(downcast<Layout::TextNode>(*child).text_for_rendering());
             if (child->is_break())
                 builder.append('\n');
             recurse(*child);
diff --git a/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp b/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
index 8577f364d3..115783b747 100644
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@@ -35,8 +35,7 @@
 #include <LibWeb/HTML/HTMLIFrameElement.h>
 #include <LibWeb/HTML/Parser/HTMLDocumentParser.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutFrame.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/FrameBox.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/Origin.h>
 #include <LibWeb/Page/Frame.h>
@@ -52,10 +51,10 @@ HTMLIFrameElement::~HTMLIFrameElement()
 {
 }
 
-RefPtr<LayoutNode> HTMLIFrameElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> HTMLIFrameElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
-    return adopt(*new LayoutFrame(document(), *this, move(style)));
+    return adopt(*new Layout::FrameBox(document(), *this, move(style)));
 }
 
 void HTMLIFrameElement::document_did_attach_to_frame(Frame& frame)
diff --git a/Libraries/LibWeb/HTML/HTMLIFrameElement.h b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
index 71c0746b0c..f3f96d40fb 100644
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
@@ -37,7 +37,7 @@ public:
     HTMLIFrameElement(DOM::Document&, const QualifiedName& qualified_name);
     virtual ~HTMLIFrameElement() override;
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     Frame* content_frame() { return m_content_frame; }
     const Frame* content_frame() const { return m_content_frame; }
diff --git a/Libraries/LibWeb/HTML/HTMLImageElement.cpp b/Libraries/LibWeb/HTML/HTMLImageElement.cpp
index 9d9439d0ce..d78f911fcf 100644
--- a/Libraries/LibWeb/HTML/HTMLImageElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLImageElement.cpp
@@ -31,7 +31,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
-#include <LibWeb/Layout/LayoutImage.h>
+#include <LibWeb/Layout/ImageBox.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 
 namespace Web::HTML {
@@ -83,12 +83,12 @@ void HTMLImageElement::parse_attribute(const FlyString& name, const String& valu
         m_image_loader.load(document().complete_url(value));
 }
 
-RefPtr<LayoutNode> HTMLImageElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> HTMLImageElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
     if (style->display() == CSS::Display::None)
         return nullptr;
-    return adopt(*new LayoutImage(document(), *this, move(style), m_image_loader));
+    return adopt(*new Layout::ImageBox(document(), *this, move(style), m_image_loader));
 }
 
 const Gfx::Bitmap* HTMLImageElement::bitmap() const
diff --git a/Libraries/LibWeb/HTML/HTMLImageElement.h b/Libraries/LibWeb/HTML/HTMLImageElement.h
index 011296ad93..a07762bd63 100644
--- a/Libraries/LibWeb/HTML/HTMLImageElement.h
+++ b/Libraries/LibWeb/HTML/HTMLImageElement.h
@@ -53,7 +53,7 @@ private:
 
     void animate();
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     ImageLoader m_image_loader;
 };
diff --git a/Libraries/LibWeb/HTML/HTMLInputElement.cpp b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
index 3ab1443e6e..70e87f7eb8 100644
--- a/Libraries/LibWeb/HTML/HTMLInputElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
@@ -31,9 +31,9 @@
 #include <LibWeb/HTML/HTMLFormElement.h>
 #include <LibWeb/HTML/HTMLInputElement.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutButton.h>
-#include <LibWeb/Layout/LayoutCheckBox.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/ButtonBox.h>
+#include <LibWeb/Layout/CheckBox.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <LibWeb/Page/Frame.h>
 
 namespace Web::HTML {
@@ -47,7 +47,7 @@ HTMLInputElement::~HTMLInputElement()
 {
 }
 
-void HTMLInputElement::did_click_button(Badge<LayoutButton>)
+void HTMLInputElement::did_click_button(Badge<Layout::ButtonBox>)
 {
     dispatch_event(DOM::Event::create("click"));
 
@@ -60,7 +60,7 @@ void HTMLInputElement::did_click_button(Badge<LayoutButton>)
     }
 }
 
-RefPtr<LayoutNode> HTMLInputElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> HTMLInputElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     ASSERT(document().page());
     auto& page = *document().page();
@@ -74,15 +74,15 @@ RefPtr<LayoutNode> HTMLInputElement::create_layout_node(const CSS::StyleProperti
         return nullptr;
 
     if (type().equals_ignoring_case("submit") || type().equals_ignoring_case("button"))
-        return adopt(*new LayoutButton(document(), *this, move(style)));
+        return adopt(*new Layout::ButtonBox(document(), *this, move(style)));
 
     if (type() == "checkbox")
-        return adopt(*new LayoutCheckBox(document(), *this, move(style)));
+        return adopt(*new Layout::CheckBox(document(), *this, move(style)));
 
     auto& text_box = page_view.add<GUI::TextBox>();
     text_box.set_text(value());
     text_box.on_change = [this] {
-        auto& widget = downcast<LayoutWidget>(layout_node())->widget();
+        auto& widget = downcast<Layout::WidgetBox>(layout_node())->widget();
         const_cast<HTMLInputElement*>(this)->set_attribute(HTML::AttributeNames::value, static_cast<const GUI::TextBox&>(widget).text());
     };
     int text_width = Gfx::Font::default_font().width(value());
@@ -93,7 +93,7 @@ RefPtr<LayoutNode> HTMLInputElement::create_layout_node(const CSS::StyleProperti
             text_width = Gfx::Font::default_font().glyph_width('x') * size.value();
     }
     text_box.set_relative_rect(0, 0, text_width + 20, 20);
-    return adopt(*new LayoutWidget(document(), *this, text_box));
+    return adopt(*new Layout::WidgetBox(document(), *this, text_box));
 }
 
 void HTMLInputElement::set_checked(bool checked)
diff --git a/Libraries/LibWeb/HTML/HTMLInputElement.h b/Libraries/LibWeb/HTML/HTMLInputElement.h
index 1ff40da6f6..84e0ecf1c1 100644
--- a/Libraries/LibWeb/HTML/HTMLInputElement.h
+++ b/Libraries/LibWeb/HTML/HTMLInputElement.h
@@ -37,7 +37,7 @@ public:
     HTMLInputElement(DOM::Document&, const QualifiedName& qualified_name);
     virtual ~HTMLInputElement() override;
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     String type() const { return attribute(HTML::AttributeNames::type); }
     String value() const { return attribute(HTML::AttributeNames::value); }
@@ -48,7 +48,7 @@ public:
 
     bool enabled() const;
 
-    void did_click_button(Badge<LayoutButton>);
+    void did_click_button(Badge<Layout::ButtonBox>);
 
 private:
     bool m_checked { false };
diff --git a/Libraries/LibWeb/HTML/HTMLObjectElement.cpp b/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
index e5f7ab2fd5..4a3d0a11d4 100644
--- a/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
@@ -30,7 +30,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/HTML/HTMLObjectElement.h>
-#include <LibWeb/Layout/LayoutImage.h>
+#include <LibWeb/Layout/ImageBox.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 
 namespace Web::HTML {
@@ -61,7 +61,7 @@ void HTMLObjectElement::parse_attribute(const FlyString& name, const String& val
         m_image_loader.load(document().complete_url(value));
 }
 
-RefPtr<LayoutNode> HTMLObjectElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> HTMLObjectElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     if (m_should_show_fallback_content)
         return HTMLElement::create_layout_node(parent_style);
@@ -70,7 +70,7 @@ RefPtr<LayoutNode> HTMLObjectElement::create_layout_node(const CSS::StylePropert
     if (style->display() == CSS::Display::None)
         return nullptr;
     if (m_image_loader.has_image())
-        return adopt(*new LayoutImage(document(), *this, move(style), m_image_loader));
+        return adopt(*new Layout::ImageBox(document(), *this, move(style), m_image_loader));
     return nullptr;
 }
 
diff --git a/Libraries/LibWeb/HTML/HTMLObjectElement.h b/Libraries/LibWeb/HTML/HTMLObjectElement.h
index 967ada32cc..7497604623 100644
--- a/Libraries/LibWeb/HTML/HTMLObjectElement.h
+++ b/Libraries/LibWeb/HTML/HTMLObjectElement.h
@@ -46,7 +46,7 @@ public:
     String type() const { return attribute(HTML::AttributeNames::type); }
 
 private:
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     ImageLoader m_image_loader;
     bool m_should_show_fallback_content { false };
diff --git a/Libraries/LibWeb/InProcessWebView.cpp b/Libraries/LibWeb/InProcessWebView.cpp
index 2580f80b4e..88fe767009 100644
--- a/Libraries/LibWeb/InProcessWebView.cpp
+++ b/Libraries/LibWeb/InProcessWebView.cpp
@@ -46,10 +46,10 @@
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/HTML/Parser/HTMLDocumentParser.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutBreak.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/BreakNode.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <LibWeb/Loader/ResourceLoader.h>
 #include <LibWeb/Page/EventHandler.h>
 #include <LibWeb/Page/Frame.h>
@@ -89,21 +89,21 @@ void InProcessWebView::select_all()
     if (!layout_root)
         return;
 
-    const LayoutNode* first_layout_node = layout_root;
+    const Layout::Node* first_layout_node = layout_root;
 
     for (;;) {
         auto* next = first_layout_node->next_in_pre_order();
         if (!next)
             break;
         first_layout_node = next;
-        if (is<LayoutText>(*first_layout_node))
+        if (is<Layout::TextNode>(*first_layout_node))
             break;
     }
 
-    const LayoutNode* last_layout_node = first_layout_node;
+    const Layout::Node* last_layout_node = first_layout_node;
 
-    for (const LayoutNode* layout_node = first_layout_node; layout_node; layout_node = layout_node->next_in_pre_order()) {
-        if (is<LayoutText>(*layout_node))
+    for (const Layout::Node* layout_node = first_layout_node; layout_node; layout_node = layout_node->next_in_pre_order()) {
+        if (is<Layout::TextNode>(*layout_node))
             last_layout_node = layout_node;
     }
 
@@ -111,8 +111,8 @@ void InProcessWebView::select_all()
     ASSERT(last_layout_node);
 
     int last_layout_node_index_in_node = 0;
-    if (is<LayoutText>(*last_layout_node))
-        last_layout_node_index_in_node = downcast<LayoutText>(*last_layout_node).text_for_rendering().length() - 1;
+    if (is<Layout::TextNode>(*last_layout_node))
+        last_layout_node_index_in_node = downcast<Layout::TextNode>(*last_layout_node).text_for_rendering().length() - 1;
 
     layout_root->set_selection({ { first_layout_node, 0 }, { last_layout_node, last_layout_node_index_in_node } });
     update();
@@ -369,16 +369,16 @@ bool InProcessWebView::load(const URL& url)
     return page().main_frame().loader().load(url, FrameLoader::Type::Navigation);
 }
 
-const LayoutDocument* InProcessWebView::layout_root() const
+const Layout::InitialContainingBlockBox* InProcessWebView::layout_root() const
 {
     return document() ? document()->layout_node() : nullptr;
 }
 
-LayoutDocument* InProcessWebView::layout_root()
+Layout::InitialContainingBlockBox* InProcessWebView::layout_root()
 {
     if (!document())
         return nullptr;
-    return const_cast<LayoutDocument*>(document()->layout_node());
+    return const_cast<Layout::InitialContainingBlockBox*>(document()->layout_node());
 }
 
 void InProcessWebView::page_did_request_scroll_into_view(const Gfx::IntRect& rect)
diff --git a/Libraries/LibWeb/InProcessWebView.h b/Libraries/LibWeb/InProcessWebView.h
index e84778a2a5..7194836b9d 100644
--- a/Libraries/LibWeb/InProcessWebView.h
+++ b/Libraries/LibWeb/InProcessWebView.h
@@ -51,8 +51,8 @@ public:
 
     void set_document(DOM::Document*);
 
-    const LayoutDocument* layout_root() const;
-    LayoutDocument* layout_root();
+    const Layout::InitialContainingBlockBox* layout_root() const;
+    Layout::InitialContainingBlockBox* layout_root();
 
     void reload();
     bool load(const URL&);
diff --git a/Libraries/LibWeb/Layout/LayoutBlock.cpp b/Libraries/LibWeb/Layout/BlockBox.cpp
index b3b85ed931..54799bcbb4 100644
--- a/Libraries/LibWeb/Layout/LayoutBlock.cpp
+++ b/Libraries/LibWeb/Layout/BlockBox.cpp
@@ -28,40 +28,40 @@
 #include <LibWeb/CSS/StyleResolver.h>
 #include <LibWeb/DOM/Element.h>
 #include <LibWeb/Dump.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutInline.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
-#include <LibWeb/Layout/LayoutText.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/InlineNode.h>
+#include <LibWeb/Layout/ReplacedBox.h>
+#include <LibWeb/Layout/TextNode.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <math.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutBlock::LayoutBlock(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBox(document, node, move(style))
+BlockBox::BlockBox(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
+    : Box(document, node, move(style))
 {
 }
 
-LayoutBlock::~LayoutBlock()
+BlockBox::~BlockBox()
 {
 }
 
-LayoutNode& LayoutBlock::inline_wrapper()
+Node& BlockBox::inline_wrapper()
 {
     if (!last_child() || !last_child()->is_block() || last_child()->dom_node() != nullptr) {
-        append_child(adopt(*new LayoutBlock(document(), nullptr, style_for_anonymous_block())));
+        append_child(adopt(*new BlockBox(document(), nullptr, style_for_anonymous_block())));
         last_child()->set_children_are_inline(true);
     }
     return *last_child();
 }
 
-void LayoutBlock::paint(PaintContext& context, PaintPhase phase)
+void BlockBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
 
-    LayoutBox::paint(context, phase);
+    Box::paint(context, phase);
 
     // FIXME: Inline backgrounds etc.
     if (phase == PaintPhase::Foreground) {
@@ -94,19 +94,19 @@ void LayoutBlock::paint(PaintContext& context, PaintPhase phase)
     }
 }
 
-HitTestResult LayoutBlock::hit_test(const Gfx::IntPoint& position, HitTestType type) const
+HitTestResult BlockBox::hit_test(const Gfx::IntPoint& position, HitTestType type) const
 {
     if (!children_are_inline())
-        return LayoutBox::hit_test(position, type);
+        return Box::hit_test(position, type);
 
     HitTestResult last_good_candidate;
     for (auto& line_box : m_line_boxes) {
         for (auto& fragment : line_box.fragments()) {
-            if (is<LayoutBox>(fragment.layout_node()) && downcast<LayoutBox>(fragment.layout_node()).stacking_context())
+            if (is<Box>(fragment.layout_node()) && downcast<Box>(fragment.layout_node()).stacking_context())
                 continue;
             if (enclosing_int_rect(fragment.absolute_rect()).contains(position)) {
                 if (fragment.layout_node().is_block())
-                    return downcast<LayoutBlock>(fragment.layout_node()).hit_test(position, type);
+                    return downcast<BlockBox>(fragment.layout_node()).hit_test(position, type);
                 return { fragment.layout_node(), fragment.text_index_at(position.x()) };
             }
             if (fragment.absolute_rect().top() <= position.y())
@@ -119,7 +119,7 @@ HitTestResult LayoutBlock::hit_test(const Gfx::IntPoint& position, HitTestType t
     return { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
 }
 
-NonnullRefPtr<CSS::StyleProperties> LayoutBlock::style_for_anonymous_block() const
+NonnullRefPtr<CSS::StyleProperties> BlockBox::style_for_anonymous_block() const
 {
     auto new_style = CSS::StyleProperties::create();
 
@@ -131,7 +131,7 @@ NonnullRefPtr<CSS::StyleProperties> LayoutBlock::style_for_anonymous_block() con
     return new_style;
 }
 
-void LayoutBlock::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
+void BlockBox::split_into_lines(BlockBox& container, LayoutMode layout_mode)
 {
     auto* line_box = &container.ensure_last_line_box();
     if (layout_mode != LayoutMode::OnlyRequiredLineBreaks && line_box->width() > 0 && line_box->width() + width() > container.width()) {
diff --git a/Libraries/LibWeb/Layout/LayoutBlock.h b/Libraries/LibWeb/Layout/BlockBox.h
index 7e5c4341c2..4234dcd39a 100644
--- a/Libraries/LibWeb/Layout/LayoutBlock.h
+++ b/Libraries/LibWeb/Layout/BlockBox.h
@@ -26,35 +26,35 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Layout/LineBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutBlock : public LayoutBox {
+class BlockBox : public Box {
 public:
-    LayoutBlock(DOM::Document&, DOM::Node*, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutBlock() override;
+    BlockBox(DOM::Document&, DOM::Node*, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~BlockBox() override;
 
-    virtual const char* class_name() const override { return "LayoutBlock"; }
+    virtual const char* class_name() const override { return "BlockBox"; }
 
     virtual void paint(PaintContext&, PaintPhase) override;
 
-    virtual LayoutNode& inline_wrapper() override;
+    virtual Node& inline_wrapper() override;
 
     virtual HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const override;
 
-    LayoutBlock* previous_sibling() { return downcast<LayoutBlock>(LayoutNode::previous_sibling()); }
-    const LayoutBlock* previous_sibling() const { return downcast<LayoutBlock>(LayoutNode::previous_sibling()); }
-    LayoutBlock* next_sibling() { return downcast<LayoutBlock>(LayoutNode::next_sibling()); }
-    const LayoutBlock* next_sibling() const { return downcast<LayoutBlock>(LayoutNode::next_sibling()); }
+    BlockBox* previous_sibling() { return downcast<BlockBox>(Node::previous_sibling()); }
+    const BlockBox* previous_sibling() const { return downcast<BlockBox>(Node::previous_sibling()); }
+    BlockBox* next_sibling() { return downcast<BlockBox>(Node::next_sibling()); }
+    const BlockBox* next_sibling() const { return downcast<BlockBox>(Node::next_sibling()); }
 
     template<typename Callback>
     void for_each_fragment(Callback);
     template<typename Callback>
     void for_each_fragment(Callback) const;
 
-    virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
+    virtual void split_into_lines(BlockBox& container, LayoutMode) override;
 
 private:
     virtual bool is_block() const override { return true; }
@@ -63,7 +63,7 @@ private:
 };
 
 template<typename Callback>
-void LayoutBlock::for_each_fragment(Callback callback)
+void BlockBox::for_each_fragment(Callback callback)
 {
     for (auto& line_box : line_boxes()) {
         for (auto& fragment : line_box.fragments()) {
@@ -74,7 +74,7 @@ void LayoutBlock::for_each_fragment(Callback callback)
 }
 
 template<typename Callback>
-void LayoutBlock::for_each_fragment(Callback callback) const
+void BlockBox::for_each_fragment(Callback callback) const
 {
     for (auto& line_box : line_boxes()) {
         for (auto& fragment : line_box.fragments()) {
@@ -86,6 +86,6 @@ void LayoutBlock::for_each_fragment(Callback callback) const
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutBlock)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_block(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::BlockBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_block(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/BlockFormattingContext.cpp b/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
index 3c22fc1d52..5f1483e043 100644
--- a/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
+++ b/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
@@ -26,18 +26,18 @@
 
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/DOM/Node.h>
+#include <LibWeb/Layout/BlockBox.h>
 #include <LibWeb/Layout/BlockFormattingContext.h>
+#include <LibWeb/Layout/Box.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/InlineFormattingContext.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutBox.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutListItem.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/ListItemBox.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <LibWeb/Page/Frame.h>
 
 namespace Web::Layout {
 
-BlockFormattingContext::BlockFormattingContext(LayoutBox& context_box)
+BlockFormattingContext::BlockFormattingContext(Box& context_box)
     : FormattingContext(context_box)
 {
 }
@@ -79,11 +79,11 @@ void BlockFormattingContext::run(LayoutMode layout_mode)
         layout_absolutely_positioned_descendants();
 }
 
-void BlockFormattingContext::compute_width(LayoutBox& box)
+void BlockFormattingContext::compute_width(Box& box)
 {
     if (box.is_replaced()) {
-        // FIXME: This should not be done *by* LayoutReplaced
-        auto& replaced = downcast<LayoutReplaced>(box);
+        // FIXME: This should not be done *by* ReplacedBox
+        auto& replaced = downcast<ReplacedBox>(box);
         replaced.prepare_for_replaced_layout();
         auto width = replaced.calculate_width();
         replaced.set_width(width);
@@ -214,7 +214,7 @@ void BlockFormattingContext::compute_width(LayoutBox& box)
     box.box_model().padding.right = padding_right;
 }
 
-void BlockFormattingContext::compute_width_for_absolutely_positioned_block(LayoutBox& box)
+void BlockFormattingContext::compute_width_for_absolutely_positioned_block(Box& box)
 {
     auto& containing_block = context_box();
     auto& style = box.style();
@@ -354,11 +354,11 @@ void BlockFormattingContext::compute_width_for_absolutely_positioned_block(Layou
     box.box_model().padding.right = padding_right;
 }
 
-void BlockFormattingContext::compute_height(LayoutBox& box)
+void BlockFormattingContext::compute_height(Box& box)
 {
     if (box.is_replaced()) {
-        // FIXME: This should not be done *by* LayoutReplaced
-        auto height = downcast<LayoutReplaced>(box).calculate_height();
+        // FIXME: This should not be done *by* ReplacedBox
+        auto height = downcast<ReplacedBox>(box).calculate_height();
         box.set_height(height);
         return;
     }
@@ -402,7 +402,7 @@ void BlockFormattingContext::layout_block_level_children(LayoutMode layout_mode)
     float content_height = 0;
     float content_width = 0;
 
-    context_box().for_each_in_subtree_of_type<LayoutBox>([&](auto& box) {
+    context_box().for_each_in_subtree_of_type<Box>([&](auto& box) {
         if (box.is_absolutely_positioned() || box.containing_block() != &context_box())
             return IterationDecision::Continue;
 
@@ -415,15 +415,15 @@ void BlockFormattingContext::layout_block_level_children(LayoutMode layout_mode)
         else if (box.is_block())
             place_block_level_non_replaced_element_in_normal_flow(box);
         else
-            dbgln("FIXME: LayoutBlock::layout_contained_boxes doesn't know how to place a {}", box.class_name());
+            dbgln("FIXME: Layout::BlockBox::layout_contained_boxes doesn't know how to place a {}", box.class_name());
 
         // FIXME: This should be factored differently. It's uncool that we mutate the tree *during* layout!
         //        Instead, we should generate the marker box during the tree build.
-        if (is<LayoutListItem>(box))
-            downcast<LayoutListItem>(box).layout_marker();
+        if (is<ListItemBox>(box))
+            downcast<ListItemBox>(box).layout_marker();
 
         content_height = max(content_height, box.effective_offset().y() + box.height() + box.box_model().margin_box(box).bottom);
-        content_width = max(content_width, downcast<LayoutBox>(box).width());
+        content_width = max(content_width, downcast<Box>(box).width());
         return IterationDecision::Continue;
     });
 
@@ -436,7 +436,7 @@ void BlockFormattingContext::layout_block_level_children(LayoutMode layout_mode)
     context_box().set_height(content_height);
 }
 
-void BlockFormattingContext::place_block_level_replaced_element_in_normal_flow(LayoutBox& box)
+void BlockFormattingContext::place_block_level_replaced_element_in_normal_flow(Box& box)
 {
     auto& containing_block = context_box();
     ASSERT(!containing_block.is_absolutely_positioned());
@@ -459,7 +459,7 @@ void BlockFormattingContext::place_block_level_replaced_element_in_normal_flow(L
     box.set_offset(x, y);
 }
 
-void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_flow(LayoutBox& box)
+void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_flow(Box& box)
 {
     auto zero_value = CSS::Length::make_px(0);
     auto& containing_block = context_box();
@@ -488,7 +488,7 @@ void BlockFormattingContext::place_block_level_non_replaced_element_in_normal_fl
     // NOTE: Empty (0-height) preceding siblings have their margins collapsed with *their* preceding sibling, etc.
     float collapsed_bottom_margin_of_preceding_siblings = 0;
 
-    auto* relevant_sibling = box.previous_sibling_of_type<LayoutBlock>();
+    auto* relevant_sibling = box.previous_sibling_of_type<Layout::BlockBox>();
     while (relevant_sibling != nullptr) {
         if (!relevant_sibling->is_absolutely_positioned() && !relevant_sibling->is_floating()) {
             collapsed_bottom_margin_of_preceding_siblings = max(collapsed_bottom_margin_of_preceding_siblings, relevant_sibling->box_model().margin.bottom.to_px(*relevant_sibling));
@@ -523,7 +523,7 @@ void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_m
 {
     auto viewport_rect = context_box().frame().viewport_rect();
 
-    auto& icb = downcast<LayoutDocument>(context_box());
+    auto& icb = downcast<Layout::InitialContainingBlockBox>(context_box());
     icb.build_stacking_context_tree();
 
     icb.set_width(viewport_rect.width());
@@ -535,7 +535,7 @@ void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_m
     // FIXME: The ICB should have the height of the viewport.
     //        Instead of auto-sizing the ICB, we should spill into overflow.
     float lowest_bottom = 0;
-    icb.for_each_child_of_type<LayoutBox>([&](auto& child) {
+    icb.for_each_child_of_type<Box>([&](auto& child) {
         lowest_bottom = max(lowest_bottom, child.absolute_rect().bottom());
     });
     icb.set_height(lowest_bottom);
@@ -546,7 +546,7 @@ void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_m
 
     // FIXME: This is a total hack. Make sure any GUI::Widgets are moved into place after layout.
     //        We should stop embedding GUI::Widgets entirely, since that won't work out-of-process.
-    icb.for_each_in_subtree_of_type<LayoutWidget>([&](auto& widget) {
+    icb.for_each_in_subtree_of_type<Layout::WidgetBox>([&](auto& widget) {
         widget.update_widget();
         return IterationDecision::Continue;
     });
@@ -554,7 +554,7 @@ void BlockFormattingContext::layout_initial_containing_block(LayoutMode layout_m
 
 void BlockFormattingContext::layout_absolutely_positioned_descendants()
 {
-    context_box().for_each_in_subtree_of_type<LayoutBox>([&](auto& box) {
+    context_box().for_each_in_subtree_of_type<Box>([&](auto& box) {
         if (box.is_absolutely_positioned() && box.containing_block() == &context_box()) {
             layout_absolutely_positioned_descendant(box);
         }
@@ -562,7 +562,7 @@ void BlockFormattingContext::layout_absolutely_positioned_descendants()
     });
 }
 
-void BlockFormattingContext::layout_absolutely_positioned_descendant(LayoutBox& box)
+void BlockFormattingContext::layout_absolutely_positioned_descendant(Box& box)
 {
     auto& containing_block = context_box();
     auto& box_model = box.box_model();
diff --git a/Libraries/LibWeb/Layout/BlockFormattingContext.h b/Libraries/LibWeb/Layout/BlockFormattingContext.h
index 88b2773ecd..6b58129899 100644
--- a/Libraries/LibWeb/Layout/BlockFormattingContext.h
+++ b/Libraries/LibWeb/Layout/BlockFormattingContext.h
@@ -33,7 +33,7 @@ namespace Web::Layout {
 
 class BlockFormattingContext : public FormattingContext {
 public:
-    explicit BlockFormattingContext(LayoutBox& containing_block);
+    explicit BlockFormattingContext(Box& containing_block);
     ~BlockFormattingContext();
 
     virtual void run(LayoutMode) override;
@@ -41,21 +41,21 @@ public:
     bool is_initial() const;
 
 protected:
-    void compute_width(LayoutBox&);
-    void compute_height(LayoutBox&);
+    void compute_width(Box&);
+    void compute_height(Box&);
 
 private:
-    void compute_width_for_absolutely_positioned_block(LayoutBox&);
+    void compute_width_for_absolutely_positioned_block(Box&);
 
     void layout_initial_containing_block(LayoutMode);
     void layout_block_level_children(LayoutMode);
     void layout_inline_children(LayoutMode);
     void layout_absolutely_positioned_descendants();
 
-    void place_block_level_replaced_element_in_normal_flow(LayoutBox&);
-    void place_block_level_non_replaced_element_in_normal_flow(LayoutBox&);
+    void place_block_level_replaced_element_in_normal_flow(Box&);
+    void place_block_level_non_replaced_element_in_normal_flow(Box&);
 
-    void layout_absolutely_positioned_descendant(LayoutBox&);
+    void layout_absolutely_positioned_descendant(Box&);
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutBox.cpp b/Libraries/LibWeb/Layout/Box.cpp
index 2935363896..09d3ea4bbe 100644
--- a/Libraries/LibWeb/Layout/LayoutBox.cpp
+++ b/Libraries/LibWeb/Layout/Box.cpp
@@ -27,13 +27,13 @@
 #include <LibGUI/Painter.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLBodyElement.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Page/Frame.h>
 
-namespace Web {
+namespace Web::Layout {
 
-void LayoutBox::paint_border(PaintContext& context, Edge edge, const Gfx::FloatRect& rect, CSS::PropertyID style_property_id, const BorderData& border_data)
+void Box::paint_border(PaintContext& context, Edge edge, const Gfx::FloatRect& rect, CSS::PropertyID style_property_id, const BorderData& border_data)
 {
     float width = border_data.width;
     if (width <= 0)
@@ -162,7 +162,7 @@ void LayoutBox::paint_border(PaintContext& context, Edge edge, const Gfx::FloatR
     }
 }
 
-void LayoutBox::paint(PaintContext& context, PaintPhase phase)
+void Box::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
@@ -206,7 +206,7 @@ void LayoutBox::paint(PaintContext& context, PaintPhase phase)
         paint_border(context, Edge::Bottom, bordered_rect, CSS::PropertyID::BorderBottomStyle, style().border_bottom());
     }
 
-    LayoutNodeWithStyleAndBoxModelMetrics::paint(context, phase);
+    Layout::NodeWithStyleAndBoxModelMetrics::paint(context, phase);
 
     if (phase == PaintPhase::Overlay && dom_node() && document().inspected_node() == dom_node()) {
         auto content_rect = absolute_rect();
@@ -228,14 +228,14 @@ void LayoutBox::paint(PaintContext& context, PaintPhase phase)
     }
 }
 
-HitTestResult LayoutBox::hit_test(const Gfx::IntPoint& position, HitTestType type) const
+HitTestResult Box::hit_test(const Gfx::IntPoint& position, HitTestType type) const
 {
     // FIXME: It would be nice if we could confidently skip over hit testing
     //        parts of the layout tree, but currently we can't just check
     //        m_rect.contains() since inline text rects can't be trusted..
     HitTestResult result { absolute_rect().contains(position.x(), position.y()) ? this : nullptr };
     for_each_child([&](auto& child) {
-        if (is<LayoutBox>(child) && downcast<LayoutBox>(child).stacking_context())
+        if (is<Box>(child) && downcast<Box>(child).stacking_context())
             return;
         auto child_result = child.hit_test(position, type);
         if (child_result.layout_node)
@@ -244,22 +244,22 @@ HitTestResult LayoutBox::hit_test(const Gfx::IntPoint& position, HitTestType typ
     return result;
 }
 
-void LayoutBox::set_needs_display()
+void Box::set_needs_display()
 {
     if (!is_inline()) {
         frame().set_needs_display(enclosing_int_rect(absolute_rect()));
         return;
     }
 
-    LayoutNode::set_needs_display();
+    Node::set_needs_display();
 }
 
-bool LayoutBox::is_body() const
+bool Box::is_body() const
 {
     return dom_node() && dom_node() == document().body();
 }
 
-void LayoutBox::set_offset(const Gfx::FloatPoint& offset)
+void Box::set_offset(const Gfx::FloatPoint& offset)
 {
     if (m_offset == offset)
         return;
@@ -267,7 +267,7 @@ void LayoutBox::set_offset(const Gfx::FloatPoint& offset)
     did_set_rect();
 }
 
-void LayoutBox::set_size(const Gfx::FloatSize& size)
+void Box::set_size(const Gfx::FloatSize& size)
 {
     if (m_size == size)
         return;
@@ -275,14 +275,14 @@ void LayoutBox::set_size(const Gfx::FloatSize& size)
     did_set_rect();
 }
 
-Gfx::FloatPoint LayoutBox::effective_offset() const
+Gfx::FloatPoint Box::effective_offset() const
 {
     if (m_containing_line_box_fragment)
         return m_containing_line_box_fragment->offset();
     return m_offset;
 }
 
-const Gfx::FloatRect LayoutBox::absolute_rect() const
+const Gfx::FloatRect Box::absolute_rect() const
 {
     Gfx::FloatRect rect { effective_offset(), size() };
     for (auto* block = containing_block(); block; block = block->containing_block()) {
@@ -291,27 +291,27 @@ const Gfx::FloatRect LayoutBox::absolute_rect() const
     return rect;
 }
 
-void LayoutBox::set_containing_line_box_fragment(LineBoxFragment& fragment)
+void Box::set_containing_line_box_fragment(LineBoxFragment& fragment)
 {
     m_containing_line_box_fragment = fragment.make_weak_ptr();
 }
 
-StackingContext* LayoutBox::enclosing_stacking_context()
+StackingContext* Box::enclosing_stacking_context()
 {
     for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
         if (!ancestor->is_box())
             continue;
-        auto& ancestor_box = downcast<LayoutBox>(*ancestor);
+        auto& ancestor_box = downcast<Box>(*ancestor);
         if (!ancestor_box.establishes_stacking_context())
             continue;
         ASSERT(ancestor_box.stacking_context());
         return ancestor_box.stacking_context();
     }
-    // We should always reach the LayoutDocument stacking context.
+    // We should always reach the Layout::InitialContainingBlockBox stacking context.
     ASSERT_NOT_REACHED();
 }
 
-bool LayoutBox::establishes_stacking_context() const
+bool Box::establishes_stacking_context() const
 {
     if (!has_style())
         return false;
@@ -328,20 +328,20 @@ bool LayoutBox::establishes_stacking_context() const
     return false;
 }
 
-LineBox& LayoutBox::ensure_last_line_box()
+LineBox& Box::ensure_last_line_box()
 {
     if (m_line_boxes.is_empty())
         return add_line_box();
     return m_line_boxes.last();
 }
 
-LineBox& LayoutBox::add_line_box()
+LineBox& Box::add_line_box()
 {
     m_line_boxes.append(LineBox());
     return m_line_boxes.last();
 }
 
-float LayoutBox::width_of_logical_containing_block() const
+float Box::width_of_logical_containing_block() const
 {
     auto* containing_block = this->containing_block();
     ASSERT(containing_block);
diff --git a/Libraries/LibWeb/Layout/LayoutBox.h b/Libraries/LibWeb/Layout/Box.h
index f5e971e6b0..0354938e05 100644
--- a/Libraries/LibWeb/Layout/LayoutBox.h
+++ b/Libraries/LibWeb/Layout/Box.h
@@ -28,13 +28,13 @@
 
 #include <AK/OwnPtr.h>
 #include <LibGfx/Rect.h>
-#include <LibWeb/Layout/LayoutNode.h>
 #include <LibWeb/Layout/LineBox.h>
+#include <LibWeb/Layout/Node.h>
 #include <LibWeb/Painting/StackingContext.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutBox : public LayoutNodeWithStyleAndBoxModelMetrics {
+class Box : public NodeWithStyleAndBoxModelMetrics {
 public:
     const Gfx::FloatRect absolute_rect() const;
 
@@ -80,8 +80,8 @@ public:
     virtual float width_of_logical_containing_block() const;
 
 protected:
-    LayoutBox(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
-        : LayoutNodeWithStyleAndBoxModelMetrics(document, node, move(style))
+    Box(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
+        : NodeWithStyleAndBoxModelMetrics(document, node, move(style))
     {
     }
 
@@ -111,6 +111,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutBox)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_box(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::Box)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_box(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/BoxModelMetrics.cpp b/Libraries/LibWeb/Layout/BoxModelMetrics.cpp
index 1cd0ac430d..0a1702d93c 100644
--- a/Libraries/LibWeb/Layout/BoxModelMetrics.cpp
+++ b/Libraries/LibWeb/Layout/BoxModelMetrics.cpp
@@ -26,9 +26,9 @@
 
 #include <LibWeb/Layout/BoxModelMetrics.h>
 
-namespace Web {
+namespace Web::Layout {
 
-PixelBox BoxModelMetrics::margin_box(const LayoutNode& layout_node) const
+PixelBox BoxModelMetrics::margin_box(const Node& layout_node) const
 {
     return {
         margin.top.to_px(layout_node) + border.top.to_px(layout_node) + padding.top.to_px(layout_node),
@@ -38,7 +38,7 @@ PixelBox BoxModelMetrics::margin_box(const LayoutNode& layout_node) const
     };
 }
 
-PixelBox BoxModelMetrics::padding_box(const LayoutNode& layout_node) const
+PixelBox BoxModelMetrics::padding_box(const Node& layout_node) const
 {
     return {
         padding.top.to_px(layout_node),
@@ -48,7 +48,7 @@ PixelBox BoxModelMetrics::padding_box(const LayoutNode& layout_node) const
     };
 }
 
-PixelBox BoxModelMetrics::border_box(const LayoutNode& layout_node) const
+PixelBox BoxModelMetrics::border_box(const Node& layout_node) const
 {
     return {
         border.top.to_px(layout_node) + padding.top.to_px(layout_node),
diff --git a/Libraries/LibWeb/Layout/BoxModelMetrics.h b/Libraries/LibWeb/Layout/BoxModelMetrics.h
index 5e56433436..f5b5bed30c 100644
--- a/Libraries/LibWeb/Layout/BoxModelMetrics.h
+++ b/Libraries/LibWeb/Layout/BoxModelMetrics.h
@@ -29,7 +29,7 @@
 #include <LibGfx/Size.h>
 #include <LibWeb/CSS/LengthBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
 struct PixelBox {
     float top;
@@ -45,9 +45,9 @@ public:
     CSS::LengthBox border;
     CSS::LengthBox offset;
 
-    PixelBox margin_box(const LayoutNode&) const;
-    PixelBox padding_box(const LayoutNode&) const;
-    PixelBox border_box(const LayoutNode&) const;
+    PixelBox margin_box(const Node&) const;
+    PixelBox padding_box(const Node&) const;
+    PixelBox border_box(const Node&) const;
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutBreak.cpp b/Libraries/LibWeb/Layout/BreakNode.cpp
index 5fd401892f..0a230a9873 100644
--- a/Libraries/LibWeb/Layout/LayoutBreak.cpp
+++ b/Libraries/LibWeb/Layout/BreakNode.cpp
@@ -24,22 +24,22 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutBreak.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/BreakNode.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutBreak::LayoutBreak(DOM::Document& document, HTML::HTMLBRElement& element)
-    : LayoutNodeWithStyleAndBoxModelMetrics(document, &element, CSS::StyleProperties::create())
+BreakNode::BreakNode(DOM::Document& document, HTML::HTMLBRElement& element)
+    : Layout::NodeWithStyleAndBoxModelMetrics(document, &element, CSS::StyleProperties::create())
 {
     set_inline(true);
 }
 
-LayoutBreak::~LayoutBreak()
+BreakNode::~BreakNode()
 {
 }
 
-void LayoutBreak::split_into_lines(LayoutBlock& block, LayoutMode)
+void BreakNode::split_into_lines(BlockBox& block, LayoutMode)
 {
     block.add_line_box();
 }
diff --git a/Libraries/LibWeb/Layout/LayoutBreak.h b/Libraries/LibWeb/Layout/BreakNode.h
index 076c675109..07ecb6926f 100644
--- a/Libraries/LibWeb/Layout/LayoutBreak.h
+++ b/Libraries/LibWeb/Layout/BreakNode.h
@@ -27,25 +27,25 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLBRElement.h>
-#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Layout/Node.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutBreak final : public LayoutNodeWithStyleAndBoxModelMetrics {
+class BreakNode final : public NodeWithStyleAndBoxModelMetrics {
 public:
-    LayoutBreak(DOM::Document&, HTML::HTMLBRElement&);
-    virtual ~LayoutBreak() override;
+    BreakNode(DOM::Document&, HTML::HTMLBRElement&);
+    virtual ~BreakNode() override;
 
-    const HTML::HTMLBRElement& dom_node() const { return downcast<HTML::HTMLBRElement>(*LayoutNode::dom_node()); }
+    const HTML::HTMLBRElement& dom_node() const { return downcast<HTML::HTMLBRElement>(*Node::dom_node()); }
 
 private:
     virtual bool is_break() const override { return true; }
-    virtual const char* class_name() const override { return "LayoutBreak"; }
-    virtual void split_into_lines(LayoutBlock&, LayoutMode) override;
+    virtual const char* class_name() const override { return "BreakNode"; }
+    virtual void split_into_lines(BlockBox&, LayoutMode) override;
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutBreak)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_break(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::BreakNode)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_break(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutButton.cpp b/Libraries/LibWeb/Layout/ButtonBox.cpp
index d7533e63d6..4ceaa87e8d 100644
--- a/Libraries/LibWeb/Layout/LayoutButton.cpp
+++ b/Libraries/LibWeb/Layout/ButtonBox.cpp
@@ -29,21 +29,21 @@
 #include <LibGfx/Font.h>
 #include <LibGfx/StylePainter.h>
 #include <LibWeb/DOM/Document.h>
-#include <LibWeb/Layout/LayoutButton.h>
+#include <LibWeb/Layout/ButtonBox.h>
 #include <LibWeb/Page/Frame.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutButton::LayoutButton(DOM::Document& document, HTML::HTMLInputElement& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutReplaced(document, element, move(style))
+ButtonBox::ButtonBox(DOM::Document& document, HTML::HTMLInputElement& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : ReplacedBox(document, element, move(style))
 {
 }
 
-LayoutButton::~LayoutButton()
+ButtonBox::~ButtonBox()
 {
 }
 
-void LayoutButton::prepare_for_replaced_layout()
+void ButtonBox::prepare_for_replaced_layout()
 {
     auto& font = specified_style().font();
     set_intrinsic_width(font.width(dom_node().value()) + 20);
@@ -53,12 +53,12 @@ void LayoutButton::prepare_for_replaced_layout()
     set_has_intrinsic_height(true);
 }
 
-void LayoutButton::paint(PaintContext& context, PaintPhase phase)
+void ButtonBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
 
-    LayoutReplaced::paint(context, phase);
+    ReplacedBox::paint(context, phase);
 
     if (phase == PaintPhase::Foreground) {
         bool hovered = document().hovered_node() == &dom_node();
@@ -71,7 +71,7 @@ void LayoutButton::paint(PaintContext& context, PaintPhase phase)
     }
 }
 
-void LayoutButton::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned)
+void ButtonBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned)
 {
     if (button != GUI::MouseButton::Left || !dom_node().enabled())
         return;
@@ -83,7 +83,7 @@ void LayoutButton::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, u
     frame().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
-void LayoutButton::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
+void ButtonBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
 {
     if (!m_tracking_mouse || button != GUI::MouseButton::Left || !dom_node().enabled())
         return;
@@ -102,7 +102,7 @@ void LayoutButton::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& posi
     protected_frame->event_handler().set_mouse_event_tracking_layout_node(nullptr);
 }
 
-void LayoutButton::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
+void ButtonBox::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
 {
     if (!m_tracking_mouse || !dom_node().enabled())
         return;
diff --git a/Libraries/LibWeb/Layout/LayoutButton.h b/Libraries/LibWeb/Layout/ButtonBox.h
index 5d6fa36b74..35cc336fc4 100644
--- a/Libraries/LibWeb/Layout/LayoutButton.h
+++ b/Libraries/LibWeb/Layout/ButtonBox.h
@@ -27,23 +27,23 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLInputElement.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutButton : public LayoutReplaced {
+class ButtonBox : public ReplacedBox {
 public:
-    LayoutButton(DOM::Document&, HTML::HTMLInputElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutButton() override;
+    ButtonBox(DOM::Document&, HTML::HTMLInputElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~ButtonBox() override;
 
     virtual void prepare_for_replaced_layout() override;
     virtual void paint(PaintContext&, PaintPhase) override;
 
-    const HTML::HTMLInputElement& dom_node() const { return static_cast<const HTML::HTMLInputElement&>(LayoutReplaced::dom_node()); }
-    HTML::HTMLInputElement& dom_node() { return static_cast<HTML::HTMLInputElement&>(LayoutReplaced::dom_node()); }
+    const HTML::HTMLInputElement& dom_node() const { return static_cast<const HTML::HTMLInputElement&>(ReplacedBox::dom_node()); }
+    HTML::HTMLInputElement& dom_node() { return static_cast<HTML::HTMLInputElement&>(ReplacedBox::dom_node()); }
 
 private:
-    virtual const char* class_name() const override { return "LayoutButton"; }
+    virtual const char* class_name() const override { return "ButtonBox"; }
     virtual bool is_button() const override { return true; }
     virtual bool wants_mouse_events() const override { return true; }
     virtual void handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned modifiers) override;
@@ -56,6 +56,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutButton)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_button(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::ButtonBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_button(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutCanvas.cpp b/Libraries/LibWeb/Layout/CanvasBox.cpp
index 9a5cca4c82..c1eb048ace 100644
--- a/Libraries/LibWeb/Layout/LayoutCanvas.cpp
+++ b/Libraries/LibWeb/Layout/CanvasBox.cpp
@@ -27,20 +27,20 @@
 #include <LibGUI/Painter.h>
 #include <LibGfx/Font.h>
 #include <LibGfx/StylePainter.h>
-#include <LibWeb/Layout/LayoutCanvas.h>
+#include <LibWeb/Layout/CanvasBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutCanvas::LayoutCanvas(DOM::Document& document, HTML::HTMLCanvasElement& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutReplaced(document, element, move(style))
+CanvasBox::CanvasBox(DOM::Document& document, HTML::HTMLCanvasElement& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : ReplacedBox(document, element, move(style))
 {
 }
 
-LayoutCanvas::~LayoutCanvas()
+CanvasBox::~CanvasBox()
 {
 }
 
-void LayoutCanvas::prepare_for_replaced_layout()
+void CanvasBox::prepare_for_replaced_layout()
 {
     set_has_intrinsic_width(true);
     set_has_intrinsic_height(true);
@@ -48,12 +48,12 @@ void LayoutCanvas::prepare_for_replaced_layout()
     set_intrinsic_height(dom_node().height());
 }
 
-void LayoutCanvas::paint(PaintContext& context, PaintPhase phase)
+void CanvasBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
 
-    LayoutReplaced::paint(context, phase);
+    ReplacedBox::paint(context, phase);
 
     if (phase == PaintPhase::Foreground) {
         // FIXME: This should be done at a different level. Also rect() does not include padding etc!
diff --git a/Libraries/LibWeb/Layout/LayoutCanvas.h b/Libraries/LibWeb/Layout/CanvasBox.h
index 7f2d8220c2..16c1110724 100644
--- a/Libraries/LibWeb/Layout/LayoutCanvas.h
+++ b/Libraries/LibWeb/Layout/CanvasBox.h
@@ -27,27 +27,27 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLCanvasElement.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutCanvas : public LayoutReplaced {
+class CanvasBox : public ReplacedBox {
 public:
-    LayoutCanvas(DOM::Document&, HTML::HTMLCanvasElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutCanvas() override;
+    CanvasBox(DOM::Document&, HTML::HTMLCanvasElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~CanvasBox() override;
 
     virtual void prepare_for_replaced_layout() override;
     virtual void paint(PaintContext&, PaintPhase) override;
 
-    const HTML::HTMLCanvasElement& dom_node() const { return static_cast<const HTML::HTMLCanvasElement&>(LayoutReplaced::dom_node()); }
+    const HTML::HTMLCanvasElement& dom_node() const { return static_cast<const HTML::HTMLCanvasElement&>(ReplacedBox::dom_node()); }
 
 private:
-    virtual const char* class_name() const override { return "LayoutCanvas"; }
+    virtual const char* class_name() const override { return "CanvasBox"; }
     virtual bool is_canvas() const override { return true; }
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutCanvas)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_canvas(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::CanvasBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_canvas(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutCheckBox.cpp b/Libraries/LibWeb/Layout/CheckBox.cpp
index 6ba9f18585..a259e4f2d5 100644
--- a/Libraries/LibWeb/Layout/LayoutCheckBox.cpp
+++ b/Libraries/LibWeb/Layout/CheckBox.cpp
@@ -28,13 +28,13 @@
 #include <LibGUI/Painter.h>
 #include <LibGfx/Font.h>
 #include <LibGfx/StylePainter.h>
-#include <LibWeb/Layout/LayoutCheckBox.h>
+#include <LibWeb/Layout/CheckBox.h>
 #include <LibWeb/Page/Frame.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutCheckBox::LayoutCheckBox(DOM::Document& document, HTML::HTMLInputElement& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutReplaced(document, element, move(style))
+CheckBox::CheckBox(DOM::Document& document, HTML::HTMLInputElement& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : ReplacedBox(document, element, move(style))
 {
     set_has_intrinsic_width(true);
     set_has_intrinsic_height(true);
@@ -42,23 +42,23 @@ LayoutCheckBox::LayoutCheckBox(DOM::Document& document, HTML::HTMLInputElement&
     set_intrinsic_height(13);
 }
 
-LayoutCheckBox::~LayoutCheckBox()
+CheckBox::~CheckBox()
 {
 }
 
-void LayoutCheckBox::paint(PaintContext& context, PaintPhase phase)
+void CheckBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
 
-    LayoutReplaced::paint(context, phase);
+    ReplacedBox::paint(context, phase);
 
     if (phase == PaintPhase::Foreground) {
         Gfx::StylePainter::paint_check_box(context.painter(), enclosing_int_rect(absolute_rect()), context.palette(), dom_node().enabled(), dom_node().checked(), m_being_pressed);
     }
 }
 
-void LayoutCheckBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned)
+void CheckBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned)
 {
     if (button != GUI::MouseButton::Left || !dom_node().enabled())
         return;
@@ -70,7 +70,7 @@ void LayoutCheckBox::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&,
     frame().event_handler().set_mouse_event_tracking_layout_node(this);
 }
 
-void LayoutCheckBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
+void CheckBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned button, unsigned)
 {
     if (!m_tracking_mouse || button != GUI::MouseButton::Left || !dom_node().enabled())
         return;
@@ -87,7 +87,7 @@ void LayoutCheckBox::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint& po
     frame().event_handler().set_mouse_event_tracking_layout_node(nullptr);
 }
 
-void LayoutCheckBox::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
+void CheckBox::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint& position, unsigned, unsigned)
 {
     if (!m_tracking_mouse || !dom_node().enabled())
         return;
diff --git a/Libraries/LibWeb/Layout/LayoutCheckBox.h b/Libraries/LibWeb/Layout/CheckBox.h
index 1e4482a579..f078952a60 100644
--- a/Libraries/LibWeb/Layout/LayoutCheckBox.h
+++ b/Libraries/LibWeb/Layout/CheckBox.h
@@ -27,22 +27,22 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLInputElement.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutCheckBox : public LayoutReplaced {
+class CheckBox : public ReplacedBox {
 public:
-    LayoutCheckBox(DOM::Document&, HTML::HTMLInputElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutCheckBox() override;
+    CheckBox(DOM::Document&, HTML::HTMLInputElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~CheckBox() override;
 
     virtual void paint(PaintContext&, PaintPhase) override;
 
-    const HTML::HTMLInputElement& dom_node() const { return static_cast<const HTML::HTMLInputElement&>(LayoutReplaced::dom_node()); }
-    HTML::HTMLInputElement& dom_node() { return static_cast<HTML::HTMLInputElement&>(LayoutReplaced::dom_node()); }
+    const HTML::HTMLInputElement& dom_node() const { return static_cast<const HTML::HTMLInputElement&>(ReplacedBox::dom_node()); }
+    HTML::HTMLInputElement& dom_node() { return static_cast<HTML::HTMLInputElement&>(ReplacedBox::dom_node()); }
 
 private:
-    virtual const char* class_name() const override { return "LayoutCheckBox"; }
+    virtual const char* class_name() const override { return "CheckBox"; }
     virtual bool is_check_box() const override { return true; }
     virtual bool wants_mouse_events() const override { return true; }
     virtual void handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned button, unsigned modifiers) override;
@@ -55,6 +55,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutCheckBox)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_check_box(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::CheckBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_check_box(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/FormattingContext.cpp b/Libraries/LibWeb/Layout/FormattingContext.cpp
index 1b52502813..05059e90b7 100644
--- a/Libraries/LibWeb/Layout/FormattingContext.cpp
+++ b/Libraries/LibWeb/Layout/FormattingContext.cpp
@@ -25,14 +25,14 @@
  */
 
 #include <LibWeb/Layout/BlockFormattingContext.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Layout/FormattingContext.h>
 #include <LibWeb/Layout/InlineFormattingContext.h>
-#include <LibWeb/Layout/LayoutBox.h>
 #include <LibWeb/Layout/TableFormattingContext.h>
 
 namespace Web::Layout {
 
-FormattingContext::FormattingContext(LayoutBox& context_box)
+FormattingContext::FormattingContext(Box& context_box)
     : m_context_box(context_box)
 {
 }
@@ -41,7 +41,7 @@ FormattingContext::~FormattingContext()
 {
 }
 
-void FormattingContext::layout_inside(LayoutBox& box, LayoutMode layout_mode)
+void FormattingContext::layout_inside(Box& box, LayoutMode layout_mode)
 {
     if (box.is_table()) {
         TableFormattingContext context(box);
@@ -55,7 +55,7 @@ void FormattingContext::layout_inside(LayoutBox& box, LayoutMode layout_mode)
     }
 }
 
-static float greatest_child_width(const LayoutBox& box)
+static float greatest_child_width(const Box& box)
 {
     float max_width = 0;
     if (box.children_are_inline()) {
@@ -63,14 +63,14 @@ static float greatest_child_width(const LayoutBox& box)
             max_width = max(max_width, child.width());
         }
     } else {
-        box.for_each_child_of_type<LayoutBox>([&](auto& child) {
+        box.for_each_child_of_type<Box>([&](auto& child) {
             max_width = max(max_width, child.width());
         });
     }
     return max_width;
 }
 
-FormattingContext::ShrinkToFitResult FormattingContext::calculate_shrink_to_fit_widths(LayoutBox& box)
+FormattingContext::ShrinkToFitResult FormattingContext::calculate_shrink_to_fit_widths(Box& box)
 {
     // Calculate the preferred width by formatting the content without breaking lines
     // other than where explicit line breaks occur.
diff --git a/Libraries/LibWeb/Layout/FormattingContext.h b/Libraries/LibWeb/Layout/FormattingContext.h
index 217b3af3aa..8885fb3ba2 100644
--- a/Libraries/LibWeb/Layout/FormattingContext.h
+++ b/Libraries/LibWeb/Layout/FormattingContext.h
@@ -34,23 +34,23 @@ class FormattingContext {
 public:
     virtual void run(LayoutMode) = 0;
 
-    LayoutBox& context_box() { return m_context_box; }
-    const LayoutBox& context_box() const { return m_context_box; }
+    Box& context_box() { return m_context_box; }
+    const Box& context_box() const { return m_context_box; }
 
 protected:
-    FormattingContext(LayoutBox&);
+    FormattingContext(Box&);
     virtual ~FormattingContext();
 
-    static void layout_inside(LayoutBox&, LayoutMode);
+    static void layout_inside(Box&, LayoutMode);
 
     struct ShrinkToFitResult {
         float preferred_width { 0 };
         float preferred_minimum_width { 0 };
     };
 
-    ShrinkToFitResult calculate_shrink_to_fit_widths(LayoutBox&);
+    ShrinkToFitResult calculate_shrink_to_fit_widths(Box&);
 
-    LayoutBox& m_context_box;
+    Box& m_context_box;
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutFrame.cpp b/Libraries/LibWeb/Layout/FrameBox.cpp
index ccd3666c8a..fb475014e8 100644
--- a/Libraries/LibWeb/Layout/LayoutFrame.cpp
+++ b/Libraries/LibWeb/Layout/FrameBox.cpp
@@ -31,24 +31,24 @@
 #include <LibGfx/StylePainter.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutFrame.h>
+#include <LibWeb/Layout/FrameBox.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Page/Frame.h>
 
 //#define DEBUG_HIGHLIGHT_FOCUSED_FRAME
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutFrame::LayoutFrame(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutReplaced(document, element, move(style))
+FrameBox::FrameBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : ReplacedBox(document, element, move(style))
 {
 }
 
-LayoutFrame::~LayoutFrame()
+FrameBox::~FrameBox()
 {
 }
 
-void LayoutFrame::prepare_for_replaced_layout()
+void FrameBox::prepare_for_replaced_layout()
 {
     ASSERT(dom_node().content_frame());
 
@@ -59,9 +59,9 @@ void LayoutFrame::prepare_for_replaced_layout()
     set_intrinsic_height(dom_node().attribute(HTML::AttributeNames::height).to_int().value_or(150));
 }
 
-void LayoutFrame::paint(PaintContext& context, PaintPhase phase)
+void FrameBox::paint(PaintContext& context, PaintPhase phase)
 {
-    LayoutReplaced::paint(context, phase);
+    ReplacedBox::paint(context, phase);
 
     if (phase == PaintPhase::Foreground) {
         auto* hosted_document = dom_node().content_document();
@@ -78,7 +78,7 @@ void LayoutFrame::paint(PaintContext& context, PaintPhase phase)
         context.painter().translate(absolute_x(), absolute_y());
 
         context.set_viewport_rect({ {}, dom_node().content_frame()->size() });
-        const_cast<LayoutDocument*>(hosted_layout_tree)->paint_all_phases(context);
+        const_cast<Layout::InitialContainingBlockBox*>(hosted_layout_tree)->paint_all_phases(context);
 
         context.set_viewport_rect(old_viewport_rect);
         context.painter().restore();
@@ -91,9 +91,9 @@ void LayoutFrame::paint(PaintContext& context, PaintPhase phase)
     }
 }
 
-void LayoutFrame::did_set_rect()
+void FrameBox::did_set_rect()
 {
-    LayoutReplaced::did_set_rect();
+    ReplacedBox::did_set_rect();
 
     ASSERT(dom_node().content_frame());
     dom_node().content_frame()->set_size(size().to_type<int>());
diff --git a/Libraries/LibWeb/Layout/LayoutFrame.h b/Libraries/LibWeb/Layout/FrameBox.h
index fa9be9bf1d..840430e4f6 100644
--- a/Libraries/LibWeb/Layout/LayoutFrame.h
+++ b/Libraries/LibWeb/Layout/FrameBox.h
@@ -27,29 +27,29 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLIFrameElement.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutFrame final : public LayoutReplaced {
+class FrameBox final : public ReplacedBox {
 public:
-    LayoutFrame(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutFrame() override;
+    FrameBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~FrameBox() override;
 
     virtual void paint(PaintContext&, PaintPhase) override;
     virtual void prepare_for_replaced_layout() override;
 
-    const HTML::HTMLIFrameElement& dom_node() const { return downcast<HTML::HTMLIFrameElement>(LayoutReplaced::dom_node()); }
-    HTML::HTMLIFrameElement& dom_node() { return downcast<HTML::HTMLIFrameElement>(LayoutReplaced::dom_node()); }
+    const HTML::HTMLIFrameElement& dom_node() const { return downcast<HTML::HTMLIFrameElement>(ReplacedBox::dom_node()); }
+    HTML::HTMLIFrameElement& dom_node() { return downcast<HTML::HTMLIFrameElement>(ReplacedBox::dom_node()); }
 
 private:
     virtual bool is_frame() const final { return true; }
-    virtual const char* class_name() const override { return "LayoutFrame"; }
+    virtual const char* class_name() const override { return "FrameBox"; }
     virtual void did_set_rect() override;
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutFrame)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_frame(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::FrameBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_frame(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutImage.cpp b/Libraries/LibWeb/Layout/ImageBox.cpp
index e3b89a0fc5..541dc7672a 100644
--- a/Libraries/LibWeb/Layout/LayoutImage.cpp
+++ b/Libraries/LibWeb/Layout/ImageBox.cpp
@@ -28,31 +28,31 @@
 #include <LibGfx/Font.h>
 #include <LibGfx/ImageDecoder.h>
 #include <LibGfx/StylePainter.h>
-#include <LibWeb/Layout/LayoutImage.h>
+#include <LibWeb/Layout/ImageBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutImage::LayoutImage(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style, const ImageLoader& image_loader)
-    : LayoutReplaced(document, element, move(style))
+ImageBox::ImageBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style, const ImageLoader& image_loader)
+    : ReplacedBox(document, element, move(style))
     , m_image_loader(image_loader)
 {
 }
 
-LayoutImage::~LayoutImage()
+ImageBox::~ImageBox()
 {
 }
 
-int LayoutImage::preferred_width() const
+int ImageBox::preferred_width() const
 {
     return dom_node().attribute(HTML::AttributeNames::width).to_int().value_or(m_image_loader.width());
 }
 
-int LayoutImage::preferred_height() const
+int ImageBox::preferred_height() const
 {
     return dom_node().attribute(HTML::AttributeNames::height).to_int().value_or(m_image_loader.height());
 }
 
-void LayoutImage::prepare_for_replaced_layout()
+void ImageBox::prepare_for_replaced_layout()
 {
     if (!m_image_loader.has_loaded_or_failed()) {
         set_has_intrinsic_width(true);
@@ -93,7 +93,7 @@ void LayoutImage::prepare_for_replaced_layout()
     }
 }
 
-void LayoutImage::paint(PaintContext& context, PaintPhase phase)
+void ImageBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
@@ -102,7 +102,7 @@ void LayoutImage::paint(PaintContext& context, PaintPhase phase)
     if (!context.viewport_rect().intersects(enclosing_int_rect(absolute_rect())))
         return;
 
-    LayoutReplaced::paint(context, phase);
+    ReplacedBox::paint(context, phase);
 
     if (phase == PaintPhase::Foreground) {
         if (renders_as_alt_text()) {
@@ -119,14 +119,14 @@ void LayoutImage::paint(PaintContext& context, PaintPhase phase)
     }
 }
 
-bool LayoutImage::renders_as_alt_text() const
+bool ImageBox::renders_as_alt_text() const
 {
     if (is<HTML::HTMLImageElement>(dom_node()))
         return !m_image_loader.has_image();
     return false;
 }
 
-void LayoutImage::set_visible_in_viewport(Badge<LayoutDocument>, bool visible_in_viewport)
+void ImageBox::set_visible_in_viewport(Badge<Layout::InitialContainingBlockBox>, bool visible_in_viewport)
 {
     m_image_loader.set_visible_in_viewport(visible_in_viewport);
 }
diff --git a/Libraries/LibWeb/Layout/LayoutImage.h b/Libraries/LibWeb/Layout/ImageBox.h
index 3cbf29a19c..38a1f89cbe 100644
--- a/Libraries/LibWeb/Layout/LayoutImage.h
+++ b/Libraries/LibWeb/Layout/ImageBox.h
@@ -27,26 +27,26 @@
 #pragma once
 
 #include <LibWeb/HTML/HTMLImageElement.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutImage : public LayoutReplaced {
+class ImageBox : public ReplacedBox {
 public:
-    LayoutImage(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>, const ImageLoader&);
-    virtual ~LayoutImage() override;
+    ImageBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>, const ImageLoader&);
+    virtual ~ImageBox() override;
 
     virtual void prepare_for_replaced_layout() override;
     virtual void paint(PaintContext&, PaintPhase) override;
 
-    const DOM::Element& dom_node() const { return static_cast<const DOM::Element&>(LayoutReplaced::dom_node()); }
+    const DOM::Element& dom_node() const { return static_cast<const DOM::Element&>(ReplacedBox::dom_node()); }
 
     bool renders_as_alt_text() const;
 
-    void set_visible_in_viewport(Badge<LayoutDocument>, bool);
+    void set_visible_in_viewport(Badge<InitialContainingBlockBox>, bool);
 
 private:
-    virtual const char* class_name() const override { return "LayoutImage"; }
+    virtual const char* class_name() const override { return "ImageBox"; }
     virtual bool is_image() const override { return true; }
 
     int preferred_width() const;
@@ -57,6 +57,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutImage)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_image(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::ImageBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_image(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutDocument.cpp b/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
index 9a5b1b0632..320f0f770c 100644
--- a/Libraries/LibWeb/Layout/LayoutDocument.cpp
+++ b/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
@@ -25,31 +25,31 @@
  */
 
 #include <LibWeb/Dump.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutImage.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/ImageBox.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <LibWeb/Page/Frame.h>
 #include <LibWeb/Painting/StackingContext.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutDocument::LayoutDocument(DOM::Document& document, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBlock(document, &document, move(style))
+InitialContainingBlockBox::InitialContainingBlockBox(DOM::Document& document, NonnullRefPtr<CSS::StyleProperties> style)
+    : BlockBox(document, &document, move(style))
 {
 }
 
-LayoutDocument::~LayoutDocument()
+InitialContainingBlockBox::~InitialContainingBlockBox()
 {
 }
 
-void LayoutDocument::build_stacking_context_tree()
+void InitialContainingBlockBox::build_stacking_context_tree()
 {
     if (stacking_context())
         return;
 
     set_stacking_context(make<StackingContext>(*this, nullptr));
 
-    for_each_in_subtree_of_type<LayoutBox>([&](LayoutBox& box) {
+    for_each_in_subtree_of_type<Box>([&](Box& box) {
         if (&box == this)
             return IterationDecision::Continue;
         if (!box.establishes_stacking_context()) {
@@ -63,16 +63,16 @@ void LayoutDocument::build_stacking_context_tree()
     });
 }
 
-void LayoutDocument::did_set_viewport_rect(Badge<Frame>, const Gfx::IntRect& a_viewport_rect)
+void InitialContainingBlockBox::did_set_viewport_rect(Badge<Frame>, const Gfx::IntRect& a_viewport_rect)
 {
     Gfx::FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
-    for_each_in_subtree_of_type<LayoutImage>([&](auto& layout_image) {
-        const_cast<LayoutImage&>(layout_image).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.absolute_rect()));
+    for_each_in_subtree_of_type<ImageBox>([&](auto& layout_image) {
+        const_cast<ImageBox&>(layout_image).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.absolute_rect()));
         return IterationDecision::Continue;
     });
 }
 
-void LayoutDocument::paint_all_phases(PaintContext& context)
+void InitialContainingBlockBox::paint_all_phases(PaintContext& context)
 {
     paint(context, PaintPhase::Background);
     paint(context, PaintPhase::Border);
@@ -82,17 +82,17 @@ void LayoutDocument::paint_all_phases(PaintContext& context)
     paint(context, PaintPhase::Overlay);
 }
 
-void LayoutDocument::paint(PaintContext& context, PaintPhase phase)
+void InitialContainingBlockBox::paint(PaintContext& context, PaintPhase phase)
 {
     stacking_context()->paint(context, phase);
 }
 
-HitTestResult LayoutDocument::hit_test(const Gfx::IntPoint& position, HitTestType type) const
+HitTestResult InitialContainingBlockBox::hit_test(const Gfx::IntPoint& position, HitTestType type) const
 {
     return stacking_context()->hit_test(position, type);
 }
 
-void LayoutDocument::recompute_selection_states()
+void InitialContainingBlockBox::recompute_selection_states()
 {
     SelectionState state = SelectionState::None;
 
@@ -118,13 +118,13 @@ void LayoutDocument::recompute_selection_states()
     });
 }
 
-void LayoutDocument::set_selection(const LayoutRange& selection)
+void InitialContainingBlockBox::set_selection(const LayoutRange& selection)
 {
     m_selection = selection;
     recompute_selection_states();
 }
 
-void LayoutDocument::set_selection_end(const LayoutPosition& position)
+void InitialContainingBlockBox::set_selection_end(const LayoutPosition& position)
 {
     m_selection.set_end(position);
     recompute_selection_states();
diff --git a/Libraries/LibWeb/Layout/LayoutDocument.h b/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
index 33e55b4f5b..a02834ee17 100644
--- a/Libraries/LibWeb/Layout/LayoutDocument.h
+++ b/Libraries/LibWeb/Layout/InitialContainingBlockBox.h
@@ -27,17 +27,17 @@
 #pragma once
 
 #include <LibWeb/DOM/Document.h>
-#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/BlockBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutDocument final : public LayoutBlock {
+class InitialContainingBlockBox final : public BlockBox {
 public:
-    explicit LayoutDocument(DOM::Document&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutDocument() override;
+    explicit InitialContainingBlockBox(DOM::Document&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~InitialContainingBlockBox() override;
 
-    const DOM::Document& dom_node() const { return static_cast<const DOM::Document&>(*LayoutNode::dom_node()); }
-    virtual const char* class_name() const override { return "LayoutDocument"; }
+    const DOM::Document& dom_node() const { return static_cast<const DOM::Document&>(*Node::dom_node()); }
+    virtual const char* class_name() const override { return "InitialContainingBlockBox"; }
 
     void paint_all_phases(PaintContext&);
     virtual void paint(PaintContext&, PaintPhase) override;
@@ -62,6 +62,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutDocument)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_root(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::InitialContainingBlockBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_root(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/InlineFormattingContext.cpp b/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
index 5edcce8192..55219cbb1d 100644
--- a/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
+++ b/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
@@ -27,15 +27,15 @@
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/Dump.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Layout/InlineFormattingContext.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutBox.h>
-#include <LibWeb/Layout/LayoutInline.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/InlineNode.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
 namespace Web::Layout {
 
-InlineFormattingContext::InlineFormattingContext(LayoutBox& containing_block)
+InlineFormattingContext::InlineFormattingContext(Box& containing_block)
     : FormattingContext(containing_block)
 {
 }
@@ -46,7 +46,7 @@ InlineFormattingContext::~InlineFormattingContext()
 
 void InlineFormattingContext::run(LayoutMode layout_mode)
 {
-    auto& containing_block = downcast<LayoutBlock>(context_box());
+    auto& containing_block = downcast<BlockBox>(context_box());
 
     ASSERT(containing_block.children_are_inline());
     containing_block.line_boxes().clear();
@@ -129,7 +129,7 @@ void InlineFormattingContext::run(LayoutMode layout_mode)
             }
 
             if (fragment.layout_node().is_box())
-                dimension_box_on_line(const_cast<LayoutBox&>(downcast<LayoutBox>(fragment.layout_node())), layout_mode);
+                dimension_box_on_line(const_cast<Box&>(downcast<Box>(fragment.layout_node())), layout_mode);
 
             float final_line_box_width = 0;
             for (auto& fragment : line_box.fragments())
@@ -149,19 +149,19 @@ void InlineFormattingContext::run(LayoutMode layout_mode)
     containing_block.set_height(content_height);
 }
 
-void InlineFormattingContext::dimension_box_on_line(LayoutBox& box, LayoutMode layout_mode)
+void InlineFormattingContext::dimension_box_on_line(Box& box, LayoutMode layout_mode)
 {
-    auto& containing_block = downcast<LayoutBlock>(context_box());
+    auto& containing_block = downcast<BlockBox>(context_box());
 
     if (box.is_replaced()) {
-        auto& replaced = const_cast<LayoutReplaced&>(downcast<LayoutReplaced>(box));
+        auto& replaced = const_cast<ReplacedBox&>(downcast<ReplacedBox>(box));
         replaced.set_width(replaced.calculate_width());
         replaced.set_height(replaced.calculate_height());
         return;
     }
 
     if (box.is_inline_block()) {
-        auto& inline_block = const_cast<LayoutBlock&>(downcast<LayoutBlock>(box));
+        auto& inline_block = const_cast<BlockBox&>(downcast<BlockBox>(box));
 
         if (inline_block.style().width().is_undefined_or_auto()) {
             auto result = calculate_shrink_to_fit_widths(inline_block);
diff --git a/Libraries/LibWeb/Layout/InlineFormattingContext.h b/Libraries/LibWeb/Layout/InlineFormattingContext.h
index 6534b6d6be..8c23a7f256 100644
--- a/Libraries/LibWeb/Layout/InlineFormattingContext.h
+++ b/Libraries/LibWeb/Layout/InlineFormattingContext.h
@@ -33,13 +33,13 @@ namespace Web::Layout {
 
 class InlineFormattingContext final : public FormattingContext {
 public:
-    InlineFormattingContext(LayoutBox& containing_block);
+    InlineFormattingContext(Box& containing_block);
     ~InlineFormattingContext();
 
     virtual void run(LayoutMode) override;
 
 private:
-    void dimension_box_on_line(LayoutBox&, LayoutMode);
+    void dimension_box_on_line(Box&, LayoutMode);
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutInline.cpp b/Libraries/LibWeb/Layout/InlineNode.cpp
index ce77bc8631..8abfd4cab0 100644
--- a/Libraries/LibWeb/Layout/LayoutInline.cpp
+++ b/Libraries/LibWeb/Layout/InlineNode.cpp
@@ -25,18 +25,17 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutInline.h>
+#include <LibWeb/Layout/InlineNode.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutInline::LayoutInline(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutNodeWithStyleAndBoxModelMetrics(document, &element, move(style))
+InlineNode::InlineNode(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Layout::NodeWithStyleAndBoxModelMetrics(document, &element, move(style))
 {
     set_inline(true);
 }
 
-LayoutInline::~LayoutInline()
+InlineNode::~InlineNode()
 {
 }
 
diff --git a/Libraries/LibWeb/Layout/LayoutInline.h b/Libraries/LibWeb/Layout/InlineNode.h
index 30bc455f15..f13dcc4494 100644
--- a/Libraries/LibWeb/Layout/LayoutInline.h
+++ b/Libraries/LibWeb/Layout/InlineNode.h
@@ -26,17 +26,15 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/Box.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutBlock;
-
-class LayoutInline : public LayoutNodeWithStyleAndBoxModelMetrics {
+class InlineNode : public NodeWithStyleAndBoxModelMetrics {
 public:
-    LayoutInline(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutInline() override;
-    virtual const char* class_name() const override { return "LayoutInline"; }
+    InlineNode(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~InlineNode() override;
+    virtual const char* class_name() const override { return "InlineNode"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutPosition.cpp b/Libraries/LibWeb/Layout/LayoutPosition.cpp
index e171a34c15..db0f8f2de1 100644
--- a/Libraries/LibWeb/Layout/LayoutPosition.cpp
+++ b/Libraries/LibWeb/Layout/LayoutPosition.cpp
@@ -24,10 +24,10 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <LibWeb/Layout/LayoutNode.h>
 #include <LibWeb/Layout/LayoutPosition.h>
+#include <LibWeb/Layout/Node.h>
 
-namespace Web {
+namespace Web::Layout {
 
 LayoutRange LayoutRange::normalized() const
 {
diff --git a/Libraries/LibWeb/Layout/LayoutPosition.h b/Libraries/LibWeb/Layout/LayoutPosition.h
index fc5fb86e5d..fa132c7ee6 100644
--- a/Libraries/LibWeb/Layout/LayoutPosition.h
+++ b/Libraries/LibWeb/Layout/LayoutPosition.h
@@ -28,12 +28,12 @@
 
 #include <AK/RefPtr.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutNode;
+class Node;
 
 struct LayoutPosition {
-    RefPtr<LayoutNode> layout_node;
+    RefPtr<Node> layout_node;
     int index_in_node { 0 };
 };
 
diff --git a/Libraries/LibWeb/Layout/LayoutTreeBuilder.cpp b/Libraries/LibWeb/Layout/LayoutTreeBuilder.cpp
index 9848289260..83fd63de7a 100644
--- a/Libraries/LibWeb/Layout/LayoutTreeBuilder.cpp
+++ b/Libraries/LibWeb/Layout/LayoutTreeBuilder.cpp
@@ -26,18 +26,18 @@
 
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/ParentNode.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutTable.h>
-#include <LibWeb/Layout/LayoutText.h>
 #include <LibWeb/Layout/LayoutTreeBuilder.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/TableBox.h>
+#include <LibWeb/Layout/TextNode.h>
 
-namespace Web {
+namespace Web::Layout {
 
 LayoutTreeBuilder::LayoutTreeBuilder()
 {
 }
 
-static RefPtr<LayoutNode> create_layout_tree(DOM::Node& node, const CSS::StyleProperties* parent_style)
+static RefPtr<Node> create_layout_tree(DOM::Node& node, const CSS::StyleProperties* parent_style)
 {
     auto layout_node = node.create_layout_node(parent_style);
     if (!layout_node)
@@ -46,7 +46,7 @@ static RefPtr<LayoutNode> create_layout_tree(DOM::Node& node, const CSS::StylePr
     if (!node.has_children())
         return layout_node;
 
-    NonnullRefPtrVector<LayoutNode> layout_children;
+    NonnullRefPtrVector<Node> layout_children;
     bool have_inline_children = false;
     bool have_noninline_children = false;
 
@@ -63,7 +63,7 @@ static RefPtr<LayoutNode> create_layout_tree(DOM::Node& node, const CSS::StylePr
 
     for (auto& layout_child : layout_children) {
         if (have_noninline_children && have_inline_children && layout_child.is_inline()) {
-            if (is<LayoutText>(layout_child) && downcast<LayoutText>(layout_child).text_for_style(*parent_style) == " ")
+            if (is<TextNode>(layout_child) && downcast<TextNode>(layout_child).text_for_style(*parent_style) == " ")
                 continue;
             layout_node->inline_wrapper().append_child(layout_child);
         } else {
@@ -77,7 +77,7 @@ static RefPtr<LayoutNode> create_layout_tree(DOM::Node& node, const CSS::StylePr
     return layout_node;
 }
 
-RefPtr<LayoutNode> LayoutTreeBuilder::build(DOM::Node& node)
+RefPtr<Node> LayoutTreeBuilder::build(DOM::Node& node)
 {
     if (!is<DOM::Document>(node) && node.has_children()) {
         dbg() << "FIXME: Support building partial layout trees.";
diff --git a/Libraries/LibWeb/Layout/LayoutTreeBuilder.h b/Libraries/LibWeb/Layout/LayoutTreeBuilder.h
index 9a41ad0b0c..fe96b3db88 100644
--- a/Libraries/LibWeb/Layout/LayoutTreeBuilder.h
+++ b/Libraries/LibWeb/Layout/LayoutTreeBuilder.h
@@ -29,13 +29,13 @@
 #include <AK/RefPtr.h>
 #include <LibWeb/Forward.h>
 
-namespace Web {
+namespace Web::Layout {
 
 class LayoutTreeBuilder {
 public:
     LayoutTreeBuilder();
 
-    RefPtr<LayoutNode> build(DOM::Node&);
+    RefPtr<Node> build(DOM::Node&);
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LineBox.cpp b/Libraries/LibWeb/Layout/LineBox.cpp
index bf2840faf8..99cc777fcb 100644
--- a/Libraries/LibWeb/Layout/LineBox.cpp
+++ b/Libraries/LibWeb/Layout/LineBox.cpp
@@ -25,20 +25,20 @@
  */
 
 #include <AK/Utf8View.h>
-#include <LibWeb/Layout/LayoutBox.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Layout/LineBox.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <ctype.h>
 
-namespace Web {
+namespace Web::Layout {
 
-void LineBox::add_fragment(const LayoutNode& layout_node, int start, int length, int width, int height)
+void LineBox::add_fragment(const Node& layout_node, int start, int length, int width, int height)
 {
     bool text_align_is_justify = layout_node.style().text_align() == CSS::TextAlign::Justify;
     if (!text_align_is_justify && !m_fragments.is_empty() && &m_fragments.last().layout_node() == &layout_node) {
-        // The fragment we're adding is from the last LayoutNode on the line.
-        // Expand the last fragment instead of adding a new one with the same LayoutNode.
+        // The fragment we're adding is from the last Layout::Node on the line.
+        // Expand the last fragment instead of adding a new one with the same Layout::Node.
         m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
         m_fragments.last().set_width(m_fragments.last().width() + width);
     } else {
@@ -46,8 +46,8 @@ void LineBox::add_fragment(const LayoutNode& layout_node, int start, int length,
     }
     m_width += width;
 
-    if (is<LayoutBox>(layout_node))
-        const_cast<LayoutBox&>(downcast<LayoutBox>(layout_node)).set_containing_line_box_fragment(m_fragments.last());
+    if (is<Box>(layout_node))
+        const_cast<Box&>(downcast<Box>(layout_node)).set_containing_line_box_fragment(m_fragments.last());
 }
 
 void LineBox::trim_trailing_whitespace()
diff --git a/Libraries/LibWeb/Layout/LineBox.h b/Libraries/LibWeb/Layout/LineBox.h
index eeb177d638..242adf0007 100644
--- a/Libraries/LibWeb/Layout/LineBox.h
+++ b/Libraries/LibWeb/Layout/LineBox.h
@@ -30,7 +30,7 @@
 #include <AK/Vector.h>
 #include <LibWeb/Layout/LineBoxFragment.h>
 
-namespace Web {
+namespace Web::Layout {
 
 class LineBox {
 public:
@@ -38,7 +38,7 @@ public:
 
     float width() const { return m_width; }
 
-    void add_fragment(const LayoutNode& layout_node, int start, int length, int width, int height);
+    void add_fragment(const Node& layout_node, int start, int length, int width, int height);
 
     const NonnullOwnPtrVector<LineBoxFragment>& fragments() const { return m_fragments; }
     NonnullOwnPtrVector<LineBoxFragment>& fragments() { return m_fragments; }
@@ -48,8 +48,8 @@ public:
     bool ends_in_whitespace() const;
 
 private:
-    friend class LayoutBlock;
-    friend class Layout::InlineFormattingContext;
+    friend class BlockBox;
+    friend class InlineFormattingContext;
     NonnullOwnPtrVector<LineBoxFragment> m_fragments;
     float m_width { 0 };
 };
diff --git a/Libraries/LibWeb/Layout/LineBoxFragment.cpp b/Libraries/LibWeb/Layout/LineBoxFragment.cpp
index 05332f8007..2c4be7f141 100644
--- a/Libraries/LibWeb/Layout/LineBoxFragment.cpp
+++ b/Libraries/LibWeb/Layout/LineBoxFragment.cpp
@@ -26,13 +26,13 @@
 
 #include <AK/Utf8View.h>
 #include <LibGUI/Painter.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Layout/LineBoxFragment.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <LibWeb/Painting/PaintContext.h>
 #include <ctype.h>
 
-namespace Web {
+namespace Web::Layout {
 
 void LineBoxFragment::paint(PaintContext& context)
 {
@@ -41,9 +41,8 @@ void LineBoxFragment::paint(PaintContext& context)
             return;
     }
 
-    if (is<LayoutText>(layout_node())) {
-        downcast<LayoutText>(layout_node()).paint_fragment(context, *this);
-    }
+    if (is<TextNode>(layout_node()))
+        downcast<TextNode>(layout_node()).paint_fragment(context, *this);
 }
 
 bool LineBoxFragment::ends_in_whitespace() const
@@ -61,9 +60,9 @@ bool LineBoxFragment::is_justifiable_whitespace() const
 
 StringView LineBoxFragment::text() const
 {
-    if (!is<LayoutText>(layout_node()))
+    if (!is<TextNode>(layout_node()))
         return {};
-    return downcast<LayoutText>(layout_node()).text_for_rendering().substring_view(m_start, m_length);
+    return downcast<TextNode>(layout_node()).text_for_rendering().substring_view(m_start, m_length);
 }
 
 const Gfx::FloatRect LineBoxFragment::absolute_rect() const
@@ -78,7 +77,7 @@ int LineBoxFragment::text_index_at(float x) const
 {
     if (!layout_node().is_text())
         return 0;
-    auto& layout_text = downcast<LayoutText>(layout_node());
+    auto& layout_text = downcast<TextNode>(layout_node());
     auto& font = layout_text.specified_style().font();
     Utf8View view(text());
 
@@ -100,10 +99,10 @@ int LineBoxFragment::text_index_at(float x) const
 
 Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
 {
-    if (layout_node().selection_state() == LayoutNode::SelectionState::None)
+    if (layout_node().selection_state() == Node::SelectionState::None)
         return {};
 
-    if (layout_node().selection_state() == LayoutNode::SelectionState::Full)
+    if (layout_node().selection_state() == Node::SelectionState::Full)
         return absolute_rect();
 
     auto selection = layout_node().root().selection().normalized();
@@ -116,7 +115,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
     const auto end_index = m_start + m_length;
     auto text = this->text();
 
-    if (layout_node().selection_state() == LayoutNode::SelectionState::StartAndEnd) {
+    if (layout_node().selection_state() == Node::SelectionState::StartAndEnd) {
         // we are in the start/end node (both the same)
         if (start_index > selection.end().index_in_node)
             return {};
@@ -137,7 +136,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
 
         return rect;
     }
-    if (layout_node().selection_state() == LayoutNode::SelectionState::Start) {
+    if (layout_node().selection_state() == Node::SelectionState::Start) {
         // we are in the start node
         if (end_index < selection.start().index_in_node)
             return {};
@@ -153,7 +152,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
 
         return rect;
     }
-    if (layout_node().selection_state() == LayoutNode::SelectionState::End) {
+    if (layout_node().selection_state() == Node::SelectionState::End) {
         // we are in the end node
         if (start_index > selection.end().index_in_node)
             return {};
diff --git a/Libraries/LibWeb/Layout/LineBoxFragment.h b/Libraries/LibWeb/Layout/LineBoxFragment.h
index f2c71b4ff9..2c6662e8b4 100644
--- a/Libraries/LibWeb/Layout/LineBoxFragment.h
+++ b/Libraries/LibWeb/Layout/LineBoxFragment.h
@@ -31,13 +31,13 @@
 #include <LibGfx/Rect.h>
 #include <LibWeb/Forward.h>
 
-namespace Web {
+namespace Web::Layout {
 
 class LineBoxFragment : public Weakable<LineBoxFragment> {
     friend class LineBox;
 
 public:
-    LineBoxFragment(const LayoutNode& layout_node, int start, int length, const Gfx::FloatPoint& offset, const Gfx::FloatSize& size)
+    LineBoxFragment(const Node& layout_node, int start, int length, const Gfx::FloatPoint& offset, const Gfx::FloatSize& size)
         : m_layout_node(layout_node)
         , m_start(start)
         , m_length(length)
@@ -46,7 +46,7 @@ public:
     {
     }
 
-    const LayoutNode& layout_node() const { return m_layout_node; }
+    const Node& layout_node() const { return m_layout_node; }
     int start() const { return m_start; }
     int length() const { return m_length; }
     const Gfx::FloatRect absolute_rect() const;
@@ -72,7 +72,7 @@ public:
     Gfx::FloatRect selection_rect(const Gfx::Font&) const;
 
 private:
-    const LayoutNode& m_layout_node;
+    const Node& m_layout_node;
     int m_start { 0 };
     int m_length { 0 };
     Gfx::FloatPoint m_offset;
diff --git a/Libraries/LibWeb/Layout/LayoutListItem.cpp b/Libraries/LibWeb/Layout/ListItemBox.cpp
index 5b8cc5165e..5e8f683c7f 100644
--- a/Libraries/LibWeb/Layout/LayoutListItem.cpp
+++ b/Libraries/LibWeb/Layout/ListItemBox.cpp
@@ -24,21 +24,21 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <LibWeb/Layout/LayoutListItem.h>
-#include <LibWeb/Layout/LayoutListItemMarker.h>
+#include <LibWeb/Layout/ListItemBox.h>
+#include <LibWeb/Layout/ListItemMarkerBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutListItem::LayoutListItem(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBlock(document, &element, move(style))
+ListItemBox::ListItemBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Layout::BlockBox(document, &element, move(style))
 {
 }
 
-LayoutListItem::~LayoutListItem()
+ListItemBox::~ListItemBox()
 {
 }
 
-void LayoutListItem::layout_marker()
+void ListItemBox::layout_marker()
 {
     if (m_marker) {
         remove_child(*m_marker);
@@ -49,7 +49,7 @@ void LayoutListItem::layout_marker()
         return;
 
     if (!m_marker) {
-        m_marker = adopt(*new LayoutListItemMarker(document()));
+        m_marker = adopt(*new ListItemMarkerBox(document()));
         if (first_child())
             m_marker->set_inline(first_child()->is_inline());
         append_child(*m_marker);
diff --git a/Libraries/LibWeb/Layout/LayoutListItem.h b/Libraries/LibWeb/Layout/ListItemBox.h
index 2bb8dcb80f..d374ab609d 100644
--- a/Libraries/LibWeb/Layout/LayoutListItem.h
+++ b/Libraries/LibWeb/Layout/ListItemBox.h
@@ -27,28 +27,28 @@
 #pragma once
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/BlockBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutListItemMarker;
+class ListItemMarkerBox;
 
-class LayoutListItem final : public LayoutBlock {
+class ListItemBox final : public BlockBox {
 public:
-    LayoutListItem(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutListItem() override;
+    ListItemBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~ListItemBox() override;
 
     void layout_marker();
 
 private:
-    virtual const char* class_name() const override { return "LayoutListItem"; }
+    virtual const char* class_name() const override { return "ListItemBox"; }
     virtual bool is_list_item() const override { return true; }
 
-    RefPtr<LayoutListItemMarker> m_marker;
+    RefPtr<ListItemMarkerBox> m_marker;
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutListItem)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_list_item(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::ListItemBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_list_item(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutListItemMarker.cpp b/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp
index bc51ccdbb3..332a73e5b7 100644
--- a/Libraries/LibWeb/Layout/LayoutListItemMarker.cpp
+++ b/Libraries/LibWeb/Layout/ListItemMarkerBox.cpp
@@ -25,20 +25,20 @@
  */
 
 #include <LibGUI/Painter.h>
-#include <LibWeb/Layout/LayoutListItemMarker.h>
+#include <LibWeb/Layout/ListItemMarkerBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutListItemMarker::LayoutListItemMarker(DOM::Document& document)
-    : LayoutBox(document, nullptr, CSS::StyleProperties::create())
+ListItemMarkerBox::ListItemMarkerBox(DOM::Document& document)
+    : Box(document, nullptr, CSS::StyleProperties::create())
 {
 }
 
-LayoutListItemMarker::~LayoutListItemMarker()
+ListItemMarkerBox::~ListItemMarkerBox()
 {
 }
 
-void LayoutListItemMarker::paint(PaintContext& context, PaintPhase phase)
+void ListItemMarkerBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (phase != PaintPhase::Foreground)
         return;
diff --git a/Libraries/LibWeb/Layout/LayoutListItemMarker.h b/Libraries/LibWeb/Layout/ListItemMarkerBox.h
index 9ad8391408..e32528c99c 100644
--- a/Libraries/LibWeb/Layout/LayoutListItemMarker.h
+++ b/Libraries/LibWeb/Layout/ListItemMarkerBox.h
@@ -26,19 +26,19 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/Box.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutListItemMarker final : public LayoutBox {
+class ListItemMarkerBox final : public Box {
 public:
-    explicit LayoutListItemMarker(DOM::Document&);
-    virtual ~LayoutListItemMarker() override;
+    explicit ListItemMarkerBox(DOM::Document&);
+    virtual ~ListItemMarkerBox() override;
 
     virtual void paint(PaintContext&, PaintPhase) override;
 
 private:
-    virtual const char* class_name() const override { return "LayoutListItemMarker"; }
+    virtual const char* class_name() const override { return "ListItemMarkerBox"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutNode.cpp b/Libraries/LibWeb/Layout/Node.cpp
index 7fcf45e0b8..b843fbc3d5 100644
--- a/Libraries/LibWeb/Layout/LayoutNode.cpp
+++ b/Libraries/LibWeb/Layout/Node.cpp
@@ -27,15 +27,15 @@
 #include <LibGUI/Painter.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/Node.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 #include <LibWeb/Page/Frame.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutNode::LayoutNode(DOM::Document& document, DOM::Node* node)
+Node::Node(DOM::Document& document, DOM::Node* node)
     : m_document(document)
     , m_dom_node(node)
 {
@@ -43,24 +43,24 @@ LayoutNode::LayoutNode(DOM::Document& document, DOM::Node* node)
         m_dom_node->set_layout_node({}, this);
 }
 
-LayoutNode::~LayoutNode()
+Node::~Node()
 {
     if (m_dom_node && m_dom_node->layout_node() == this)
         m_dom_node->set_layout_node({}, nullptr);
 }
 
-bool LayoutNode::can_contain_boxes_with_position_absolute() const
+bool Node::can_contain_boxes_with_position_absolute() const
 {
     return style().position() != CSS::Position::Static || is_root();
 }
 
-const LayoutBlock* LayoutNode::containing_block() const
+const BlockBox* Node::containing_block() const
 {
     auto nearest_block_ancestor = [this] {
         auto* ancestor = parent();
-        while (ancestor && !is<LayoutBlock>(*ancestor))
+        while (ancestor && !is<BlockBox>(*ancestor))
             ancestor = ancestor->parent();
-        return downcast<LayoutBlock>(ancestor);
+        return downcast<BlockBox>(ancestor);
     };
 
     if (is_text())
@@ -72,9 +72,9 @@ const LayoutBlock* LayoutNode::containing_block() const
         auto* ancestor = parent();
         while (ancestor && !ancestor->can_contain_boxes_with_position_absolute())
             ancestor = ancestor->parent();
-        while (ancestor && (!is<LayoutBlock>(ancestor) || ancestor->is_anonymous()))
+        while (ancestor && (!is<BlockBox>(ancestor) || ancestor->is_anonymous()))
             ancestor = ancestor->containing_block();
-        return downcast<LayoutBlock>(ancestor);
+        return downcast<BlockBox>(ancestor);
     }
 
     if (position == CSS::Position::Fixed)
@@ -83,7 +83,7 @@ const LayoutBlock* LayoutNode::containing_block() const
     return nearest_block_ancestor();
 }
 
-void LayoutNode::paint(PaintContext& context, PaintPhase phase)
+void Node::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
@@ -91,7 +91,7 @@ void LayoutNode::paint(PaintContext& context, PaintPhase phase)
     before_children_paint(context, phase);
 
     for_each_child([&](auto& child) {
-        if (child.is_box() && downcast<LayoutBox>(child).stacking_context())
+        if (child.is_box() && downcast<Box>(child).stacking_context())
             return;
         child.paint(context, phase);
     });
@@ -99,13 +99,13 @@ void LayoutNode::paint(PaintContext& context, PaintPhase phase)
     after_children_paint(context, phase);
 }
 
-HitTestResult LayoutNode::hit_test(const Gfx::IntPoint& position, HitTestType type) const
+HitTestResult Node::hit_test(const Gfx::IntPoint& position, HitTestType type) const
 {
     HitTestResult result;
     for_each_child([&](auto& child) {
         // Skip over children that establish their own stacking context.
         // The outer loop who called us will take care of those.
-        if (is<LayoutBox>(child) && downcast<LayoutBox>(child).stacking_context())
+        if (is<Box>(child) && downcast<Box>(child).stacking_context())
             return;
         auto child_result = child.hit_test(position, type);
         if (child_result.layout_node)
@@ -114,38 +114,38 @@ HitTestResult LayoutNode::hit_test(const Gfx::IntPoint& position, HitTestType ty
     return result;
 }
 
-const Frame& LayoutNode::frame() const
+const Frame& Node::frame() const
 {
     ASSERT(document().frame());
     return *document().frame();
 }
 
-Frame& LayoutNode::frame()
+Frame& Node::frame()
 {
     ASSERT(document().frame());
     return *document().frame();
 }
 
-const LayoutDocument& LayoutNode::root() const
+const InitialContainingBlockBox& Node::root() const
 {
     ASSERT(document().layout_node());
     return *document().layout_node();
 }
 
-LayoutDocument& LayoutNode::root()
+InitialContainingBlockBox& Node::root()
 {
     ASSERT(document().layout_node());
     return *document().layout_node();
 }
 
-void LayoutNode::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
+void Node::split_into_lines(BlockBox& container, LayoutMode layout_mode)
 {
     for_each_child([&](auto& child) {
         child.split_into_lines(container, layout_mode);
     });
 }
 
-void LayoutNode::set_needs_display()
+void Node::set_needs_display()
 {
     if (auto* block = containing_block()) {
         block->for_each_fragment([&](auto& fragment) {
@@ -157,17 +157,17 @@ void LayoutNode::set_needs_display()
     }
 }
 
-float LayoutNode::font_size() const
+float Node::font_size() const
 {
     // FIXME: This doesn't work right for relative font-sizes
     auto length = specified_style().length_or_fallback(CSS::PropertyID::FontSize, CSS::Length(10, CSS::Length::Type::Px));
     return length.raw_value();
 }
 
-Gfx::FloatPoint LayoutNode::box_type_agnostic_position() const
+Gfx::FloatPoint Node::box_type_agnostic_position() const
 {
     if (is_box())
-        return downcast<LayoutBox>(*this).absolute_position();
+        return downcast<Box>(*this).absolute_position();
     ASSERT(is_inline());
     Gfx::FloatPoint position;
     if (auto* block = containing_block()) {
@@ -182,14 +182,14 @@ Gfx::FloatPoint LayoutNode::box_type_agnostic_position() const
     return position;
 }
 
-bool LayoutNode::is_floating() const
+bool Node::is_floating() const
 {
     if (!has_style())
         return false;
     return style().float_() != CSS::Float::None;
 }
 
-bool LayoutNode::is_absolutely_positioned() const
+bool Node::is_absolutely_positioned() const
 {
     if (!has_style())
         return false;
@@ -197,7 +197,7 @@ bool LayoutNode::is_absolutely_positioned() const
     return position == CSS::Position::Absolute || position == CSS::Position::Fixed;
 }
 
-bool LayoutNode::is_fixed_position() const
+bool Node::is_fixed_position() const
 {
     if (!has_style())
         return false;
@@ -205,15 +205,15 @@ bool LayoutNode::is_fixed_position() const
     return position == CSS::Position::Fixed;
 }
 
-LayoutNodeWithStyle::LayoutNodeWithStyle(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> specified_style)
-    : LayoutNode(document, node)
+NodeWithStyle::NodeWithStyle(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> specified_style)
+    : Node(document, node)
     , m_specified_style(move(specified_style))
 {
     m_has_style = true;
     apply_style(*m_specified_style);
 }
 
-void LayoutNodeWithStyle::apply_style(const CSS::StyleProperties& specified_style)
+void NodeWithStyle::apply_style(const CSS::StyleProperties& specified_style)
 {
     auto& style = static_cast<MutableLayoutStyle&>(m_style);
 
@@ -251,15 +251,15 @@ void LayoutNodeWithStyle::apply_style(const CSS::StyleProperties& specified_styl
     style.border_bottom().color = specified_style.color_or_fallback(CSS::PropertyID::BorderBottomColor, document(), Color::Transparent);
 }
 
-void LayoutNode::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
+void Node::handle_mousedown(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
 {
 }
 
-void LayoutNode::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
+void Node::handle_mouseup(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
 {
 }
 
-void LayoutNode::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
+void Node::handle_mousemove(Badge<EventHandler>, const Gfx::IntPoint&, unsigned, unsigned)
 {
 }
 
diff --git a/Libraries/LibWeb/Layout/LayoutNode.h b/Libraries/LibWeb/Layout/Node.h
index d3fb8c5d16..93bac6ca39 100644
--- a/Libraries/LibWeb/Layout/LayoutNode.h
+++ b/Libraries/LibWeb/Layout/Node.h
@@ -38,7 +38,7 @@
 #include <LibWeb/Painting/PaintContext.h>
 #include <LibWeb/TreeNode.h>
 
-namespace Web {
+namespace Web::Layout {
 
 enum class LayoutMode {
     Default,
@@ -47,7 +47,7 @@ enum class LayoutMode {
 };
 
 struct HitTestResult {
-    RefPtr<LayoutNode> layout_node;
+    RefPtr<Node> layout_node;
     int index_in_node { 0 };
 
     enum InternalPosition {
@@ -64,9 +64,9 @@ enum class HitTestType {
     TextCursor, // Clicking past the right/bottom edge of text will still hit the text
 };
 
-class LayoutNode : public TreeNode<LayoutNode> {
+class Node : public TreeNode<Node> {
 public:
-    virtual ~LayoutNode();
+    virtual ~Node();
 
     virtual HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const;
 
@@ -80,8 +80,8 @@ public:
     const Frame& frame() const;
     Frame& frame();
 
-    const LayoutDocument& root() const;
-    LayoutDocument& root();
+    const InitialContainingBlockBox& root() const;
+    InitialContainingBlockBox& root();
 
     virtual const char* class_name() const = 0;
     virtual bool is_root() const { return false; }
@@ -130,23 +130,23 @@ public:
     bool is_absolutely_positioned() const;
     bool is_fixed_position() const;
 
-    const LayoutBlock* containing_block() const;
+    const BlockBox* containing_block() const;
 
     bool can_contain_boxes_with_position_absolute() const;
 
-    virtual LayoutNode& inline_wrapper() { return *this; }
+    virtual Node& inline_wrapper() { return *this; }
 
     const CSS::StyleProperties& specified_style() const;
     const ImmutableLayoutStyle& style() const;
 
-    LayoutNodeWithStyle* parent();
-    const LayoutNodeWithStyle* parent() const;
+    NodeWithStyle* parent();
+    const NodeWithStyle* parent() const;
 
-    void inserted_into(LayoutNode&) { }
-    void removed_from(LayoutNode&) { }
+    void inserted_into(Node&) { }
+    void removed_from(Node&) { }
     void children_changed() { }
 
-    virtual void split_into_lines(LayoutBlock& container, LayoutMode);
+    virtual void split_into_lines(BlockBox& container, LayoutMode);
 
     bool is_visible() const { return m_visible; }
     void set_visible(bool visible) { m_visible = visible; }
@@ -162,20 +162,20 @@ public:
 
     enum class SelectionState {
         None,        // No selection
-        Start,       // Selection starts in this LayoutNode
-        End,         // Selection ends in this LayoutNode
-        StartAndEnd, // Selection starts and ends in this LayoutNode
-        Full,        // Selection starts before and ends after this LayoutNode
+        Start,       // Selection starts in this Node
+        End,         // Selection ends in this Node
+        StartAndEnd, // Selection starts and ends in this Node
+        Full,        // Selection starts before and ends after this Node
     };
 
     SelectionState selection_state() const { return m_selection_state; }
     void set_selection_state(SelectionState state) { m_selection_state = state; }
 
 protected:
-    LayoutNode(DOM::Document&, DOM::Node*);
+    Node(DOM::Document&, DOM::Node*);
 
 private:
-    friend class LayoutNodeWithStyle;
+    friend class NodeWithStyle;
 
     NonnullRefPtr<DOM::Document> m_document;
     RefPtr<DOM::Node> m_dom_node;
@@ -187,9 +187,9 @@ private:
     SelectionState m_selection_state { SelectionState::None };
 };
 
-class LayoutNodeWithStyle : public LayoutNode {
+class NodeWithStyle : public Node {
 public:
-    virtual ~LayoutNodeWithStyle() override { }
+    virtual ~NodeWithStyle() override { }
 
     const CSS::StyleProperties& specified_style() const { return m_specified_style; }
     void set_specified_style(const CSS::StyleProperties& style) { m_specified_style = style; }
@@ -199,7 +199,7 @@ public:
     void apply_style(const CSS::StyleProperties&);
 
 protected:
-    LayoutNodeWithStyle(DOM::Document&, DOM::Node*, NonnullRefPtr<CSS::StyleProperties>);
+    NodeWithStyle(DOM::Document&, DOM::Node*, NonnullRefPtr<CSS::StyleProperties>);
 
 private:
     LayoutStyle m_style;
@@ -208,14 +208,14 @@ private:
     CSS::Position m_position;
 };
 
-class LayoutNodeWithStyleAndBoxModelMetrics : public LayoutNodeWithStyle {
+class NodeWithStyleAndBoxModelMetrics : public NodeWithStyle {
 public:
     BoxModelMetrics& box_model() { return m_box_model; }
     const BoxModelMetrics& box_model() const { return m_box_model; }
 
 protected:
-    LayoutNodeWithStyleAndBoxModelMetrics(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
-        : LayoutNodeWithStyle(document, node, move(style))
+    NodeWithStyleAndBoxModelMetrics(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
+        : NodeWithStyle(document, node, move(style))
     {
     }
 
@@ -223,32 +223,32 @@ private:
     BoxModelMetrics m_box_model;
 };
 
-inline const CSS::StyleProperties& LayoutNode::specified_style() const
+inline const CSS::StyleProperties& Node::specified_style() const
 {
     if (m_has_style)
-        return static_cast<const LayoutNodeWithStyle*>(this)->specified_style();
+        return static_cast<const NodeWithStyle*>(this)->specified_style();
     return parent()->specified_style();
 }
 
-inline const ImmutableLayoutStyle& LayoutNode::style() const
+inline const ImmutableLayoutStyle& Node::style() const
 {
     if (m_has_style)
-        return static_cast<const LayoutNodeWithStyle*>(this)->style();
+        return static_cast<const NodeWithStyle*>(this)->style();
     return parent()->style();
 }
 
-inline const LayoutNodeWithStyle* LayoutNode::parent() const
+inline const NodeWithStyle* Node::parent() const
 {
-    return static_cast<const LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
+    return static_cast<const NodeWithStyle*>(TreeNode<Node>::parent());
 }
 
-inline LayoutNodeWithStyle* LayoutNode::parent()
+inline NodeWithStyle* Node::parent()
 {
-    return static_cast<LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
+    return static_cast<NodeWithStyle*>(TreeNode<Node>::parent());
 }
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutNodeWithStyle)
-static bool is_type(const Web::LayoutNode& node) { return node.has_style(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::NodeWithStyle)
+static bool is_type(const Web::Layout::Node& node) { return node.has_style(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutReplaced.cpp b/Libraries/LibWeb/Layout/ReplacedBox.cpp
index 2e7e22bea5..340d96462c 100644
--- a/Libraries/LibWeb/Layout/LayoutReplaced.cpp
+++ b/Libraries/LibWeb/Layout/ReplacedBox.cpp
@@ -25,23 +25,23 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutReplaced::LayoutReplaced(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBox(document, &element, move(style))
+ReplacedBox::ReplacedBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Box(document, &element, move(style))
 {
     // FIXME: Allow non-inline replaced elements.
     set_inline(true);
 }
 
-LayoutReplaced::~LayoutReplaced()
+ReplacedBox::~ReplacedBox()
 {
 }
 
-float LayoutReplaced::calculate_width() const
+float ReplacedBox::calculate_width() const
 {
     // 10.3.2 [Inline,] replaced elements
 
@@ -92,7 +92,7 @@ float LayoutReplaced::calculate_width() const
     return used_width;
 }
 
-float LayoutReplaced::calculate_height() const
+float ReplacedBox::calculate_height() const
 {
     // 10.6.2 Inline replaced elements, block-level replaced elements in normal flow,
     // 'inline-block' replaced elements in normal flow and floating replaced elements
@@ -117,7 +117,7 @@ float LayoutReplaced::calculate_height() const
     return used_height;
 }
 
-void LayoutReplaced::split_into_lines(LayoutBlock& container, LayoutMode)
+void ReplacedBox::split_into_lines(Layout::BlockBox& container, LayoutMode)
 {
     // FIXME: This feels out of place. It would be nice if someone at a higher level
     //        made sure we had usable geometry by the time we start splitting.
diff --git a/Libraries/LibWeb/Layout/LayoutReplaced.h b/Libraries/LibWeb/Layout/ReplacedBox.h
index 14f461e773..aff5ccd5ca 100644
--- a/Libraries/LibWeb/Layout/LayoutReplaced.h
+++ b/Libraries/LibWeb/Layout/ReplacedBox.h
@@ -27,17 +27,17 @@
 #pragma once
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/Box.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutReplaced : public LayoutBox {
+class ReplacedBox : public Box {
 public:
-    LayoutReplaced(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutReplaced() override;
+    ReplacedBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~ReplacedBox() override;
 
-    const DOM::Element& dom_node() const { return downcast<DOM::Element>(*LayoutNode::dom_node()); }
-    DOM::Element& dom_node() { return downcast<DOM::Element>(*LayoutNode::dom_node()); }
+    const DOM::Element& dom_node() const { return downcast<DOM::Element>(*Node::dom_node()); }
+    DOM::Element& dom_node() { return downcast<DOM::Element>(*Node::dom_node()); }
 
     virtual bool is_replaced() const final { return true; }
 
@@ -63,10 +63,10 @@ public:
     virtual void prepare_for_replaced_layout() { }
 
 protected:
-    virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
+    virtual void split_into_lines(Layout::BlockBox& container, LayoutMode) override;
 
 private:
-    virtual const char* class_name() const override { return "LayoutReplaced"; }
+    virtual const char* class_name() const override { return "ReplacedBox"; }
 
     bool m_has_intrinsic_width { false };
     bool m_has_intrinsic_height { false };
@@ -78,6 +78,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutReplaced)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_replaced(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::ReplacedBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_replaced(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutSVG.cpp b/Libraries/LibWeb/Layout/SVGBox.cpp
index b5ea0e63a9..8370d4b9bd 100644
--- a/Libraries/LibWeb/Layout/LayoutSVG.cpp
+++ b/Libraries/LibWeb/Layout/SVGBox.cpp
@@ -27,27 +27,27 @@
 #include <LibGUI/Painter.h>
 #include <LibGfx/Font.h>
 #include <LibGfx/StylePainter.h>
-#include <LibWeb/Layout/LayoutSVG.h>
+#include <LibWeb/Layout/SVGBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutSVG::LayoutSVG(DOM::Document& document, SVG::SVGElement& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutReplaced(document, element, move(style))
+SVGBox::SVGBox(DOM::Document& document, SVG::SVGElement& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : ReplacedBox(document, element, move(style))
 {
 }
 
-void LayoutSVG::before_children_paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGBox::before_children_paint(PaintContext& context, PaintPhase phase)
 {
-    LayoutNode::before_children_paint(context, phase);
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    Node::before_children_paint(context, phase);
+    if (phase != PaintPhase::Foreground)
         return;
     context.svg_context().save();
 }
 
-void LayoutSVG::after_children_paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGBox::after_children_paint(PaintContext& context, PaintPhase phase)
 {
-    LayoutNode::after_children_paint(context, phase);
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    Node::after_children_paint(context, phase);
+    if (phase != PaintPhase::Foreground)
         return;
     context.svg_context().restore();
 }
diff --git a/Libraries/LibWeb/Layout/LayoutSVG.h b/Libraries/LibWeb/Layout/SVGBox.h
index 3ae7ae9cb4..cd289bb199 100644
--- a/Libraries/LibWeb/Layout/LayoutSVG.h
+++ b/Libraries/LibWeb/Layout/SVGBox.h
@@ -26,22 +26,22 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 #include <LibWeb/SVG/SVGElement.h>
 #include <LibWeb/SVG/SVGGraphicsElement.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutSVG : public LayoutReplaced {
+class SVGBox : public ReplacedBox {
 public:
-    LayoutSVG(DOM::Document&, SVG::SVGElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutSVG() override = default;
+    SVGBox(DOM::Document&, SVG::SVGElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~SVGBox() override = default;
 
     virtual void before_children_paint(PaintContext& context, PaintPhase phase) override;
     virtual void after_children_paint(PaintContext& context, PaintPhase phase) override;
 
 private:
-    virtual const char* class_name() const override { return "LayoutSVG"; }
+    virtual const char* class_name() const override { return "SVGBox"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutSVGGraphics.cpp b/Libraries/LibWeb/Layout/SVGGraphicsBox.cpp
index b85237aeea..be1f9541d4 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGGraphics.cpp
+++ b/Libraries/LibWeb/Layout/SVGGraphicsBox.cpp
@@ -24,19 +24,19 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <LibWeb/Layout/LayoutSVGGraphics.h>
+#include <LibWeb/Layout/SVGGraphicsBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutSVGGraphics::LayoutSVGGraphics(DOM::Document& document, SVG::SVGGraphicsElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
-    : LayoutSVG(document, element, properties)
+SVGGraphicsBox::SVGGraphicsBox(DOM::Document& document, SVG::SVGGraphicsElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
+    : SVGBox(document, element, properties)
 {
 }
 
-void LayoutSVGGraphics::before_children_paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGGraphicsBox::before_children_paint(PaintContext& context, PaintPhase phase)
 {
-    LayoutSVG::before_children_paint(context, phase);
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    SVGBox::before_children_paint(context, phase);
+    if (phase != PaintPhase::Foreground)
         return;
 
     auto& graphics_element = downcast<SVG::SVGGraphicsElement>(dom_node());
diff --git a/Libraries/LibWeb/Layout/LayoutSVGGraphics.h b/Libraries/LibWeb/Layout/SVGGraphicsBox.h
index a6e3352752..686ea7adc0 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGGraphics.h
+++ b/Libraries/LibWeb/Layout/SVGGraphicsBox.h
@@ -26,21 +26,21 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutSVG.h>
+#include <LibWeb/Layout/SVGBox.h>
 #include <LibWeb/SVG/SVGElement.h>
 #include <LibWeb/SVG/SVGGraphicsElement.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutSVGGraphics : public LayoutSVG {
+class SVGGraphicsBox : public SVGBox {
 public:
-    LayoutSVGGraphics(DOM::Document&, SVG::SVGGraphicsElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutSVGGraphics() override = default;
+    SVGGraphicsBox(DOM::Document&, SVG::SVGGraphicsElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~SVGGraphicsBox() override = default;
 
-    virtual void before_children_paint(PaintContext& context, LayoutNode::PaintPhase phase) override;
+    virtual void before_children_paint(PaintContext& context, PaintPhase phase) override;
 
 private:
-    virtual const char* class_name() const override { return "LayoutSVGGraphics"; }
+    virtual const char* class_name() const override { return "SVGGraphicsBox"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutSVGPath.cpp b/Libraries/LibWeb/Layout/SVGPathBox.cpp
index f4f1225fac..87879043eb 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGPath.cpp
+++ b/Libraries/LibWeb/Layout/SVGPathBox.cpp
@@ -25,17 +25,17 @@
  */
 
 #include <LibGfx/Painter.h>
-#include <LibWeb/Layout/LayoutSVGPath.h>
+#include <LibWeb/Layout/SVGPathBox.h>
 #include <LibWeb/SVG/SVGPathElement.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutSVGPath::LayoutSVGPath(DOM::Document& document, SVG::SVGPathElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
-    : LayoutSVGGraphics(document, element, properties)
+SVGPathBox::SVGPathBox(DOM::Document& document, SVG::SVGPathElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
+    : SVGGraphicsBox(document, element, properties)
 {
 }
 
-void LayoutSVGPath::prepare_for_replaced_layout()
+void SVGPathBox::prepare_for_replaced_layout()
 {
     auto& bounding_box = dom_node().get_path().bounding_box();
     set_has_intrinsic_width(true);
@@ -47,14 +47,14 @@ void LayoutSVGPath::prepare_for_replaced_layout()
     set_offset(bounding_box.top_left());
 }
 
-void LayoutSVGPath::paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGPathBox::paint(PaintContext& context, PaintPhase phase)
 {
     if (!is_visible())
         return;
 
-    LayoutSVGGraphics::paint(context, phase);
+    SVGGraphicsBox::paint(context, phase);
 
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    if (phase != PaintPhase::Foreground)
         return;
 
     auto& path_element = dom_node();
diff --git a/Libraries/LibWeb/Layout/LayoutSVGPath.h b/Libraries/LibWeb/Layout/SVGPathBox.h
index a378665a8c..0cc0717e1d 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGPath.h
+++ b/Libraries/LibWeb/Layout/SVGPathBox.h
@@ -26,22 +26,22 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutSVGGraphics.h>
+#include <LibWeb/Layout/SVGGraphicsBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutSVGPath final : public LayoutSVGGraphics {
+class SVGPathBox final : public SVGGraphicsBox {
 public:
-    LayoutSVGPath(DOM::Document&, SVG::SVGPathElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutSVGPath() override = default;
+    SVGPathBox(DOM::Document&, SVG::SVGPathElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~SVGPathBox() override = default;
 
-    SVG::SVGPathElement& dom_node() { return downcast<SVG::SVGPathElement>(LayoutSVGGraphics::dom_node()); }
+    SVG::SVGPathElement& dom_node() { return downcast<SVG::SVGPathElement>(SVGGraphicsBox::dom_node()); }
 
     virtual void prepare_for_replaced_layout() override;
     virtual void paint(PaintContext& context, PaintPhase phase) override;
 
 private:
-    virtual const char* class_name() const override { return "LayoutSVGPath"; }
+    virtual const char* class_name() const override { return "SVGPathBox"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutSVGSVG.cpp b/Libraries/LibWeb/Layout/SVGSVGBox.cpp
index 23dde716a4..af4a038dbc 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGSVG.cpp
+++ b/Libraries/LibWeb/Layout/SVGSVGBox.cpp
@@ -24,16 +24,16 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <LibWeb/Layout/LayoutSVGSVG.h>
+#include <LibWeb/Layout/SVGSVGBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutSVGSVG::LayoutSVGSVG(DOM::Document& document, SVG::SVGSVGElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
-    : LayoutSVGGraphics(document, element, properties)
+SVGSVGBox::SVGSVGBox(DOM::Document& document, SVG::SVGSVGElement& element, NonnullRefPtr<CSS::StyleProperties> properties)
+    : SVGGraphicsBox(document, element, properties)
 {
 }
 
-void LayoutSVGSVG::prepare_for_replaced_layout()
+void SVGSVGBox::prepare_for_replaced_layout()
 {
     set_has_intrinsic_width(true);
     set_has_intrinsic_height(true);
@@ -41,21 +41,21 @@ void LayoutSVGSVG::prepare_for_replaced_layout()
     set_intrinsic_height(dom_node().height());
 }
 
-void LayoutSVGSVG::before_children_paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGSVGBox::before_children_paint(PaintContext& context, PaintPhase phase)
 {
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    if (phase != PaintPhase::Foreground)
         return;
 
     if (!context.has_svg_context())
         context.set_svg_context(SVGContext());
 
-    LayoutSVGGraphics::before_children_paint(context, phase);
+    SVGGraphicsBox::before_children_paint(context, phase);
 }
 
-void LayoutSVGSVG::after_children_paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void SVGSVGBox::after_children_paint(PaintContext& context, PaintPhase phase)
 {
-    LayoutSVGGraphics::after_children_paint(context, phase);
-    if (phase != LayoutNode::PaintPhase::Foreground)
+    SVGGraphicsBox::after_children_paint(context, phase);
+    if (phase != PaintPhase::Foreground)
         return;
 }
 
diff --git a/Libraries/LibWeb/Layout/LayoutSVGSVG.h b/Libraries/LibWeb/Layout/SVGSVGBox.h
index 01fb4ea8be..a03d28d289 100644
--- a/Libraries/LibWeb/Layout/LayoutSVGSVG.h
+++ b/Libraries/LibWeb/Layout/SVGSVGBox.h
@@ -26,25 +26,25 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutSVGGraphics.h>
+#include <LibWeb/Layout/SVGGraphicsBox.h>
 #include <LibWeb/SVG/SVGSVGElement.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutSVGSVG final : public LayoutSVGGraphics {
+class SVGSVGBox final : public SVGGraphicsBox {
 public:
-    LayoutSVGSVG(DOM::Document&, SVG::SVGSVGElement&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutSVGSVG() override = default;
+    SVGSVGBox(DOM::Document&, SVG::SVGSVGElement&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~SVGSVGBox() override = default;
 
-    SVG::SVGSVGElement& dom_node() { return downcast<SVG::SVGSVGElement>(LayoutSVGGraphics::dom_node()); }
+    SVG::SVGSVGElement& dom_node() { return downcast<SVG::SVGSVGElement>(SVGGraphicsBox::dom_node()); }
 
     virtual void prepare_for_replaced_layout() override;
 
-    virtual void before_children_paint(PaintContext& context, LayoutNode::PaintPhase phase) override;
+    virtual void before_children_paint(PaintContext& context, PaintPhase phase) override;
     virtual void after_children_paint(PaintContext& context, PaintPhase phase) override;
 
 private:
-    const char* class_name() const override { return "LayoutSVGSVG"; }
+    const char* class_name() const override { return "SVGSVGBox"; }
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutTableRow.cpp b/Libraries/LibWeb/Layout/TableBox.cpp
index a94e522c47..139a2d7011 100644
--- a/Libraries/LibWeb/Layout/LayoutTableRow.cpp
+++ b/Libraries/LibWeb/Layout/TableBox.cpp
@@ -25,18 +25,16 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutTable.h>
-#include <LibWeb/Layout/LayoutTableCell.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
+#include <LibWeb/Layout/TableBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutTableRow::LayoutTableRow(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBox(document, &element, move(style))
+TableBox::TableBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Layout::BlockBox(document, &element, move(style))
 {
 }
 
-LayoutTableRow::~LayoutTableRow()
+TableBox::~TableBox()
 {
 }
 
diff --git a/Libraries/LibWeb/Layout/LayoutTable.h b/Libraries/LibWeb/Layout/TableBox.h
index b94874a0b1..a407980541 100644
--- a/Libraries/LibWeb/Layout/LayoutTable.h
+++ b/Libraries/LibWeb/Layout/TableBox.h
@@ -26,22 +26,22 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/BlockBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutTable final : public LayoutBlock {
+class TableBox final : public Layout::BlockBox {
 public:
-    LayoutTable(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutTable() override;
+    TableBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~TableBox() override;
 
 private:
     virtual bool is_table() const override { return true; }
-    virtual const char* class_name() const override { return "LayoutTable"; }
+    virtual const char* class_name() const override { return "TableBox"; }
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutTable)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_table(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::TableBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_table(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutTableCell.cpp b/Libraries/LibWeb/Layout/TableCellBox.cpp
index 27c9a2780d..b5edb41121 100644
--- a/Libraries/LibWeb/Layout/LayoutTableCell.cpp
+++ b/Libraries/LibWeb/Layout/TableCellBox.cpp
@@ -25,29 +25,29 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutTableCell.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
+#include <LibWeb/Layout/TableCellBox.h>
+#include <LibWeb/Layout/TableRowBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutTableCell::LayoutTableCell(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBlock(document, &element, move(style))
+TableCellBox::TableCellBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Layout::BlockBox(document, &element, move(style))
 {
 }
 
-LayoutTableCell::~LayoutTableCell()
+TableCellBox::~TableCellBox()
 {
 }
 
-size_t LayoutTableCell::colspan() const
+size_t TableCellBox::colspan() const
 {
     ASSERT(dom_node());
     return downcast<DOM::Element>(*dom_node()).attribute(HTML::AttributeNames::colspan).to_uint().value_or(1);
 }
 
-float LayoutTableCell::width_of_logical_containing_block() const
+float TableCellBox::width_of_logical_containing_block() const
 {
-    if (auto* row = first_ancestor_of_type<LayoutTableRow>())
+    if (auto* row = first_ancestor_of_type<TableRowBox>())
         return row->width();
     return 0;
 }
diff --git a/Libraries/LibWeb/Layout/LayoutTableCell.h b/Libraries/LibWeb/Layout/TableCellBox.h
index 5ce5dc7462..e8eba520e3 100644
--- a/Libraries/LibWeb/Layout/LayoutTableCell.h
+++ b/Libraries/LibWeb/Layout/TableCellBox.h
@@ -26,28 +26,28 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/BlockBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutTableCell final : public LayoutBlock {
+class TableCellBox final : public BlockBox {
 public:
-    LayoutTableCell(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutTableCell() override;
+    TableCellBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~TableCellBox() override;
 
-    LayoutTableCell* next_cell() { return next_sibling_of_type<LayoutTableCell>(); }
-    const LayoutTableCell* next_cell() const { return next_sibling_of_type<LayoutTableCell>(); }
+    TableCellBox* next_cell() { return next_sibling_of_type<TableCellBox>(); }
+    const TableCellBox* next_cell() const { return next_sibling_of_type<TableCellBox>(); }
 
     size_t colspan() const;
 
 private:
     virtual bool is_table_cell() const override { return true; }
-    virtual const char* class_name() const override { return "LayoutTableCell"; }
+    virtual const char* class_name() const override { return "TableCellBox"; }
     virtual float width_of_logical_containing_block() const override;
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutTableCell)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_table_cell(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::TableCellBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_table_cell(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/TableFormattingContext.cpp b/Libraries/LibWeb/Layout/TableFormattingContext.cpp
index a23d301d19..71f85eb0ad 100644
--- a/Libraries/LibWeb/Layout/TableFormattingContext.cpp
+++ b/Libraries/LibWeb/Layout/TableFormattingContext.cpp
@@ -26,19 +26,19 @@
 
 #include <LibWeb/CSS/Length.h>
 #include <LibWeb/DOM/Node.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/Box.h>
 #include <LibWeb/Layout/InlineFormattingContext.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutBox.h>
-#include <LibWeb/Layout/LayoutTable.h>
-#include <LibWeb/Layout/LayoutTableCell.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
-#include <LibWeb/Layout/LayoutTableRowGroup.h>
+#include <LibWeb/Layout/TableBox.h>
+#include <LibWeb/Layout/TableCellBox.h>
 #include <LibWeb/Layout/TableFormattingContext.h>
+#include <LibWeb/Layout/TableRowBox.h>
+#include <LibWeb/Layout/TableRowGroupBox.h>
 #include <LibWeb/Page/Frame.h>
 
 namespace Web::Layout {
 
-TableFormattingContext::TableFormattingContext(LayoutBox& context_box)
+TableFormattingContext::TableFormattingContext(Box& context_box)
     : BlockFormattingContext(context_box)
 {
 }
@@ -51,19 +51,19 @@ void TableFormattingContext::run(LayoutMode)
 {
     compute_width(context_box());
 
-    context_box().for_each_child_of_type<LayoutTableRowGroup>([&](auto& box) {
+    context_box().for_each_child_of_type<TableRowGroupBox>([&](auto& box) {
         compute_width(box);
         auto column_count = box.column_count();
         Vector<float> column_widths;
         column_widths.resize(column_count);
 
-        box.template for_each_child_of_type<LayoutTableRow>([&](auto& row) {
+        box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
             calculate_column_widths(row, column_widths);
         });
 
         float content_height = 0;
 
-        box.template for_each_child_of_type<LayoutTableRow>([&](auto& row) {
+        box.template for_each_child_of_type<TableRowBox>([&](auto& row) {
             row.set_offset(0, content_height);
             layout_row(row, column_widths);
             content_height += row.height();
@@ -75,12 +75,12 @@ void TableFormattingContext::run(LayoutMode)
     compute_height(context_box());
 }
 
-void TableFormattingContext::calculate_column_widths(LayoutBox& row, Vector<float>& column_widths)
+void TableFormattingContext::calculate_column_widths(Box& row, Vector<float>& column_widths)
 {
     size_t column_index = 0;
-    auto* table = row.first_ancestor_of_type<LayoutTable>();
+    auto* table = row.first_ancestor_of_type<TableBox>();
     bool use_auto_layout = !table || table->style().width().is_undefined_or_auto();
-    row.for_each_child_of_type<LayoutTableCell>([&](auto& cell) {
+    row.for_each_child_of_type<TableCellBox>([&](auto& cell) {
         compute_width(cell);
         if (use_auto_layout) {
             layout_inside(cell, LayoutMode::OnlyRequiredLineBreaks);
@@ -92,15 +92,15 @@ void TableFormattingContext::calculate_column_widths(LayoutBox& row, Vector<floa
     });
 }
 
-void TableFormattingContext::layout_row(LayoutBox& row, Vector<float>& column_widths)
+void TableFormattingContext::layout_row(Box& row, Vector<float>& column_widths)
 {
     size_t column_index = 0;
     float tallest_cell_height = 0;
     float content_width = 0;
-    auto* table = row.first_ancestor_of_type<LayoutTable>();
+    auto* table = row.first_ancestor_of_type<TableBox>();
     bool use_auto_layout = !table || table->style().width().is_undefined_or_auto();
 
-    row.for_each_child_of_type<LayoutTableCell>([&](auto& cell) {
+    row.for_each_child_of_type<TableCellBox>([&](auto& cell) {
         cell.set_offset(row.effective_offset().translated(content_width, 0));
 
         // Layout the cell contents a second time, now that we know its final width.
diff --git a/Libraries/LibWeb/Layout/TableFormattingContext.h b/Libraries/LibWeb/Layout/TableFormattingContext.h
index 5ab4db75eb..f5a5cda164 100644
--- a/Libraries/LibWeb/Layout/TableFormattingContext.h
+++ b/Libraries/LibWeb/Layout/TableFormattingContext.h
@@ -33,14 +33,14 @@ namespace Web::Layout {
 
 class TableFormattingContext final : public BlockFormattingContext {
 public:
-    explicit TableFormattingContext(LayoutBox& containing_block);
+    explicit TableFormattingContext(Box& containing_block);
     ~TableFormattingContext();
 
     virtual void run(LayoutMode) override;
 
 private:
-    void calculate_column_widths(LayoutBox& row, Vector<float>& column_widths);
-    void layout_row(LayoutBox& row, Vector<float>& column_widths);
+    void calculate_column_widths(Box& row, Vector<float>& column_widths);
+    void layout_row(Box& row, Vector<float>& column_widths);
 };
 
 }
diff --git a/Libraries/LibWeb/Layout/LayoutTable.cpp b/Libraries/LibWeb/Layout/TableRowBox.cpp
index 721aa7daa9..0bed4d507b 100644
--- a/Libraries/LibWeb/Layout/LayoutTable.cpp
+++ b/Libraries/LibWeb/Layout/TableRowBox.cpp
@@ -25,17 +25,16 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutTable.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
+#include <LibWeb/Layout/TableRowBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutTable::LayoutTable(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBlock(document, &element, move(style))
+TableRowBox::TableRowBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Box(document, &element, move(style))
 {
 }
 
-LayoutTable::~LayoutTable()
+TableRowBox::~TableRowBox()
 {
 }
 
diff --git a/Libraries/LibWeb/Layout/LayoutTableRow.h b/Libraries/LibWeb/Layout/TableRowBox.h
index a1855abe32..5870789d95 100644
--- a/Libraries/LibWeb/Layout/LayoutTableRow.h
+++ b/Libraries/LibWeb/Layout/TableRowBox.h
@@ -26,24 +26,22 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBox.h>
+#include <LibWeb/Layout/Box.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutTableCell;
-
-class LayoutTableRow final : public LayoutBox {
+class TableRowBox final : public Box {
 public:
-    LayoutTableRow(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutTableRow() override;
+    TableRowBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~TableRowBox() override;
 
 private:
     virtual bool is_table_row() const override { return true; }
-    virtual const char* class_name() const override { return "LayoutTableRow"; }
+    virtual const char* class_name() const override { return "TableRowBox"; }
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutTableRow)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_table_row(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::TableRowBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_table_row(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutTableRowGroup.cpp b/Libraries/LibWeb/Layout/TableRowGroupBox.cpp
index c35b775634..f6ced13a33 100644
--- a/Libraries/LibWeb/Layout/LayoutTableRowGroup.cpp
+++ b/Libraries/LibWeb/Layout/TableRowGroupBox.cpp
@@ -25,27 +25,27 @@
  */
 
 #include <LibWeb/DOM/Element.h>
-#include <LibWeb/Layout/LayoutTableCell.h>
-#include <LibWeb/Layout/LayoutTableRow.h>
-#include <LibWeb/Layout/LayoutTableRowGroup.h>
+#include <LibWeb/Layout/TableCellBox.h>
+#include <LibWeb/Layout/TableRowBox.h>
+#include <LibWeb/Layout/TableRowGroupBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutTableRowGroup::LayoutTableRowGroup(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
-    : LayoutBlock(document, &element, move(style))
+TableRowGroupBox::TableRowGroupBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
+    : Layout::BlockBox(document, &element, move(style))
 {
 }
 
-LayoutTableRowGroup::~LayoutTableRowGroup()
+TableRowGroupBox::~TableRowGroupBox()
 {
 }
 
-size_t LayoutTableRowGroup::column_count() const
+size_t TableRowGroupBox::column_count() const
 {
     size_t table_column_count = 0;
-    for_each_child_of_type<LayoutTableRow>([&](auto& row) {
+    for_each_child_of_type<TableRowBox>([&](auto& row) {
         size_t row_column_count = 0;
-        row.template for_each_child_of_type<LayoutTableCell>([&](auto& cell) {
+        row.template for_each_child_of_type<TableCellBox>([&](auto& cell) {
             row_column_count += cell.colspan();
         });
         table_column_count = max(table_column_count, row_column_count);
diff --git a/Libraries/LibWeb/Layout/LayoutTableRowGroup.h b/Libraries/LibWeb/Layout/TableRowGroupBox.h
index a07ced75cb..c887c77083 100644
--- a/Libraries/LibWeb/Layout/LayoutTableRowGroup.h
+++ b/Libraries/LibWeb/Layout/TableRowGroupBox.h
@@ -26,24 +26,24 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/BlockBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutTableRowGroup final : public LayoutBlock {
+class TableRowGroupBox final : public BlockBox {
 public:
-    LayoutTableRowGroup(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
-    virtual ~LayoutTableRowGroup() override;
+    TableRowGroupBox(DOM::Document&, DOM::Element&, NonnullRefPtr<CSS::StyleProperties>);
+    virtual ~TableRowGroupBox() override;
 
     size_t column_count() const;
 
 private:
     virtual bool is_table_row_group() const override { return true; }
-    virtual const char* class_name() const override { return "LayoutTableRowGroup"; }
+    virtual const char* class_name() const override { return "TableRowGroupBox"; }
 };
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutTableRowGroup)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_table_row_group(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::TableRowGroupBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_table_row_group(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutText.cpp b/Libraries/LibWeb/Layout/TextNode.cpp
index b6d8e2b001..4030d40aa1 100644
--- a/Libraries/LibWeb/Layout/LayoutText.cpp
+++ b/Libraries/LibWeb/Layout/TextNode.cpp
@@ -30,20 +30,20 @@
 #include <LibGUI/Painter.h>
 #include <LibGfx/Font.h>
 #include <LibWeb/DOM/Document.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/BlockBox.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <LibWeb/Page/Frame.h>
 #include <ctype.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutText::LayoutText(DOM::Document& document, DOM::Text& text)
-    : LayoutNode(document, &text)
+TextNode::TextNode(DOM::Document& document, DOM::Text& text)
+    : Node(document, &text)
 {
     set_inline(true);
 }
 
-LayoutText::~LayoutText()
+TextNode::~TextNode()
 {
 }
 
@@ -56,7 +56,7 @@ static bool is_all_whitespace(const StringView& string)
     return true;
 }
 
-const String& LayoutText::text_for_style(const CSS::StyleProperties& style) const
+const String& TextNode::text_for_style(const CSS::StyleProperties& style) const
 {
     static String one_space = " ";
     if (is_all_whitespace(dom_node().data())) {
@@ -66,7 +66,7 @@ const String& LayoutText::text_for_style(const CSS::StyleProperties& style) cons
     return dom_node().data();
 }
 
-void LayoutText::paint_fragment(PaintContext& context, const LineBoxFragment& fragment) const
+void TextNode::paint_fragment(PaintContext& context, const LineBoxFragment& fragment) const
 {
     auto& painter = context.painter();
     painter.set_font(specified_style().font());
@@ -106,7 +106,7 @@ void LayoutText::paint_fragment(PaintContext& context, const LineBoxFragment& fr
     paint_cursor_if_needed(context, fragment);
 }
 
-void LayoutText::paint_cursor_if_needed(PaintContext& context, const LineBoxFragment& fragment) const
+void TextNode::paint_cursor_if_needed(PaintContext& context, const LineBoxFragment& fragment) const
 {
     if (!frame().is_focused_frame())
         return;
@@ -133,7 +133,7 @@ void LayoutText::paint_cursor_if_needed(PaintContext& context, const LineBoxFrag
 }
 
 template<typename Callback>
-void LayoutText::for_each_chunk(Callback callback, LayoutMode layout_mode, bool do_wrap_lines, bool do_wrap_breaks) const
+void TextNode::for_each_chunk(Callback callback, LayoutMode layout_mode, bool do_wrap_lines, bool do_wrap_breaks) const
 {
     Utf8View view(m_text_for_rendering);
     if (view.is_empty())
@@ -185,7 +185,7 @@ void LayoutText::for_each_chunk(Callback callback, LayoutMode layout_mode, bool
         commit_chunk(view.end(), false, true);
 }
 
-void LayoutText::split_into_lines_by_rules(LayoutBlock& container, LayoutMode layout_mode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks)
+void TextNode::split_into_lines_by_rules(BlockBox& container, LayoutMode layout_mode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks)
 {
     auto& font = specified_style().font();
     float space_width = font.glyph_width(' ') + font.glyph_spacing();
@@ -285,7 +285,7 @@ void LayoutText::split_into_lines_by_rules(LayoutBlock& container, LayoutMode la
     }
 }
 
-void LayoutText::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
+void TextNode::split_into_lines(BlockBox& container, LayoutMode layout_mode)
 {
     bool do_collapse = true;
     bool do_wrap_lines = true;
diff --git a/Libraries/LibWeb/Layout/LayoutText.h b/Libraries/LibWeb/Layout/TextNode.h
index 4b30426b84..cf15d391fe 100644
--- a/Libraries/LibWeb/Layout/LayoutText.h
+++ b/Libraries/LibWeb/Layout/TextNode.h
@@ -27,33 +27,33 @@
 #pragma once
 
 #include <LibWeb/DOM/Text.h>
-#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Layout/Node.h>
 
-namespace Web {
+namespace Web::Layout {
 
 class LineBoxFragment;
 
-class LayoutText : public LayoutNode {
+class TextNode : public Node {
 public:
-    LayoutText(DOM::Document&, DOM::Text&);
-    virtual ~LayoutText() override;
+    TextNode(DOM::Document&, DOM::Text&);
+    virtual ~TextNode() override;
 
-    const DOM::Text& dom_node() const { return static_cast<const DOM::Text&>(*LayoutNode::dom_node()); }
+    const DOM::Text& dom_node() const { return static_cast<const DOM::Text&>(*Node::dom_node()); }
 
     const String& text_for_style(const CSS::StyleProperties&) const;
     const String& text_for_rendering() const { return m_text_for_rendering; }
 
-    virtual const char* class_name() const override { return "LayoutText"; }
+    virtual const char* class_name() const override { return "TextNode"; }
     virtual bool is_text() const final { return true; }
 
     void paint_fragment(PaintContext&, const LineBoxFragment&) const;
 
-    virtual void split_into_lines(LayoutBlock& container, LayoutMode) override;
+    virtual void split_into_lines(BlockBox& container, LayoutMode) override;
 
     const CSS::StyleProperties& specified_style() const { return parent()->specified_style(); }
 
 private:
-    void split_into_lines_by_rules(LayoutBlock& container, LayoutMode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks);
+    void split_into_lines_by_rules(BlockBox& container, LayoutMode, bool do_collapse, bool do_wrap_lines, bool do_wrap_breaks);
     void paint_cursor_if_needed(PaintContext&, const LineBoxFragment&) const;
 
     template<typename Callback>
@@ -64,6 +64,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutText)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_text(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::TextNode)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_text(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/Layout/LayoutWidget.cpp b/Libraries/LibWeb/Layout/WidgetBox.cpp
index a80394a8a9..c38aa50765 100644
--- a/Libraries/LibWeb/Layout/LayoutWidget.cpp
+++ b/Libraries/LibWeb/Layout/WidgetBox.cpp
@@ -31,13 +31,13 @@
 #include <LibGfx/StylePainter.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <LibWeb/Page/Frame.h>
 
-namespace Web {
+namespace Web::Layout {
 
-LayoutWidget::LayoutWidget(DOM::Document& document, DOM::Element& element, GUI::Widget& widget)
-    : LayoutReplaced(document, element, CSS::StyleProperties::create())
+WidgetBox::WidgetBox(DOM::Document& document, DOM::Element& element, GUI::Widget& widget)
+    : ReplacedBox(document, element, CSS::StyleProperties::create())
     , m_widget(widget)
 {
     set_has_intrinsic_width(true);
@@ -46,18 +46,18 @@ LayoutWidget::LayoutWidget(DOM::Document& document, DOM::Element& element, GUI::
     set_intrinsic_height(widget.height());
 }
 
-LayoutWidget::~LayoutWidget()
+WidgetBox::~WidgetBox()
 {
     widget().remove_from_parent();
 }
 
-void LayoutWidget::did_set_rect()
+void WidgetBox::did_set_rect()
 {
-    LayoutReplaced::did_set_rect();
+    ReplacedBox::did_set_rect();
     update_widget();
 }
 
-void LayoutWidget::update_widget()
+void WidgetBox::update_widget()
 {
     auto adjusted_widget_position = absolute_rect().location().to_type<int>();
     auto& page_view = static_cast<const InProcessWebView&>(frame().page()->client());
diff --git a/Libraries/LibWeb/Layout/LayoutWidget.h b/Libraries/LibWeb/Layout/WidgetBox.h
index 90051f9810..0c5f734cd2 100644
--- a/Libraries/LibWeb/Layout/LayoutWidget.h
+++ b/Libraries/LibWeb/Layout/WidgetBox.h
@@ -26,14 +26,14 @@
 
 #pragma once
 
-#include <LibWeb/Layout/LayoutReplaced.h>
+#include <LibWeb/Layout/ReplacedBox.h>
 
-namespace Web {
+namespace Web::Layout {
 
-class LayoutWidget final : public LayoutReplaced {
+class WidgetBox final : public ReplacedBox {
 public:
-    LayoutWidget(DOM::Document&, DOM::Element&, GUI::Widget&);
-    virtual ~LayoutWidget() override;
+    WidgetBox(DOM::Document&, DOM::Element&, GUI::Widget&);
+    virtual ~WidgetBox() override;
 
     GUI::Widget& widget() { return m_widget; }
     const GUI::Widget& widget() const { return m_widget; }
@@ -43,7 +43,7 @@ public:
     void update_widget();
 
 private:
-    virtual const char* class_name() const override { return "LayoutWidget"; }
+    virtual const char* class_name() const override { return "WidgetBox"; }
 
     virtual void did_set_rect() override;
 
@@ -52,6 +52,6 @@ private:
 
 }
 
-AK_BEGIN_TYPE_TRAITS(Web::LayoutWidget)
-static bool is_type(const Web::LayoutNode& layout_node) { return layout_node.is_widget(); }
+AK_BEGIN_TYPE_TRAITS(Web::Layout::WidgetBox)
+static bool is_type(const Web::Layout::Node& layout_node) { return layout_node.is_widget(); }
 AK_END_TYPE_TRAITS()
diff --git a/Libraries/LibWeb/LayoutTreeModel.cpp b/Libraries/LibWeb/LayoutTreeModel.cpp
index cbfb583109..7ee9eced5e 100644
--- a/Libraries/LibWeb/LayoutTreeModel.cpp
+++ b/Libraries/LibWeb/LayoutTreeModel.cpp
@@ -29,7 +29,7 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Element.h>
 #include <LibWeb/DOM/Text.h>
-#include <LibWeb/Layout/LayoutText.h>
+#include <LibWeb/Layout/TextNode.h>
 #include <ctype.h>
 #include <stdio.h>
 
@@ -51,7 +51,7 @@ GUI::ModelIndex LayoutTreeModel::index(int row, int column, const GUI::ModelInde
 {
     if (!parent.is_valid())
         return create_index(row, column, m_document->layout_node());
-    auto& parent_node = *static_cast<LayoutNode*>(parent.internal_data());
+    auto& parent_node = *static_cast<Layout::Node*>(parent.internal_data());
     return create_index(row, column, parent_node.child_at_index(row));
 }
 
@@ -59,7 +59,7 @@ GUI::ModelIndex LayoutTreeModel::parent_index(const GUI::ModelIndex& index) cons
 {
     if (!index.is_valid())
         return {};
-    auto& node = *static_cast<LayoutNode*>(index.internal_data());
+    auto& node = *static_cast<Layout::Node*>(index.internal_data());
     if (!node.parent())
         return {};
 
@@ -85,7 +85,7 @@ int LayoutTreeModel::row_count(const GUI::ModelIndex& index) const
 {
     if (!index.is_valid())
         return 1;
-    auto& node = *static_cast<LayoutNode*>(index.internal_data());
+    auto& node = *static_cast<Layout::Node*>(index.internal_data());
     return node.child_count();
 }
 
@@ -117,7 +117,7 @@ static String with_whitespace_collapsed(const StringView& string)
 
 GUI::Variant LayoutTreeModel::data(const GUI::ModelIndex& index, GUI::ModelRole role) const
 {
-    auto& node = *static_cast<LayoutNode*>(index.internal_data());
+    auto& node = *static_cast<Layout::Node*>(index.internal_data());
     if (role == GUI::ModelRole::Icon) {
         if (node.is_root())
             return m_document_icon;
@@ -127,7 +127,7 @@ GUI::Variant LayoutTreeModel::data(const GUI::ModelIndex& index, GUI::ModelRole
     }
     if (role == GUI::ModelRole::Display) {
         if (node.is_text())
-            return String::format("LayoutText: %s", with_whitespace_collapsed(downcast<LayoutText>(node).text_for_rendering()).characters());
+            return String::format("TextNode: %s", with_whitespace_collapsed(downcast<Layout::TextNode>(node).text_for_rendering()).characters());
         StringBuilder builder;
         builder.append(node.class_name());
         builder.append(' ');
diff --git a/Libraries/LibWeb/Page/EventHandler.cpp b/Libraries/LibWeb/Page/EventHandler.cpp
index 3d0e4ed85f..e7e310ab31 100644
--- a/Libraries/LibWeb/Page/EventHandler.cpp
+++ b/Libraries/LibWeb/Page/EventHandler.cpp
@@ -33,14 +33,14 @@
 #include <LibWeb/HTML/HTMLIFrameElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Page/EventHandler.h>
 #include <LibWeb/Page/Frame.h>
 #include <LibWeb/UIEvents/MouseEvent.h>
 
 namespace Web {
 
-static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, const LayoutNode& layout_node)
+static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& position, const Layout::Node& layout_node)
 {
     auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
     return {
@@ -58,14 +58,14 @@ EventHandler::~EventHandler()
 {
 }
 
-const LayoutDocument* EventHandler::layout_root() const
+const Layout::InitialContainingBlockBox* EventHandler::layout_root() const
 {
     if (!m_frame.document())
         return nullptr;
     return m_frame.document()->layout_node();
 }
 
-LayoutDocument* EventHandler::layout_root()
+Layout::InitialContainingBlockBox* EventHandler::layout_root()
 {
     if (!m_frame.document())
         return nullptr;
@@ -84,15 +84,15 @@ bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button
 
     bool handled_event = false;
 
-    auto result = layout_root()->hit_test(position, HitTestType::Exact);
+    auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
 
     if (result.layout_node && result.layout_node->wants_mouse_events()) {
         result.layout_node->handle_mouseup({}, position, button, modifiers);
 
-        // Things may have changed as a consequence of LayoutNode::handle_mouseup(). Hit test again.
+        // Things may have changed as a consequence of Layout::Node::handle_mouseup(). Hit test again.
         if (!layout_root())
             return true;
-        result = layout_root()->hit_test(position, HitTestType::Exact);
+        result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
     }
 
     if (result.layout_node && result.layout_node->dom_node()) {
@@ -126,7 +126,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
 
     NonnullRefPtr document = *m_frame.document();
 
-    auto result = layout_root()->hit_test(position, HitTestType::Exact);
+    auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
     if (!result.layout_node)
         return false;
 
@@ -193,7 +193,7 @@ bool EventHandler::handle_mousedown(const Gfx::IntPoint& position, unsigned butt
         }
     } else {
         if (button == GUI::MouseButton::Left) {
-            auto result = layout_root()->hit_test(position, HitTestType::TextCursor);
+            auto result = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
             if (result.layout_node && result.layout_node->dom_node()) {
                 m_frame.set_cursor_position(DOM::Position(*node, result.index_in_node));
                 layout_root()->set_selection({ { result.layout_node, result.index_in_node }, {} });
@@ -223,7 +223,7 @@ bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned butt
     bool hovered_node_changed = false;
     bool is_hovering_link = false;
     bool is_hovering_text = false;
-    auto result = layout_root()->hit_test(position, HitTestType::Exact);
+    auto result = layout_root()->hit_test(position, Layout::HitTestType::Exact);
     const HTML::HTMLAnchorElement* hovered_link_element = nullptr;
     if (result.layout_node) {
 
@@ -258,7 +258,7 @@ bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned butt
                 return true;
         }
         if (m_in_mouse_selection) {
-            auto hit = layout_root()->hit_test(position, HitTestType::TextCursor);
+            auto hit = layout_root()->hit_test(position, Layout::HitTestType::TextCursor);
             if (hit.layout_node && hit.layout_node->dom_node()) {
                 layout_root()->set_selection_end({ hit.layout_node, hit.index_in_node });
             }
@@ -368,7 +368,7 @@ bool EventHandler::handle_keydown(KeyCode key, unsigned modifiers, u32 code_poin
     return false;
 }
 
-void EventHandler::set_mouse_event_tracking_layout_node(LayoutNode* layout_node)
+void EventHandler::set_mouse_event_tracking_layout_node(Layout::Node* layout_node)
 {
     if (layout_node)
         m_mouse_event_tracking_layout_node = layout_node->make_weak_ptr();
diff --git a/Libraries/LibWeb/Page/EventHandler.h b/Libraries/LibWeb/Page/EventHandler.h
index e077a71ded..65acfbdbe1 100644
--- a/Libraries/LibWeb/Page/EventHandler.h
+++ b/Libraries/LibWeb/Page/EventHandler.h
@@ -48,14 +48,14 @@ public:
 
     bool handle_keydown(KeyCode, unsigned modifiers, u32 code_point);
 
-    void set_mouse_event_tracking_layout_node(LayoutNode*);
+    void set_mouse_event_tracking_layout_node(Layout::Node*);
 
 private:
     bool focus_next_element();
     bool focus_previous_element();
 
-    LayoutDocument* layout_root();
-    const LayoutDocument* layout_root() const;
+    Layout::InitialContainingBlockBox* layout_root();
+    const Layout::InitialContainingBlockBox* layout_root() const;
 
     void dump_selection(const char* event_name) const;
 
@@ -63,7 +63,7 @@ private:
 
     bool m_in_mouse_selection { false };
 
-    WeakPtr<LayoutNode> m_mouse_event_tracking_layout_node;
+    WeakPtr<Layout::Node> m_mouse_event_tracking_layout_node;
 };
 
 }
diff --git a/Libraries/LibWeb/Page/Frame.cpp b/Libraries/LibWeb/Page/Frame.cpp
index f7b5a7ed78..c9e0a3e6cd 100644
--- a/Libraries/LibWeb/Page/Frame.cpp
+++ b/Libraries/LibWeb/Page/Frame.cpp
@@ -27,10 +27,10 @@
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLAnchorElement.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Layout/LayoutBreak.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutText.h>
-#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Layout/BreakNode.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
+#include <LibWeb/Layout/TextNode.h>
+#include <LibWeb/Layout/WidgetBox.h>
 #include <LibWeb/Page/Frame.h>
 
 namespace Web {
@@ -137,7 +137,7 @@ void Frame::did_scroll(Badge<InProcessWebView>)
         return;
     if (!m_document->layout_node())
         return;
-    m_document->layout_node()->for_each_in_subtree_of_type<LayoutWidget>([&](auto& layout_widget) {
+    m_document->layout_node()->for_each_in_subtree_of_type<Layout::WidgetBox>([&](auto& layout_widget) {
         layout_widget.update_widget();
         return IterationDecision::Continue;
     });
@@ -165,8 +165,8 @@ void Frame::scroll_to_anchor(const String& 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() } };
-    if (is<LayoutBox>(layout_node)) {
-        auto& layout_box = downcast<LayoutBox>(layout_node);
+    if (is<Layout::Box>(layout_node)) {
+        auto& layout_box = downcast<Layout::Box>(layout_node);
         auto padding_box = layout_box.box_model().padding_box(layout_box);
         float_rect.move_by(-padding_box.left, -padding_box.top);
     }
@@ -227,24 +227,24 @@ String Frame::selected_text() const
     auto selection = layout_root->selection().normalized();
 
     if (selection.start().layout_node == selection.end().layout_node) {
-        if (!is<LayoutText>(*selection.start().layout_node))
+        if (!is<Layout::TextNode>(*selection.start().layout_node))
             return "";
-        return downcast<LayoutText>(*selection.start().layout_node).text_for_rendering().substring(selection.start().index_in_node, selection.end().index_in_node - selection.start().index_in_node);
+        return downcast<Layout::TextNode>(*selection.start().layout_node).text_for_rendering().substring(selection.start().index_in_node, selection.end().index_in_node - selection.start().index_in_node);
     }
 
     // Start node
     auto layout_node = selection.start().layout_node;
-    if (is<LayoutText>(*layout_node)) {
-        auto& text = downcast<LayoutText>(*layout_node).text_for_rendering();
+    if (is<Layout::TextNode>(*layout_node)) {
+        auto& text = downcast<Layout::TextNode>(*layout_node).text_for_rendering();
         builder.append(text.substring(selection.start().index_in_node, text.length() - selection.start().index_in_node));
     }
 
     // Middle nodes
     layout_node = layout_node->next_in_pre_order();
     while (layout_node && layout_node != selection.end().layout_node) {
-        if (is<LayoutText>(*layout_node))
-            builder.append(downcast<LayoutText>(*layout_node).text_for_rendering());
-        else if (is<LayoutBreak>(*layout_node) || is<LayoutBlock>(*layout_node))
+        if (is<Layout::TextNode>(*layout_node))
+            builder.append(downcast<Layout::TextNode>(*layout_node).text_for_rendering());
+        else if (is<Layout::BreakNode>(*layout_node) || is<Layout::BlockBox>(*layout_node))
             builder.append('\n');
 
         layout_node = layout_node->next_in_pre_order();
@@ -252,8 +252,8 @@ String Frame::selected_text() const
 
     // End node
     ASSERT(layout_node == selection.end().layout_node);
-    if (is<LayoutText>(*layout_node)) {
-        auto& text = downcast<LayoutText>(*layout_node).text_for_rendering();
+    if (is<Layout::TextNode>(*layout_node)) {
+        auto& text = downcast<Layout::TextNode>(*layout_node).text_for_rendering();
         builder.append(text.substring(0, selection.end().index_in_node));
     }
 
diff --git a/Libraries/LibWeb/Painting/StackingContext.cpp b/Libraries/LibWeb/Painting/StackingContext.cpp
index 4d27abacd8..daca00c597 100644
--- a/Libraries/LibWeb/Painting/StackingContext.cpp
+++ b/Libraries/LibWeb/Painting/StackingContext.cpp
@@ -26,13 +26,13 @@
 
 #include <AK/QuickSort.h>
 #include <LibWeb/DOM/Node.h>
-#include <LibWeb/Layout/LayoutBox.h>
-#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Layout/Box.h>
+#include <LibWeb/Layout/InitialContainingBlockBox.h>
 #include <LibWeb/Painting/StackingContext.h>
 
-namespace Web {
+namespace Web::Layout {
 
-StackingContext::StackingContext(LayoutBox& box, StackingContext* parent)
+StackingContext::StackingContext(Box& box, StackingContext* parent)
     : m_box(box)
     , m_parent(parent)
 {
@@ -47,14 +47,14 @@ StackingContext::StackingContext(LayoutBox& box, StackingContext* parent)
     }
 }
 
-void StackingContext::paint(PaintContext& context, LayoutNode::PaintPhase phase)
+void StackingContext::paint(PaintContext& context, Node::PaintPhase phase)
 {
     if (!m_box.is_root()) {
         m_box.paint(context, phase);
     } else {
-        // NOTE: LayoutDocument::paint() merely calls StackingContext::paint()
+        // NOTE: InitialContainingBlockBox::paint() merely calls StackingContext::paint()
         //       so we call its base class instead.
-        downcast<LayoutDocument>(m_box).LayoutBlock::paint(context, phase);
+        downcast<InitialContainingBlockBox>(m_box).BlockBox::paint(context, phase);
     }
     for (auto* child : m_children) {
         child->paint(context, phase);
@@ -67,9 +67,9 @@ HitTestResult StackingContext::hit_test(const Gfx::IntPoint& position, HitTestTy
     if (!m_box.is_root()) {
         result = m_box.hit_test(position, type);
     } else {
-        // NOTE: LayoutDocument::hit_test() merely calls StackingContext::hit_test()
+        // NOTE: InitialContainingBlockBox::hit_test() merely calls StackingContext::hit_test()
         //       so we call its base class instead.
-        result = downcast<LayoutDocument>(m_box).LayoutBlock::hit_test(position, type);
+        result = downcast<InitialContainingBlockBox>(m_box).BlockBox::hit_test(position, type);
     }
 
     for (auto* child : m_children) {
diff --git a/Libraries/LibWeb/Painting/StackingContext.h b/Libraries/LibWeb/Painting/StackingContext.h
index d7621c3829..7e2e11e2d9 100644
--- a/Libraries/LibWeb/Painting/StackingContext.h
+++ b/Libraries/LibWeb/Painting/StackingContext.h
@@ -27,26 +27,24 @@
 #pragma once
 
 #include <AK/Vector.h>
-#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Layout/Node.h>
 
-namespace Web {
-
-class LayoutBox;
+namespace Web::Layout {
 
 class StackingContext {
 public:
-    StackingContext(LayoutBox&, StackingContext* parent);
+    StackingContext(Box&, StackingContext* parent);
 
     StackingContext* parent() { return m_parent; }
     const StackingContext* parent() const { return m_parent; }
 
-    void paint(PaintContext&, LayoutNode::PaintPhase);
+    void paint(PaintContext&, Layout::Node::PaintPhase);
     HitTestResult hit_test(const Gfx::IntPoint&, HitTestType) const;
 
     void dump(int indent = 0) const;
 
 private:
-    LayoutBox& m_box;
+    Box& m_box;
     StackingContext* const m_parent { nullptr };
     Vector<StackingContext*> m_children;
 };
diff --git a/Libraries/LibWeb/SVG/SVGPathElement.cpp b/Libraries/LibWeb/SVG/SVGPathElement.cpp
index 36a2ef2fb6..a0ec408fb3 100644
--- a/Libraries/LibWeb/SVG/SVGPathElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGPathElement.cpp
@@ -29,7 +29,7 @@
 #include <LibGfx/Path.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
-#include <LibWeb/Layout/LayoutSVGPath.h>
+#include <LibWeb/Layout/SVGPathBox.h>
 #include <LibWeb/SVG/SVGPathElement.h>
 #include <ctype.h>
 
@@ -430,12 +430,12 @@ SVGPathElement::SVGPathElement(DOM::Document& document, const QualifiedName& qua
 {
 }
 
-RefPtr<LayoutNode> SVGPathElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> SVGPathElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
     if (style->display() == CSS::Display::None)
         return nullptr;
-    return adopt(*new LayoutSVGPath(document(), *this, move(style)));
+    return adopt(*new Layout::SVGPathBox(document(), *this, move(style)));
 }
 
 void SVGPathElement::parse_attribute(const FlyString& name, const String& value)
diff --git a/Libraries/LibWeb/SVG/SVGPathElement.h b/Libraries/LibWeb/SVG/SVGPathElement.h
index 922c92b690..bca0da456d 100644
--- a/Libraries/LibWeb/SVG/SVGPathElement.h
+++ b/Libraries/LibWeb/SVG/SVGPathElement.h
@@ -109,7 +109,7 @@ public:
     SVGPathElement(DOM::Document&, const QualifiedName& qualified_name);
     virtual ~SVGPathElement() override = default;
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     virtual void parse_attribute(const FlyString& name, const String& value) override;
 
diff --git a/Libraries/LibWeb/SVG/SVGSVGElement.cpp b/Libraries/LibWeb/SVG/SVGSVGElement.cpp
index 0a0b2f75f3..cd5e1e6fbd 100644
--- a/Libraries/LibWeb/SVG/SVGSVGElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGSVGElement.cpp
@@ -28,7 +28,7 @@
 #include <LibWeb/CSS/StyleResolver.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
-#include <LibWeb/Layout/LayoutSVGSVG.h>
+#include <LibWeb/Layout/SVGSVGBox.h>
 #include <LibWeb/SVG/SVGPathElement.h>
 #include <LibWeb/SVG/SVGSVGElement.h>
 #include <ctype.h>
@@ -40,12 +40,12 @@ SVGSVGElement::SVGSVGElement(DOM::Document& document, const QualifiedName& quali
 {
 }
 
-RefPtr<LayoutNode> SVGSVGElement::create_layout_node(const CSS::StyleProperties* parent_style)
+RefPtr<Layout::Node> SVGSVGElement::create_layout_node(const CSS::StyleProperties* parent_style)
 {
     auto style = document().style_resolver().resolve_style(*this, parent_style);
     if (style->display() == CSS::Display::None)
         return nullptr;
-    return adopt(*new LayoutSVGSVG(document(), *this, move(style)));
+    return adopt(*new Layout::SVGSVGBox(document(), *this, move(style)));
 }
 
 unsigned SVGSVGElement::width() const
diff --git a/Libraries/LibWeb/SVG/SVGSVGElement.h b/Libraries/LibWeb/SVG/SVGSVGElement.h
index 82be0cada2..4478ebd617 100644
--- a/Libraries/LibWeb/SVG/SVGSVGElement.h
+++ b/Libraries/LibWeb/SVG/SVGSVGElement.h
@@ -37,7 +37,7 @@ public:
 
     SVGSVGElement(DOM::Document&, const QualifiedName& qualified_name);
 
-    virtual RefPtr<LayoutNode> create_layout_node(const CSS::StyleProperties* parent_style) override;
+    virtual RefPtr<Layout::Node> create_layout_node(const CSS::StyleProperties* parent_style) override;
 
     unsigned width() const;
     unsigned height() const;