diff --git a/README.md b/README.md
index bc772167e..dd9c65a50 100644
--- a/README.md
+++ b/README.md
@@ -12,9 +12,9 @@ If the Graphite project strikes your fancy, join our Discord community to chat w
 
 ## Design mockup
 
-This is a **work-in-progress mockup** of the viewport, properties, and layers panels. The mockup is a nonfunctional pixel-perfect prototype, not code. It is presently being replicated by a functional web UI.
+This is a **work-in-progress mockup** of the document, properties, and layers panels. The mockup is a nonfunctional pixel-perfect prototype, not code. It is presently being replicated by a functional web UI.
 
-![Interactive viewport](https://files.keavon.com/-/FatherlyGorgeousAmphiuma/capture.png)
+![Demo UI mockup](https://files.keavon.com/-/FatherlyGorgeousAmphiuma/capture.png)
 
 ## Vision
 
diff --git a/client/web/.eslintrc.js b/client/web/.eslintrc.js
index f09f8675a..e88b2c773 100644
--- a/client/web/.eslintrc.js
+++ b/client/web/.eslintrc.js
@@ -19,6 +19,6 @@ module.exports = {
 		"linebreak-style": ["error", "unix"],
 		indent: ["error", "tab"],
 		quotes: ["error", "double"],
-		camelcase: ["error", { ignoreImports: true, ignoreDestructuring: true }]
+		camelcase: ["error", { ignoreImports: true, ignoreDestructuring: true }],
 	},
 };
diff --git a/client/web/src/components/panel-system/DockablePanel.vue b/client/web/src/components/panel-system/DockablePanel.vue
index 742230ecd..9b3e8b983 100644
--- a/client/web/src/components/panel-system/DockablePanel.vue
+++ b/client/web/src/components/panel-system/DockablePanel.vue
@@ -166,7 +166,7 @@
 
 <script lang="ts">
 import { defineComponent } from "vue";
-import Viewport from "../panels/ViewportPanel.vue";
+import Document from "../panels/DocumentPanel.vue";
 import Properties from "../panels/PropertiesPanel.vue";
 import Layers from "../panels/LayersPanel.vue";
 import Minimap from "../panels/MinimapPanel.vue";
@@ -175,7 +175,7 @@ import CloseX from "../../../assets/svg/16x16-bounds-12x12-icon/close-x.svg";
 
 export default defineComponent({
 	components: {
-		Viewport,
+		Document,
 		Properties,
 		Layers,
 		Minimap,
diff --git a/client/web/src/components/panel-system/PanelArea.vue b/client/web/src/components/panel-system/PanelArea.vue
index 8d99d82a5..8cae33ae2 100644
--- a/client/web/src/components/panel-system/PanelArea.vue
+++ b/client/web/src/components/panel-system/PanelArea.vue
@@ -1,7 +1,7 @@
 <template>
 	<LayoutRow class="dockable-grid-subdivision">
 		<LayoutCol class="dockable-grid-subdivision" style="flex-grow: 1597;">
-			<DockablePanel :panelType="'Viewport'" :tabCloseButtons="true" :tabMinWidths="true" :tabLabels="['X-35B Over Death Valley*', 'Document 2', 'Document 3', 'Document 4', 'Document 5']" :tabActiveIndex="0" />
+			<DockablePanel :panelType="'Document'" :tabCloseButtons="true" :tabMinWidths="true" :tabLabels="['X-35B Over Death Valley*', 'Document 2', 'Document 3', 'Document 4', 'Document 5']" :tabActiveIndex="0" />
 		</LayoutCol>
 		<LayoutCol class="dockable-grid-resize-gutter"></LayoutCol>
 		<LayoutCol class="dockable-grid-subdivision" style="flex-grow: 319;">
diff --git a/client/web/src/components/panels/ViewportPanel.vue b/client/web/src/components/panels/DocumentPanel.vue
similarity index 76%
rename from client/web/src/components/panels/ViewportPanel.vue
rename to client/web/src/components/panels/DocumentPanel.vue
index 2c73e04d9..c6104a18c 100644
--- a/client/web/src/components/panels/ViewportPanel.vue
+++ b/client/web/src/components/panels/DocumentPanel.vue
@@ -1,5 +1,5 @@
 <template>
-	<LayoutCol :class="'viewport'">
+	<LayoutCol :class="'document'">
 		<LayoutRow :class="'options-bar'">
 			<div class="left side">
 				<!-- <span class="label">Select</span>
@@ -10,22 +10,24 @@
 				<!-- <span class="label">Layer 1</span> -->
 			</div>
 		</LayoutRow>
-		<LayoutRow :class="'tools-and-viewport'">
-			<LayoutCol :class="'tools'"></LayoutCol>
-			<LayoutCol
-				:class="'canvas'"
-				@mousedown="canvasMouseDown"
-				@mouseup="canvasMouseUp"
-				@mousemove="canvasMouseMove"
-			>
-				<svg></svg>
+		<LayoutRow :class="'toolbar-and-viewport'">
+			<LayoutCol :class="'toolbar'"></LayoutCol>
+			<LayoutCol :class="'viewport'">
+				<div
+					class="canvas"
+					@mousedown="canvasMouseDown"
+					@mouseup="canvasMouseUp"
+					@mousemove="canvasMouseMove"
+				>
+					<svg></svg>
+				</div>
 			</LayoutCol>
 		</LayoutRow>
 	</LayoutCol>
 </template>
 
 <style lang="scss">
-.viewport {
+.document {
 	height: 100%;
 
 	.options-bar {
@@ -59,19 +61,25 @@
 		}
 	}
 
-	.tools-and-viewport {
-		.tools {
+	.toolbar-and-viewport {
+		.toolbar {
 			flex: 0 0 32px;
 		}
 
-		.canvas {
-			background: #111;
+		.viewport {
 			flex: 1 1 100%;
 
-			svg {
+			.canvas {
+				background: #111;
 				width: 100%;
 				height: 100%;
+
+				svg {
+					width: 100%;
+					height: 100%;
+				}
 			}
+
 		}
 }
 }
@@ -91,17 +99,14 @@ export default defineComponent({
 	},
 	methods: {
 		async canvasMouseDown(e: MouseEvent) {
-			console.log(e);
 			const { on_mouse_down } = await wasm;
 			on_mouse_down(e.offsetX, e.offsetY, e.buttons);
 		},
 		async canvasMouseUp(e: MouseEvent) {
-			console.log(e);
 			const { on_mouse_up } = await wasm;
 			on_mouse_up(e.offsetX, e.offsetY, e.buttons);
 		},
 		async canvasMouseMove(e: MouseEvent) {
-			console.log(e);
 			const { on_mouse_move } = await wasm;
 			on_mouse_move(e.offsetX, e.offsetY);
 		},
diff --git a/client/web/src/wasm-callback-processor.js b/client/web/src/wasm-callback-processor.js
index ed24414a4..ad0b61655 100644
--- a/client/web/src/wasm-callback-processor.js
+++ b/client/web/src/wasm-callback-processor.js
@@ -1,3 +1,3 @@
-export function update_canvas(svg) {
-    document.querySelector(".canvas svg").innerHTML = svg;
+export function updateCanvas(svg) {
+	document.querySelector(".document .canvas svg").innerHTML = svg;
 }
diff --git a/client/web/wasm/src/viewport.rs b/client/web/wasm/src/document.rs
similarity index 76%
rename from client/web/wasm/src/viewport.rs
rename to client/web/wasm/src/document.rs
index 8fe90b16a..1a0008df4 100644
--- a/client/web/wasm/src/viewport.rs
+++ b/client/web/wasm/src/document.rs
@@ -13,30 +13,34 @@ pub fn select_tool(tool: String) -> Result<(), JsValue> {
 	})
 }
 
-/// Mouse movement with the bounds of the canvas
+// TODO: When a mouse button is down that started in the viewport, this should trigger even when the mouse is outside the viewport (or even the browser window if the browser supports it)
+/// Mouse movement within the screenspace bounds of the viewport
 #[wasm_bindgen]
 pub fn on_mouse_move(x: u32, y: u32) -> Result<(), JsValue> {
-	let ev = events::Event::MouseMovement(events::CanvasPosition { x, y });
+	// TODO: Convert these screenspace viewport coordinates to canvas coordinates based on the current zoom and pan
+	let ev = events::Event::MouseMovement(events::ViewportPosition { x, y });
 	EDITOR_STATE.with(|editor| editor.borrow_mut().handle_event(ev)).map_err(|err| Error::new(&err.to_string()).into())
 }
 
-/// Mouse click within the bounds of the canvas
+/// A mouse button depressed within screenspace the bounds of the viewport
 #[wasm_bindgen]
 pub fn on_mouse_down(x: u32, y: u32, mouse_keys: u8) -> Result<(), JsValue> {
+	// TODO: Convert these screenspace viewport coordinates to canvas coordinates based on the current zoom and pan
 	let mouse_keys = events::MouseKeys::from_bits(mouse_keys).expect("invalid modifier keys");
 	let ev = events::Event::MouseDown(events::MouseState {
-		position: events::CanvasPosition { x, y },
+		position: events::ViewportPosition { x, y },
 		mouse_keys,
 	});
 	EDITOR_STATE.with(|editor| editor.borrow_mut().handle_event(ev)).map_err(|err| Error::new(&err.to_string()).into())
 }
 
-/// Mouse released
+/// A mouse button released
 #[wasm_bindgen]
 pub fn on_mouse_up(x: u32, y: u32, mouse_keys: u8) -> Result<(), JsValue> {
+	// TODO: Convert these screenspace viewport coordinates to canvas coordinates based on the current zoom and pan
 	let mouse_keys = events::MouseKeys::from_bits(mouse_keys).expect("invalid modifier keys");
 	let ev = events::Event::MouseUp(events::MouseState {
-		position: events::CanvasPosition { x, y },
+		position: events::ViewportPosition { x, y },
 		mouse_keys,
 	});
 	EDITOR_STATE.with(|editor| editor.borrow_mut().handle_event(ev)).map_err(|err| Error::new(&err.to_string()).into())
diff --git a/client/web/wasm/src/lib.rs b/client/web/wasm/src/lib.rs
index 74caaecc7..b29fba464 100644
--- a/client/web/wasm/src/lib.rs
+++ b/client/web/wasm/src/lib.rs
@@ -1,6 +1,6 @@
+pub mod document;
 mod shims;
 pub mod utils;
-pub mod viewport;
 pub mod window;
 pub mod wrappers;
 
@@ -18,13 +18,13 @@ pub fn init() {
 
 fn handle_response(response: Response) {
 	match response {
-		Response::UpdateCanvas { document } => update_canvas(document),
+		Response::UpdateCanvas { document } => updateCanvas(document),
 	}
 }
 
 #[wasm_bindgen(module = "/../src/wasm-callback-processor.js")]
 extern "C" {
-	fn update_canvas(svg: String);
+	fn updateCanvas(svg: String);
 }
 
 #[wasm_bindgen]
diff --git a/core/editor/src/dispatcher/events.rs b/core/editor/src/dispatcher/events.rs
index 63389e156..be6ec0b3f 100644
--- a/core/editor/src/dispatcher/events.rs
+++ b/core/editor/src/dispatcher/events.rs
@@ -13,7 +13,7 @@ pub enum Event {
 	ResetColors,
 	MouseDown(MouseState),
 	MouseUp(MouseState),
-	MouseMovement(CanvasPosition),
+	MouseMovement(ViewportPosition),
 	ModifierKeyDown(ModKeys),
 	ModifierKeyUp(ModKeys),
 	KeyPress(Key),
@@ -50,7 +50,7 @@ impl Trace {
 
 // origin is top left
 #[derive(Debug, Copy, Clone, Default, Eq, PartialEq)]
-pub struct CanvasPosition {
+pub struct ViewportPosition {
 	pub x: u32,
 	pub y: u32,
 }
@@ -63,7 +63,7 @@ pub struct TracePoint {
 
 #[derive(Debug, Copy, Clone, Default, Eq, PartialEq)]
 pub struct MouseState {
-	pub position: CanvasPosition,
+	pub position: ViewportPosition,
 	pub mouse_keys: MouseKeys,
 }
 
@@ -74,7 +74,7 @@ impl MouseState {
 
 	pub fn from_pos(x: u32, y: u32) -> MouseState {
 		MouseState {
-			position: CanvasPosition { x, y },
+			position: ViewportPosition { x, y },
 			mouse_keys: MouseKeys::default(),
 		}
 	}
diff --git a/docs/codebase/architecture-overview.nomnoml b/docs/codebase/architecture-overview.nomnoml
index e7a9b51b3..b0d8db6ac 100644
--- a/docs/codebase/architecture-overview.nomnoml
+++ b/docs/codebase/architecture-overview.nomnoml
@@ -67,7 +67,7 @@
 
   [<editor> Open Documents State Store|
       For each open document:|
-      [<state> Pan and zoom viewport bounds]|
+      [<state> Pan and zoom canvas bounds]|
       [<state> Selected layers]
   ]
   [Tool State Machine] <- [Open Documents State Store]
diff --git a/docs/editor/1-overview.md b/docs/editor/1-overview.md
index 358ab6776..61111cb48 100644
--- a/docs/editor/1-overview.md
+++ b/docs/editor/1-overview.md
@@ -11,9 +11,9 @@ TODO: Add more to make a comprehensive list, finish writing definitions, separat
 - Asset  
   A *GDD* or *GRD* file. Can be shared and *embedded* in another *layer graph*. Useful for providing custom *nodes* that perform some useful functionality. Tangible examples include custom procedural effects, shape generators, and image filters. Many of the Graphite editor's built-in *layers* are also assets that provide useful functionality through a group of nodes rather than being implemented directly in code. The *Asset Manager* panel helps maintain these assets from various sources. The *Asset Store* can be used to share and sell assets for easily inclusion in projects.
 - Document  
-  A design source file created and edited in the Graphite editor. When saved to disk as *GDD files* (Graphite Design Document), they are one of the two types of *assets*. Documents can be included as *layers* inside other documents, and in doing so they take the form of *groups*. The *layer graph* contents of a *group* actually belong to the *embedded* document's *subgraph*. Because a document is a *group* which is a *layer* in the *layer graph*, documents have *properties* such as the (optional) *pixel bounds* of the *canvas*. Documents are composed of a layer graph, a defined set of properties of set *data types* that are *imported* and *exported*, and the *properties* of the root *layer*.
+  A design source file created and edited in the Graphite editor. When saved to disk as *GDD files* (Graphite Design Document), they are one of the two types of *assets*. Documents can be included as *layers* inside other documents, and in doing so they take the form of *groups*. The *layer graph* contents of a *group* actually belong to the *embedded* document's *subgraph*. Because a document is a *group* which is a *layer* in the *layer graph*, documents have *properties* such as the *frames* in the *canvas*. Documents are composed of a layer graph, a defined set of properties of set *data types* that are *imported* and *exported*, and the *properties* of the *root layer*.
 - Render graph  
-  A read-only "compiled" *document* in a format that is immediately ready for rendering. When saved to disk as *GRD files* (Graphite Render Data), they are one of the two types of *assets*. The Graphite editor internally maintains a render graph based on the open document in order to display it live in the *viewport*, but this can also be saved to disk for the purposes of sharing as an *asset*.
+  A read-only "compiled" *document* in a format that is immediately ready for rendering. When saved to disk as *GRD files* (Graphite Render Data), they are one of the two types of *assets*. The Graphite editor internally maintains a render graph based on the open document in order to display the *canvas* live in the *viewport*, but this can also be saved to disk for the purposes of sharing as an *asset*.
 - GDD file  
   Graphite Design Document. A binary serialization of a *document* source file. The format includes a chain of *operations* that describe changes to the *layer graph* and the *properties* of *layers* throughout the history of the document since its creation. It also stores certain metadata and *embedded* file data. GDD files, along with *GRD files*, represent *assets* when shared. Because GDD files are editable (unlike *GRD files*), the *layers* of GDD *assets* may be expanded in the layer graph to reveal and modify their contents using a copy-on-write scheme stored to the *asset's* *layer*.
 - GRD file  
@@ -35,14 +35,25 @@ TODO: Add more to make a comprehensive list, finish writing definitions, separat
   A shrunken *panel* showing only the *tab bar*. A *panel* consists of the *tab bar* and *panel body* except when the latter is folded away. The user may click the *active tab* to fold and restore a panel, however a panel cannot be folded if there are no other unfolded panels in its column.
 - Panel
 - Panel body
-- Panel content
-- Editor
+- Options bar  
+  The bar that spans horizontally across the top of a *panel* (located under the *tab bar*) which displays options related to the *panel*.
+- Viewport  
+  The area that takes up the main space in a *panel* (located beneath the *options bar*) which displays the primary content of the *panel*.
+- Toolbar  
+  The bar that spans vertically across the left side of some *panels* (located left of the *viewport*) which displays a catalog of available items, such as document editing *tools* or common *nodes*.
+- Tool  
+  An instrument for interactively editing *documents* through a collection of related behavior. Each tool puts the editor into a mode that provides the ability to perform certain *operations* on the document interactively. Each *operation* is run based on the current context of mouse and modifier buttons, key presses, tool options, selected layers, editor state, and document state. The *operations* that get run are appended to the document history and update the underlying *layer graph* in real time.
+- Canvas  
+  The infinite coordinate system that shows the visual output of an open *document* at the current zoom level and pan position. It is drawn in the document panel's *viewport* within the area inside the scroll bars on the bottom/right edges and the *rulers* on the top/left edges. The canvas can be panned and zoomed in order to display all or part of the artwork in any *frames*. A canvas has a coordinate system spanning infinitely in all directions with an origin always located at the top left of the primary *frame*. The purpose of an infinite canvas is to offer a convenient editing experience when there is no logical edge to the artwork, for example a loosely-arranged board of logo design concepts, a mood board, or whiteboard-style notes.
+- Frame  
+  An area inside a *canvas* that provides rectangular bounds to the artwork contained within, as well as default bounds for an exported image. This is also called an "artboard" in some other software. The *crop tool* adjusts the bounds and placement of frames in the *document* and each frame is stored in a "frame list" property of the *root layer*. When there is at least one frame, the infinite *canvas* area outside any frame displays a configurable background color. Artwork can be placed outside of a frame but it will appear mostly transparent. The purpose of using one frame is to provide convenient cropping to the edges of the artwork, such as a single digital painting or photograph. The purpose of using multiple frames is to work on related artwork with separate bounds, such as the layout for a book.
 - Layer graph  
   A (directed acyclic) graph structure composed of *layers* with *connections* between their input and output *ports*. This is commonly referred to as a "node graph" in other software, but Graphite's layer graph is more suited towards layer-based compositing compared to traditional compositor node graphs.
+- Node  
+  A definition of a *layer*. A node is a graph "operation" or "function" that receives input and generates deterministic output.
 - Layer  
   Any instance of a *node* that lives in the *layer graph*. Layers (usually) take input data, then they transform it or synthesize new data, then they provide it as output. Layers have *properties* as well as exposed input and output *ports* for sending and receiving data.
-- Node  
-  A definition of a 
+- Root layer
 - Group
 - Raster
 - Vector
@@ -51,12 +62,10 @@ TODO: Add more to make a comprehensive list, finish writing definitions, separat
 - Subgraph
 - Port
 - Connection
-- Pixel bounds
-- Canvas
 - Core Libraries
 - Editor Core Library
 - Document Core Library
 - Renderer Core Library
 - Trace
 - Path
-- Shape
\ No newline at end of file
+- Shape
diff --git a/docs/editor/index.md b/docs/editor/index.md
index 11abac047..fb1c160c0 100644
--- a/docs/editor/index.md
+++ b/docs/editor/index.md
@@ -7,14 +7,17 @@ Work in progress.
 	- [Glossary of terminology](1-overview.md#glossary-of-terminology)
 - Interface
 	- Title bar
+		- Menu bar
+		- Focused document title
+		- Window buttons
 	- Workspace
 		- Panel interface (tab, pin, options bar, left menu)
 		- Arrangement and docking
 	- Status bar
 	- Multiple windows
 - Panels
-	- Viewport
-		- Canvas
+	- Document
+		- Canvas and frames
 		- Rulers
 		- Tool menu
 		- Options bar