diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71c736d2a3..f24bc543b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Svelte changelog
 
+## Unreleased
+
+* Handle `width`/`height` attributes when spreading ([#6752](https://github.com/sveltejs/svelte/issues/6752))
+* Add support for resize observer bindings (`<div bind:contentRect|contentBoxSize|borderBoxSize|devicePixelContentBoxSize>`) ([#8022](https://github.com/sveltejs/svelte/pull/8022))
+
 ## 3.58.0
 
 - Add `bind:innerText` for `contenteditable` elements ([#3311](https://github.com/sveltejs/svelte/issues/3311))
diff --git a/elements/index.d.ts b/elements/index.d.ts
index 7595d767bf..ac32ae94c3 100644
--- a/elements/index.d.ts
+++ b/elements/index.d.ts
@@ -546,6 +546,11 @@ export interface HTMLAttributes<T extends EventTarget> extends AriaAttributes, D
 	 */
 	'bind:innerText'?: string | undefined | null;
 
+	readonly 'bind:contentRect'?: DOMRectReadOnly | undefined | null;
+	readonly 'bind:contentBoxSize'?: Array<{ blockSize: number; inlineSize: number }> | undefined | null; // TODO make this ResizeObserverSize once we require TS>=4.4
+	readonly 'bind:borderBoxSize'?: Array<{ blockSize: number; inlineSize: number }> | undefined | null; // TODO make this ResizeObserverSize once we require TS>=4.4
+	readonly 'bind:devicePixelContentBoxSize'?: Array<{ blockSize: number; inlineSize: number }> | undefined | null; // TODO make this ResizeObserverSize once we require TS>=4.4
+
 	// SvelteKit
 	'data-sveltekit-keepfocus'?: true | '' | 'off' | undefined | null;
 	'data-sveltekit-noscroll'?: true | '' | 'off' | undefined | null;
diff --git a/package-lock.json b/package-lock.json
index f09607d922..2078ecd761 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "devDependencies": {
         "@ampproject/remapping": "^0.3.0",
-        "@jridgewell/sourcemap-codec": "^1.4.14",
+        "@jridgewell/sourcemap-codec": "^1.4.15",
         "@rollup/plugin-commonjs": "^11.0.0",
         "@rollup/plugin-json": "^6.0.0",
         "@rollup/plugin-node-resolve": "^11.2.1",
@@ -185,9 +185,9 @@
       }
     },
     "node_modules/@jridgewell/sourcemap-codec": {
-      "version": "1.4.14",
-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
-      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "version": "1.4.15",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
+      "integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
       "dev": true
     },
     "node_modules/@nodelib/fs.scandir": {
@@ -5526,9 +5526,9 @@
       "dev": true
     },
     "@jridgewell/sourcemap-codec": {
-      "version": "1.4.14",
-      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.14.tgz",
-      "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw==",
+      "version": "1.4.15",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
+      "integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
       "dev": true
     },
     "@nodelib/fs.scandir": {
diff --git a/package.json b/package.json
index 51aebb666d..df0668e077 100644
--- a/package.json
+++ b/package.json
@@ -120,7 +120,7 @@
   "homepage": "https://svelte.dev",
   "devDependencies": {
     "@ampproject/remapping": "^0.3.0",
-    "@jridgewell/sourcemap-codec": "^1.4.14",
+    "@jridgewell/sourcemap-codec": "^1.4.15",
     "@rollup/plugin-commonjs": "^11.0.0",
     "@rollup/plugin-json": "^6.0.0",
     "@rollup/plugin-node-resolve": "^11.2.1",
diff --git a/site/content/docs/02-template-syntax/01-svelte-components.md b/site/content/docs/02-template-syntax/01-svelte-components.md
index 6c4786fe03..460562fed8 100644
--- a/site/content/docs/02-template-syntax/01-svelte-components.md
+++ b/site/content/docs/02-template-syntax/01-svelte-components.md
@@ -256,7 +256,7 @@ You cannot `export default`, since the default export is the component itself.
 <script context="module">
 	let totalComponents = 0;
 
-	// this allows an importer to do e.g.
+	// the export keyword allows this function to imported with e.g.
 	// `import Example, { alertTotal } from './Example.svelte'`
 	export function alertTotal() {
 		alert(totalComponents);
diff --git a/src/compiler/compile/nodes/Binding.ts b/src/compiler/compile/nodes/Binding.ts
index 0c29f7ec67..303506222f 100644
--- a/src/compiler/compile/nodes/Binding.ts
+++ b/src/compiler/compile/nodes/Binding.ts
@@ -3,7 +3,7 @@ import get_object from '../utils/get_object';
 import Expression from './shared/Expression';
 import Component from '../Component';
 import TemplateScope from './shared/TemplateScope';
-import { regex_dimensions } from '../../utils/patterns';
+import { regex_dimensions, regex_box_size } from '../../utils/patterns';
 import { Node as ESTreeNode } from 'estree';
 import { TemplateNode } from '../../interfaces';
 import Element from './Element';
@@ -92,6 +92,7 @@ export default class Binding extends Node {
 
 		this.is_readonly =
 			regex_dimensions.test(this.name) ||
+			regex_box_size.test(this.name) ||
 			(isElement(parent) &&
 				((parent.is_media_node() && read_only_media_attributes.has(this.name)) ||
 					(parent.name === 'input' && type === 'file')) /* TODO others? */);
diff --git a/src/compiler/compile/nodes/Element.ts b/src/compiler/compile/nodes/Element.ts
index 1678ea1caa..2410904d63 100644
--- a/src/compiler/compile/nodes/Element.ts
+++ b/src/compiler/compile/nodes/Element.ts
@@ -12,7 +12,7 @@ import Text from './Text';
 import { namespaces } from '../../utils/namespaces';
 import map_children from './shared/map_children';
 import { is_name_contenteditable, get_contenteditable_attr } from '../utils/contenteditable';
-import { regex_dimensions, regex_starts_with_newline, regex_non_whitespace_character } from '../../utils/patterns';
+import { regex_dimensions, regex_starts_with_newline, regex_non_whitespace_character, regex_box_size } from '../../utils/patterns';
 import fuzzymatch from '../../utils/fuzzymatch';
 import list from '../../utils/list';
 import Let from './Let';
@@ -1090,7 +1090,10 @@ export default class Element extends Node {
 				} else if (contenteditable && !contenteditable.is_static) {
 					return component.error(contenteditable, compiler_errors.dynamic_contenteditable_attribute);
 				}
-			} else if (name !== 'this') {
+			} else if (
+				name !== 'this' &&
+				!regex_box_size.test(name)
+			) {
 				return component.error(binding, compiler_errors.invalid_binding(binding.name));
 			}
 		});
diff --git a/src/compiler/compile/render_dom/wrappers/Element/Binding.ts b/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
index 642e4694b1..01da1f0e12 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/Binding.ts
@@ -11,6 +11,7 @@ import { Node, Identifier } from 'estree';
 import add_to_set from '../../../utils/add_to_set';
 import mark_each_block_bindings from '../shared/mark_each_block_bindings';
 import handle_select_value_binding from './handle_select_value_binding';
+import { regex_box_size } from '../../../../utils/patterns';
 
 export default class BindingWrapper {
 	node: Binding;
@@ -455,7 +456,12 @@ function get_value_from_dom(
 		return x`$$value`;
 	}
 
-	// <select bind:value='selected'>
+	// <div bind:contentRect|contentBoxSize|borderBoxSize|devicePixelContentBoxSize>
+	if (regex_box_size.test(name)) {
+		return x`@ResizeObserverSingleton.entries.get(this)?.${name}`;
+	}
+
+	// <select bind:value='selected>
 	if (node.name === 'select') {
 		return node.get_static_attribute_value('multiple') === true ?
 			x`@select_multiple_value(this)` :
diff --git a/src/compiler/compile/render_dom/wrappers/Element/index.ts b/src/compiler/compile/render_dom/wrappers/Element/index.ts
index 7a0bdbaa06..cefebfcff3 100644
--- a/src/compiler/compile/render_dom/wrappers/Element/index.ts
+++ b/src/compiler/compile/render_dom/wrappers/Element/index.ts
@@ -12,7 +12,7 @@ import { namespaces } from '../../../../utils/namespaces';
 import AttributeWrapper from './Attribute';
 import StyleAttributeWrapper from './StyleAttribute';
 import SpreadAttributeWrapper from './SpreadAttribute';
-import { regex_dimensions, regex_starts_with_newline, regex_backslashes } from '../../../../utils/patterns';
+import { regex_dimensions, regex_starts_with_newline, regex_backslashes, regex_border_box_size, regex_content_box_size, regex_device_pixel_content_box_size, regex_content_rect } from '../../../../utils/patterns';
 import Binding from './Binding';
 import add_to_set from '../../../utils/add_to_set';
 import { add_event_handler } from '../shared/add_event_handlers';
@@ -64,11 +64,29 @@ const events = [
 		filter: (node: Element, _name: string) =>
 			node.name === 'input' && node.get_static_attribute_value('type') === 'range'
 	},
+	// resize events
 	{
 		event_names: ['elementresize'],
 		filter: (_node: Element, name: string) =>
 			regex_dimensions.test(name)
 	},
+	{
+		event_names: ['elementresizecontentbox'],
+		filter: (_node: Element, name: string) =>
+			regex_content_rect.test(name) ?? regex_content_box_size.test(name)
+	},
+
+	{
+		event_names: ['elementresizeborderbox'],
+		filter: (_node: Element, name: string) => 
+			regex_border_box_size.test(name)
+	},
+
+	{
+		event_names: ['elementresizedevicepixelcontentbox'],
+		filter: (_node: Element, name: string) =>
+			regex_device_pixel_content_box_size.test(name)
+	},
 	// media events
 	{
 		event_names: ['timeupdate'],
@@ -747,14 +765,33 @@ export default class ElementWrapper extends Wrapper {
 		`);
 
 		binding_group.events.forEach(name => {
-			if (name === 'elementresize') {
-				// special case
+			if (['elementresize', 'elementresizecontentbox', 'elementresizeborderbox', 'elementresizedevicepixelcontentbox'].indexOf(name) !== -1) {
 				const resize_listener = block.get_unique_name(`${this.var.name}_resize_listener`);
 				block.add_variable(resize_listener);
 
-				block.chunks.mount.push(
-					b`${resize_listener} = @add_resize_listener(${this.var}, ${callee}.bind(${this.var}));`
-				);
+				// Can't dynamically do `@fn[name]`, code-red doesn't know how to resolve it
+				switch (name) {
+					case 'elementresize':
+						block.chunks.mount.push(
+							b`${resize_listener} = @add_iframe_resize_listener(${this.var}, ${callee}.bind(${this.var}));`
+						);
+						break;
+					case 'elementresizecontentbox':
+						block.chunks.mount.push(
+							b`${resize_listener} = @resize_observer_content_box.observe(${this.var}, ${callee}.bind(${this.var}));`
+						);
+						break;
+					case 'elementresizeborderbox':
+						block.chunks.mount.push(
+							b`${resize_listener} = @resize_observer_border_box.observe(${this.var}, ${callee}.bind(${this.var}));`
+						);
+						break;
+					case 'elementresizedevicepixelcontentbox':
+						block.chunks.mount.push(
+							b`${resize_listener} = @resize_observer_device_pixel_content_box.observe(${this.var}, ${callee}.bind(${this.var}));`
+						);
+						break;
+				}
 
 				block.chunks.destroy.push(
 					b`${resize_listener}();`
diff --git a/src/compiler/utils/patterns.ts b/src/compiler/utils/patterns.ts
index 9429d47227..f0fb08c7c9 100644
--- a/src/compiler/utils/patterns.ts
+++ b/src/compiler/utils/patterns.ts
@@ -22,3 +22,9 @@ export const regex_ends_with_underscore = /_$/;
 export const regex_invalid_variable_identifier_characters = /[^a-zA-Z0-9_$]/g;
 
 export const regex_dimensions = /^(?:offset|client)(?:Width|Height)$/;
+
+export const regex_content_rect = /^(?:contentRect)$/;
+export const regex_content_box_size = /^(?:contentBoxSize)$/;
+export const regex_border_box_size = /^(?:borderBoxSize)$/;
+export const regex_device_pixel_content_box_size = /^(?:devicePixelContentBoxSize)$/;
+export const regex_box_size = /^(?:contentRect|contentBoxSize|borderBoxSize|devicePixelContentBoxSize)$/;
diff --git a/src/runtime/internal/ResizeObserverSingleton.ts b/src/runtime/internal/ResizeObserverSingleton.ts
new file mode 100644
index 0000000000..773f68e4ff
--- /dev/null
+++ b/src/runtime/internal/ResizeObserverSingleton.ts
@@ -0,0 +1,69 @@
+import { globals } from './globals';
+
+/**
+ * Resize observer singleton.
+ * One listener per element only!
+ * https://groups.google.com/a/chromium.org/g/blink-dev/c/z6ienONUb5A/m/F5-VcUZtBAAJ
+ */
+export class ResizeObserverSingleton {
+	constructor(readonly options?: ResizeObserverOptions) {}
+
+	observe(element: Element, listener: Listener) {
+		this._listeners.set(element, listener);
+		this._getObserver().observe(element, this.options);
+		return () => {
+			this._listeners.delete(element);
+			this._observer.unobserve(element); // this line can probably be removed
+		};
+	}
+
+	private readonly _listeners: WeakMap<Element, Listener> = 'WeakMap' in globals ? new WeakMap() : undefined;
+	private _observer?: ResizeObserver;
+	private _getObserver() {
+		return this._observer ?? (this._observer = new ResizeObserver((entries) => {
+			for (const entry of entries) {
+				(ResizeObserverSingleton as any).entries.set(entry.target, entry);
+				this._listeners.get(entry.target)?.(entry);
+			}
+		}));
+	}
+}
+// Needs to be written like this to pass the tree-shake-test
+(ResizeObserverSingleton as any).entries = 'WeakMap' in globals ? new WeakMap() : undefined;
+
+type Listener = (entry: ResizeObserverEntry)=>any;
+
+// TODO: Remove this
+interface ResizeObserverSize {
+    readonly blockSize: number;
+    readonly inlineSize: number;
+}
+
+interface ResizeObserverEntry {
+    readonly borderBoxSize: readonly ResizeObserverSize[];
+    readonly contentBoxSize: readonly ResizeObserverSize[];
+    readonly contentRect: DOMRectReadOnly;
+    readonly devicePixelContentBoxSize: readonly ResizeObserverSize[];
+    readonly target: Element;
+}
+
+type ResizeObserverBoxOptions = 'border-box' | 'content-box' | 'device-pixel-content-box';
+
+interface ResizeObserverOptions {
+    box?: ResizeObserverBoxOptions;
+}
+
+interface ResizeObserver {
+    disconnect(): void;
+    observe(target: Element, options?: ResizeObserverOptions): void;
+    unobserve(target: Element): void;
+}
+
+interface ResizeObserverCallback {
+    (entries: ResizeObserverEntry[], observer: ResizeObserver): void;
+}
+
+declare let ResizeObserver: {
+    prototype: ResizeObserver;
+    new(callback: ResizeObserverCallback): ResizeObserver;
+};
diff --git a/src/runtime/internal/dom.ts b/src/runtime/internal/dom.ts
index 34049b3580..c025313c15 100644
--- a/src/runtime/internal/dom.ts
+++ b/src/runtime/internal/dom.ts
@@ -1,3 +1,4 @@
+import { ResizeObserverSingleton } from './ResizeObserverSingleton';
 import { contenteditable_truthy_values, has_prop } from './utils';
 
 // Track which nodes are claimed during hydration. Unclaimed nodes can then be removed from the DOM
@@ -306,6 +307,15 @@ export function attr(node: Element, attribute: string, value?: string) {
 	else if (node.getAttribute(attribute) !== value) node.setAttribute(attribute, value);
 }
 
+/** 
+ * List of attributes that should always be set through the attr method,
+ * because updating them through the property setter doesn't work reliably.
+ * In the example of `width`/`height`, the problem is that the setter only
+ * accepts numeric values, but the attribute can also be set to a string like `50%`.
+ * If this list becomes too big, rethink this approach.
+ */
+const always_set_through_set_attribute = ['width', 'height'];
+
 export function set_attributes(node: Element & ElementCSSInlineStyle, attributes: { [x: string]: string }) {
 	// @ts-ignore
 	const descriptors = Object.getOwnPropertyDescriptors(node.__proto__);
@@ -316,7 +326,7 @@ export function set_attributes(node: Element & ElementCSSInlineStyle, attributes
 			node.style.cssText = attributes[key];
 		} else if (key === '__value') {
 			(node as any).value = node[key] = attributes[key];
-		} else if (descriptors[key] && descriptors[key].set) {
+		} else if (descriptors[key] && descriptors[key].set && always_set_through_set_attribute.indexOf(key) === -1) {
 			node[key] = attributes[key];
 		} else {
 			attr(node, key, attributes[key]);
@@ -689,7 +699,7 @@ export function is_crossorigin() {
 	return crossorigin;
 }
 
-export function add_resize_listener(node: HTMLElement, fn: () => void) {
+export function add_iframe_resize_listener(node: HTMLElement, fn: () => void) {
 	const computed_style = getComputedStyle(node);
 
 	if (computed_style.position === 'static') {
@@ -737,6 +747,11 @@ export function add_resize_listener(node: HTMLElement, fn: () => void) {
 	};
 }
 
+export const resize_observer_content_box = /* @__PURE__ */ new ResizeObserverSingleton({ box: 'content-box' });
+export const resize_observer_border_box = /* @__PURE__ */ new ResizeObserverSingleton({ box: 'border-box' });
+export const resize_observer_device_pixel_content_box = /* @__PURE__ */ new ResizeObserverSingleton({ box: 'device-pixel-content-box' });
+export { ResizeObserverSingleton };
+
 export function toggle_class(element, name, toggle) {
 	element.classList[toggle ? 'add' : 'remove'](name);
 }
diff --git a/test/js/samples/bind-width-height/expected.js b/test/js/samples/bind-width-height/expected.js
index 8966e57c9c..287c1b95b8 100644
--- a/test/js/samples/bind-width-height/expected.js
+++ b/test/js/samples/bind-width-height/expected.js
@@ -1,8 +1,8 @@
 /* generated by Svelte vX.Y.Z */
 import {
 	SvelteComponent,
+	add_iframe_resize_listener,
 	add_render_callback,
-	add_resize_listener,
 	detach,
 	element,
 	init,
@@ -23,7 +23,7 @@ function create_fragment(ctx) {
 		},
 		m(target, anchor) {
 			insert(target, div, anchor);
-			div_resize_listener = add_resize_listener(div, /*div_elementresize_handler*/ ctx[2].bind(div));
+			div_resize_listener = add_iframe_resize_listener(div, /*div_elementresize_handler*/ ctx[2].bind(div));
 		},
 		p: noop,
 		i: noop,
diff --git a/test/js/samples/video-bindings/expected.js b/test/js/samples/video-bindings/expected.js
index fe30240bfc..4ef1c2f7d8 100644
--- a/test/js/samples/video-bindings/expected.js
+++ b/test/js/samples/video-bindings/expected.js
@@ -1,8 +1,8 @@
 /* generated by Svelte vX.Y.Z */
 import {
 	SvelteComponent,
+	add_iframe_resize_listener,
 	add_render_callback,
-	add_resize_listener,
 	detach,
 	element,
 	init,
@@ -42,7 +42,7 @@ function create_fragment(ctx) {
 		},
 		m(target, anchor) {
 			insert(target, video, anchor);
-			video_resize_listener = add_resize_listener(video, /*video_elementresize_handler*/ ctx[7].bind(video));
+			video_resize_listener = add_iframe_resize_listener(video, /*video_elementresize_handler*/ ctx[7].bind(video));
 
 			if (!mounted) {
 				dispose = [
diff --git a/test/runtime/samples/spread-width-height-attributes/_config.js b/test/runtime/samples/spread-width-height-attributes/_config.js
new file mode 100644
index 0000000000..cf2dc7efde
--- /dev/null
+++ b/test/runtime/samples/spread-width-height-attributes/_config.js
@@ -0,0 +1,4 @@
+export default {
+	// https://github.com/sveltejs/svelte/issues/6752
+	html: '<img height="100%" width="100%" alt="" />'
+};
diff --git a/test/runtime/samples/spread-width-height-attributes/main.svelte b/test/runtime/samples/spread-width-height-attributes/main.svelte
new file mode 100644
index 0000000000..b91b008457
--- /dev/null
+++ b/test/runtime/samples/spread-width-height-attributes/main.svelte
@@ -0,0 +1 @@
+<img height="100%" width="100%" alt="" {...$$restProps} />