diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index db4974631..fe5aba889 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -3,9 +3,10 @@ on: pull_request
 jobs:
   build:
     runs-on: ubuntu-latest
+    continue-on-error: true
     strategy:
       matrix:
-        node-version: [16]
+        node-version: [16, 18, 20]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/.gitignore b/.gitignore
index c87bd1984..0fd8f798c 100755
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 node_modules
 tmp
 lerna-debug.log
+.DS_Store
 .vscode
 .idea
 .turbo
\ No newline at end of file
diff --git a/packages/happy-dom/src/form-data/FormData.ts b/packages/happy-dom/src/form-data/FormData.ts
index 8c5f56809..db88dbfc5 100644
--- a/packages/happy-dom/src/form-data/FormData.ts
+++ b/packages/happy-dom/src/form-data/FormData.ts
@@ -75,7 +75,7 @@ export default class FormData implements Iterable<[string, string | File]> {
 	 */
 	public forEach(callback: (key: string, value: string | File, thisArg: FormData) => void): void {
 		for (const entry of this.#entries) {
-			callback.call(this, entry.name, entry.value, this);
+			callback.call(this, entry.value, entry.name, this);
 		}
 	}
 
diff --git a/packages/happy-dom/src/named-node-map/INamedNodeMap.ts b/packages/happy-dom/src/named-node-map/INamedNodeMap.ts
index 1cf23829b..395288894 100644
--- a/packages/happy-dom/src/named-node-map/INamedNodeMap.ts
+++ b/packages/happy-dom/src/named-node-map/INamedNodeMap.ts
@@ -22,7 +22,7 @@ export default interface INamedNodeMap {
 	 * Returns named item.
 	 *
 	 * @param name Name.
-	 * @returns Itme.
+	 * @returns Item.
 	 */
 	getNamedItem(name: string): IAttr | null;
 
diff --git a/packages/happy-dom/src/named-node-map/NamedNodeMap.ts b/packages/happy-dom/src/named-node-map/NamedNodeMap.ts
index 9fe4c4f5a..96cb78469 100644
--- a/packages/happy-dom/src/named-node-map/NamedNodeMap.ts
+++ b/packages/happy-dom/src/named-node-map/NamedNodeMap.ts
@@ -47,7 +47,7 @@ export default class NamedNodeMap implements INamedNodeMap {
 	 * Returns named item.
 	 *
 	 * @param name Name.
-	 * @returns Itme.
+	 * @returns Item.
 	 */
 	public getNamedItem(name: string): IAttr | null {
 		return this[PropertySymbol.namedItems][name] || null;
diff --git a/packages/happy-dom/src/navigator/Navigator.ts b/packages/happy-dom/src/navigator/Navigator.ts
index a8dd4b593..a9300746d 100644
--- a/packages/happy-dom/src/navigator/Navigator.ts
+++ b/packages/happy-dom/src/navigator/Navigator.ts
@@ -4,6 +4,8 @@ import IBrowserWindow from '../window/IBrowserWindow.js';
 import Permissions from '../permissions/Permissions.js';
 import Clipboard from '../clipboard/Clipboard.js';
 import WindowBrowserSettingsReader from '../window/WindowBrowserSettingsReader.js';
+import Blob from '../file/Blob.js';
+import FormData from '../form-data/FormData.js';
 
 /**
  * Browser Navigator API.
@@ -212,6 +214,24 @@ export default class Navigator {
 		return new PluginArray([]);
 	}
 
+	/**
+	 * Sends an HTTP POST request containing a small amount of data to a web server.
+	 *
+	 * @param url URL.
+	 * @param data Data.
+	 * @returns "true" if the user agent successfully queued the data for transfer. Otherwise, it returns "false".
+	 */
+	public sendBeacon(
+		url: string,
+		data: string | Blob | ArrayBuffer | ArrayBufferView | FormData
+	): boolean {
+		this.#ownerWindow.fetch(url, {
+			method: 'POST',
+			body: data
+		});
+		return true;
+	}
+
 	/**
 	 * Returns the object as a string.
 	 *
diff --git a/packages/happy-dom/src/nodes/element/Element.ts b/packages/happy-dom/src/nodes/element/Element.ts
index b1b829412..9e0a8f73b 100644
--- a/packages/happy-dom/src/nodes/element/Element.ts
+++ b/packages/happy-dom/src/nodes/element/Element.ts
@@ -381,10 +381,6 @@ export default class Element extends Node implements IElement {
 		}
 
 		(<string>clone.tagName) = this.tagName;
-		clone.scrollLeft = this.scrollLeft;
-		clone.scrollTop = this.scrollTop;
-		clone.scrollWidth = this.scrollWidth;
-		clone.scrollHeight = this.scrollHeight;
 		(<string>clone.namespaceURI) = this.namespaceURI;
 
 		return <IElement>clone;
diff --git a/packages/happy-dom/src/nodes/html-input-element/HTMLInputElementDateUtility.ts b/packages/happy-dom/src/nodes/html-input-element/HTMLInputElementDateUtility.ts
index f89e14658..4d0446de4 100644
--- a/packages/happy-dom/src/nodes/html-input-element/HTMLInputElementDateUtility.ts
+++ b/packages/happy-dom/src/nodes/html-input-element/HTMLInputElementDateUtility.ts
@@ -5,24 +5,26 @@ export default class HTMLInputElementDateUtility {
 	/**
 	 * Returns iso week number from given date
 	 *
+	 * @see https://stackoverflow.com/a/6117889
 	 * @param date Date or number.
 	 * @returns Iso-week string.
 	 */
 	public static dateIsoWeek(date: Date | number): string {
-		date = new Date(date);
-		const day = (date.getUTCDay() + 6) % 7;
-		date.setUTCDate(date.getUTCDate() - day + 3);
-		const firstThursday = date.getTime();
-		date.setUTCMonth(0, 1);
-		if (date.getDay() !== 4) {
-			date.setUTCMonth(0, 1 + ((4 - date.getDay() + 7) % 7));
-		}
-		return (
-			date.getUTCFullYear() +
-			'-W' +
-			String(1 + Math.ceil((firstThursday - date.getTime()) / 604800000)).padStart(2, '0')
+		date = typeof date === 'number' ? new Date(date) : date;
+		// Copy date so don't modify original
+		date = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
+		// Set to nearest Thursday: current date + 4 - current day number
+		// Make Sunday's day number 7
+		date.setUTCDate(date.getUTCDate() + 4 - (date.getUTCDay() || 7));
+		// Get first day of year
+		const yearStart = new Date(Date.UTC(date.getUTCFullYear(), 0, 1));
+		// Calculate full weeks to nearest Thursday
+		const weekNo = Math.ceil(
+			((<number>(<unknown>date) - <number>(<unknown>yearStart)) / 86400000 + 1) / 7
 		);
+		return `${date.getUTCFullYear()}-W${weekNo < 10 ? '0' : ''}${weekNo}`;
 	}
+
 	/**
 	 * Returns a date object for monday of given iso week string (\d\d\d\d-W\d\d)
 	 *
@@ -37,7 +39,7 @@ export default class HTMLInputElementDateUtility {
 		}
 		const date = new Date(`${Y}-01-01T00:00Z`);
 		const jan4th = new Date(`${Y}-01-04T00:00Z`);
-		const jan4thDay = (jan4th.getDay() + 6) % 7;
+		const jan4thDay = (jan4th.getUTCDay() + 6) % 7;
 		const ordinalDate = 1 + (Number(W) - 1) * 7 - jan4thDay + 3;
 		date.setUTCDate(ordinalDate);
 		if (date.getUTCFullYear() > Number(Y)) {
diff --git a/packages/happy-dom/src/query-selector/SelectorParser.ts b/packages/happy-dom/src/query-selector/SelectorParser.ts
index a384f8120..5f5d05909 100644
--- a/packages/happy-dom/src/query-selector/SelectorParser.ts
+++ b/packages/happy-dom/src/query-selector/SelectorParser.ts
@@ -63,7 +63,7 @@ export default class SelectorParser {
 	 * Parses a selector string and returns an instance of SelectorItem.
 	 *
 	 * @param selector Selector.
-	 * @returns Selector itme.
+	 * @returns Selector item.
 	 */
 	public static getSelectorItem(selector: string): SelectorItem {
 		return this.getSelectorGroups(selector)[0][0];
diff --git a/packages/happy-dom/src/window/BrowserWindow.ts b/packages/happy-dom/src/window/BrowserWindow.ts
index cb4a75982..2b8eb4e05 100644
--- a/packages/happy-dom/src/window/BrowserWindow.ts
+++ b/packages/happy-dom/src/window/BrowserWindow.ts
@@ -324,6 +324,7 @@ export default class BrowserWindow extends EventTarget implements IBrowserWindow
 	public readonly TreeWalker = TreeWalker;
 	public readonly MutationObserver = MutationObserver;
 	public readonly MutationRecord = MutationRecord;
+	public readonly CSSStyleDeclaration = CSSStyleDeclaration;
 	public readonly EventTarget = EventTarget;
 	public readonly MessagePort = MessagePort;
 	public readonly DataTransfer = DataTransfer;
diff --git a/packages/happy-dom/src/window/IBrowserWindow.ts b/packages/happy-dom/src/window/IBrowserWindow.ts
index 84e062dce..c03672db6 100644
--- a/packages/happy-dom/src/window/IBrowserWindow.ts
+++ b/packages/happy-dom/src/window/IBrowserWindow.ts
@@ -378,6 +378,7 @@ export default interface IBrowserWindow extends IEventTarget, INodeJSGlobal {
 	readonly DOMParser: new () => DOMParser;
 	readonly MutationObserver: typeof MutationObserver;
 	readonly MutationRecord: typeof MutationRecord;
+	readonly CSSStyleDeclaration: typeof CSSStyleDeclaration;
 
 	// Events
 	onload: ((event: Event) => void) | null;
diff --git a/packages/happy-dom/test/form-data/FormData.test.ts b/packages/happy-dom/test/form-data/FormData.test.ts
index b0ab4b893..8c35edcb5 100644
--- a/packages/happy-dom/test/form-data/FormData.test.ts
+++ b/packages/happy-dom/test/form-data/FormData.test.ts
@@ -92,7 +92,7 @@ describe('FormData', () => {
 			formData.set('key2', 'value2');
 			const values: Array<{ key: string; value: string | File }> = [];
 
-			formData.forEach((key, value) => values.push({ key, value }));
+			formData.forEach((value, key) => values.push({ key, value }));
 
 			expect(values).toEqual([
 				{ key: 'key1', value: 'value1' },
diff --git a/packages/happy-dom/test/navigator/Navigator.test.ts b/packages/happy-dom/test/navigator/Navigator.test.ts
new file mode 100644
index 000000000..dc1054433
--- /dev/null
+++ b/packages/happy-dom/test/navigator/Navigator.test.ts
@@ -0,0 +1,110 @@
+import Window from '../../src/window/Window.js';
+import IWindow from '../../src/window/IWindow.js';
+import Navigator from '../../src/navigator/Navigator.js';
+import { beforeEach, afterEach, describe, it, expect, vi } from 'vitest';
+import Permissions from '../../src/permissions/Permissions.js';
+import Clipboard from '../../src/clipboard/Clipboard.js';
+import PackageVersion from '../../src/version.js';
+import IResponse from '../../src/fetch/types/IResponse.js';
+import IRequest from '../../src/fetch/types/IRequest.js';
+import Fetch from '../../src/fetch/Fetch.js';
+import Stream from 'stream';
+
+const GET_NAVIGATOR_PLATFORM = (): string => {
+	return (
+		'X11; ' +
+		process.platform.charAt(0).toUpperCase() +
+		process.platform.slice(1) +
+		' ' +
+		process.arch
+	);
+};
+const PROPERTIES = {
+	appCodeName: 'Mozilla',
+	appName: 'Netscape',
+	appVersion: `5.0 (${GET_NAVIGATOR_PLATFORM()}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${
+		PackageVersion.version
+	}`,
+	cookieEnabled: true,
+	credentials: null,
+	doNotTrack: 'unspecified',
+	geolocation: null,
+	hardwareConcurrency: 8,
+	language: 'en-US',
+	languages: ['en-US', 'en'],
+	locks: null,
+	maxTouchPoints: 0,
+	mimeTypes: {
+		length: 0
+	},
+	onLine: true,
+	permissions: new Permissions(),
+	platform: GET_NAVIGATOR_PLATFORM(),
+	plugins: {
+		length: 0
+	},
+	product: 'Gecko',
+	productSub: '20100101',
+	userAgent: `Mozilla/5.0 (${GET_NAVIGATOR_PLATFORM()}) AppleWebKit/537.36 (KHTML, like Gecko) HappyDOM/${
+		PackageVersion.version
+	}`,
+	vendor: '',
+	vendorSub: '',
+	webdriver: true
+};
+
+describe('Window', () => {
+	let window: IWindow;
+
+	beforeEach(() => {
+		window = new Window();
+	});
+
+	afterEach(() => {
+		resetMockedModules();
+		vi.restoreAllMocks();
+	});
+
+	describe('constructor()', () => {
+		it('Is instanceof Navigator.', () => {
+			expect(window.navigator instanceof Navigator).toBe(true);
+		});
+	});
+
+	Object.keys(PROPERTIES).forEach((property) => {
+		describe(`get ${property}()`, () => {
+			it('Returns an instance of Navigator with browser data.', () => {
+				expect(window.navigator[property]).toEqual(PROPERTIES[property]);
+			});
+		});
+	});
+
+	describe('get clipboard()', () => {
+		it('Returns an instance of Clipboard.', () => {
+			expect(window.navigator.clipboard).toEqual(new Clipboard(window));
+		});
+	});
+
+	describe('sendBeacon()', () => {
+		it('Sends a beacon request.', async () => {
+			const expectedURL = 'https://localhost:8080/path/';
+			let request: IRequest | null = null;
+
+			vi.spyOn(Fetch.prototype, 'send').mockImplementation(function (): Promise<IResponse> {
+				request = <IRequest>this.request;
+				return Promise.resolve(<IResponse>{});
+			});
+
+			window.navigator.sendBeacon(expectedURL, 'test-data');
+
+			const chunks: Buffer[] = [];
+
+			for await (const chunk of <Stream.Readable>(<IRequest>(<unknown>request)).body) {
+				chunks.push(Buffer.from(chunk));
+			}
+
+			expect(Buffer.concat(chunks).toString()).toBe('test-data');
+			expect((<IRequest>(<unknown>request)).url).toBe(expectedURL);
+		});
+	});
+});
diff --git a/packages/happy-dom/test/nodes/element/Element.test.ts b/packages/happy-dom/test/nodes/element/Element.test.ts
index f0cc9e3ca..15efa77aa 100644
--- a/packages/happy-dom/test/nodes/element/Element.test.ts
+++ b/packages/happy-dom/test/nodes/element/Element.test.ts
@@ -1549,8 +1549,6 @@ describe('Element', () => {
 			child.className = 'className';
 
 			(<string>element.tagName) = 'tagName';
-			(<number>element.scrollLeft) = 10;
-			(<number>element.scrollTop) = 10;
 
 			// @ts-ignore
 			element.namespaceURI = 'namespaceURI';
@@ -1560,8 +1558,6 @@ describe('Element', () => {
 			const clone = element.cloneNode(false);
 			const clone2 = element.cloneNode(true);
 			expect(clone.tagName).toBe('tagName');
-			expect(clone.scrollLeft).toBe(10);
-			expect(clone.scrollTop).toBe(10);
 			expect(clone.namespaceURI).toBe('namespaceURI');
 			expect(clone.children.length).toEqual(0);
 			expect(clone2.children.length).toBe(1);
diff --git a/packages/happy-dom/test/nodes/html-input-element/HTMLInputElement.test.ts b/packages/happy-dom/test/nodes/html-input-element/HTMLInputElement.test.ts
index abceaa4c8..1c181aa39 100644
--- a/packages/happy-dom/test/nodes/html-input-element/HTMLInputElement.test.ts
+++ b/packages/happy-dom/test/nodes/html-input-element/HTMLInputElement.test.ts
@@ -390,6 +390,7 @@ describe('HTMLInputElement', () => {
 			{ type: 'time', value: '00:00', want: new Date('1970-01-01T00:00Z') },
 			{ type: 'time', value: '12:00', want: new Date('1970-01-01T12:00Z') },
 			{ type: 'time', value: '18:55', want: new Date('1970-01-01T18:55Z') },
+			{ type: 'week', value: '1981-W01', want: new Date('1980-12-29T00:00Z') },
 			{ type: 'week', value: '2023-W22', want: new Date('2023-05-29T00:00Z') }
 		])(`Should return valid date for type $type with valid value`, ({ type, value, want }) => {
 			element.type = type;
diff --git a/packages/happy-dom/test/nodes/html-input-element/HTMLInputDateUtility.test.ts b/packages/happy-dom/test/nodes/html-input-element/HTMLInputElementDateUtility.test.ts
similarity index 98%
rename from packages/happy-dom/test/nodes/html-input-element/HTMLInputDateUtility.test.ts
rename to packages/happy-dom/test/nodes/html-input-element/HTMLInputElementDateUtility.test.ts
index e2b4bcb34..72777fdc0 100644
--- a/packages/happy-dom/test/nodes/html-input-element/HTMLInputDateUtility.test.ts
+++ b/packages/happy-dom/test/nodes/html-input-element/HTMLInputElementDateUtility.test.ts
@@ -2,7 +2,7 @@ import { describe, it, expect } from 'vitest';
 import HTMLInputElementDateUtility from '../../../src/nodes/html-input-element/HTMLInputElementDateUtility.js';
 
 describe('HTMLInputElementDateUtility', () => {
-	describe('dateToIsoWeek()', () => {
+	describe('dateIsoWeek()', () => {
 		it('Returns the ISO week number', () => {
 			expect(HTMLInputElementDateUtility.dateIsoWeek(new Date('2021-01-01'))).toBe('2020-W53');
 			expect(HTMLInputElementDateUtility.dateIsoWeek(new Date('2021-01-03'))).toBe('2020-W53');
@@ -35,7 +35,7 @@ describe('HTMLInputElementDateUtility', () => {
 		});
 	});
 
-	describe('IsoWeekToDate()', () => {
+	describe('isoWeekDate()', () => {
 		it('Returns the ISO week number', () => {
 			expect(HTMLInputElementDateUtility.isoWeekDate('2020-W53')).toEqual(
 				new Date('2020-12-28T00:00Z')
diff --git a/packages/happy-dom/test/window/BrowserWindow.test.ts b/packages/happy-dom/test/window/BrowserWindow.test.ts
index 56c612a89..47ed73686 100644
--- a/packages/happy-dom/test/window/BrowserWindow.test.ts
+++ b/packages/happy-dom/test/window/BrowserWindow.test.ts
@@ -616,7 +616,7 @@ describe('BrowserWindow', () => {
 					expect((<ErrorEvent>(<unknown>errorEvent)).error?.message).toBe('Test error');
 					expect((<ErrorEvent>(<unknown>errorEvent)).message).toBe('Test error');
 					resolve(null);
-				}, 15);
+				}, 20);
 			});
 		});
 	});
@@ -675,7 +675,7 @@ describe('BrowserWindow', () => {
 					expect((<ErrorEvent>(<unknown>errorEvent)).error?.message).toBe('Test error');
 					expect((<ErrorEvent>(<unknown>errorEvent)).message).toBe('Test error');
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 	});
@@ -773,7 +773,7 @@ describe('BrowserWindow', () => {
 					expect((<ErrorEvent>(<unknown>errorEvent)).error?.message).toBe('Test error');
 					expect((<ErrorEvent>(<unknown>errorEvent)).message).toBe('Test error');
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 	});
@@ -832,7 +832,7 @@ describe('BrowserWindow', () => {
 					expect((<ErrorEvent>(<unknown>errorEvent)).error?.message).toBe('Test error');
 					expect((<ErrorEvent>(<unknown>errorEvent)).message).toBe('Test error');
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 	});
@@ -969,7 +969,7 @@ describe('BrowserWindow', () => {
 				setTimeout(() => {
 					expect((<Event>loadEvent).target).toBe(document);
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 
@@ -1024,7 +1024,7 @@ describe('BrowserWindow', () => {
 					expect(window['test']).toBe('test');
 
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 
@@ -1052,7 +1052,7 @@ describe('BrowserWindow', () => {
 					expect((<Error>errorEvents[1].error).message).toBe('Timeout error');
 
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});
 	});
@@ -1152,8 +1152,8 @@ describe('BrowserWindow', () => {
 						expect((<MessageEvent>triggeredEvent).source).toBe(browserFrame.window);
 						expect((<MessageEvent>triggeredEvent).lastEventId).toBe('');
 						resolve(null);
-					}, 10);
-				}, 10);
+					}, 20);
+				}, 20);
 			});
 		});
 
@@ -1172,7 +1172,7 @@ describe('BrowserWindow', () => {
 				setTimeout(() => {
 					expect((<MessageEvent>triggeredEvent).data).toBe(message);
 					resolve(null);
-				}, 10);
+				}, 20);
 			});
 		});