Implements customElements.getName() and fixes letter case handling.

packages/happy-dom/src/PropertySymbol.ts

@@ -149,3 +149,5 @@ export const content = Symbol('content');
 export const mode = Symbol('mode');
 export const host = Symbol('host');
 export const setURL = Symbol('setURL');
+export const localName = Symbol('localName');
+export const registedClass = Symbol('registedClass');

packages/happy-dom/src/browser/detached-browser/DetachedBrowserPage.ts

@@ -86,11 +86,12 @@ export default class DetachedBrowserPage implements IBrowserPage {
 				.then(() => {
 					// As we are in a detached page, a context or browser should not exist without a page as there are no references to them.
 					if (context.pages[0] === this) {
-						context.close();
+						context.close().then(resolve).catch(reject);
+					} else {
+						resolve();
 					}
-					resolve();
 				})
-				.catch((error) => reject(error));
+				.catch(reject);
 		});
 	}
 

packages/happy-dom/src/browser/utilities/BrowserFrameExceptionObserver.ts

@@ -34,6 +34,12 @@ export default class BrowserFrameExceptionObserver {
 				return;
 			}
 
+			if (!this.browserFrame.window) {
+				throw new Error(
+					'Browser frame was not closed correctly. Window is undefined on browser frame, but exception observer is still watching.'
+				);
+			}
+
 			if (
 				error instanceof this.browserFrame.window.Error ||
 				error instanceof this.browserFrame.window.DOMException
@@ -56,6 +62,12 @@ export default class BrowserFrameExceptionObserver {
 		// The "uncaughtException" event is not always triggered for unhandled rejections.
 		// Therefore we want to use the "unhandledRejection" event as well.
 		this.uncaughtRejectionListener = (error: unknown) => {
+			if (!this.browserFrame.window) {
+				throw new Error(
+					'Browser frame was not closed correctly. Window is undefined on browser frame, but exception observer is still watching.'
+				);
+			}
+
 			if (
 				error instanceof this.browserFrame.window.Error ||
 				error instanceof this.browserFrame.window.DOMException

packages/happy-dom/src/browser/utilities/BrowserFrameFactory.ts

@@ -41,18 +41,18 @@ export default class BrowserFrameFactory {
 				}
 			}
 
-			// We need to destroy the Window instance before triggering any async tasks as Window.close() is not async.
-			frame.window[PropertySymbol.destroy]();
-			(<IBrowserPage | null>frame.page) = null;
-			(<IBrowserWindow | null>frame.window) = null;
-			frame[PropertySymbol.openerFrame] = null;
-			frame[PropertySymbol.openerWindow] = null;
-
 			if (!frame.childFrames.length) {
 				return frame[PropertySymbol.asyncTaskManager]
 					.destroy()
 					.then(() => {
 						frame[PropertySymbol.exceptionObserver]?.disconnect();
+						if (frame.window) {
+							frame.window[PropertySymbol.destroy]();
+							(<IBrowserPage | null>frame.page) = null;
+							(<IBrowserWindow | null>frame.window) = null;
+							frame[PropertySymbol.openerFrame] = null;
+							frame[PropertySymbol.openerWindow] = null;
+						}
 						resolve();
 					})
 					.catch((error) => reject(error));
@@ -62,6 +62,13 @@ export default class BrowserFrameFactory {
 				.then(() => {
 					return frame[PropertySymbol.asyncTaskManager].destroy().then(() => {
 						frame[PropertySymbol.exceptionObserver]?.disconnect();
+						if (frame.window) {
+							frame.window[PropertySymbol.destroy]();
+							(<IBrowserPage | null>frame.page) = null;
+							(<IBrowserWindow | null>frame.window) = null;
+							frame[PropertySymbol.openerFrame] = null;
+							frame[PropertySymbol.openerWindow] = null;
+						}
 						resolve();
 					});
 				})

packages/happy-dom/src/config/HTMLElementLocalNameToClass.ts

@@ -0,0 +1,119 @@
+export default <{ [key: string]: string }>{
+	a: 'HTMLAnchorElement',
+	abbr: 'HTMLElement',
+	address: 'HTMLElement',
+	area: 'HTMLElement',
+	article: 'HTMLElement',
+	aside: 'HTMLElement',
+	audio: 'HTMLAudioElement',
+	b: 'HTMLElement',
+	base: 'HTMLBaseElement',
+	bdi: 'HTMLElement',
+	bdo: 'HTMLElement',
+	blockquaote: 'HTMLElement',
+	body: 'HTMLElement',
+	template: 'HTMLTemplateElement',
+	form: 'HTMLFormElement',
+	input: 'HTMLInputElement',
+	textarea: 'HTMLTextAreaElement',
+	script: 'HTMLScriptElement',
+	img: 'HTMLImageElement',
+	link: 'HTMLLinkElement',
+	style: 'HTMLStyleElement',
+	label: 'HTMLLabelElement',
+	slot: 'HTMLSlotElement',
+	meta: 'HTMLMetaElement',
+	blockquote: 'HTMLElement',
+	br: 'HTMLElement',
+	button: 'HTMLButtonElement',
+	canvas: 'HTMLElement',
+	caption: 'HTMLElement',
+	cite: 'HTMLElement',
+	code: 'HTMLElement',
+	col: 'HTMLElement',
+	colgroup: 'HTMLElement',
+	data: 'HTMLElement',
+	datalist: 'HTMLElement',
+	dd: 'HTMLElement',
+	del: 'HTMLElement',
+	details: 'HTMLElement',
+	dfn: 'HTMLElement',
+	dialog: 'HTMLDialogElement',
+	div: 'HTMLElement',
+	dl: 'HTMLElement',
+	dt: 'HTMLElement',
+	em: 'HTMLElement',
+	embed: 'HTMLElement',
+	fieldset: 'HTMLElement',
+	figcaption: 'HTMLElement',
+	figure: 'HTMLElement',
+	footer: 'HTMLElement',
+	h1: 'HTMLElement',
+	h2: 'HTMLElement',
+	h3: 'HTMLElement',
+	h4: 'HTMLElement',
+	h5: 'HTMLElement',
+	h6: 'HTMLElement',
+	head: 'HTMLElement',
+	header: 'HTMLElement',
+	hgroup: 'HTMLElement',
+	hr: 'HTMLElement',
+	html: 'HTMLElement',
+	i: 'HTMLElement',
+	iframe: 'HTMLIFrameElement',
+	ins: 'HTMLElement',
+	kbd: 'HTMLElement',
+	legend: 'HTMLElement',
+	li: 'HTMLElement',
+	main: 'HTMLElement',
+	map: 'HTMLElement',
+	mark: 'HTMLElement',
+	math: 'HTMLElement',
+	menu: 'HTMLElement',
+	menuitem: 'HTMLElement',
+	meter: 'HTMLElement',
+	nav: 'HTMLElement',
+	noscript: 'HTMLElement',
+	object: 'HTMLElement',
+	ol: 'HTMLElement',
+	optgroup: 'HTMLOptGroupElement',
+	option: 'HTMLOptionElement',
+	output: 'HTMLElement',
+	p: 'HTMLElement',
+	param: 'HTMLElement',
+	picture: 'HTMLElement',
+	pre: 'HTMLElement',
+	progress: 'HTMLElement',
+	q: 'HTMLElement',
+	rb: 'HTMLElement',
+	rp: 'HTMLElement',
+	rt: 'HTMLElement',
+	rtc: 'HTMLElement',
+	ruby: 'HTMLElement',
+	s: 'HTMLElement',
+	samp: 'HTMLElement',
+	section: 'HTMLElement',
+	select: 'HTMLSelectElement',
+	small: 'HTMLElement',
+	source: 'HTMLElement',
+	span: 'HTMLElement',
+	strong: 'HTMLElement',
+	sub: 'HTMLElement',
+	summary: 'HTMLElement',
+	sup: 'HTMLElement',
+	table: 'HTMLElement',
+	tbody: 'HTMLElement',
+	td: 'HTMLElement',
+	tfoot: 'HTMLElement',
+	th: 'HTMLElement',
+	thead: 'HTMLElement',
+	time: 'HTMLElement',
+	title: 'HTMLElement',
+	tr: 'HTMLElement',
+	track: 'HTMLElement',
+	u: 'HTMLElement',
+	ul: 'HTMLElement',
+	var: 'HTMLElement',
+	video: 'HTMLVideoElement',
+	wbr: 'HTMLElement'
+};

packages/happy-dom/src/config/NamespaceURI.ts

@@ -1,5 +1,6 @@
 export default {
 	html: 'http://www.w3.org/1999/xhtml',
 	svg: 'http://www.w3.org/2000/svg',
-	mathML: 'http://www.w3.org/1998/Math/MathML'
+	mathML: 'http://www.w3.org/1998/Math/MathML',
+	xmlns: 'http://www.w3.org/2000/xmlns/'
 };