packages/happy-dom/src/nodes/document/Document.ts

@@ -63,6 +63,7 @@ export default class Document extends Node implements IDocument {
 	public readonly readyState = DocumentReadyStateEnum.interactive;
 	public readonly isConnected: boolean = true;
 	public readonly defaultView: IWindow;
+	public readonly referrer = '';
 	public readonly _windowClass: {} | null = null;
 	public readonly _readyStateManager: DocumentReadyStateManager;
 	public readonly _children: IHTMLCollection<IElement> = new HTMLCollection<IElement>();

packages/happy-dom/src/nodes/document/IDocument.ts

@@ -46,6 +46,7 @@ export default interface IDocument extends IParentNode {
 	readonly visibilityState: VisibilityStateEnum;
 	readonly hidden: boolean;
 	readonly links: IHTMLCollection<IHTMLElement>;
+	readonly referrer: string;
 	cookie: string;
 	title: string;
 

packages/happy-dom/test/nodes/document/Document.test.ts

@@ -66,6 +66,12 @@ describe('Document', () => {
 		});
 	}
 
+	describe('get referrer()', () => {
+		it('Returns empty string.', () => {
+			expect(document.referrer).toBe('');
+		});
+	});
+
 	describe('get nodeName()', () => {
 		it('Returns "#document".', () => {
 			expect(document.nodeName).toBe('#document');