From 7442c8d3f4da5a7f7c571c1997265b3b804224c9 Mon Sep 17 00:00:00 2001
From: David Ortner <david@ortner.se>
Date: Thu, 30 May 2024 01:04:12 +0200
Subject: [PATCH] chore: [#1451] Continue on implementation

---
 .../src/browser/utilities/BrowserFrameFactory.ts     | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packages/happy-dom/src/browser/utilities/BrowserFrameFactory.ts b/packages/happy-dom/src/browser/utilities/BrowserFrameFactory.ts
index 2fb4bd18..7400b8ee 100644
--- a/packages/happy-dom/src/browser/utilities/BrowserFrameFactory.ts
+++ b/packages/happy-dom/src/browser/utilities/BrowserFrameFactory.ts
@@ -42,6 +42,12 @@ export default class BrowserFrameFactory {
 			}
 
 			if (!frame.childFrames.length) {
+				if (frame.window && frame.window[PropertySymbol.mutationObservers]) {
+					for (const mutationObserver of frame.window[PropertySymbol.mutationObservers]) {
+						mutationObserver.disconnect();
+					}
+					frame.window[PropertySymbol.mutationObservers] = [];
+				}
 				return frame[PropertySymbol.asyncTaskManager]
 					.destroy()
 					.then(() => {
@@ -60,6 +66,12 @@ export default class BrowserFrameFactory {
 
 			Promise.all(frame.childFrames.slice().map((childFrame) => this.destroyFrame(childFrame)))
 				.then(() => {
+					if (frame.window && frame.window[PropertySymbol.mutationObservers]) {
+						for (const mutationObserver of frame.window[PropertySymbol.mutationObservers]) {
+							mutationObserver.disconnect();
+						}
+						frame.window[PropertySymbol.mutationObservers] = [];
+					}
 					return frame[PropertySymbol.asyncTaskManager].destroy().then(() => {
 						frame[PropertySymbol.exceptionObserver]?.disconnect();
 						if (frame.window) {