diff --git a/src/auto-reply/reply/export-html/template.security.test.ts b/src/auto-reply/reply/export-html/template.security.test.ts
index 8a2844af32d..981289f0dea 100644
--- a/src/auto-reply/reply/export-html/template.security.test.ts
+++ b/src/auto-reply/reply/export-html/template.security.test.ts
@@ -30,11 +30,7 @@ type SessionData = {
 type ParsedHtml = {
   document: Document;
   window: {
-    HTMLElement?: {
-      prototype?: {
-        scrollIntoView?: () => void;
-      };
-    };
+    HTMLElement?: unknown;
   };
 };
 
@@ -59,6 +55,34 @@ async function loadParseHTML(): Promise<LinkedomModule["parseHTML"]> {
   return parseHtmlPromise;
 }
 
+function installScrollIntoViewStub(document: Document) {
+  const patchElement = <T extends Element | null>(element: T): T => {
+    if (element && !("scrollIntoView" in element)) {
+      Object.defineProperty(element, "scrollIntoView", {
+        configurable: true,
+        value: () => {},
+      });
+    }
+    return element;
+  };
+
+  for (const element of document.querySelectorAll("*")) {
+    patchElement(element);
+  }
+
+  const getElementById = document.getElementById.bind(document);
+  document.getElementById = ((id: string) =>
+    patchElement(getElementById(id))) as typeof document.getElementById;
+
+  const querySelector = document.querySelector.bind(document);
+  document.querySelector = ((selectors: string) =>
+    patchElement(querySelector(selectors))) as typeof document.querySelector;
+
+  const createElement = document.createElement.bind(document);
+  document.createElement = ((tagName: string, options?: ElementCreationOptions) =>
+    patchElement(createElement(tagName, options))) as typeof document.createElement;
+}
+
 async function renderTemplate(sessionData: SessionData) {
   const html = templateHtml
     .replace("{{CSS}}", "")
@@ -69,8 +93,8 @@ async function renderTemplate(sessionData: SessionData) {
 
   const parseHTML = await loadParseHTML();
   const { document, window } = parseHTML(html);
-  if (window.HTMLElement?.prototype) {
-    window.HTMLElement.prototype.scrollIntoView = () => {};
+  if (window.HTMLElement) {
+    installScrollIntoViewStub(document);
   }
 
   const immediateTimeout = (fn: (...args: unknown[]) => void) => {
diff --git a/src/infra/gaxios-fetch-compat.test.ts b/src/infra/gaxios-fetch-compat.test.ts
index 60934c040f0..b3714d80af3 100644
--- a/src/infra/gaxios-fetch-compat.test.ts
+++ b/src/infra/gaxios-fetch-compat.test.ts
@@ -47,7 +47,10 @@ describe("gaxios fetch compat", () => {
 
     vi.stubGlobal("fetch", fetchMock);
     class MockGaxios {
-      _defaultAdapter!: (config: MockRequestConfig) => Promise<Response>;
+      async _defaultAdapter(config: MockRequestConfig): Promise<Response> {
+        const fetchImplementation = config.fetchImplementation ?? fetch;
+        return await fetchImplementation(config.url, config);
+      }
 
       async request(config: MockRequestConfig) {
         const response = await this._defaultAdapter(config);
@@ -59,10 +62,6 @@ describe("gaxios fetch compat", () => {
     }
     MockGaxiosCtor = MockGaxios;
 
-    MockGaxios.prototype._defaultAdapter = async (config: MockRequestConfig) => {
-      const fetchImplementation = config.fetchImplementation ?? fetch;
-      return await fetchImplementation(config.url, config);
-    };
     (globalThis as Record<string, unknown>)[TEST_GAXIOS_CONSTRUCTOR_OVERRIDE] = MockGaxios;
 
     await installGaxiosFetchCompat();