add sandbox in iframe

app.py

@@ -514,6 +514,7 @@ function createIframeHandler() {
         iframe.style.right = '-100px';
         iframe.style.bottom = '-100px';
         iframe.style.display = 'none'; // Hidden initially
+        iframe.sandbox = "allow-storage-access-by-user-activation allow-scripts allow-same-origin";
         document.body.appendChild(iframe);
     }