Update back.html

back.html

@@ -40,12 +40,9 @@ height: 100%;
 <iframe 
   id="myIframe" 
   frameborder="0" 
-  allowfullscreen="true" 
-  webkitallowfullscreen="true" 
-  mozallowfullscreen="true" 
-  oallowfullscreen="true" 
-  msallowfullscreen="true">
-</iframe>
+  allow="accelerometer; ambient-light-sensor; autoplay; battery; camera; document-domain; encrypted-media; fullscreen; geolocation; gyroscope; layout-animations; legacy-image-formats; magnetometer; microphone; midi; oversized-images; payment; picture-in-picture; publickey-credentials-get; sync-xhr; usb; vr ; wake-lock; xr-spatial-tracking" 
+  sandbox="allow-forms allow-modals allow-popups allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-downloads"
+></iframe>
 </div>
     <script>
     const queryString = window.location.search;