HTML <iframe> sandbox for attached url via iframe

We need to display emails and we are attaching url via iframe. We do not have control over the contents of emails displayed, some may contain unwanted/malicious behavior.

How can we use the HTML

It seems that using something like “myLayout.cells(“a”).attachURL(”…/common/test_page_1.html");" we cannot have the wanted result of

Thank you

You may try to attach the required html-string to you layout cell.
Something like: