getElementById on element within an iframe

Question

My current code works on elements outside of an iframe. How should I approach fetching elements within an iframe using getElementById? My end goal is to write text within th

Answer 1

Also another way would be to get url of that iframe and load that into your browser.

For me accepted solution is giving "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))" error.