Q:

how can i inspect(document.body) in js while loading the page using object?

i tried to load the page using XMLHttpRequest() but i got 

blocked by CORS policy: No 'Access-Control-Allow-Origin' header is
  present on the requested resource

so i tried to load the page using something else so i used 
object type="text/html" data="http://page/"></object>

it loaded the page in a small box .
so i tried to define the page code to a constant so i be able to find a value from it's code using
let str = document.querySelector("body")

but it selected my page body not the page loaded using object .
i tried the querySelector because 
document.documentElement.innerHTML

have the same problem. if there a way to inspect elements to the correct page it would solve this .
the page and console before inspecting the wanted area manually 

the page and console after inspecting the wanted area manually

note: i can't edit the requested page 

A:

You can't because objects ( Iframses ) have the cross domain policy too 

