Inner document of iframe is null

[zarazek]

I'm getting null when accessing document property of iframe. The same code on Firefox works correctly (it returns HTMLDocument object).
test.zip

[KiChjang]

Can you show us the JS code that you've used to access the document property? My guess is that the iframe is cross-origin, which we don't support yet.

[zarazek]

I attached the file with html and js code to the first comment.

[jdm]

Yes, this behaves as described when run from a file:// URL (where every URL is cross-origin), but works as expected when run from an http:// URL (where the iframe is same-origin). This is a symptom of #15233, so I'll close it in favour of that. Thanks for reporting it!