[Webkit-unassigned] [Bug 236624] Document.write into iframe with CSP sometimes blocks resources loads in inner iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236624

--- Comment #2 from Matt Bierner <matb at microsoft.com> ---
Over on Chrome, we determined this is likely by-design (although quite confusing): https://bugs.chromium.org/p/chromium/issues/detail?id=1297377

The issue with the polling here is that the iframe document may still be on `about:blank` when the ready state is first checked. This results in the new content written into the document inheriting the parent page's CSP instead of providing its own

To fix this, I added a check to our code to make sure we are checking the ready state of the expected page instead of `about:blank`

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