[Bug 15597] Nothing seems to say when contentDocument or contentWindow are null. It should say they're null if there's no nested browsing context, or similar.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=15597

--- Comment #2 from contributor@whatwg.org 2012-02-07 01:00:03 UTC ---
Checked in as WHATWG revision r6976.
Check-in comment: Say when iframes' contentDocument and contentWindow
attributes return null.
http://html5.org/tools/web-apps-tracker?from=6975&to=6976

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