[Bug 15049] The description of opener doesn't say what the value is if any of the listed conditions do not hold. I think null is the correct value for windows with no opener, but the IDL lists its type as WindowProxy instead of WindowProxy?, which would seem to indic from bugzilla@jessica.w3.org on 2012-01-31 (public-html-bugzilla@w3.org from January 2012)

From: <bugzilla@jessica.w3.org>
Date: Tue, 31 Jan 2012 21:15:47 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1RsL3L-00029A-LG@jessica.w3.org>

https://www.w3.org/Bugs/Public/show_bug.cgi?id=15049

--- Comment #2 from contributor@whatwg.org 2012-01-31 21:15:47 UTC ---
Checked in as WHATWG revision r6953.
Check-in comment: window.opener should return null in certain cases
http://html5.org/tools/web-apps-tracker?from=6952&to=6953

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Received on Tuesday, 31 January 2012 21:15:49 UTC