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See bug 21946 comment 31.
The prose is ok as is, right? Even with "WindowProxy?" changed to "any"?
Yep, the same prose is fine.
Fixed. I really should have tested that better in bug 21946, sorry about that.
Checked in as WHATWG revision r8652. Check-in comment: Turns out window.opener is set to all kinds of crazy things and we shouldn't fire TypeError for them http://html5.org/tools/web-apps-tracker?from=8651&to=8652