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See the chart at [1]. It looks like |opener| is the one property that all UAs support cross-origin but the spec doesn't. [1] https://bug839867.bugzilla.mozilla.org/attachment.cgi?id=712247
How about blur(), close(), focus(), and .closed?
Checked in as WHATWG revision r7941. Check-in comment: Example window.opener cross-origin. http://html5.org/tools/web-apps-tracker?from=7940&to=7941
(In reply to comment #1) > How about blur(), close(), focus(), and .closed? Oh yeah. Missed those.
Checked in as WHATWG revision r7977. Check-in comment: Define window.close; update the list of members exposed cross-origin on Window to match reality http://html5.org/tools/web-apps-tracker?from=7976&to=7977