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http://www.whatwg.org/specs/web-apps/current-work/multipage/browsers.html#named-access-on-the-window-object Window object has named properties which allows access to frame objects. But frames inside shadows should be hidden from the accessor. We need to mention about that.
Oops, missed that one. Thanks! http://dvcs.w3.org/hg/webcomponents/rev/31aedc1aea0a