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I recently moved Gecko's window.external implementation to WebIDL, and during that realized that the Window.external property currently in the spec is not [Replaceable]. But that is not Web compatible, testing with Gecko and Blink. So I think we should make this property as [Replaceable].
Do you have a test case showing what you mean?
http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=2908 Note that the log says "5", not [object External].
Thanks.
Checked in as WHATWG revision r8601. Check-in comment: match reality: window.external is [Replaceable] http://html5.org/tools/web-apps-tracker?from=8600&to=8601