Bug 1085214 Comment 37 Edit History

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Original comment by
on 
Returning an empty array could work only for top-level frames as an empty `window.location.ancestorOrigins` could be used as clue no valid ancestor frames are present for subframes.

Returning an array with one or more `window.location.origin` would only work if the whole frame subtree is same-origin. Otherwise false information would be given to frames.
Revision 1 by
on 
Returning an empty array could work only for top-level frames as an empty `window.location.ancestorOrigins` could be used as clue no valid ancestor frames are present for subframes.

Returning an array with one or more `window.location.origin` would only work if the whole frame subtree is same-origin. Otherwise false information would be given to frames.

In all other scenarios it seems best to keep `window.location.ancestorOrigins` undefined until an implementation is ready and supported.

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