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I just noticed this in the trunk/dev channel:
type ( enumerated string ["normal", "popup", "panel", "app", "shell"] )The type of browser window this is.
I tried it with with Canary: no window is shown, but we have console output, so something has been created. The thing is I just don't get it. How is this different from a background page?
I was hoping to toggle windows completely out of the user's view, without having to reload the window's content when toggling up. Anyway, I'm not hoping much as you can't update a window type with chrome.windows.update. But the question still remains: what is this "shell" type?
"shell" moved to the new chrome.app.window API in r140947. Then it appears to have disappeared from there in the dev documentation.
"shell" currently does nothing for extensions and should not be used.