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here we add an event listener to the window object that fires when the storage object associated with the current origin is changed. as you can see above, the event object associated with this event has a number of properties containing useful information — the key of the data that changed, the old value before the change, the new value after that change, the url of the document that changed the storage, and the storage object itself (which we've stringified so you can see its content). containing useful information — the key of the data that changed, the old value before the change, the new value after that change, the url of the document.