The app: URI scheme - 1 views
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on Unix systems, naive implementations expose the username as part of the path, as well as the full path on the file system to where a file is residing (e.g., "/Users/username/app/index.html").
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an application developer could use a UUID to personally identify a user
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This can allow a developer to, for example, restore cookies even if the user has cleared cookies from a user agent.