Cookies and local storage
The storage used to sign you in and save your offline book.
Essential sign-in cookies
Collector sign-in uses a secure HttpOnly session cookie. The application does not add advertising or analytics cookies.
Device storage
The offline-book feature uses the browser’s cache and local storage to retain a read-only book you explicitly save. The offline service worker serves that saved copy when the connection is unavailable. Browser and WebGL caches may retain web images and application files.
Your controls
You can remove an offline book from your account page. Signing out also clears the saved offline book on that device. You can clear site data using browser settings; this will not delete your centrally saved collection.