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Indeed, the browser's IndexedDB storage works as a temporary cache that is managed automatically. This means that while you can't specifically choose which books to keep or remove, the browser will usually maintain the data of recently accessed books while discarding older data when storage space becomes limited.
If you're worried about storage space, one way to manage this might be to manually clear your browser cache periodically. However, remember that this would also remove all cached books, and you'd have to redownload them for offline reading.
Also, as @nqk suggested, using an alternative browser like Fully Kiosk that supports caching could be a beneficial workaround for reading offline.
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