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The cover is the first image reached by EPUB 3's cover-image property, EPUB 2's <meta name="cover"> (by id, or by address where a converter wrote one), the guide's cover page and the first <img> or SVG <image> on it, and last any manifest image whose id or address says cover. A route that names something unusable leaves a note and the next is asked. Addresses are resolved against the document they are written in, with the fragment off and percent-escapes undone; one that climbs out of the archive or carries a scheme is not followed. Every member is read through a bound, checked against the size the archive declares and enforced on the read itself, so an understated entry stops at the cap too. The media type is read off the bytes, now WebP as well, and a manifest that disagrees is a note; bytes that are not an image are no cover. MAX_COVER (16 MiB) is the cap for both formats, so a Kindle cover record larger than that is left out as well.