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EPUB 3.3
https://www.w3.org/TR/epub
… non-normative. EPUB 3 has been widely adopted as the format for digital books (ebooks), and this revision continues to increase the format's capabilities to better support a wider range of publication requirements, including complex layouts, rich media and interactivity, and glo…
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EPUB 3.3
https://www.w3.org/TR/epub-33
… non-normative. EPUB 3 has been widely adopted as the format for digital books (ebooks), and this revision continues to increase the format's capabilities to better support a wider range of publication requirements, including complex layouts, rich media and interactivity, and glo…