The official EPUB checker. A @w3c project, maintained by the DAISY Consortium @accessibledaisy

Joined October 2018
📢 EPUBCheck v4.2.6 is now available! 👉 github.com/w3c/epubcheck/rel… It reverts two checks introduced in v4.2.5: - 'role' metadata can be attached more than once to 'creator', 'contributor' and now 'publisher' too - Media Overlays need not follow content order #epub #eprdctn
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You only need to update if your were impacted by these issues! (we always recommend to keep updated, but understand it has an overhead cost 😊) Reverting these checks is a proactive adoption of the relaxed rules of EPUB 3.3 😎
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Do you have questions or comments about Bidi?
For review: Use cases for bidi and language metadata on the Web w3c.github.io/i18n-drafts/ar… We are looking for comments by Thursday 11 March. Comments via GitHub, please. github.com/w3c/i18n-drafts/i…
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📢 EPUBCheck v4.2.4 is now available! 👉 github.com/w3c/epubcheck/rel… It's a patch to v4.2.3 which was released yesterday (sorry for the inconvenience 😊😅). HTML schemas are now in sync with ARIA in HTML, for better DPUB ARIA support! Thanks to @MattGarrish 👍 #epub #eprdctn
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If you ever needed a list of epubcheck messages, made this yesterday evening: jaypanoz.github.io/epubcheck… (with sortable tables) More than willing to transfer the GitHub repo to someone with the bandwidth for maintaining it though.
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📢 EPUBCheck v4.2.2 (maintenance release) is now available 👉 github.com/w3c/epubcheck/rel… - reverts the rule about nav toc and page-list being in spine order to a WARNING. - features complete translation to Traditional Chinese (thanks David Lee!) #epub #eprdctn
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EPUB 3.2 is now published as a final specification! 🎉It's time to upgrade your validation to EPUBCheck 4.2.0, if you haven't already! #epub #eprdctn
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**edit**: EPUBCheck 4.2.1 is now the latest production-ready release. If in doubt, always pick the version labelled "latest release" on our release page! github.com/w3c/epubcheck/rel…
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EPUBCheck localization: we'll freeze the translations on April 16, to integrate them in the final v4.2.0 release. Contributors please mark the date 📆, and thank you so much for your help! ❤️
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Do you want to help us and test v4.2.0-RC? @wendy_a_reid created a useful script to run EPUBCheck on a batch of files 🚀❤️ 👉 github.com/wareid/EPUB3-test…
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