We’ve noticed that EPUB files exported from Pressbooks seem to get the same errors in ACE Accessibility Checker. The files validate in EPUB-Checker with no errors. Our current project uses McLuhan:
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Language isn’t specified (book.opf) - the language designation is in the metadata, but not declared for package.
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Language attribute is missing (toc.xhtml)
<html xmlns="XHTML namespace" xmlns:epub="``http://www.idpf.org/2007/ops``"> -
ARIA role errors in toc and copyright pages
I’m able to fix the errors in Sigil, but the untouched exported EPUB file available for download on our book page will have these errors. Since they are in the opf, toc, and copyright pages — all produced by Pressbooks, is there anything we can do to prevent this?