Matt Garrish

FYI, I just made a test to check if a local resource would get flagged (in the [testing branch](https://github.com/w3c/epubcheck/blob/test/reporting/src/test/resources/epub3/05-package-document/package-document.feature#L330)), but there isn't an error in the beta-2 release.

The epub spec says that any video resource can be referenced without fallback; nothing restricts where you can reference videos from. So, I'd hazard this is an epubcheck bug. The...

> In that particular case, is it even valid HTML to put some `video/mp4` in there? HTML doesn't restrict the media type, so it's primarily a question of support, no?...

> I don't think IDNs are disallowed in EPUB No, 3.2 references RFC3987 which allows most Unicode characters outside the PUAs (and even those in query strings). The URL standard...

This requirement was further changed in https://github.com/w3c/epub-specs/pull/1648 The new prose is: "All File Names within the same directory MUST be unique following Unicode normalization [UAX15] and then full case folding...

It's not restricted to one instance in the specification, so it's not an epubcheck error. For Ace, maybe if the summaries don't have different language/direction declarations we could issue a...

Apple could be using an older version of epubcheck still and/or they've added extra rules on their incoming content that don't exist in the standard. If you want to validate...

> EPUB 3.2 is based on the latest HTML version, defined by in the [HTML living standard](https://www.w3.org/TR/html/) Right, W3C have an [MOU with whatwg](https://www.w3.org/2019/04/WHATWG-W3C-MOU.html) now that the living standard will...

> dublicate ids in `section ` elements in two different xhtml docs That's only a problem when an ID is duplicated in the same file as it breaks the ability...

Wouldn't this have to be an error because you can only navigate to publication resources that are listed in the spine (and by extension the manifest)? The same applies to...