Comment by danpalmer
19 hours ago
> Epubcheck does basic CSS checking of course, but it can’t validate CSS against a renderer which is fundamentally broken!
But isn't that kind of the point of epubcheck? It's surely not intended to validate all of CSS, it's intended to validate that an epub will work... and not working on Kobo devices (probably #2 manufacturer of ebook readers?) is a major issue.
epubcheck is meant to ensure conformance with the standards, not the interoperably implemented subset of the standards. (Which has lots of awkward questions: which implementations of the standards, which versions of those implementations, etc.)
The latter seems like what the tool's users actually want. That it's a harder problem doesn't change that.
The user wants the website to work in IE6, developing and testing only against IE6 to the detriment of other browsers is not generally regarded as a healthy state of affairs.
The standard exists, it is the responsibility of both the producer and consumer of ePUB files to adhere to the standard.
https://en.wikipedia.org/wiki/Robustness_principle
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No, the users need to be able to check for conformance. What we also need is for vendors to supply test platforms. Amazon, to its small credit, does this, which is good, because the subset of html/css they support is limited and poorly documented. Heck, I'd be happy if Apple, Kobo, and everyone else just kept good documentation and up to date!
Though these days I have to spend more time worrying about EAA and ADA compliance than anything else.
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