I think you are missing the point. Several businesses have been sued over not meeting accessibility requirements, the Americans for Disabilities Act. It will happen.
But regardless - EPUB specifically allows for the abbr tag, it is part of HTML5 and epubcheck validates the content.
WCAG not only dates back to 90s, but WCAG 2 is an ISO/IEC standard.
If an ePub reader breaks because a standard compliant tag that is part of complying with a 7 year old ISO standard, the problem is that epub reader, not the use of the tag.
I know a lot of people think those with disabilities are a burden on society and don't like catering to them, but I refuse to be part of a community that makes their anti-disability bias so blatant.
So this is the last you will hear from me.
Please rethink your position.
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