[dragonwriter]

EPUB 3.x spec uses “XHTML” to refer to the XML serialization of HTML in the current WHATWG HTML living standard, not the separate historical standard from HTML known as XHTML.

The obsolete EPUB 2.x (and earlier, I believe) specs actually used XHTML (XHTML 1.1 in EPUB 2.x), though.

[mgr86]

Thanks for that update. I had worked with epub production in the past, but it was probably nearly 15 years ago at this point.