XHTML survives in ePub. Recently there was a survey to gather industry feedback for a potential addition of an HTML flavour of ePub to be added to the next vers

XHTML survives in ePub. Recently there was a survey to gather industry feedback for a potential addition of an HTML flavour of ePub to be added to the next version of the spec, but it soon became fairly clear that people saw a lot of value in remaining XHTML-only: https://www.w3.org/blog/2026/epub-and-html-survey-results-and-next-steps/ https://www.w3.org/blog/2026/epub-and-html-survey-results-an...