I care very much about ebooks and readability. One stunning failure of current ePub technology is the lack of publication-quality justification and microtypogr

I care very much about ebooks and readability. One stunning failure of current ePub technology is the lack of publication-quality justification and microtypography. Currently, PDF authors are overloading "Tagged PDF" annotations, which were initially designed for accessibility features such as high contrast, large text, or screen reader (text-to-speech) document flow. It's not a general solution to reflowable PDF output, but it's better than nothing, perhaps. Adobe realizes that such additional markup does nothing for the vast universe of existing PDFs. They have trained an AI model to infer document structure and create the tags on the fly; the marketing term for this is called "Liquid Mode" in recent versions of Adobe Acrobat Reader. I'd like to see a reflow engine in TeX, and there are some good implementations https://hint.userweb.mwn.de/hint/format.html https://hint.userweb.mwn.de/hint/format.html The CSS Text Level 4 has a `text-align: auto` attribute. They point out that text layout is complicated, various human languages and scripts have different approaches to adjusting text width, some of which can be generalized. https://www.w3.org/International/articles/typography/justification https://www.w3.org/International/articles/typography/justifi...