Provide rendering for `<ref>` (and `<ptr>`?) to make links clickable
Done: https://github.com/EpiDoc/Stylesheets/commit/6e2488a561b7967479583214db5e6b9d7545e7ab
ligature display for more than 2 letters
Done: https://github.com/EpiDoc/Stylesheets/commit/ae110abf43ae6094a9b7dc68a1c679eaf51e12eb
InsLib uses an approach with ligatures that are generated via CSS, see e.g. the files global.css and htm-teihi.xsl in this commit: https://github.com/EpiDoc/Stylesheets/commit/8ec6c9f7250bf6e9d57bface0dc4ff7057e9438f
Provide rendering for `<ref>` (and `<ptr>`?) to make links clickable
Text direction: GL and XSL need improving
Demo XSLT template