> > Unicode's canonical ordering of Hebrew marks is based on their combining
> > classes, with characters in higher combining classes being sorted after
> > those with lower combining classes in canonical order. The
> > typographically recommended ordering of certain characters is found in
> > Table 1 (p. 12) of
> > https://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf. The
> So how official is that? Or is this something specific for this font?
Hebrew Layout Intelligence, which was developed by John Hudson of Tiro Typeworks (who wrote this manual) and Ralph Hancock, is used for mark positioning by a number of Hebrew fonts. Its guidelines govern their glyph classes and chaining substitution rules. The fonts I know of that explicitly implement it are SBL Hebrew, Ezra SIL, Keter YG, Keter Aram Tsova.