On Sat, 1 Feb 2020 17:59:57 -0800 Roozbeh Pournader via Unicode <unicode@unicode.org> wrote:
> They are actually allowed on combining marks of ccc=0. We even define > one such variation sequence for Myanmar, IIRC. > > On Sat, Feb 1, 2020, 2:12 PM Richard Wordingham via Unicode < > unicode@unicode.org> wrote: > > > Why are variation selectors not allowed for combining marks? I can > > see a reason for them not being allowed on characters with non-zero > > canonical combining classes, but not for them being prohibited for > > combining marks that are starters, i.e. have ccc=0. Ah, I missed that change from Version 5.0, where the restriction was, 'The base character in a variation sequence is never a combining character or a decomposable character'. I now need to rephrase the question. Why are marks other than spacing marks prohibited? Richard.