[NTG-context] change width of a character with fonts.handlers.otf.addfeature

19 May 2017

      In extensions-001.tex
(http://minimals.metatex.org/current/context/test/doc/context/tests/mkiv/font...) 
there is an example how to add or change the kern between two chars:

    fonts.handlers.otf.addfeature {
        name = "ktest",
        type = "kern",
        data = {
            a = { b = -500 },
        }
    }

Can this be used to implement also a "Single adjustment positioning" 
which would effectivly change the width of character? 

(http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html#6....)

(I tried a few probable variants but got either errors or no effect
at all).

-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/