Source Browser ?

1\setupbodyfont[dejavu]
2
3\startluacode
4    fonts.handlers.otf.addfeature {
5        name = "singletest",
6        type = "single",
7        data = {
8            B = { -30, 0, -50, 0 },
9        }
10    }
11\stopluacode
12
13\starttext
14
15\definecolor[tgray][s=.5,t=.5,a=1] \showfontkerns \showglyphs
16
17\definefontfeature[singletest] [mode=node,singletest=yes]
18
19\definedfont[file:dejavu-serif.ttf*singletest @ 48pt]
20
21\startTEXpage[offset=10pt,foregroundcolor=tgray]
22    ABCDEF
23\stopTEXpage
24
25\stoptext
26