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\setupbodyfont[dejavu]

\startluacode
    fonts.handlers.otf.addfeature {
        name = "singletest",
        type = "single",
        data = {
            B = { -30, 0, -50, 0 },
        }
    }
\stopluacode

\starttext

\definecolor[tgray][s=.5,t=.5,a=1] \showfontkerns \showglyphs

\definefontfeature[singletest] [mode=node,singletest=yes]

\definedfont[file:dejavu-serif.ttf*singletest @ 48pt]

\startTEXpage[offset=10pt,foregroundcolor=tgray]
    ABCDEF
\stopTEXpage

\stoptext