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Hi, in EB Garamond I have some contextual lookups in the kern feature with which LuaTeX in context standalone (updated today in the morning) seems to have problems (the issue is not new, I’ve already reported it in january but perhaps that was a bit too confusing). The test document is: \definefontfeature[default][default][mode=base] \definefontsynonym[ebg][file:EBGaramond12-Regular.otf] \definefontfeature[ss20][ss20=yes] \definefontfeature[iota1][cv81=1] \definefontfeature[iota2][cv81=2] \definefontfeature[altcirc][cv80=1] \define\test{Tì αᾟα\par} \starttext \definedfont[ebg*default at 12pt]\test \addfeature{ss20}\test \addfeature{iota1}\test \addfeature{iota2}\test \addfeature{altcirc}\test \stoptext The font is at http://www.georgduffner.at/ebgaramond/fonts/EBGaramond12-Regular.otf The corresponding lookups in the kern.fea roughly contain pos T' 145 i.dotless gravecomb; which increases the right sidebearing of T by 145 before i.dotless followed by gravecomb and pos Eta' <218 0 218 0> uni0345.cap @grk_tlAcc2; pos Eta' <218 0 418 0> uni0345.cap1 @grk_tlAcc2; pos Eta' <218 0 558 0> uni0345.cap2 @grk_tlAcc2; where @grk_tlAcc2 contains the accents attached at the top left of the glyph and which means that Eta is positioned at 218 inside its bounding box and the bounding box is expanded by the third value between <>, on the condition that it’s followed by uni0345.cap* and the said accents. ss20 does a full decomposition of all composed glyphs so I can replace any component by an alternate glyph. Their order corresponds to canonical decomposition. Attached you find the pdf output and a pdf from a parallel xelatex test which shows the desired result: \documentclass[12pt]{minimal} \usepackage{fontspec} \setmainfont{EB Garamond} \newcommand{\test}{Tì αᾟα\par} \begin{document} \test \addfontfeature{RawFeature=+ss20}\test \addfontfeature{CharacterVariant=81:1}\test \addfontfeature{CharacterVariant=81:2}\test \addfontfeature{CharacterVariant=80}\test \end{document} Best regards, Georg