\part{\LuaTeX-only font features} \label{sec:luatex-features} \section{Custom font features} Pre-2016, it was possible to load an OpenType font feature file to define new OpenType features for a selected font. This facility was particularly useful to implement custom substitutions, for example. As of \TeX{}Live~2016, \LuaTeX/\pkg{luaotfload} no longer supports this feature, but provides its own internal mechanisms for an equivalent interface. Any documents using `feature file' options will need to transition to the new interface. Figure~\ref{fig:featurefile} shows an example. Please refer to the \LuaTeX/\pkg{luaotfload} documentation for more details. \begin{figure} \caption{An example of custom font features.} \label{fig:featurefile} \hrule \begin{Verbatim} \documentclass{article} \usepackage{fontspec} \directlua{ fonts.handlers.otf.addfeature { name = "oneb", type = "substitution", data = { ["1"] = "one.ss01", } } } \setmainfont{Vollkorn-Regular.otf}[RawFeature=+oneb] \begin{document} 1234567890 \end{document} \end{Verbatim} \hrule \end{figure}