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+
+
+\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",
+ },
+ },
+ "feature oneb for vollkorn font",
+ }
+}
+\setmainfont{Vollkorn-Regular.otf}[RawFeature=+oneb]
+\begin{document}
+1234567890
+\end{document}
+\end{Verbatim}
+\hrule
+\end{figure}
+
+
+
+