OpenType Feature File (.fea)
OpenType features are tedious to define using a GUI. Consequently, Adobe standardized a text specification format for feature files, which typically have a name ending in a .fea extension. These files can be compiled into the binary font container (.ttf or .otf) using Adobe FDK (AFDKO), FontLab or FontForge. The latter program implements a few features that are documented in the Adobe standard but are not implemented by AFDKO.
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—Richard Brinsley Sheridan (1751–1816)
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—Henry David Thoreau (1817–1862)