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At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. The features of GNU Emacs include:
- Content-sensitive editing modes, including syntax coloring, for a variety of file types including plain text, source code, and HTML.
- Complete built-in documentation, including a tutorial for new users.
- Full Unicode support for nearly all scripts.
- Highly customizable, using Emacs Lisp code or a graphical interface.