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efaq: New in Emacs 21

 
 4.7 What is different about Emacs 21?
 =====================================
 
 Emacs 21 features a thorough rewrite of the display engine.  The new
 display engine supports variable-size fonts, images, and can play sounds
 on platforms which support that.  As a result, the visual appearance of
 Emacs, when it runs on a windowed display, is much more reminiscent of
 modern GUI programs, and includes 3D widgets (used for the mode line and
 the scroll bars), a configurable and extensible toolbar, tooltips
 (a.k.a. balloon help), and other niceties.
 
    In addition, Emacs 21 supports faces on text-only terminals.  This
 means that you can now have colors when you run Emacs on a GNU/Linux
 console and on ‘xterm’ with ‘emacs -nw’.
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