5.44 How do I turn on syntax highlighting?
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`font-lock-mode' is the standard way to have Emacs perform syntax
highlighting in the current buffer. With `font-lock-mode' turned on,
different types of text will appear in different colors. For instance,
if you turn on `font-lock-mode' in a programming mode, variables will
appear in one face, keywords in a second, and comments in a third.