Emacs/docs/latest/emacs/File-Variables

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49.2.4 Local Variables in Files

A file can specify local variable values to use when editing the file with Emacs. Visiting the file or setting a major mode checks for local variable specifications; it automatically makes these variables local to the buffer, and sets them to the values specified in the file.

File local variables override directory local variables (see Directory Variables), if any are specified for a file’s directory.

• Specifying File Variables		Specifying file local variables.
• Safe File Variables		Making sure file local variables are safe.