Variable: header-line-format

header-line-format is a buffer-local variable defined in buffer.c.

Documentation

Analogous to mode-line-format, but controls the header line.

The header line appears, optionally, at the top of a window; the mode line appears at the bottom.

Probably introduced at or before Emacs version 21.1.

Source Code

// Defined in /usr/src/emacs/src/buffer.c
  DEFVAR_PER_BUFFER ("header-line-format",
		     &BVAR (current_buffer, header_line_format),
		     Qnil,
		     doc: /* Analogous to `mode-line-format', but controls the header line.
The header line appears, optionally, at the top of a window;
the mode line appears at the bottom.  */);