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A window can have a header line at the top, just as it can have
a mode line at the bottom. The header line feature works just like the
mode line feature, except that it's controlled by
header-line-format:
This variable, local in every buffer, specifies how to display the header line, for windows displaying the buffer. The format of the value is the same as for
mode-line-format(see Mode Line Data). It is normallynil, so that ordinary buffers have no header line.
This function returns the height in pixels of window's header line. window must be a live window, and defaults to the selected window.
A window that is just one line tall never displays a header line. A window that is two lines tall cannot display both a mode line and a header line at once; if it has a mode line, then it does not display a header line.