Variable: show-trailing-whitespace

show-trailing-whitespace is a customizable and buffer-local variable defined in xdisp.c.

Documentation

Non-nil means highlight trailing whitespace.

The face used for trailing whitespace is trailing-whitespace.

View in manual

Probably introduced at or before Emacs version 21.1.

Source Code

// Defined in /usr/src/emacs/src/xdisp.c
  DEFVAR_LISP ("show-trailing-whitespace", Vshow_trailing_whitespace,
    doc: /* Non-nil means highlight trailing whitespace.
The face used for trailing whitespace is `trailing-whitespace'.  */);