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(emacs)Trailing Whitespace

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Trailing Whitespace
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   It is easy to leave unnecessary spaces at the end of a line without
realizing it.  In most cases, this "trailing whitespace" has no effect,
but there are special circumstances where it matters.

   You can make trailing whitespace visible on the screen by setting the
buffer-local variable `show-trailing-whitespace' to `t'.  Then Emacs
displays trailing whitespace in the face `trailing-whitespace'.

   Trailing whitespace is defined as spaces or tabs at the end of a
line.  But trailing whitespace is not displayed specially if point is
at the end of the line containing the whitespace.  (Doing that looks
ugly while you are typing in new text, and the location of point is
enough in that case to show you that the spaces are present.)

   To delete all trailing whitespace within the current buffer's
restriction (Note: Narrowing), type `M-x delete-trailing-whitespace
<RET>'.  (This command does not remove the form-feed characters.)

   Emacs can indicate empty lines at the end of the buffer with a
special bitmap on the left fringe of the window.  To enable this
feature, set the buffer-local variable `indicate-empty-lines' to a
non-`nil' value.  The default value of this variable is controlled by
the variable `default-indicate-empty-lines'; by setting that variable,
you can enable or disable this feature for all new buffers.