Variable: mouse-highlight
mouse-highlight is a customizable variable defined in frame.c.
Value
t
Documentation
If non-nil, clickable text is highlighted when mouse is over it.
If the value is an integer, highlighting is shown only after moving the mouse, while keyboard input turns off the highlight even when the mouse is over the clickable text. However, the mouse shape still indicates when the mouse is over clickable text.
This variable was added, or its default value changed, in Emacs 22.1.
Probably introduced at or before Emacs version 22.1.
Source Code
// Defined in /usr/src/emacs/src/frame.c
DEFVAR_LISP ("mouse-highlight", Vmouse_highlight,
doc: /* If non-nil, clickable text is highlighted when mouse is over it.
If the value is an integer, highlighting is shown only after moving the
mouse, while keyboard input turns off the highlight even when the mouse
is over the clickable text. However, the mouse shape still indicates
when the mouse is over clickable text. */);