Variable: tool-bar-button-relief
tool-bar-button-relief is a variable defined in xdisp.c.
Value
1
Documentation
Relief thickness of tool-bar buttons.
Probably introduced at or before Emacs version 21.1.
Source Code
// Defined in /usr/src/emacs/src/xdisp.c
DEFVAR_INT ("tool-bar-button-relief", tool_bar_button_relief,
doc: /* Relief thickness of tool-bar buttons. */);