can configure mouse bindings in a similar way to key bindings.
*Syntax*:
--------------------------------------------------------------------------------
-bindsym [--release] [--border] [--whole-window] [<Modifiers>+]button<n> command
--------------------------------------------------------------------------------
+----------------------------------------------------------------------------------------------------
+bindsym [--release] [--border] [--whole-window] [--exclude-titlebar] [<Modifiers>+]button<n> command
+----------------------------------------------------------------------------------------------------
By default, the binding will only run when you click on the titlebar of the
window. If the +--release+ flag is given, it will run when the mouse button
of the window is clicked, with the exception of the border. To have a bind run
when the border is clicked, specify the +--border+ flag.
+If the +--exclude-titlebar+ flag is given, the titlebar will not be considered
+for the keybinding.
+
*Examples*:
--------------------------------
# The middle button over a titlebar kills the window