Compares the window instance (the first part of WM_CLASS)
window_role::
Compares the window role (WM_WINDOW_ROLE).
+window_type::
+ Compare the window type (_NET_WM_WINDOW_TYPE). Possible values are
+ +normal+, +dialog+, +utility+, +toolbar+, +splash+, +menu+, +dropdown_menu+,
+ +popup_menu+ and +toolti+.
id::
Compares the X11 window ID, which you can get via +xwininfo+ for example.
title::