They say that in some contexts you have the same background color and foreground color. An example from your CSS (some declarations are omitted for clarity):
#red_module_top {
background: url(http://www.gamefriction.com/Coded/images/red_content_top.jpg) no-repeat;
color: #fff;
}
, color: #fff. , . . , - , ( , , ), .
, . :
background:
, , , .