As long as I can remember, http://trac.adium.im/wiki/CreatingMessageStyles has contained:
DefaultBackgroundColor is the hex value of the background color. This does not actually affect your style but DOES display in the preferences window; properly setting it improves the user experience by having the default color they see match the default color of the background color colorwell. This can be done on a per-variant basis (see note below). If you do not include DefaultBackgroundColor then the background color is assumed to be white (FFFFFF). I don't think this actually exists in Adium right now, and I don't recall ever seeing it work in a message style. Does anyone know if it used to work? At this point I'm inclined to close the relevant ticket (http://trac.adium.im/ticket/10478) and remove references to DefaultBackgroundColor from the wiki. Similarly, I suspect the following info from the wiki is vaporware: Per-variant keys may be created by appending ":VARIANTNAME" to the key. For example, to set a default background color for your variant "Black Version.css", which would display as "Black Version" in the menu, you set the key {{{DefaultBackgroundColor:Black Version}}} to the color (perhaps 000000) as a string. When looking for the settings for a variant, the variant-specific version is tried first. If none is found, the general style setting is tried. If no general setting is found, the default value is used. This functionality sounds like it could be pretty useful, but I'll probably just remove this from the wiki unless someone is actually interested in coding it. If you are, just let me know and I'll move this text from the wiki to a ticket. FWIW, there's already at least one precedent for this sort of documented but missing functionality: http://trac.adium.im/ticket/10480. -- Matthew