Blizzard still believe they have (may have) actual World Bosses, from TargetFrame.lua
Lua Code:
elseif ( classification == "minus" ) then
self.borderTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Minus");
self.nameBackground:Hide();
self.manabar.pauseUpdates = true;
self.manabar:Hide();
self.manabar.TextString:Hide();
self.manabar.LeftText:Hide();
self.manabar.RightText:Hide();
forceNormalTexture = true;
elseif ( classification == "worldboss" or classification == "elite" ) then
self.borderTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Elite");
elseif ( classification == "rareelite" ) then
self.borderTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Rare-Elite");
elseif ( classification == "rare" ) then
self.borderTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Rare");
else
self.borderTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame");
forceNormalTexture = true;
end