If I use a widget of yours I would be totally fine with it if your widget 
has two or more css classes applied to define its look and feel/position. 
If I want to overwrite your css I would add an additional css class of my 
own CssResource to your widget or I would reference your widget through my 
parent container, e.g. .myContainer .yourWidget { ... }, if possible.
In the first case I just have to make sure that my css class will be 
defined after your widget's css class so that my css rules have a higher 
priority than yours (or use !important). In the second case .myContainer 
.yourWidget automatically has a higher priority because its more specific. 
In both cases I don't care if your widget has one or more classes applied 
out of the box.

So you would create a SharedClientBundle/CssResource that you can inject 
once and that your widgets depend on. I think you could even keep it 
private so only your widgets can access/use it.

I don't really see why a widget should only have a single css class. But 
its late.. maybe I am missing something :-)

Basic example: http://jsfiddle.net/2vJ2C/

-- J.

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