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Nice use cases!
Regarding this point:
“IE6 doesn’t handle multiple classes” the nit-picky ( but important ) clarification is that IE6 will not always CASCADE correctly with multiple class selectors if the secondary selectors are shared across multiple contexts.
While shirt.big and shoe.big would be problematic, classes shirt.bigShirt and shoe.bigShoe would work fine in IE6.
IE6 just applies multiple class rules individually ( shirt & bigShirt ) without regard to any multi-class context.