The answer is Yes. Bootstrap uses a lot of CSS3 selectors, and there's a good reason by using each class separated by "-" as you mentioned.
[class*="btn-"] takes the same attributes for all kinds of btn (btn-info, btn-danger, btn-success) and you don't need to call 2 classes like foundation did.
And speaking about perfomance, the less you call, the more you get.
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The answer is Yes. Bootstrap uses a lot of CSS3 selectors, and there's a good reason by using each class separated by "-" as you mentioned.
[class*="btn-"] takes the same attributes for all kinds of btn (btn-info, btn-danger, btn-success) and you don't need to call 2 classes like foundation did.
And speaking about perfomance, the less you call, the more you get.