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Re:The CSS selector length myth by benlinton on Friday May 24, 2013 @10:49AM (#5763127)
While we probably shouldn't worry about long CSS selectors due to performance issues, we should avoid them for other reasons.

For instance, because it's considered a best practice to avoid "Modifying Components Based On Who Their Parents Are". Please see this article: http://engineering.appfolio.com/2012/11/16/css-architecture/