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CSS guidelines
http://csswizardry.com/2015/03/more-transparent-ui-code-with-namespaces/ 
http://csswizardry.com/2013/01/mindbemding-getting-your-head-round-bem-syntax/ 
http://csswizardry.com/2015/03/immutable-css/ 
http://www.smashingmagazine.com/2015/03/05/automating-style-guide-driven-development/ 
http://warpspire.com/kss/ 
http://cssguidelin.es/ 
https://smacss.com/book/ 
http://alistapart.com/article/axiomatic-css-and-lobotomized-owls