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DRY-ing Out Your Sass Mixins · An A List Apart Article
alistapart.com/article/dry-ing-out-your-sass-mixins, posted 2014 by peter in conversion css development howto toread webdesign
One of the most powerful features of the CSS preprocessor Sass is the mixin, an abstraction of a common pattern into a semantic and reusable chunk. Think of taking the styles for a button and, instead of needing to remember what all of the properties are, having a selector include the styles for the button instead. The button styles are maintained in a single place, making them easy to update and keep consistent.