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Object oriented css (OOCSS) is an approach to writing html and css that allows us to answer yes to each of these questions.
CSS is not an object oriented language and the programmer in you might be cringing at the name.

A css object is any repeating visual pattern, which can be abstracted into a snippet of html, css, and sometimes java script. These visual patterns become objects or modules through css classes that can be reused throughout a project or projects.

The goal of Object Oriented CSS is to encourage code reuse for faster and more efficient stylesheets that are easier to maintain. OOCSS is a also framework developed by Nicole Sullivan based on 2 main principles

Separate structure and skin
Separate container and content
http://www.vanseodesign.com/css/object-oriented-css/