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As with any object-based coding method, the purpose of OOCSS is to encourage code reuse and,
ultimately, faster and more efficient stylesheets that are easier to add to and maintain.
As described on the OOCSS GitHub repo’s Wiki page, OOCSS is based on two main principles.
for details visit here :-
https://www.smashingmagazine.com/2011/12/an-introduction-to-object-oriented-css-oocss/