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There is really only one major purpose: To make HTML code more tidy and clear. (Of course this has other positive consequences such as easier teamwork and so on, but I would not call those the purpose of using CSS.)

This is achieved by moving information about appearance into the style attribute and then exporting all styles into separate files, Cascading Style Sheets.

It is possible to define style properties affecting the whole document, groups of elements or only single elements.

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13y ago

What else can I help you with?