What is CSS?

Cascading Style Sheets (CSS) is a style sheet language used for describing the look and formatting of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can also be applied to any kind of XML document, including plain XML, SVG and XUL.

CSS is designed primarily to enable the separation of document content written in HTML or a similar markup language from presentations, including elements such as the layout, colors, and fonts. This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple pages to share formatting, and reduce complexity and repetition in the structural content.

Cascading-Style-Sheets-1

Prior to CSS, nearly all of the presentational attributes of HTML documents were contained within the HTML markup; all font colors, background styles, element alignments, borders and sizes had to be explicitly described, often repeatedly, within the HTML. CSS allows authors to move much of that information to another file, the style sheet, resulting in considerably simpler HTML.

 

 

 

http://www.w3.org/wiki/CSS/Training/What_is_CSS

https://en.wikipedia.org/wiki/Cascading_Style_Sheets

http://www.wolf21.com/blog/cascading-style-sheets-way-to-keep-website-looking-best/

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