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It is use for describing the presentation of a document written in a markup language. For example in Facebook, we have seen how many different sections are there on their login page. To show that sections, CSS is used.
Mostly, CSS used to set the visual style of web pages and user interfaces written in HTML and XHTML. CSS was introduced in DEC 17, 1996. At that time, it has properties like: fonts, color of text, backgrounds, text attributes, alignment, images, tables etc. After that, CSS 2 was updated in May’98; which offered absolute, relative and fixed positioning, z-index, bidirectional text, and new font properties such as shadows.
CSS3 is latest version in which we will see what new properties of it are. What was the need to update this when all tasks were done easily in previous versions? Previous versions were not supported on all browsers. CSS3 offer target specific browsers with workarounds. Adoption of new functionality in CSS can be hindered by lack of support in major browsers.
CSS rule-set consists of a selector and a declaration block. Selector means class or elements in HTML, while declaration means properties like color, fonts, background. Declaration block contains one or more declarations separated by semicolons. While, CSS property name and a value, separated by a colon.
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