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One example of a widely used pseudo-class is Values may be keywords, such as "center" or "inherit", or numerical values, such as 200px (200 pixels), 50vw (50 percent of the viewport width) or 80% (80 percent of the window width). Before CSS, nearly all 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.
Although most often used to set the visual style of web pages and user interfaces written in HTML and XHTML, the language can be applied to any XML document, including plain XML, SVG and XUL, and is applicable to rendering in speech, or on other media.
Along with HTML and Java Script, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.
It can also display the web page differently depending on the screen size or viewing device.
Readers can also specify a different style sheet, such as a CSS file stored on their own computer, to override the one the author specified.
CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.
For example, headings (), etc., are defined structurally using HTML.
The CSS specifications are maintained by the World Wide Web Consortium (W3C).These sources can be the web browser, the user and the author.The information from the author can be further classified into inline, media type, importance, selector specificity, rule order, inheritance and property definition.This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple HTML pages to share formatting by specifying the relevant CSS in a separate file, and reduce complexity and repetition in the structural content.Separation of formatting and content makes it possible to present the same markup page in different styles for different rendering methods, such as on-screen, in print, by voice (via speech-based browser or screen reader), and on Braille-based tactile devices.