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CSS is designed primarily to enable the separation of document content from
document
presentation, including aspects 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 HTML pages to share formatting by specifying the relevant CSS in a separate .css
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. 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.
Changes to the graphic design of a document (or hundreds of documents) can be applied quickly and
easily, by
editing a few lines in the CSS file they use, rather than by changing markup in the documents.
The CSS specification describes a priority scheme to determine which style rules apply if more than
one rule
matches against a particular element. In this so-called cascade, priorities (or weights) are
calculated and
assigned to rules, so that the results are predictable.
The CSS specifications are maintained by the World Wide Web Consortium (W3C). Internet media type
(MIME
type) text/css is registered for use with CSS by RFC 2318 (March 1998). The W3C operates a free CSS
validation service for CSS documents