Cascading Style
Sheets (CSS) is a style
sheet language used
for describing the look
and formatting of
a document written in a markup
language. While
most often used to style web
pages and interfaces written
in HTML and XHTML,
the language can 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
from document presentation, including elements
such as the layout, colors,
and fonts.[1] 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 (such as by allowing for tableless
web design).
CSS can also allow the same
markup page to be presented in different styles
for different rendering methods, such as
on-screen, in print, by voice (when read out by
a speech-based browser or screen
reader) and on Braille-based,
tactile devices. It can also be used to allow
the web page to display differently depending on
the screen size or device on which it is being
viewed. While the author of a document typically
links that document to a CSS file, readers can
use a different style sheet, perhaps one on
their own computer, to override the one the
author has specified. However if the author or
the reader did not link the document to a
specific style sheet the default style of the
browser will be applied.
CSS specifies a priority scheme to determine
which style rules apply if more than one rule
matches against a particular element. In this
so-calledcascade, 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), and they also operate a free CSS
validation servicee.
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Tricia Magsino [email protected] |