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Cascading Style Sheets supports cascading style sheets (or CSS). Cascading Style Sheets allows an web author/publisher to separate the web page content from the web page format. HTML tags are used to define the structure of the page, but the style sheet(s) defines the appearance of the different HTML elements. With CSS, you can add color, positioning, and special effects not available with standard HTML.

This separation of content from appearance has many benefits. Web authors/publishers do not have to concern themselves with appearance options. The layout and formatting rules can be contained in a single document that take precedence over the entire web site. Pages that use CSS are easy to maintain and change. Changing a single rule will impact all of the occurrences of the HTML elements that uses that particular style.

The W3C suggests the use of CSS in HTML 4.0 and discourages the use of attributes within HTML tags by deprecating these appearance elements. CSS makes HTML pages less cumbersome for browsers by eliminating the appearance from HTML tags. This enhances web pages accessibility for the international community, as well as accessibility for people with disabilities.

A web site resource that reviews the various browsers and their compatibility to CSS can be found here.

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