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CSS is designed to enable the separation of presentation and content, including layout, colors, and fonts.
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CSS has rules for alternate formatting if the content is accessed on a mobile device.
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CSS specifications are maintained by the World Wide Web Consortium .
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CSS has a simple syntax and uses a number of English keywords to specify the names of various style properties.
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In CSS, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself.
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CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.
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CSS can define color, font, text alignment, size, borders, spacing, layout and many other typographic characteristics, and can do so independently for on-screen and printed views.
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CSS defines non-visual styles, such as reading speed and emphasis for aural text readers.
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One of the goals of CSS is to allow users greater control over presentation.
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Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate.
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Inheritance in CSS is not the same as inheritance in class-based programming languages, where it is possible to define class B as "like class A, but with modifications".
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CSS was first proposed by Hakon Wium Lie on 10 October 1994.
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In 2005, the CSS Working Groups decided to enforce the requirements for standards more strictly.
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However, even when later "version 5" web browsers began to offer a fairly full implementation of CSS, they were still incorrect in certain areas and were fraught with inconsistencies, bugs and other quirks.
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CSS Working Group sometimes publishes "Snapshots", a collection of whole modules and parts of other drafts that are considered stable enough to be implemented by browser developers.
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Adoption of new functionality in CSS can be hindered by lack of support in major browsers.
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Additionally, the CSS 3 defines feature queries, which provide an @supports directive that will allow developers to target browsers with support for certain functionality directly within their CSS.
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CSS frameworks are pre-prepared libraries that are meant to allow for easier, more standards-compliant styling of web pages using the Cascading Style Sheets language.
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