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For example, suppose the document contains the style element: This further decouples the styling from the HTML document, and makes it possible to restyle multiple documents by simply editing a shared external CSS file.CSS information can be provided from various sources.Internet media type (MIME type) CSS has a simple syntax and uses a number of English keywords to specify the names of various style properties. Each rule or rule-set consists of one or more selectors, and a declaration block.In CSS, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself.Properties that can be inherited are color, font, letter-spacing, line-height, list-style, text-align, text-indent, text-transform, visibility, white-space and word-spacing.Properties that cannot be inherited are background, border, display, float and clear, height, and width, margin, min- and max-height and -width, outline, overflow, padding, position, text-decoration, vertical-align and z-index.This made documents more complex, larger, and more error-prone and difficult to maintain.CSS allows the separation of presentation from structure.
The information from the author can be further classified into inline, media type, importance, selector specificity, rule order, inheritance and property definition.CSS also has rules for alternate formatting if the content is accessed on a mobile device.The name cascading comes from the specified priority scheme to determine which style rule applies if more than one rule matches a particular element. The CSS specifications are maintained by the World Wide Web Consortium (W3C).CSS style information can be in a separate document or it can be embedded into an HTML document. Different styles can be applied depending on the output device being used; for example, the screen version can be quite different from the printed version, so that authors can tailor the presentation appropriately for each medium.The style sheet with the highest priority controls the content display.