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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.
The W3C has now deprecated the use of all presentational HTML markup.
The advantages of this may not be immediately clear (since the second form is actually more verbose), but the power of CSS becomes more apparent when the style properties are placed in an internal style element or, even better, an external CSS file.
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.
One example of a widely used pseudo-class is Values may be keywords, such as "center" or "inherit", or numerical values, such as 200px (200 pixels), 50vw (50 percent of the viewport width) or 80% (80 percent of the window width). Before CSS, nearly all presentational attributes of HTML documents were contained within the HTML markup.
All font colors, background styles, element alignments, borders and sizes had to be explicitly described, often repeatedly, within the HTML.
Along with HTML and Java Script, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.This made documents more complex, larger, and more error-prone and difficult to maintain.CSS allows the separation of presentation from structure.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.