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CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.For example, headings (), etc., are defined structurally using HTML.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.This made documents more complex, larger, and more error-prone and difficult to maintain.CSS allows the separation of presentation from structure.This separation can improve content accessibility, provide more flexibility and control in the specification of presentation characteristics, enable multiple HTML pages to share formatting by specifying the relevant CSS in a separate file, and reduce complexity and repetition in the structural content.
A class may apply to any number of instances of any elements. Pseudo-classes are used in CSS selectors to permit formatting based on information that is not contained in the document tree. #FF0000, also abbreviated as #F00), RGB values on a 0 to 255 scale (e.g.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.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.