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CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.
CSS also defines non-visual styles, such as reading speed and emphasis for aural text readers.
Descendant elements may inherit CSS property values from any ancestor element enclosing them.
In general, descendant elements inherit text-related properties, but box-related properties are not inherited.
Selectors may apply to: Classes and IDs are case-sensitive, start with letters, and can include alphanumeric characters and underscores.
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.
Declarations not set in the highest priority source are passed on to a source of lower priority, such as the user agent style. One of the goals of CSS is to allow users greater control over presentation.