rgb ( 255, 0, 0 )), RGBA values that specify both color and alpha transparency (e.g. # FF0000, also abbreviated as # F00), RGB values on a 0 to 255 scale (e.g. 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 parent element's width).Ĭolor values can be specified with keywords (e.g. Some properties can affect any type of element, and others apply only to particular groups of elements. Each property has a set of possible values. Properties are specified in the CSS standard. Optional white-space may be around the declaration block, declarations, colons, and semi-colons for readability. Declaration Įach declaration itself consists of a property, a colon ( :), and a value. m圜lass ) enclosing a semicolon-separated list of declarations. Multiple simple selectors may be joined using combinators to specify elements by location, element type, id, class, or any combination thereof. Note the distinction between the double-colon notation used for pseudo-elements and the single-colon notation used for pseudo-classes. It is appended to a selector as in a : hover or # elementid : hover.Ī pseudo-class classifies document elements, such as : link or : visited, whereas a pseudo-element makes a selection that may consist of partial elements, such as :: first-line or :: first-letter. One example of a widely used pseudo-class is : hover, which identifies content only when the user "points to" the visible element, usually by holding the mouse cursor over it. Pseudo-classes are used in CSS selectors to permit formatting based on information that is not contained in the document tree. An ID may only be applied to a single element. A class may apply to any number of instances of any element.
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