The background property is a shorthand property for setting the individual background properties (i.e., '', '', '', '' and '') at the same place in the style sheet.

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The pseudo-class :lang(C) represents an element that is in language C.

If the document language specifies how the human language of an element is determined, it is possible to write selectors that represent an element based on its language.

See also: Language Subtag Registry ]]> :first-letter pseudo-element must select the first letter of the first line of a block, if it is not preceded by any other content (such as images or inline tables) on its line.]]> The :first-line pseudo-element applies special styles to the contents of the first formatted line of a paragraph.

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The :hover pseudo-class applies while the user designates an element with a pointing device, but does not necessarily activate it. Typically, a browser applies this pseudo-class when the mouse pointer hovers over a box generated by the element.

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The :focus pseudo-class applies while an element has the focus, i.e. accepts keyboard or mouse events, or other forms of input.

In an HTML document, an element must receive focus from the user in order to become active and perform its tasks. For example, users must set input focus on a link in order to follow it. Similarly, users must give a textarea focus in order to enter text into it.

There are several ways to give focus to an element:

Designate the element with a pointing device. Even elements that do not typically accept input, such as div and body elements, receive focus when clicked with the mouse.
Navigate through the document with the TAB and Shift+TAB keys. The document’s author may define a tabbing order that specifies the order in which elements will receive focus with the tabindex attribute.
Select an element through a keyboard shortcut.

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