Style sheets influence the presentation of documents by assigning values to style properties. This section lists the defined style properties, and their corresponding list of possible values, of CSS1.
In the text below, the allowed values for each property are listed with a syntax like the following:
Value: N | NW | NE
Value: [ <length> | thick | thin ]{1,4}
Value: [<family-name> , ]* <family-name>
Value: <url>? <color> [ / <color> ]?
Value: <url> || <color>
The words between "<" and ">" give a type of value. The most common types are <length>, <percentage>, <url>, <number> and <color>. The more specialized types (e.g. <font-family> and <border-style>) are described under the corresponding property.
Other words are keywords that must appear literally, without quotes. The slash (/) and the comma (,) must also appear literally.
Several things juxtaposed mean that all of them must occur, in the given order. A bar (|) separates alternatives: one of them must occur. A double bar (A || B) means that either A or B or both must occur, in any order. Brackets ([]) are for grouping. Juxtaposition is stronger than the double bar, and the double bar is stronger than the bar. Thus "a b | c || d e" is equivalent to "[ a b ] | [ c || [ d e ]]".
Every type, keyword, or bracketed group may be followed by one of the following modifiers: