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9.4. CSS Reference
The remainder of this chapter lists all the properties defined in the World Wide Web Consortium's Recommended Specification for Cascading Style Sheets, Level 1 (http://www.w3.org/pub/WWW/TR/REC-CSS1). All browsers do not implement all properties fully, and some simply do not work correctly. As in the HTML reference, we use the Netscape and Internet Explorer icons to show which browser supports that property. Properties with no icons are not currently supported by these browsers.
The following list includes each property's possible values, defined as either an explicit keyword (shown in constant width) or as one of these values:
- color
-
Either a color name or hexadecimal RGB value, as defined in Chapter 8, or an RGB triple of the form:
rgb(red, green, blue)
where red, green, and blue are either numbers in the range 0 to 255 or percentage values indicating the brightness of that color component. Values of 255 or 100% indicate that the corresponding color component is at its brightest; values of 0 or 0% indicate that the corresponding color component is turned off completely. For example:
rgb(27, 119, 207) rgb(50%, 75%, 0%)
are both valid color specifications.
- length
- An optional sign (either + or -), immediately followed by a number (with or without a decimal point) immediately followed by a two-character unit identifier. For values of zero, the unit identifier may be omitted. The unit identifiers em and ex refer to the overall height of the font and to the height of the letter "x", respectively. The unit identifier px is equal to a single pixel on the display device. The unit identifiers in, cm, mm, pt, and pc refer to inches, centimeters, millimeters, points, and picas, respectively. There are 72.27 points per inch and 12 points in a pica.
- number
- An optional sign, immediately followed by a number (with or without a decimal point).
- percent
- An optional sign, immediately followed by a number (with or without a decimal point), immediately followed by a percent sign. The actual value is computed as a percentage of some other element property, usually the element's size.
- url
-
The keyword url, immediately followed (no spaces)
by a left parenthesis, followed by a URL optionally enclosed in
single or double quotes, followed by a matching right parenthesis.
This is a valid URL, for example:
url("http://members.aol.com/htmlguru")
Finally, some values are lists of other values and are described as a "list of" some other value. In these cases, a list consists of one or more of the allowed values, separated by commas. The standard defines a default value for most properties. The default property is listed in the top syntax line for the property. Additional allowed values are listed beneath each description.
| background |
background:list
Composite property for the background-attachment, background-color, background-image, background-position, and background-repeat properties; list is any of these properties' values, in any order.
| background-attachment |
background-attachment: scroll
Determines if the background image is fixed in the window or scrolls as the document scrolls. Accepted values: fixed, scroll
| background-color |
background-color: transparent
Sets the background color of an element. Accepted values: color, transparent.
| background-image |
background-image: none
Sets the background image of an element. Accepted values: url, transparent.
| background-position |
background-position: percent
Sets the initial position of the element's background image, if specified; values are normally paired to provide x, y positions. Default position is 0% 0%. Accepted values: length, percent, top, center, bottom, left, right.
| background-repeat |
background-repeat: repeat
Determines how the background image is repeated (tiled) across an element. Accepted values: repeat, repeat-x, repeat-y, no-repeat.
| border |
border: list
Sets all four borders on an element; value is one or more of a color, a value for border-width, and a value for border-style.
| border-bottom |
border-bottom: list
Sets the bottom border on an element; value is one or more of a color, a value for border-bottom-width, and a value for border-style.
| border-bottom-width |
border-bottom-width: medium
Sets the thickness of an element's bottom border. Accepted values: medium, length, thin, thick.
| border-color |
border-color: color
Sets the color of all four of an element's borders; default is the color of the element.
| border-left |
border-left: list
Sets the left border on an element; value is one or more of a color, a value for border-left-width, and a value for border-style.
| border-left-width |
border-left-width: medium
Sets the thickness of an element's left border. Accepted values: length, medium, thin, thick.
| border-right |
border-right: list
Sets the right border on an element; value is one or more of a color, a value for border-right-width, and a value for border-style.
| border-right-width |
border-right-width: medium
Sets the thickness of an element's right border. Accepted values: length, medium, thin, thick.
| border-style |
border-style: none
Sets the style of all four of an element's borders. Accepted values: none, dashed, dotted, double, groove, inset, outset, ridge, solid.
| border-top |
border-top: list
Sets the top border on an element; value is one or more of a color, a value for border-top-width, and a value for border-style.
| border-top-width |
border-top-width: medium
Sets the thickness of an element's top border. Accepted values: length, medium, thin, thick.
| border-width |
border-width: medium
Sets the thickness of all four of an element's borders. Accepted values: length, medium, thin, thick.
| clear |
clear: none
Sets which margins of an element must not be adjacent to a floating element; the element will be moved down until that margin is clear. Accepted values: none, both, left, right.
| display |
display: block
Controls how an element is displayed. Accepted values: block, inline, list-item, none.
| float |
float: none
Determines if an element floats to the left or right, allowing text to wrap around it, or be displayed inline (using none). Accepted values: left, right, none.
| font |
font: list
Sets all the font attributes for an element; value is any of the values for font-style, font-variant, font-weight, font-size, line-height, and font-family, in that order.
| font-family |
font-family: list of font names
Defines the font for an element, either as a specific font or as one of the generic fonts serif, sans-serif, cursive, fantasy, or monospace.
| font-size |
font-size: size
Defines the font size. Accepted values: length, percent, xx-small, x-small, small, medium, large, x-large, xx-large, larger, smaller.
| font-style |
font-style: normal
Defines the style of the face, either normal or some type of slanted style. Accepted values: italic, oblique, normal.
| font-variant |
font-variant: normal
Defines a font to be in small caps. Accepted values: smallcaps, normal.
| font-weight |
font-weight: normal
Defines the font weight. If a number is used, it must be a multiple of 100 between 100 and 900; 400 is normal, 700 is the same as the keyword bold. Accepted values: bold, bolder, lighter, number, normal.
| letter-spacing |
letter-spacing: normal
Inserts additional space between text characters. Accepted values: length, normal.
| line-height |
line-height: normal
Sets the distance between adjacent text baselines. Accepted values: length, number, percent, normal.
| list-style |
list-style: list
Defines list-related styles using any of the values for list-style-image, list-style-position, and list-style-type.
| list-style-image |
list-style-image: none
Defines an image to be used as a list item's marker, in lieu of the value for list-style-type. Accepted values: url, none.
| list-style-position |
list-style-position: outside
Indents or extends (default) a list item's marker with respect to the item's content. Accepted values: inside, outside.
| list-style-type |
list-style-type: disc
Defines a list item's marker for either unordered lists (circle, disc, or square) or ordered lists (the rest). Accepted values: circle, square, decimal, disc, lower-alpha, lower-roman, none, upper-alpha, upper-roman.
| margin |
margin: length
Defines all four of an element's margins. Accepted values: length, percent, auto.
| margin-bottom |
margin-bottom: length
Defines the bottom margin of an element; default value is 0. Accepted values: length, percent, auto.
| margin-left |
margin-left: length
Defines the left margin of an element; default value is 0. Accepted values: length, percent, auto.
| margin-right |
margin-right: length
Defines the right margin of an element; default value is 0. Accepted values: length, percent, auto.
| margin-top |
margin-top: length
Defines the top margin of an element; default value is 0. Accepted values: length, percent, auto.
| padding-bottom |
padding-bottom: length
Defines the bottom padding of an element; default value is 0. Accepted values: length, percent.
| padding-left |
padding-left: length
Defines the left padding of an element; default value is 0. Accepted values: length, percent.
| padding-right |
padding-right: length
Defines the right padding of an element; default value is 0. Accepted values: length, percent.
| padding-top |
padding-top: length
Defines the top padding of an element; default value is 0. Accepted values: length, percent.
| text-align |
text-align: style
Sets the text alignment style for an element. The default value is dependent on the element. Accepted values: center, justify, left, right.
| text-decoration |
text-decoration: none
Defines any decoration for the text; values may be combined.Accepted values: blink, line-through, none, overline, underline.
| text-indent |
text-indent: length
Defines the indentation of the first line of text in an element; default value is 0. Accepted values: length, percent.
| text-transform |
text-transform: none
Transforms the text in the element accordingly. Accepted values: capitalize, lowercase, none, uppercase.
| vertical-align |
vertical-align: position
Sets the vertical positioning of an element. The default setting is dependent on the element. Accepted values: percent, baseline, bottom, middle, sub, super, text-bottom, text-top, top.
| word-spacing |
word-spacing: normal
Inserts additional space between words. Accepted values: length, normal.
| white-space |
white-space: normal
Defines how whitespace within an element is handled. Accepted values: normal, nowrap, pre.
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| 9.3. Style Properties |  | III. XML |
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