Webmaster in a Nutshell, Third Edition

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 ...