W3C CSS2 Cascading Style Sheets, level 2 - instructional media + ...

Values outside the device gamut should be clipped: the red, green, and blue
values must be changed to fall within the range supported by the device. For a
typical CRT monitor, whose device gamut is the same as sRGB, the three rules
below are equivalent:
Example(s):
EM { color: rgb(255,0,0) } /* integer range 0 - 255 */
EM { color: rgb(300,0,0) } /* clipped to rgb(255,0,0) */
EM { color: rgb(255,-10,0) } /* clipped to rgb(255,0,0) */
EM { color: rgb(110%, 0%, 0%) } /* clipped to rgb(100%,0%,0%) */
Other devices, such as printers, have different gamuts to sRGB; some colors
outside the 0..255 sRGB range will be representable (inside the device gamut),
while other colors inside the 0..255 sRGB range will be outside the device gamut
and will thus be clipped.
Note. Although colors can add significant amounts of information to document
and make them more readable, please consider that certain color combinations
may cause problems for users with color blindness. If you use a background
image or set the background color, please adjust foreground colors accordingly.
4.3.7 Angles
Angle values (denoted by in the text) are used with aural style sheets
[p. 277] .
Their format is an optional sign character (’+’ or ’-’, with ’+’ being the default)
immediately followed by a immediately followed by an angle unit identifier.
Angle unit identifiers are:
deg: degrees
grad: grads
rad: radians
Angle values may be negative. They should be normalized to the range
0-360deg by the user agent. For example, -10deg and 350deg are equivalent.
For example, a right angle is ’90deg’ or ’100grad’ or ’1.570796326794897rad’.
4.3.8 Times
Time values (denoted by in the text) are used with aural style sheets
[p. 277] .
Their format is a immediately followed by a time unit identifier.
Time unit identifiers are:
ms: milliseconds
s: seconds
Time values may not be negative.
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