HTML and CSS Reference
Time units are used only with CSS3 properties. There are just two units, as shown in Table 3-4 .
Table 3-4. Time Units in CSS3
Milliseconds (1/1,000 of a second)
Again, there must be no space between the number and the unit.
■ When specifying a zero value for an angle or time, you must include the unit of measurement, for
example, 0deg , 0s . The only time you can omit the unit after zero is with lengths and percentages.
Setting Color Values
CSS offers the following options for setting color values:
RGB (red, green, blue) format
HSL (hue, saturation, lightness) format (CSS3)
RGBA (red, green, blue with alpha transparency) format (CSS3)
HSLA (hue, saturation, lightness with alpha transparency) format (CSS3)
CSS3 defines the 16 basic color keywords shown in Figure 3-3 . The names are case-insensitive.