February 2010
Intermediate to advanced
352 pages
11h 4m
English
Content preview from HTML & CSS: The Good Parts
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CSS Units
While CSS supports a seemingly endless list of properties, the scheme for setting values is fairly predictable. Table 3-2 describes the most frequently used values.
Table 3-2. Commonly encountered CSS length/size, keyword, and color units
Unit | Type | Example |
|---|---|---|
| length |
|
| length |
|
| length |
|
| length |
|
| length |
|
| length |
|
| font size |
|
| color (decimal) |
|
| color (hexadecimal) |
|
| color (hexadecimal, reduced depth) |
|
Cross-Media Length and Size Units
There are three commonly used units in stylesheets intended for screen display:
px(pixels)Pixels are absolute units, equal to one pixel on the user’s screen display; always expressed as an integer.
em(ems)In digital typesetting environments (including CSS), an em is equivalent to the greatest possible height of a glyph (letter) in the applicable font and size combination. The contemporary definition contrasts with the historical definition: the width of a capital “M” in the font and size of the type to which it is applied as a measurement. This unit is usually expressed with a floating-point value.
%(percent)Percentage units are computed relative to some baseline measurement, which varies according to property and context. Floating-point percentage values are allowed.
em and
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