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Units of Measure
Throughout this CSS reference guide, abstract values (notably values involving units of measure) appear between angle brackets: <color>. They should be replaced by actual values as indicated in the key below.
Length Units
<length> indicates a number followed by a unit of measure: 24px.
The number can be an integer or a decimal fraction, and can be preceded by + or -.
Units can be absolute or relative:
Absolute: mm, cm, in, pt, pc (millimeters, centimeters, inches, points, picas)
Relative: em, ex, px (the element's font height, the element's x-height, pixels)
Font size may be defined in points, pixels, inches, or centimeters (pt, px, in, cm) or as a percentage.
<absolute-size> can be: xx-small, x-small, small, medium, large, x-large, xx-large.
<relative-size> can be: larger, smaller.
Percentage Units
<percentage> indicates a number followed by a % sign: 50%.
In the text-indent, margin, padding, and width properties, percentage values are relative to the width of the parent element.
In the font-size property, percentage values are relative to the font size of the parent element.
In <color> values, percentages can be used to express RGB values.
Color Units
<color> can represent either <color-name> or <rgb> values, as defined below:
<color-name> can be: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, yellow
<rgb> can be:
#<hex><hex><hex>
rgb(<number>, <number>, <number>)
rgb(<percentage>,<percentage>,<percentage>)
<hex> represents a hexidecimal value, <number> a decimal value, and <percentage> a percentage.
- What Is CSS?
- How CSS Works
- Linking Stylesheets
- CSS-P (Position)
- Attributes
- CSS Properties
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