With style sheets, you can use numeric values to set style properties in multiple ways:
absolutely, meaning in units which are independent of the form of output (such as in centimetres);
relatively, meaning in units relative to an element.
Style sheet values may be given either in integers or in real numbers (digits with an integer part and a decimal part).
These values can, in some cases, be negative (preceded with a minus sign "-"). However, some properties have upper and lower limits to the values they can take.
Absolute units
The absolute units offered by the CSS standard are summarised in this chart:
unit
description
cm
centimetres
in
inches (1 inch = 2.54 cm)
mm
millimetres
pt
points
pc
picas (1 pica = 12 pt)
Relative units
The relative units offered by the CSS standard are summarised in this chart:
unit
description
em
Relative to the font size of the indicated element. Sole exception to this rule: when the property font-size is defined, it is relative to the font size of the parent element.
ex
Relative to the lowercase letter height of the indicated element. Sole exception to this rule: when the property font-size is defined, it is relative to the lowercase letter height of the parent element.
px
The pixel. This is a unit which may be rendered differently depending on the screen resolution of the user's monitor.
%
The percentage is a unit which is relative to the size of the element or its parent.
Last update on Thursday October 16, 2008 02:43:13 PM.This document entitled « Units in style sheets (CSS) » from Kioskea (en.kioskea.net) is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the licence, as this note appears clearly.
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