Onze vrijwilligers hebben dit artikel nog niet naar het Nederlands vertaald. Doe mee en help de klus te klaren!
The computed value of a CSS property is computed from the specified value by:
- Handling the special values
inherit
andinitial
, and - Doing the computation needed to reach the value described in the "Computed value" line in the property's summary.
The computation needed to reach the computed value for the property typically involves converting relative values (such as those in em
units or percentages) to absolute values.
For example, if an element has specified values font-size: 16px
and padding-top: 2em
, then the computed value of padding-top
is 32px
(double the font size).
However, for some properties (those where percentages are relative to something that may require layout to determine, such as width
, margin-right
, text-indent
, and top
), percentage specified values turn into percentage computed values. Additionally, unitless numbers specified on the line-height
property become the computed value, as specified. These relative values that remain in the computed value become absolute when the used value is determined.
The main use of the computed value (other than as a step between the specified value and used value) is inheritance, including the inherit
keyword.
Notes
The getComputedStyle()
DOM API returns the resolved value
, which may either be the computed value
or the used value
, depending on the property.
Specifications
Specification | Status | Comment |
---|---|---|
CSS Level 2 (Revision 1) The definition of 'computed value' in that specification. |
Recommendation | Initial specification |
See also
- CSS Reference
- CSS Key Concepts: CSS syntax, at-rule, comments, specificity and inheritance, the box, layout modes and visual formatting models, and margin collapsing, or the initial, computed, resolved, specified, used, and actual values. Definitions of value syntax, shorthand properties and replaced elements.