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actual value

The actual value of a CSS property is the used value of that property after any necessary approximations have been applied. For example, a user agent that can only render borders with a whole-number pixel width may round the thickness of the border to the nearest integer.

Specifications

Specification Status Comment
CSS Level 2 (Revision 1)
The definition of 'actual value' in that specification.
Recommendation Initial definition

See also

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https://developer.mozilla.org/en-US/docs/Web/CSS/actual_value