The actual value of a CSS property is the used value after all approximations have been applied. For example, a user agent may only be able to render borders with a integer pixel value and may be forced to approximate the computed width of the border.
Specification | Status | Comment |
---|---|---|
CSS Level 2 (Revision 1) The definition of 'actual value' in that specification. | Recommendation | Initial definition |
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https://developer.mozilla.org/en-US/docs/Web/CSS/actual_value