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initial value

The initial value of a CSS property is its default value, as listed in its definition table. The usage of the initial value depends on whether a property is inherited or not:

Note: You can explicitly specify the initial value by using the initial keyword.

Specifications

Specification Status Comment
CSS Cascade 4 Formal definition.
CSS Level 2 (Revision 1)
The definition of 'initial value' in that specification.
Recommendation Implicit definition.

See also

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